Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

169 files changed, 27997 insertions, 0 deletions

diff --git a/third_party/libwebrtc/build/config/BUILD.gn b/third_party/libwebrtc/build/config/BUILD.gn
new file mode 100644
index 0000000000..05ae8a8c99
--- /dev/null
+++ b/third_party/libwebrtc/build/config/BUILD.gn
@@ -0,0 +1,391 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/c++/c++.gni")
+import("//build/config/chrome_build.gni")
+import("//build/config/chromecast_build.gni")
+import("//build/config/crypto.gni")
+import("//build/config/dcheck_always_on.gni")
+import("//build/config/features.gni")
+
+# Subprojects need to override arguments in {mac,ios}_sdk_overrides.gni in their
+# .gn config, but those arguments are only used on macOS. Including
+# mac_sdk_overrides.gni insures that this doesn't trigger an unused argument
+# warning.
+import("//build/config/ios/ios_sdk_overrides.gni")
+import("//build/config/mac/mac_sdk_overrides.gni")
+
+import("//build/config/pch.gni")
+import("//build/config/sanitizers/sanitizers.gni")
+import("//build/config/ui.gni")
+import("//build/toolchain/goma.gni")
+if (is_android) {
+  import("//build/config/android/abi.gni")
+}
+
+# ==============================================
+#   PLEASE DO NOT ADD MORE THINGS TO THIS LIST
+# ==============================================
+#
+# Legacy feature defines applied to all targets.
+#
+# These are applied to every single compile in the build and most of them are
+# only relevant to a few files. This bloats command lines and causes
+# unnecessary recompiles when flags are flipped.
+#
+# To pass defines to source code from the build, use the buildflag system which
+# will write headers containing the defines you need. This isolates the define
+# and means its definition can participate in the build graph, only recompiling
+# things when it actually changes.
+#
+# See //build/buildflag_header.gni for instructions on generating headers.
+#
+# This will also allow you to scope your build flag to a BUILD.gn file (or a
+# .gni file if you need it from more than one place) rather than making global
+# flags. See //build/config/BUILDCONFIG.gn for advice on where to define
+# build flags.
+config("feature_flags") {
+  defines = []
+  if (dcheck_always_on) {
+    defines += [ "DCHECK_ALWAYS_ON=1" ]
+    if (dcheck_is_configurable) {
+      defines += [ "DCHECK_IS_CONFIGURABLE" ]
+    }
+  }
+  if (use_udev) {
+    # TODO(brettw) should probably be "=1".
+    defines += [ "USE_UDEV" ]
+  }
+  if (use_aura) {
+    defines += [ "USE_AURA=1" ]
+  }
+  if (use_glib) {
+    defines += [ "USE_GLIB=1" ]
+  }
+  if (use_nss_certs) {
+    defines += [ "USE_NSS_CERTS=1" ]
+  }
+  if (use_ozone && !is_android) {
+    # Note that some Chrome OS builds unconditionally set |use_ozone| to true,
+    # but they also build some targets with the Android toolchain. This ensures
+    # that Android targets still build with USE_OZONE=0 in such cases.
+    #
+    # TODO(crbug.com/837032): Maybe this can be cleaned up if we can avoid
+    # setting use_ozone globally.
+    defines += [ "USE_OZONE=1" ]
+  }
+  if (use_x11) {
+    defines += [ "USE_X11=1" ]
+  }
+  if (is_asan || is_hwasan || is_lsan || is_tsan || is_msan) {
+    defines += [ "MEMORY_TOOL_REPLACES_ALLOCATOR" ]
+  }
+  if (is_asan) {
+    defines += [ "ADDRESS_SANITIZER" ]
+  }
+  if (is_lsan) {
+    defines += [ "LEAK_SANITIZER" ]
+  }
+  if (is_tsan) {
+    defines += [
+      "THREAD_SANITIZER",
+      "DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL=1",
+    ]
+  }
+  if (is_msan) {
+    defines += [ "MEMORY_SANITIZER" ]
+  }
+  if (is_ubsan || is_ubsan_null || is_ubsan_vptr || is_ubsan_security) {
+    defines += [ "UNDEFINED_SANITIZER" ]
+  }
+  if (is_official_build) {
+    defines += [ "OFFICIAL_BUILD" ]
+  }
+
+  # ==============================================
+  #   PLEASE DO NOT ADD MORE THINGS TO THIS LIST
+  # ==============================================
+  #
+  # See the comment at the top.
+}
+
+# Debug/release ----------------------------------------------------------------
+
+config("debug") {
+  defines = [
+    "DYNAMIC_ANNOTATIONS_ENABLED=1",
+  ]
+  if (!is_win) {
+   defines += [ "_DEBUG" ]
+  }
+  if (is_nacl) {
+    defines += [ "DYNAMIC_ANNOTATIONS_PREFIX=NACL_" ]
+  }
+
+  if (is_win) {
+    if (!enable_iterator_debugging && !use_custom_libcxx) {
+      # Iterator debugging is enabled by default by the compiler on debug
+      # builds, and we have to tell it to turn it off.
+      defines += [ "_HAS_ITERATOR_DEBUGGING=0" ]
+    }
+  } else if ((is_linux || is_chromeos) && target_cpu == "x64" &&
+             enable_iterator_debugging) {
+    # Enable libstdc++ debugging facilities to help catch problems early, see
+    # http://crbug.com/65151 .
+    # TODO(phajdan.jr): Should we enable this for all of POSIX?
+    #defines += [ "_GLIBCXX_DEBUG=1" ]
+  }
+}
+
+config("release") {
+  defines = [ "NDEBUG" ]
+
+  # Sanitizers.
+  if (is_tsan) {
+    defines += [ "DYNAMIC_ANNOTATIONS_ENABLED=1" ]
+  } else {
+    defines += [ "NVALGRIND" ]
+    if (!is_nacl) {
+      # NaCl always enables dynamic annotations. Currently this value is set to
+      # 1 for all .nexes.
+      defines += [ "DYNAMIC_ANNOTATIONS_ENABLED=0" ]
+    }
+  }
+
+  if (is_ios) {
+    # Disable NSAssert and GTMDevAssert (from Google Toolbox for Mac). This
+    # follows XCode's default behavior for Release builds.
+    defines += [ "NS_BLOCK_ASSERTIONS=1" ]
+  }
+}
+
+# Default libraries ------------------------------------------------------------
+
+# This config defines the default libraries applied to all targets.
+config("default_libs") {
+  if (is_win) {
+    # TODO(brettw) this list of defaults should probably be smaller, and
+    # instead the targets that use the less common ones (e.g. wininet or
+    # winspool) should include those explicitly.
+    libs = [
+      "advapi32.lib",
+      "comdlg32.lib",
+      "dbghelp.lib",
+      "dnsapi.lib",
+      "gdi32.lib",
+      "msimg32.lib",
+      "odbc32.lib",
+      "odbccp32.lib",
+      "oleaut32.lib",
+      "shell32.lib",
+      "shlwapi.lib",
+      "user32.lib",
+      "usp10.lib",
+      "uuid.lib",
+      "version.lib",
+      "wininet.lib",
+      "winmm.lib",
+      "winspool.lib",
+      "ws2_32.lib",
+
+      # Please don't add more stuff here. We should actually be making this
+      # list smaller, since all common things should be covered. If you need
+      # some extra libraries, please just add a libs = [ "foo.lib" ] to your
+      # target that needs it.
+    ]
+    if (current_os == "winuwp") {
+      # These libraries are needed for Windows UWP (i.e. store apps).
+      libs += [
+        "dloadhelper.lib",
+        "WindowsApp.lib",
+      ]
+    } else {
+      # These libraries are not compatible with Windows UWP (i.e. store apps.)
+      libs += [
+        "delayimp.lib",
+        "kernel32.lib",
+        "ole32.lib",
+      ]
+    }
+  } else if (is_android) {
+    libs = [
+      "dl",
+      "m",
+    ]
+  } else if (is_mac) {
+    # Targets should choose to explicitly link frameworks they require. Since
+    # linking can have run-time side effects, nothing should be listed here.
+    libs = []
+  } else if (is_ios) {
+    # The libraries listed here will be specified for both the target and the
+    # host. Only the common ones should be listed here.
+    frameworks = [
+      "CoreFoundation.framework",
+      "CoreGraphics.framework",
+      "CoreText.framework",
+      "Foundation.framework",
+    ]
+  } else if (is_linux || is_chromeos) {
+    libs = [
+      "dl",
+      "pthread",
+      "rt",
+    ]
+  }
+}
+
+group("common_deps") {
+  visibility = [
+    ":executable_deps",
+    ":loadable_module_deps",
+    ":shared_library_deps",
+  ]
+
+  # WARNING: This group is a dependency of **every executable and shared
+  # library**.  Please be careful adding new dependencies here.
+  public_deps = []
+
+  if (using_sanitizer) {
+    public_deps += [ "//build/config/sanitizers:deps" ]
+  }
+
+  #if (use_custom_libcxx) {
+  #  public_deps += [ "//buildtools/third_party/libc++" ]
+  #}
+
+  if (use_afl) {
+    public_deps += [ "//third_party/afl" ]
+  }
+
+  if (is_android && use_order_profiling) {
+    public_deps += [ "//base/android/orderfile:orderfile_instrumentation" ]
+  }
+
+  if (is_fuchsia) {
+    public_deps +=
+        [ "//third_party/fuchsia-sdk/sdk/build/config:runtime_library_group" ]
+  }
+}
+
+# Only the executable template in BUILDCONFIG.gn should reference this.
+group("executable_deps") {
+  public_deps = [ ":common_deps" ]
+  if (export_libcxxabi_from_executables) {
+    public_deps += [ "//buildtools/third_party/libc++abi" ]
+  }
+}
+
+# Only the loadable_module template in BUILDCONFIG.gn should reference this.
+group("loadable_module_deps") {
+  public_deps = [ ":common_deps" ]
+}
+
+# Only the shared_library template in BUILDCONFIG.gn should reference this.
+group("shared_library_deps") {
+  public_deps = [ ":common_deps" ]
+}
+
+# Executable configs -----------------------------------------------------------
+
+# Windows linker setup for EXEs and DLLs.
+if (is_win) {
+  _windows_linker_configs = [
+    "//build/config/win:sdk_link",
+    "//build/config/win:common_linker_setup",
+  ]
+}
+
+# This config defines the configs applied to all executables.
+config("executable_config") {
+  configs = []
+
+  if (is_win) {
+    configs += _windows_linker_configs
+  } else if (is_mac) {
+    configs += [ "//build/config/mac:mac_dynamic_flags" ]
+  } else if (is_ios) {
+    configs += [
+      "//build/config/ios:ios_dynamic_flags",
+      "//build/config/ios:ios_executable_flags",
+    ]
+  } else if (is_linux || is_chromeos || is_android || current_os == "aix") {
+    configs += [ "//build/config/gcc:executable_config" ]
+    if (is_chromecast) {
+      configs += [ "//build/config/chromecast:executable_config" ]
+    } else if (is_fuchsia) {
+      configs += [ "//build/config/fuchsia:executable_config" ]
+    }
+  }
+
+  # If we're using the prebuilt instrumented libraries with the sanitizers, we
+  # need to add ldflags to every binary to make sure they are picked up.
+  if (prebuilt_instrumented_libraries_available) {
+    configs += [ "//third_party/instrumented_libraries:prebuilt_ldflags" ]
+  }
+  if (use_locally_built_instrumented_libraries) {
+    configs += [ "//third_party/instrumented_libraries:locally_built_ldflags" ]
+  }
+  configs += [ "//build/config/sanitizers:link_executable" ]
+}
+
+# Shared library configs -------------------------------------------------------
+
+# This config defines the configs applied to all shared libraries.
+config("shared_library_config") {
+  configs = []
+
+  if (is_win) {
+    configs += _windows_linker_configs
+  } else if (is_mac) {
+    configs += [ "//build/config/mac:mac_dynamic_flags" ]
+  } else if (is_ios) {
+    configs += [
+      "//build/config/ios:ios_dynamic_flags",
+      "//build/config/ios:ios_shared_library_flags",
+    ]
+  } else if (is_chromecast) {
+    configs += [ "//build/config/chromecast:shared_library_config" ]
+  } else if (is_linux || is_chromeos || current_os == "aix") {
+    configs += [ "//build/config/gcc:shared_library_config" ]
+  }
+
+  # If we're using the prebuilt instrumented libraries with the sanitizers, we
+  # need to add ldflags to every binary to make sure they are picked up.
+  if (prebuilt_instrumented_libraries_available) {
+    configs += [ "//third_party/instrumented_libraries:prebuilt_ldflags" ]
+  }
+  if (use_locally_built_instrumented_libraries) {
+    configs += [ "//third_party/instrumented_libraries:locally_built_ldflags" ]
+  }
+  configs += [ "//build/config/sanitizers:link_shared_library" ]
+}
+
+# Add this config to your target to enable precompiled headers.
+#
+# Precompiled headers are done on a per-target basis. If you have just a couple
+# of files, the time it takes to precompile (~2 seconds) can actually be longer
+# than the time saved. On a Z620, a 100 file target compiles about 2 seconds
+# faster with precompiled headers, with greater savings for larger targets.
+#
+# Recommend precompiled headers for targets with more than 50 .cc files.
+config("precompiled_headers") {
+  if (enable_precompiled_headers) {
+    if (is_win) {
+      # This is a string rather than a file GN knows about. It has to match
+      # exactly what's in the /FI flag below, and what might appear in the
+      # source code in quotes for an #include directive.
+      precompiled_header = "build/precompile.h"
+
+      # This is a file that GN will compile with the above header. It will be
+      # implicitly added to the sources (potentially multiple times, with one
+      # variant for each language used in the target).
+      precompiled_source = "//build/precompile.cc"
+
+      # Force include the header.
+      cflags = [ "/FI$precompiled_header" ]
+    } else if (is_mac || is_linux) {
+      precompiled_source = "//build/precompile.h"
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/BUILDCONFIG.gn b/third_party/libwebrtc/build/config/BUILDCONFIG.gn
new file mode 100644
index 0000000000..571ae5f0d6
--- /dev/null
+++ b/third_party/libwebrtc/build/config/BUILDCONFIG.gn
@@ -0,0 +1,588 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# =============================================================================
+# WHAT IS THIS FILE?
+# =============================================================================
+#
+# This is the master GN build configuration. This file is loaded after the
+# build args (args.gn) for the build directory and after the toplevel ".gn"
+# file (which points to this file as the build configuration).
+#
+# This file will be executed and the resulting context will be used to execute
+# every other file in the build. So variables declared here (that don't start
+# with an underscore) will be implicitly global.
+
+# =============================================================================
+# PLATFORM SELECTION
+# =============================================================================
+#
+# There are two main things to set: "os" and "cpu". The "toolchain" is the name
+# of the GN thing that encodes combinations of these things.
+#
+# Users typically only set the variables "target_os" and "target_cpu" in "gn
+# args", the rest are set up by our build and internal to GN.
+#
+# There are three different types of each of these things: The "host"
+# represents the computer doing the compile and never changes. The "target"
+# represents the main thing we're trying to build. The "current" represents
+# which configuration is currently being defined, which can be either the
+# host, the target, or something completely different (like nacl). GN will
+# run the same build file multiple times for the different required
+# configuration in the same build.
+#
+# This gives the following variables:
+#  - host_os, host_cpu, host_toolchain
+#  - target_os, target_cpu, default_toolchain
+#  - current_os, current_cpu, current_toolchain.
+#
+# Note the default_toolchain isn't symmetrical (you would expect
+# target_toolchain). This is because the "default" toolchain is a GN built-in
+# concept, and "target" is something our build sets up that's symmetrical with
+# its GYP counterpart. Potentially the built-in default_toolchain variable
+# could be renamed in the future.
+#
+# When writing build files, to do something only for the host:
+#   if (current_toolchain == host_toolchain) { ...
+
+if (target_os == "") {
+  target_os = host_os
+}
+
+if (target_cpu == "") {
+  if (target_os == "android") {
+    # If we're building for Android, we should assume that we want to
+    # build for ARM by default, not the host_cpu (which is likely x64).
+    # This allows us to not have to specify both target_os and target_cpu
+    # on the command line.
+    target_cpu = "arm"
+  } else {
+    target_cpu = host_cpu
+  }
+}
+
+if (current_cpu == "") {
+  current_cpu = target_cpu
+}
+if (current_os == "") {
+  current_os = target_os
+}
+
+# =============================================================================
+# BUILD FLAGS
+# =============================================================================
+#
+# This block lists input arguments to the build, along with their default
+# values.
+#
+# If a value is specified on the command line, it will overwrite the defaults
+# given in a declare_args block, otherwise the default will be used.
+#
+# YOU SHOULD ALMOST NEVER NEED TO ADD FLAGS TO THIS FILE. GN allows any file in
+# the build to declare build flags. If you need a flag for a single component,
+# you can just declare it in the corresponding BUILD.gn file.
+#
+# - If your feature is a single target, say //components/foo, you can put
+#   a declare_args() block in //components/foo/BUILD.gn and use it there.
+#   Nobody else in the build needs to see the flag.
+#
+# - Defines based on build variables should be implemented via the generated
+#   build flag header system. See //build/buildflag_header.gni. You can put
+#   the buildflag_header target in the same file as the build flag itself. You
+#   should almost never set "defines" directly.
+#
+# - If your flag toggles a target on and off or toggles between different
+#   versions of similar things, write a "group" target that forwards to the
+#   right target (or no target) depending on the value of the build flag. This
+#   group can be in the same BUILD.gn file as the build flag, and targets can
+#   depend unconditionally on the group rather than duplicating flag checks
+#   across many targets.
+#
+# - If a semi-random set of build files REALLY needs to know about a define and
+#   the above pattern for isolating the build logic in a forwarding group
+#   doesn't work, you can put the argument in a .gni file. This should be put
+#   in the lowest level of the build that knows about this feature (which should
+#   almost always be outside of the //build directory!).
+#
+# Other flag advice:
+#
+# - Use boolean values when possible. If you need a default value that expands
+#   to some complex thing in the default case (like the location of the
+#   compiler which would be computed by a script), use a default value of -1 or
+#   the empty string. Outside of the declare_args block, conditionally expand
+#   the default value as necessary.
+#
+# - Use a name like "use_foo" or "is_foo" (whatever is more appropriate for
+#   your feature) rather than just "foo".
+#
+# - Write good comments directly above the declaration with no blank line.
+#   These comments will appear as documentation in "gn args --list".
+#
+# - Don't call exec_script inside declare_args. This will execute the script
+#   even if the value is overridden, which is wasteful. See first bullet.
+
+declare_args() {
+  # Set to enable the official build level of optimization. This has nothing
+  # to do with branding, but enables an additional level of optimization above
+  # release (!is_debug). This might be better expressed as a tri-state
+  # (debug, release, official) but for historical reasons there are two
+  # separate flags.
+  is_official_build = false
+
+  # Set to true when compiling with the Clang compiler.
+  is_clang = current_os != "linux" || current_os == "openbsd" ||
+             (current_cpu != "s390x" && current_cpu != "s390" &&
+              current_cpu != "ppc64" && current_cpu != "ppc" &&
+              current_cpu != "mips" && current_cpu != "mips64" &&
+              current_cpu != "riscv64")
+
+  # Allows the path to a custom target toolchain to be injected as a single
+  # argument, and set as the default toolchain.
+  custom_toolchain = ""
+
+  # This should not normally be set as a build argument.  It's here so that
+  # every toolchain can pass through the "global" value via toolchain_args().
+  host_toolchain = ""
+
+  # DON'T ADD MORE FLAGS HERE. Read the comment above.
+}
+
+declare_args() {
+  # Debug build. Enabling official builds automatically sets is_debug to false.
+  is_debug = !is_official_build
+}
+
+declare_args() {
+  # Component build. Setting to true compiles targets declared as "components"
+  # as shared libraries loaded dynamically. This speeds up development time.
+  # When false, components will be linked statically.
+  #
+  # For more information see
+  # https://chromium.googlesource.com/chromium/src/+/main/docs/component_build.md
+  is_component_build = is_debug && current_os != "ios"
+}
+
+assert(!(is_debug && is_official_build), "Can't do official debug builds")
+
+# ==============================================================================
+# TOOLCHAIN SETUP
+# ==============================================================================
+#
+# Here we set the default toolchain, as well as the variable host_toolchain
+# which will identify the toolchain corresponding to the local system when
+# doing cross-compiles. When not cross-compiling, this will be the same as the
+# default toolchain.
+#
+# We do this before anything else to make sure we complain about any
+# unsupported os/cpu combinations as early as possible.
+
+if (host_toolchain == "") {
+  # This should only happen in the top-level context.
+  # In a specific toolchain context, the toolchain_args()
+  # block should have propagated a value down.
+  # TODO(dpranke): Add some sort of assert here that verifies that
+  # no toolchain omitted host_toolchain from its toolchain_args().
+
+  if (host_os == "linux" || host_os == "openbsd") {
+    if (target_os != "linux") {
+      host_toolchain = "//build/toolchain/linux:clang_$host_cpu"
+    } else if (is_clang) {
+      host_toolchain = "//build/toolchain/linux:clang_$host_cpu"
+    } else {
+      host_toolchain = "//build/toolchain/linux:$host_cpu"
+    }
+  } else if (host_os == "mac") {
+    host_toolchain = "//build/toolchain/mac:clang_$host_cpu"
+  } else if (host_os == "win") {
+    # On Windows always use the target CPU for host builds for x86/x64. On the
+    # configurations we support this will always work and it saves build steps.
+    # Windows ARM64 targets require an x64 host for cross build.
+    if (target_cpu == "x86" || target_cpu == "x64") {
+      if (is_clang) {
+        host_toolchain = "//build/toolchain/win:win_clang_$target_cpu"
+      } else {
+        host_toolchain = "//build/toolchain/win:$target_cpu"
+      }
+    } else if (is_clang) {
+      host_toolchain = "//build/toolchain/win:win_clang_$host_cpu"
+    } else {
+      host_toolchain = "//build/toolchain/win:$host_cpu"
+    }
+  } else if (host_os == "aix") {
+    host_toolchain = "//build/toolchain/aix:$host_cpu"
+  } else {
+    assert(false, "Unsupported host_os: $host_os")
+  }
+}
+
+_default_toolchain = ""
+
+if (target_os == "android") {
+  assert(host_os == "linux" || host_os == "mac",
+         "Android builds are only supported on Linux and Mac hosts.")
+  _default_toolchain = "//build/toolchain/android:android_clang_$target_cpu"
+} else if (target_os == "chromeos" || target_os == "linux" || target_os == "openbsd") {
+  # See comments in build/toolchain/cros/BUILD.gn about board compiles.
+  if (is_clang) {
+    _default_toolchain = "//build/toolchain/linux:clang_$target_cpu"
+  } else {
+    _default_toolchain = "//build/toolchain/linux:$target_cpu"
+  }
+} else if (target_os == "fuchsia") {
+  _default_toolchain = "//build/toolchain/fuchsia:$target_cpu"
+} else if (target_os == "ios") {
+  _default_toolchain = "//build/toolchain/ios:ios_clang_$target_cpu"
+} else if (target_os == "mac") {
+  #assert(host_os == "mac" || host_os == "linux",
+  #       "Mac cross-compiles are unsupported.")
+  _default_toolchain = "//build/toolchain/mac:clang_$target_cpu"
+} else if (target_os == "win") {
+  # On Windows, we use the same toolchain for host and target by default.
+  # Beware, win cross builds have some caveats, see docs/win_cross.md
+  if (is_clang) {
+    _default_toolchain = "//build/toolchain/win:win_clang_$target_cpu"
+  } else {
+    _default_toolchain = "//build/toolchain/win:$target_cpu"
+  }
+} else if (target_os == "winuwp") {
+  # Only target WinUWP on for a Windows store application and only
+  # x86, x64 and arm are supported target CPUs.
+  assert(target_cpu == "x86" || target_cpu == "x64" || target_cpu == "arm" ||
+         target_cpu == "arm64")
+  _default_toolchain = "//build/toolchain/win:uwp_$target_cpu"
+} else if (target_os == "aix") {
+  _default_toolchain = "//build/toolchain/aix:$target_cpu"
+} else {
+  assert(false, "Unsupported target_os: $target_os")
+}
+
+# If a custom toolchain has been set in the args, set it as default. Otherwise,
+# set the default toolchain for the platform (if any).
+if (custom_toolchain != "") {
+  set_default_toolchain(custom_toolchain)
+} else if (_default_toolchain != "") {
+  set_default_toolchain(_default_toolchain)
+}
+
+# =============================================================================
+# OS DEFINITIONS
+# =============================================================================
+#
+# We set these various is_FOO booleans for convenience in writing OS-based
+# conditions.
+#
+# - is_android, is_chromeos, is_ios, and is_win should be obvious.
+# - is_mac is set only for desktop Mac. It is not set on iOS.
+# - is_posix is true for mac and any Unix-like system (basically everything
+#   except Fuchsia and Windows).
+# - is_linux is true for desktop Linux, but not for ChromeOS nor Android (which
+#   is generally too different despite being based on the Linux kernel).
+#
+# Do not add more is_* variants here for random lesser-used Unix systems like
+# aix or one of the BSDs. If you need to check these, just check the
+# current_os value directly.
+
+is_android = current_os == "android"
+is_chromeos = current_os == "chromeos"
+is_fuchsia = current_os == "fuchsia"
+is_ios = current_os == "ios"
+is_linux = current_os == "linux"
+is_bsd = current_os == "openbsd"
+is_mac = current_os == "mac"
+is_nacl = current_os == "nacl"
+is_win = current_os == "win" || current_os == "winuwp"
+
+is_apple = is_ios || is_mac
+is_posix = !is_win && !is_fuchsia
+
+# =============================================================================
+# TARGET DEFAULTS
+# =============================================================================
+#
+# Set up the default configuration for every build target of the given type.
+# The values configured here will be automatically set on the scope of the
+# corresponding target. Target definitions can add or remove to the settings
+# here as needed.
+#
+# WHAT GOES HERE?
+#
+# Other than the main compiler and linker configs, the only reason for a config
+# to be in this list is if some targets need to explicitly override that config
+# by removing it. This is how targets opt-out of flags. If you don't have that
+# requirement and just need to add a config everywhere, reference it as a
+# sub-config of an existing one, most commonly the main "compiler" one.
+
+# Holds all configs used for running the compiler.
+default_compiler_configs = [
+  "//build/config:feature_flags",
+  "//build/config/compiler:afdo",
+  "//build/config/compiler:afdo_optimize_size",
+  "//build/config/compiler:cet_shadow_stack",
+  "//build/config/compiler:compiler",
+  "//build/config/compiler:compiler_arm_fpu",
+  "//build/config/compiler:compiler_arm_thumb",
+  "//build/config/compiler:chromium_code",
+  "//build/config/compiler:default_include_dirs",
+  "//build/config/compiler:default_optimization",
+  "//build/config/compiler:default_stack_frames",
+  "//build/config/compiler:default_symbols",
+  "//build/config/compiler:export_dynamic",
+  "//build/config/compiler:no_exceptions",
+  "//build/config/compiler:no_rtti",
+  "//build/config/compiler:runtime_library",
+  "//build/config/compiler:thin_archive",
+  "//build/config/compiler:thinlto_optimize_default",
+  "//build/config/compiler:default_init_stack_vars",
+  "//build/config/compiler:no_unresolved_symbols",
+  "//build/config/compiler/pgo:default_pgo_flags",
+  "//build/config/coverage:default_coverage",
+  "//build/config/sanitizers:default_sanitizer_flags",
+]
+
+if (is_win) {
+  default_compiler_configs += [
+    "//build/config/win:default_cfg_compiler",
+    "//build/config/win:default_crt",
+    "//build/config/win:lean_and_mean",
+    "//build/config/win:nominmax",
+    "//build/config/win:unicode",
+    "//build/config/win:winver",
+  ]
+}
+
+if (is_posix) {
+  if (current_os != "aix") {
+    default_compiler_configs +=
+        [ "//build/config/gcc:symbol_visibility_hidden" ]
+  }
+}
+
+if (is_fuchsia) {
+  default_compiler_configs += [ "//build/config/gcc:symbol_visibility_hidden" ]
+}
+
+if (is_android) {
+  default_compiler_configs +=
+      [ "//build/config/android:default_orderfile_instrumentation" ]
+}
+
+if (is_clang && !is_nacl) {
+  default_compiler_configs += [
+    "//build/config/clang:find_bad_constructs",
+    "//build/config/clang:extra_warnings",
+  ]
+}
+
+# Debug/release-related defines.
+if (is_debug) {
+  default_compiler_configs += [ "//build/config:debug" ]
+} else {
+  default_compiler_configs += [ "//build/config:release" ]
+}
+
+# Static libraries and source sets use only the compiler ones.
+set_defaults("static_library") {
+  configs = default_compiler_configs
+}
+set_defaults("source_set") {
+  configs = default_compiler_configs
+}
+set_defaults("rust_library") {
+  configs = default_compiler_configs
+}
+set_defaults("rust_proc_macro") {
+  configs = default_compiler_configs
+}
+
+# Compute the set of configs common to all linked targets (shared libraries,
+# loadable modules, executables) to avoid duplication below.
+if (is_win) {
+  # Many targets remove these configs, so they are not contained within
+  # //build/config:executable_config for easy removal.
+  _linker_configs = [
+    "//build/config/win:default_incremental_linking",
+
+    # Default to console-mode apps. Most of our targets are tests and such
+    # that shouldn't use the windows subsystem.
+    "//build/config/win:console",
+  ]
+} else if (is_mac) {
+  _linker_configs = [ "//build/config/mac:strip_all" ]
+} else {
+  _linker_configs = []
+}
+
+# Executable defaults.
+default_executable_configs = default_compiler_configs + [
+                               "//build/config:default_libs",
+                               "//build/config:executable_config",
+                             ] + _linker_configs
+
+if (is_win) {
+  # Turn on linker CFI for executables, and position it so it can be removed
+  # if needed.
+  default_executable_configs += [ "//build/config/win:cfi_linker" ]
+}
+
+set_defaults("executable") {
+  configs = default_executable_configs
+}
+
+# Shared library and loadable module defaults (also for components in component
+# mode).
+default_shared_library_configs = default_compiler_configs + [
+                                   "//build/config:default_libs",
+                                   "//build/config:shared_library_config",
+                                 ] + _linker_configs
+if (is_win) {
+  # Turn on linker CFI for DLLs, and position it so it can be removed if needed.
+  default_shared_library_configs += [ "//build/config/win:cfi_linker" ]
+}
+
+if (is_android) {
+  # Strip native JNI exports from shared libraries by default. Binaries that
+  # want this can remove this config.
+  default_shared_library_configs +=
+      [ "//build/config/android:hide_all_but_jni_onload" ]
+}
+set_defaults("shared_library") {
+  configs = default_shared_library_configs
+}
+set_defaults("loadable_module") {
+  configs = default_shared_library_configs
+
+  # loadable_modules are generally used by other libs, not just via JNI.
+  if (is_android) {
+    configs -= [ "//build/config/android:hide_all_but_jni_onload" ]
+  }
+}
+
+# A helper for forwarding testonly and visibility.
+# Forwarding "*" does not include variables from outer scopes (to avoid copying
+# all globals into each template invocation), so it will not pick up
+# file-scoped or outer-template-scoped variables. Normally this behavior is
+# desired, but "visibility" and "testonly" are commonly defined in outer scopes.
+# Explicitly forwarding them in forward_variables_from() works around this
+# nuance. See //build/docs/writing_gn_templates.md#using-forward_variables_from
+TESTONLY_AND_VISIBILITY = [
+  "testonly",
+  "visibility",
+]
+
+# Sets default dependencies for executable and shared_library targets.
+#
+# Variables
+#   no_default_deps: If true, no standard dependencies will be added.
+#       Targets that set this usually also want to remove
+#       "//build/config/compiler:runtime_library" from configs (to remove
+#       its subconfig "//build/config/c++:runtime_library").
+foreach(_target_type,
+        [
+          "executable",
+          "loadable_module",
+          "shared_library",
+        ]) {
+  template(_target_type) {
+    # Alias "target_name" because it is clobbered by forward_variables_from().
+    _target_name = target_name
+    target(_target_type, _target_name) {
+      forward_variables_from(invoker,
+                             "*",
+                             TESTONLY_AND_VISIBILITY + [ "no_default_deps" ])
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+      if (!defined(deps)) {
+        deps = []
+      }
+      if (!defined(invoker.no_default_deps) || !invoker.no_default_deps) {
+        # This pulls in one of:
+        # //build/config:executable_deps
+        # //build/config:loadable_module_deps
+        # //build/config:shared_library_deps
+        # (This explicit list is so that grepping for these configs finds where
+        # they are used.)
+        deps += [ "//build/config:${_target_type}_deps" ]
+      }
+
+      # On Android, write shared library output file to metadata. We will use
+      # this information to, for instance, collect all shared libraries that
+      # should be packaged into an APK.
+      if (!defined(invoker.metadata) && is_android &&
+          (_target_type == "shared_library" ||
+           _target_type == "loadable_module")) {
+        _output_name = _target_name
+        if (defined(invoker.output_name)) {
+          _output_name = invoker.output_name
+        }
+
+        # Remove 'lib' prefix from output name if it exists.
+        _magic_prefix = "$0x01$0x01"
+        _output_name = string_replace("${_magic_prefix}${_output_name}",
+                                      "${_magic_prefix}lib",
+                                      _magic_prefix,
+                                      1)
+        _output_name = string_replace(_output_name, _magic_prefix, "", 1)
+
+        if (defined(output_extension)) {
+          _shlib_extension = ".$output_extension"
+        } else if (is_component_build && _target_type != "loadable_module") {
+          _shlib_extension = ".cr.so"
+        } else {
+          _shlib_extension = ".so"
+        }
+
+        metadata = {
+          shared_libraries =
+              [ "$root_out_dir/lib${_output_name}${_shlib_extension}" ]
+        }
+      }
+    }
+  }
+}
+
+# ==============================================================================
+# COMPONENT SETUP
+# ==============================================================================
+
+# Defines a component, which equates to a shared_library when
+# is_component_build == true and a static_library otherwise.
+#
+# Use static libraries for the static build rather than source sets because
+# many of of our test binaries link many large dependencies but often don't
+# use large portions of them. The static libraries are much more efficient to
+# link in this situation since only the necessary object files are linked.
+#
+# The invoker can override the type of the target in the non-component-build
+# case by setting static_component_type to either "source_set" or
+# "static_library". If unset, the default will be used.
+template("component") {
+  if (is_component_build) {
+    _component_mode = "shared_library"
+  } else if (defined(invoker.static_component_type)) {
+    assert(invoker.static_component_type == "static_library" ||
+           invoker.static_component_type == "source_set")
+    _component_mode = invoker.static_component_type
+  } else if (!defined(invoker.sources) || invoker.sources == []) {
+    # When there are no sources defined, use a source set to avoid creating
+    # an empty static library (which generally don't work).
+    _component_mode = "source_set"
+  } else {
+    _component_mode = "static_library"
+  }
+  target(_component_mode, target_name) {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+  }
+}
+
+# Component defaults
+set_defaults("component") {
+  if (is_component_build) {
+    configs = default_shared_library_configs
+    if (is_android) {
+      configs -= [ "//build/config/android:hide_all_but_jni_onload" ]
+    }
+  } else {
+    configs = default_compiler_configs
+  }
+}
diff --git a/third_party/libwebrtc/build/config/OWNERS b/third_party/libwebrtc/build/config/OWNERS
new file mode 100644
index 0000000000..eeb67065c2
--- /dev/null
+++ b/third_party/libwebrtc/build/config/OWNERS
@@ -0,0 +1,5 @@
+dpranke@google.com
+scottmg@chromium.org
+
+per-file ozone.gni=file://ui/ozone/OWNERS
+per-file ozone_extra.gni=file://ui/ozone/OWNERS
diff --git a/third_party/libwebrtc/build/config/aix/BUILD.gn b/third_party/libwebrtc/build/config/aix/BUILD.gn
new file mode 100644
index 0000000000..9079f6f53e
--- /dev/null
+++ b/third_party/libwebrtc/build/config/aix/BUILD.gn
@@ -0,0 +1,61 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/sanitizers/sanitizers.gni")
+import("//build/toolchain/toolchain.gni")
+
+# This is included by reference in the //build/config/compiler config that
+# is applied to all targets. It is here to separate out the logic.
+
+config("compiler") {
+  # These flags are shared between the C compiler and linker.
+  defines = [
+    "_LINUX_SOURCE_COMPAT=1",
+    "__STDC_FORMAT_MACROS",
+    "_ALL_SOURCE=1",
+  ]
+
+  cflags = [
+    "-Wall",
+    "-Wno-unused-parameter",
+    "-pthread",
+    "-Wmissing-field-initializers",
+    "-Wno-uninitialized",
+    "-mcpu=power5+",
+    "-mfprnd",
+    "-mno-popcntb",
+    "-maix64",
+    "-fdata-sections",
+    "-ffunction-sections",
+    "-O3",
+
+    # "-Werror"
+    # We need to find a way to fix the TOC warnings if we want to enable this.
+  ]
+
+  cflags_cc = [
+    "-fno-rtti",
+    "-fno-exceptions",
+    "-Wno-narrowing",
+    "-Wno-non-virtual-dtor",
+  ]
+
+  ldflags = [
+    "-pthread",
+    "-maix64",
+    "-Wl,-bbigtoc",
+  ]
+
+  if (is_component_build) {
+    cflags += [
+      "-fpic",
+    ]
+    ldflags += [
+      "-Wl,-brtl",
+      # -bnoipath so that only names of .so objects are stored in loader
+      # section, excluding leading "./"
+      "-Wl,-bnoipath",
+    ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/android/BUILD.gn b/third_party/libwebrtc/build/config/android/BUILD.gn
new file mode 100644
index 0000000000..a77a628be4
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/BUILD.gn
@@ -0,0 +1,161 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/android/config.gni")
+import("//build/config/c++/c++.gni")
+import("//build/config/compiler/compiler.gni")
+import("//build/config/sanitizers/sanitizers.gni")
+
+if (current_toolchain == default_toolchain) {
+  import("//build/toolchain/concurrent_links.gni")
+}
+
+assert(is_android)
+
+# This is included by reference in the //build/config/compiler config that
+# is applied to all targets. It is here to separate out the logic that is
+# Android-only.
+config("compiler") {
+  cflags = [
+    "-ffunction-sections",
+    "-fno-short-enums",
+  ]
+  defines = [
+    "ANDROID",
+
+    # The NDK has these things, but doesn't define the constants to say that it
+    # does. Define them here instead.
+    "HAVE_SYS_UIO_H",
+
+    # Forces full rebuilds on NDK rolls. To rebuild everything when NDK version
+    # stays the same, increment the suffix number.
+    "ANDROID_NDK_VERSION_ROLL=${android_ndk_version}_1",
+  ]
+
+  if (target_cpu == "mips64el") {
+    cflags += [
+      # Have to force IAS for mips64.
+      "-fintegrated-as",
+    ]
+  }
+
+  ldflags = [
+    # Don't allow visible symbols from libgcc or libc++ to be
+    # re-exported.
+    "-Wl,--exclude-libs=libgcc.a",
+
+    # Don't allow visible symbols from libraries that contain
+    # assembly code with symbols that aren't hidden properly.
+    # http://crbug.com/448386
+    "-Wl,--exclude-libs=libvpx_assembly_arm.a",
+  ]
+
+  # TODO(crbug.com/1184398): Move to compiler-rt when we are ready.
+  ldflags += [ "--rtlib=libgcc" ]
+  if (target_cpu == "arm64") {
+    # For outline atomics on AArch64 (can't pass this unconditionally
+    # due to unused flag warning on other targets).
+    cflags += [ "--rtlib=libgcc" ]
+    if (arm_control_flow_integrity == "standard") {
+      cflags += [ "-mbranch-protection=standard" ]
+    }
+  }
+
+  # $compile_api_level corresponds to the API level used for the sysroot path
+  # calculation in //build/config/android/config.gni
+  if (android_64bit_target_cpu) {
+    compile_api_level = android64_ndk_api_level
+  } else {
+    compile_api_level = android32_ndk_api_level
+  }
+
+  cflags += [ "--target=$android_abi_target$compile_api_level" ]
+  ldflags += [ "--target=$android_abi_target$compile_api_level" ]
+
+  # Assign any flags set for the C compiler to asmflags so that they are sent
+  # to the assembler.
+  asmflags = cflags
+}
+
+# This is included by reference in the //build/config/compiler:runtime_library
+# config that is applied to all targets. It is here to separate out the logic
+# that is Android-only. Please see that target for advice on what should go in
+# :runtime_library vs. :compiler.
+config("runtime_library") {
+  # Let the linker find libgcc.a.
+  ldflags = [ "--gcc-toolchain=" +
+              rebase_path(android_toolchain_root, root_build_dir) ]
+
+  libs = []
+
+  # On 64-bit platforms, the only symbols provided by libandroid_support.a are
+  # strto{d,f,l,ul}_l. These symbols are not used by our libc++, and newer NDKs
+  # don't provide a libandroid_support.a on 64-bit platforms, so we only depend
+  # on this library on 32-bit platforms.
+  if (target_cpu == "arm" || target_cpu == "x86") {
+    libs += [ "android_support" ]
+  }
+
+  # arm builds of libc++ starting in NDK r12 depend on unwind.
+  if (target_cpu == "arm") {
+    libs += [ "unwind" ]
+  }
+
+  if (target_cpu == "arm" && arm_version == 6) {
+    libs += [ "atomic" ]
+  }
+
+  if (target_cpu == "mipsel") {
+    libs += [ "atomic" ]
+  }
+
+  # TODO(jdduke) Re-enable on mips after resolving linking
+  # issues with libc++ (crbug.com/456380).
+  if (target_cpu != "mipsel" && target_cpu != "mips64el") {
+    ldflags += [ "-Wl,--warn-shared-textrel" ]
+  }
+}
+
+config("hide_all_but_jni_onload") {
+  ldflags = [ "-Wl,--version-script=" + rebase_path(
+                  "//build/android/android_only_explicit_jni_exports.lst",
+                  root_build_dir) ]
+}
+
+config("hide_all_but_jni") {
+  ldflags = [ "-Wl,--version-script=" +
+              rebase_path("//build/android/android_only_jni_exports.lst",
+                          root_build_dir) ]
+}
+
+config("lld_pack_relocations") {
+  ldflags = [ "-Wl,--pack-dyn-relocs=android" ]
+}
+
+# Used for instrumented build to generate the orderfile.
+config("default_orderfile_instrumentation") {
+  if (use_order_profiling) {
+    cflags = [ "-finstrument-function-entry-bare" ]
+    if (use_thin_lto) {
+      # TODO(pcc): This should not be necessary. Remove once
+      # https://reviews.llvm.org/D50016 lands and gets rolled in.
+      ldflags = [ "-Wl,-u,__cyg_profile_func_enter_bare" ]
+    }
+  }
+}
+
+if (current_toolchain == default_toolchain) {
+  pool("goma_javac_pool") {
+    # Override action_pool when goma is enabled for javac.
+    depth = 10000
+  }
+
+  # When defined, this pool should be used instead of link_pool for command
+  # that need 1-2GB of RAM. https://crbug.com/1078460
+  if (defined(java_cmd_pool_size)) {
+    pool("java_cmd_pool") {
+      depth = java_cmd_pool_size
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/android/OWNERS b/third_party/libwebrtc/build/config/android/OWNERS
new file mode 100644
index 0000000000..a74cfbe228
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/OWNERS
@@ -0,0 +1 @@
+file://build/android/OWNERS
diff --git a/third_party/libwebrtc/build/config/android/abi.gni b/third_party/libwebrtc/build/config/android/abi.gni
new file mode 100644
index 0000000000..1dbbf0cd61
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/abi.gni
@@ -0,0 +1,101 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Logic separated out from config.gni so that it can be used by compiler.gni
+# without introducing a circular dependency.
+
+# NOTE: Because Chrome OS builds may depend on targets built with the Android
+# toolchain, this GNI file may be read and processed from within Chrome OS
+# toolchains. Checking |is_android| here would therefore be too restrictive.
+assert(is_android || is_chromeos)
+
+declare_args() {
+  # Adds intrumentation to each function. Writes a file with the order that
+  # functions are called at startup.
+  use_order_profiling = false
+
+  # Only effective if use_order_profiling = true. When this is true,
+  # instrumentation switches from startup profiling after a delay, and
+  # then waits for a devtools memory dump request to dump all
+  # profiling information. When false, the same delay is used to switch from
+  # startup, and then after a second delay all profiling information is dumped.
+  # See base::android::orderfile::StartDelayedDump for more information.
+  devtools_instrumentation_dumping = false
+
+  # Only effective if use_order_profiling = true. When this is true the call
+  # graph based instrumentation is used.
+  use_call_graph = false
+
+  # Build additional browser splits with HWASAN instrumentation enabled.
+  build_hwasan_splits = false
+
+  # *For CQ puposes only* Leads to non-working APKs.
+  # Forces all APKs/bundles to be 64-bit only to improve build speed in the CQ
+  # (no need to also build 32-bit library).
+  skip_secondary_abi_for_cq = false
+}
+
+assert(!devtools_instrumentation_dumping || use_order_profiling,
+       "devtools_instrumentation_dumping requires use_order_profiling")
+assert(!use_call_graph || use_order_profiling,
+       "use_call_graph requires use_order_profiling")
+
+if (target_cpu == "x86") {
+  android_app_abi = "x86"
+  android_abi_target = "i686-linux-android"
+} else if (target_cpu == "arm") {
+  import("//build/config/arm.gni")
+  if (arm_version < 7) {
+    android_app_abi = "armeabi"
+  } else {
+    android_app_abi = "armeabi-v7a"
+  }
+  android_abi_target = "arm-linux-androideabi"
+} else if (target_cpu == "mipsel") {
+  android_app_abi = "mips"
+  android_abi_target = "mipsel-linux-android"
+} else if (target_cpu == "x64") {
+  android_app_abi = "x86_64"
+
+  # Place holder for x64 support, not tested.
+  # TODO: Enable clang support for Android x64. http://crbug.com/539781
+  android_abi_target = "x86_64-linux-android"
+} else if (target_cpu == "arm64") {
+  android_app_abi = "arm64-v8a"
+  android_abi_target = "aarch64-linux-android"
+} else if (target_cpu == "mips64el") {
+  android_app_abi = "mips64"
+
+  # Place holder for mips64 support, not tested.
+  android_abi_target = "mips64el-linux-android"
+} else {
+  assert(false, "Unknown Android ABI: " + target_cpu)
+}
+
+if (target_cpu == "arm64" || target_cpu == "x64" || target_cpu == "mips64el") {
+  android_64bit_target_cpu = true
+} else if (target_cpu == "arm" || target_cpu == "x86" ||
+           target_cpu == "mipsel") {
+  android_64bit_target_cpu = false
+} else {
+  assert(false, "Unknown target CPU: $target_cpu")
+}
+
+# Intentionally do not define android_app_secondary_abi_cpu and
+# android_app_secondary_abi for 32-bit target_cpu, since they are not used.
+if (target_cpu == "arm64") {
+  android_secondary_abi_cpu = "arm"
+  android_app_secondary_abi = "armeabi-v7a"
+} else if (target_cpu == "x64") {
+  android_secondary_abi_cpu = "x86"
+  android_app_secondary_abi = "x86"
+} else if (target_cpu == "mips64el") {
+  android_secondary_abi_cpu = "mipsel"
+  android_app_secondary_abi = "mips"
+}
+
+if (defined(android_secondary_abi_cpu)) {
+  android_secondary_abi_toolchain =
+      "//build/toolchain/android:android_clang_${android_secondary_abi_cpu}"
+}
diff --git a/third_party/libwebrtc/build/config/android/android_nocompile.gni b/third_party/libwebrtc/build/config/android/android_nocompile.gni
new file mode 100644
index 0000000000..8ffca0e138
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/android_nocompile.gni
@@ -0,0 +1,113 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/android/rules.gni")
+
+declare_args() {
+  # Used by tests to enable generating build files for GN targets which should
+  # not compile.
+  enable_android_nocompile_tests = false
+}
+
+# Defines a test suite which checks that the 'test targets' fail to compile. The
+# test suite runs 'gn gen' with a custom output directory and attempts to compile
+# each test target.
+#
+# All of the tests should be defined in the same dedicated BUILD.gn file in order
+# to minimize the number of targets that are processed by 'gn gen'.
+#
+# Variables
+#   tests: List of test configurations. A test configuration has the following
+#     keys:
+#     'target': The GN target which should not compile when
+#       enable_android_nocompile_tests=true The target should compile when
+#       enable_android_nocompile_tests=false.
+#     'expected_compile_output_regex': Error message regex to search for when compile fails.
+#     'nocompile_sources': Source files which do not compile. This ensures that
+#       the test suite is re-run when one of these files change (as the test
+#       targets might not depend of the files when
+#       enable_android_nocompile_tests=false).
+template("android_nocompile_test_suite") {
+  assert(!enable_android_nocompile_tests)
+
+  action(target_name) {
+    testonly = true
+    script = "//build/android/gyp/nocompile_test.py"
+
+    _tests = invoker.tests
+    _test0 = _tests[0]
+    _test0_dir = get_label_info(_test0["target"], "dir")
+    _test0_target_out_dir = get_label_info(_test0["target"], "target_out_dir")
+    foreach(_test_config, _tests) {
+      assert(
+          _test0_dir == get_label_info(_test_config["target"], "dir"),
+          "To avoid running 'gn gen' for each test, all tests in an android_nocompile_test_suite() should be declared in same BUILD.gn file")
+    }
+
+    deps = []
+    if (defined(invoker.deps)) {
+      deps += invoker.deps
+    }
+
+    sources = []
+    if (defined(invoker.sources)) {
+      sources += invoker.sources
+    }
+
+    # Depend on compile_java Python scripts so that the action is re-run whenever the script is
+    # modified.
+    _pydeps = [ "//build/android/gyp/compile_java.pydeps" ]
+    if (defined(invoker.pydeps)) {
+      _pydeps += invoker.pydeps
+    }
+
+    inputs = []
+    foreach(_pydeps_file, _pydeps) {
+      _pydeps_file_lines = []
+      _pydeps_file_lines = read_file(_pydeps_file, "list lines")
+      _pydeps_entries = []
+      _pydeps_entries = filter_exclude(_pydeps_file_lines, [ "#*" ])
+      _pydeps_file_dir = get_path_info(_pydeps_file, "dir")
+      inputs += rebase_path(_pydeps_entries, ".", _pydeps_file_dir)
+    }
+
+    _json_test_configs = []
+    foreach(_test_config, _tests) {
+      _test = _test_config["target"]
+      deps += [ _test ]
+      sources += _test_config["nocompile_sources"]
+      _dep_dir = get_label_info(_test, "dir")
+      _dep_name = get_label_info(_test, "name")
+      _json_test_configs += [
+        {
+          target = "${_dep_dir}:${_dep_name}"
+          expect_regex = _test_config["expected_compile_output_regex"]
+        },
+      ]
+    }
+
+    _config_path = "$target_gen_dir/${target_name}.nocompile_config"
+    write_file(_config_path, _json_test_configs, "json")
+
+    # Compute output directory for no-compile tests based on the directory containing test
+    # targets instead of based on the test suite target name. This avoids calling 'gn gen' for each
+    # android_nocompile_test_suite() for test suites whose tests are declared in the same BUILD.gn
+    # file.
+    _out_dir = "${_test0_target_out_dir}/nocompile_out"
+
+    _stamp_path = "${target_gen_dir}/${target_name}.stamp"
+    args = [
+      "--gn-args-path",
+      "args.gn",
+      "--out-dir",
+      rebase_path(_out_dir, root_build_dir),
+      "--test-configs-path",
+      rebase_path(_config_path, root_build_dir),
+      "--stamp",
+      rebase_path(_stamp_path, root_build_dir),
+    ]
+    inputs += [ _config_path ]
+    outputs = [ _stamp_path ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/android/build_vars.gni b/third_party/libwebrtc/build/config/android/build_vars.gni
new file mode 100644
index 0000000000..a47607dc7c
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/build_vars.gni
@@ -0,0 +1,29 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/android/config.gni")
+
+# Contains useful GN variables that may be used by scripts that take
+# --output-directory as an arg.
+build_vars_file = "$root_build_dir/build_vars.json"
+
+android_build_vars_json = {
+  if (enable_java_templates) {
+    android_ndk_root = rebase_path(android_ndk_root, root_build_dir)
+    android_sdk_build_tools =
+        rebase_path(android_sdk_build_tools, root_build_dir)
+    android_sdk_build_tools_version = android_sdk_build_tools_version
+    android_sdk_root = rebase_path(android_sdk_root, root_build_dir)
+    android_sdk_version = android_sdk_version
+    android_tool_prefix = rebase_path(android_tool_prefix, root_build_dir)
+    final_android_sdk = final_android_sdk
+
+    if (defined(android_secondary_abi_cpu)) {
+      android_secondary_abi_toolchain =
+          rebase_path(get_label_info(":foo($android_secondary_abi_toolchain)",
+                                     "root_out_dir"),
+                      root_build_dir)
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/android/channel.gni b/third_party/libwebrtc/build/config/android/channel.gni
new file mode 100644
index 0000000000..6348bb996e
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/channel.gni
@@ -0,0 +1,14 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  # The channel to build on Android: stable, beta, dev, canary, work, or
+  # default. "default" should be used on non-official builds.
+  android_channel = "default"
+}
+
+assert(android_channel == "default" || android_channel == "canary" ||
+           android_channel == "dev" || android_channel == "beta" ||
+           android_channel == "stable",
+       "Invalid channel: " + android_channel)
diff --git a/third_party/libwebrtc/build/config/android/config.gni b/third_party/libwebrtc/build/config/android/config.gni
new file mode 100644
index 0000000000..13418299e6
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/config.gni
@@ -0,0 +1,353 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This file contains common system config stuff for the Android build.
+
+# NOTE: Because Chrome OS builds may depend on targets built with the Android
+# toolchain, this GNI file may be read and processed from within Chrome OS
+# toolchains. Checking |is_android| here would therefore be too restrictive.
+if (is_android || is_chromeos) {
+  import("//build/config/chromecast_build.gni")
+  import("//build/config/dcheck_always_on.gni")
+  import("//build_overrides/build.gni")
+  import("abi.gni")
+
+  if (build_with_chromium) {
+    # Some non-chromium projects (e.g. WebRTC) use our build configs
+    # heavily but don't write gclient args files.
+
+    import("//build/config/gclient_args.gni")
+    if (defined(checkout_android_native_support)) {
+      n = "$0x0A"  # Newline
+      assert(checkout_android_native_support,
+             "Missing native Android toolchain support. |target_os| in your " +
+                 ".gclient configuration file (in the parent directory of " +
+                 "src) must include \"android\" and/or \"chromeos\". For " +
+                 "example:${n}${n}solutions = [${n}...${n}]${n}" +
+                 "target_os=[\"chromeos\"]${n}${n}" +
+                 "After adding |target_os| please re-run \"gclient sync\".${n}")
+    }
+  }
+
+  has_chrome_android_internal =
+      exec_script("//build/dir_exists.py",
+                  [ rebase_path("//clank", root_build_dir) ],
+                  "string") == "True"
+
+  # We are using a separate declare_args block for only this argument so that
+  # we can decide if we have to pull in definitions from the internal config
+  # early.
+  declare_args() {
+    # Enables using the internal Chrome for Android repository. The default
+    # value depends on whether the repository is available, and if it's not but
+    # this argument is manually set to True, the generation will fail.
+    # The main purpose of this argument is to avoid having to maintain 2
+    # repositories to support both public only and internal builds.
+    enable_chrome_android_internal = has_chrome_android_internal
+
+    # The default to use for android:minSdkVersion for targets that do
+    # not explicitly set it.
+    default_min_sdk_version = 21
+
+    # [WIP] Allows devs to achieve much faster edit-build-install cycles.
+    # Currently only works for ChromeModern apks due to incremental install.
+    # This needs to be in a separate declare_args as it determines some of the
+    # args in the main declare_args block below.
+    android_fast_local_dev = false
+  }
+
+  declare_args() {
+    # Android API level for 32 bits platforms
+    android32_ndk_api_level = default_min_sdk_version
+
+    # Android API level for 64 bits platforms
+    if (default_min_sdk_version < 21) {
+      android64_ndk_api_level = 21
+    } else {
+      android64_ndk_api_level = default_min_sdk_version
+    }
+  }
+
+  if (enable_chrome_android_internal) {
+    import("//clank/config.gni")
+  } else {
+    import("//build/config/android/sdk.gni")
+    declare_args() {
+      # Which Android SDK to use.
+      android_sdk_release = default_android_sdk_release
+    }
+  }
+
+  if (!defined(default_android_ndk_root)) {
+    default_android_ndk_root = "//third_party/android_ndk"
+    default_android_ndk_version = "r22"
+    default_android_ndk_major_version = 22
+  } else {
+    assert(defined(default_android_ndk_version))
+    assert(defined(default_android_ndk_major_version))
+  }
+
+  public_android_sdk_root = "//third_party/android_sdk/public"
+  if (android_sdk_release == "s") {
+    default_android_sdk_root = public_android_sdk_root
+    default_android_sdk_version = "31"
+    default_android_sdk_build_tools_version = "31.0.0"
+    public_android_sdk = true
+  }
+
+  # For use downstream when we are building with preview Android SDK
+  if (!defined(final_android_sdk)) {
+    final_android_sdk = public_android_sdk
+  }
+
+  if (!defined(default_lint_android_sdk_root)) {
+    # Purposefully repeated so that downstream can change
+    # default_android_sdk_root without changing lint version.
+    default_lint_android_sdk_root = public_android_sdk_root
+    default_lint_android_sdk_version = 31
+  }
+
+  if (!defined(default_extras_android_sdk_root)) {
+    # Purposefully repeated so that downstream can change
+    # default_android_sdk_root without changing where we load the SDK extras
+    # from. (Google Play services, etc.)
+    default_extras_android_sdk_root = public_android_sdk_root
+  }
+
+  if (!defined(default_android_keystore_path)) {
+    default_android_keystore_path = "//build/android/chromium-debug.keystore"
+    default_android_keystore_name = "chromiumdebugkey"
+    default_android_keystore_password = "chromium"
+  }
+
+  # google_play_services_package contains the path where individual client
+  # targets (e.g. google_play_services_base_java) are located.
+  if (!defined(google_play_services_package)) {
+    if (is_chromecast && chromecast_branding != "public") {
+      google_play_services_package = "//chromecast/internal/android/prebuilt/google-play-services-first-party"
+    } else {
+      google_play_services_package = "//third_party/android_deps"
+    }
+  }
+
+  if (!defined(dagger_java_target)) {
+    dagger_java_target =
+        "//third_party/android_deps:com_google_dagger_dagger_java"
+  }
+
+  if (!defined(dagger_annotation_processor_target)) {
+    dagger_annotation_processor_target =
+        "//third_party/android_deps:com_google_dagger_dagger_compiler_java"
+  }
+
+  if (!defined(guava_android_target)) {
+    guava_android_target =
+        "//third_party/android_deps:com_google_guava_guava_android_java"
+  }
+
+  if (!defined(material_design_target)) {
+    material_design_target =
+        "//third_party/android_deps:com_google_android_material_material_java"
+  }
+
+  if (!defined(android_protoc_bin)) {
+    android_protoc_bin = "//third_party/android_protoc/protoc"
+    android_proto_runtime =
+        "//third_party/android_deps:com_google_protobuf_protobuf_javalite_java"
+  }
+
+  webview_public_framework_dep =
+      "//third_party/android_sdk:public_framework_system_java"
+  if (!defined(webview_framework_dep)) {
+    webview_framework_dep = webview_public_framework_dep
+  }
+
+  assert(defined(default_android_sdk_root),
+         "SDK release " + android_sdk_release + " not recognized.")
+
+  declare_args() {
+    android_ndk_root = default_android_ndk_root
+    android_ndk_version = default_android_ndk_version
+    android_ndk_major_version = default_android_ndk_major_version
+
+    android_sdk_root = default_android_sdk_root
+    android_sdk_version = default_android_sdk_version
+    android_sdk_build_tools_version = default_android_sdk_build_tools_version
+
+    lint_android_sdk_root = default_lint_android_sdk_root
+    lint_android_sdk_version = default_lint_android_sdk_version
+
+    # Libc++ library directory. Override to use a custom libc++ binary.
+    android_libcpp_lib_dir = ""
+
+    # Android versionCode for android_apk()s that don't explicitly set one.
+    android_default_version_code = "1"
+
+    # Android versionName for android_apk()s that don't explicitly set one.
+    android_default_version_name = "Developer Build"
+
+    # Forced Android versionCode
+    android_override_version_code = ""
+
+    # Forced Android versionName
+    android_override_version_name = ""
+
+    # The path to the keystore to use for signing builds.
+    android_keystore_path = default_android_keystore_path
+
+    # The name of the keystore to use for signing builds.
+    android_keystore_name = default_android_keystore_name
+
+    # The password for the keystore to use for signing builds.
+    android_keystore_password = default_android_keystore_password
+
+    # Java debug on Android. Having this on enables multidexing, and turning it
+    # off will enable proguard.
+    is_java_debug = is_debug
+
+    # Mark APKs as android:debuggable="true".
+    debuggable_apks = !is_official_build
+
+    # Set to false to disable the Errorprone compiler.
+    # Defaults to false for official builds to reduce build times.
+    # Static analysis failures should have been already caught by normal bots.
+    # Disabled when fast_local_dev is turned on.
+    use_errorprone_java_compiler = !is_official_build && !android_fast_local_dev
+
+    # Build incremental targets whenever possible.
+    # See //build/android/incremental_install/README.md for more details.
+    incremental_install = android_fast_local_dev
+
+    # When true, updates all android_aar_prebuilt() .info files during gn gen.
+    # Refer to android_aar_prebuilt() for more details.
+    update_android_aar_prebuilts = false
+
+    # Turns off android lint. Useful for prototyping or for faster local builds.
+    # Defaults to true for official builds to reduce build times.
+    # Static analysis failures should have been already caught by normal bots.
+    # Disabled when fast_local_dev is turned on.
+    disable_android_lint = is_official_build || android_fast_local_dev
+
+    # Location of aapt2 used for app bundles. For now, a more recent version
+    # than the one distributed with the Android SDK is required.
+    android_sdk_tools_bundle_aapt2_dir =
+        "//third_party/android_build_tools/aapt2"
+
+    # Causes expectation failures to break the build, otherwise, just warns on
+    # stderr and writes a failure file to $android_configuration_failure_dir:
+    fail_on_android_expectations = false
+
+    # Controls whether proguard obfuscation is enabled for targets
+    # configured to use it.
+    enable_proguard_obfuscation = true
+
+    # Controls whether |short_resource_paths| and |strip_resource_names| are
+    # respected. Useful when trying to analyze APKs using tools that do not
+    # support mapping these names.
+    enable_arsc_obfuscation = true
+
+    # The target to use as the system WebView implementation.
+    if (android_64bit_target_cpu && skip_secondary_abi_for_cq) {
+      system_webview_apk_target = "//android_webview:system_webview_64_apk"
+    } else {
+      system_webview_apk_target = "//android_webview:system_webview_apk"
+    }
+
+    # Where to write failed expectations for bots to read.
+    expectations_failure_dir = "$root_build_dir/failed_expectations"
+  }
+
+  # We need a second declare_args block to make sure we are using the overridden
+  # value of the arguments set above.
+  declare_args() {
+    if (defined(default_android_sdk_platform_version)) {
+      android_sdk_platform_version = default_android_sdk_platform_version
+    } else {
+      android_sdk_platform_version = android_sdk_version
+    }
+
+    # Whether java assertions and Preconditions checks are enabled.
+    enable_java_asserts = is_java_debug || dcheck_always_on
+
+    # Reduce build time by using d8 incremental build.
+    enable_incremental_d8 = true
+
+    # Use hashed symbol names to reduce JNI symbol overhead.
+    use_hashed_jni_names = !is_java_debug
+
+    # Enables Java library desugaring.
+    # This will cause an extra classes.dex file to appear in every apk.
+    enable_jdk_library_desugaring = true
+  }
+
+  # Host stuff -----------------------------------------------------------------
+
+  # Defines the name the Android build gives to the current host CPU
+  # architecture, which is different than the names GN uses.
+  if (host_cpu == "x64") {
+    android_host_arch = "x86_64"
+  } else if (host_cpu == "x86") {
+    android_host_arch = "x86"
+  } else {
+    assert(false, "Need Android toolchain support for your build CPU arch.")
+  }
+
+  # Defines the name the Android build gives to the current host CPU
+  # architecture, which is different than the names GN uses.
+  if (host_os == "linux") {
+    android_host_os = "linux"
+  } else if (host_os == "mac") {
+    android_host_os = "darwin"
+  } else {
+    assert(false, "Need Android toolchain support for your build OS.")
+  }
+
+  # Directories and files ------------------------------------------------------
+  #
+  # We define may of the dirs strings here for each output architecture (rather
+  # than just the current one) since these are needed by the Android toolchain
+  # file to define toolchains for all possible targets in one pass.
+
+  android_sdk =
+      "${android_sdk_root}/platforms/android-${android_sdk_platform_version}"
+  android_sdk_build_tools =
+      "${android_sdk_root}/build-tools/$android_sdk_build_tools_version"
+
+  # Path to the SDK's android.jar
+  android_sdk_jar = "$android_sdk/android.jar"
+
+  # Location of libgcc. This is only needed for the current GN toolchain, so we
+  # only need to define the current one, rather than one for every platform
+  # like the toolchain roots.
+  if (target_cpu == "x86") {
+    android_prebuilt_arch = "android-x86"
+    _binary_prefix = "i686-linux-android"
+  } else if (target_cpu == "arm") {
+    android_prebuilt_arch = "android-arm"
+    _binary_prefix = "arm-linux-androideabi"
+  } else if (target_cpu == "mipsel") {
+    android_prebuilt_arch = "android-mips"
+    _binary_prefix = "mipsel-linux-android"
+  } else if (target_cpu == "x64") {
+    android_prebuilt_arch = "android-x86_64"
+    _binary_prefix = "x86_64-linux-android"
+  } else if (target_cpu == "arm64") {
+    android_prebuilt_arch = "android-arm64"
+    _binary_prefix = "aarch64-linux-android"
+  } else if (target_cpu == "mips64el") {
+    android_prebuilt_arch = "android-mips64"
+    _binary_prefix = "mips64el-linux-android"
+  } else {
+    assert(false, "Need android libgcc support for your target arch.")
+  }
+
+  android_toolchain_root = "$android_ndk_root/toolchains/llvm/prebuilt/${android_host_os}-${android_host_arch}"
+  android_tool_prefix = "$android_toolchain_root/bin/$_binary_prefix-"
+  android_readelf = "${android_tool_prefix}readelf"
+  android_objcopy = "${android_tool_prefix}objcopy"
+  android_gdbserver =
+      "$android_ndk_root/prebuilt/$android_prebuilt_arch/gdbserver/gdbserver"
+
+  android_sdk_tools_bundle_aapt2 = "${android_sdk_tools_bundle_aapt2_dir}/aapt2"
+}
diff --git a/third_party/libwebrtc/build/config/android/copy_ex.gni b/third_party/libwebrtc/build/config/android/copy_ex.gni
new file mode 100644
index 0000000000..d3705dd7ef
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/copy_ex.gni
@@ -0,0 +1,72 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# Copy a list of file into a destination directory. Potentially renaming
+# files are they are copied. This also ensures that symlinks are followed
+# during the copy (i.e. the symlinks are never copied, only their content).
+#
+# Variables:
+#  dest: Destination directory path.
+#  sources: List of source files or directories to copy to dest.
+#  renaming_sources: Optional list of source file paths that will be renamed
+#    during the copy operation. If provided, renaming_destinations is required.
+#  renaming_destinations: Optional list of destination file paths, required
+#    when renaming_sources is provided. Both lists should have the same size
+#    and matching entries.
+#  args: Optional. Additionnal arguments to the copy_ex.py script.
+#
+#  The following variables have the usual GN meaning: data, deps, inputs,
+#  outputs, testonly, visibility.
+
+import("//build/config/python.gni")
+
+template("copy_ex") {
+  action_with_pydeps(target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "data",
+                             "deps",
+                             "public_deps",
+                             "testonly",
+                             "visibility",
+                           ])
+    sources = []
+    if (defined(invoker.sources)) {
+      sources += invoker.sources
+    }
+    outputs = []
+    if (defined(invoker.outputs)) {
+      outputs += invoker.outputs
+    }
+    if (defined(invoker.inputs)) {
+      inputs = invoker.inputs
+    }
+
+    script = "//build/android/gyp/copy_ex.py"
+
+    args = [
+      "--dest",
+      rebase_path(invoker.dest, root_build_dir),
+    ]
+    rebased_sources = rebase_path(sources, root_build_dir)
+    args += [ "--files=$rebased_sources" ]
+
+    if (defined(invoker.args)) {
+      args += invoker.args
+    }
+
+    if (defined(invoker.renaming_sources) &&
+        defined(invoker.renaming_destinations)) {
+      sources += invoker.renaming_sources
+      renaming_destinations = invoker.renaming_destinations
+      outputs +=
+          get_path_info(rebase_path(renaming_destinations, ".", invoker.dest),
+                        "abspath")
+      rebased_renaming_sources =
+          rebase_path(invoker.renaming_sources, root_build_dir)
+      args += [ "--renaming-sources=$rebased_renaming_sources" ]
+      args += [ "--renaming-destinations=$renaming_destinations" ]
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/android/extract_unwind_tables.gni b/third_party/libwebrtc/build/config/android/extract_unwind_tables.gni
new file mode 100644
index 0000000000..5444c5b972
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/extract_unwind_tables.gni
@@ -0,0 +1,44 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/android/rules.gni")
+
+template("unwind_table_asset") {
+  # Note: This file name is used in multiple monochrome build scripts.
+  _asset_path = "${target_gen_dir}/${target_name}/unwind_cfi_32"
+  _unwind_action = "${target_name}__extract"
+
+  action(_unwind_action) {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+    _root_dir = "$root_out_dir"
+    if (defined(android_secondary_abi_cpu)) {
+      _root_dir = get_label_info(":foo($android_secondary_abi_toolchain)",
+                                 "root_out_dir")
+    }
+
+    script = "//build/android/gyp/extract_unwind_tables.py"
+    outputs = [ _asset_path ]
+    inputs = [ "${_root_dir}/lib.unstripped/$shlib_prefix${invoker.library_target}$shlib_extension" ]
+
+    args = [
+      "--input_path",
+      rebase_path(
+          "${_root_dir}/lib.unstripped/$shlib_prefix${invoker.library_target}$shlib_extension",
+          root_build_dir),
+      "--output_path",
+      rebase_path(_asset_path, root_build_dir),
+      "--dump_syms_path",
+      rebase_path("$root_out_dir/dump_syms", root_build_dir),
+    ]
+    deps = invoker.deps
+    deps += [ "//third_party/breakpad:dump_syms" ]
+  }
+  android_assets(target_name) {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    sources = [ _asset_path ]
+    disable_compression = true
+    deps = [ ":$_unwind_action" ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/android/internal_rules.gni b/third_party/libwebrtc/build/config/android/internal_rules.gni
new file mode 100644
index 0000000000..3ed306a9e7
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/internal_rules.gni
@@ -0,0 +1,4368 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Do not add any imports to non-//build directories here.
+# Some projects (e.g. V8) do not have non-build directories DEPS'ed in.
+import("//build/config/android/config.gni")
+import("//build/config/android/copy_ex.gni")
+import("//build/config/compiler/compiler.gni")
+import("//build/config/compute_inputs_for_analyze.gni")
+import("//build/config/coverage/coverage.gni")
+import("//build/config/python.gni")
+import("//build/config/sanitizers/sanitizers.gni")
+import("//build/toolchain/goma.gni")
+import("//build/toolchain/kythe.gni")
+import("//build/util/generate_wrapper.gni")
+import("//build_overrides/build.gni")
+if (current_toolchain == default_toolchain) {
+  import("//build/toolchain/concurrent_links.gni")
+}
+assert(is_android)
+
+# The following _java_*_types variables capture all the existing target types.
+# If a new type is introduced, please add it to one of these categories,
+# preferring the more specific resource/library types.
+_java_resource_types = [
+  "android_assets",
+  "android_resources",
+]
+
+_java_library_types = [
+  "java_library",
+  "system_java_library",
+  "android_app_bundle_module",
+]
+
+# These are leaf java target types. They cannot be passed as deps to other
+# targets. Thus their naming schemes are not enforced.
+_java_leaf_types = [
+  "android_apk",
+  "android_app_bundle",
+  "dist_aar",
+  "dist_jar",
+  "java_annotation_processor",
+  "java_binary",
+  "junit_binary",
+]
+
+# All _java_resource_types targets must conform to these patterns.
+_java_resource_patterns = [
+  "*:*_assets",
+  "*android*:assets",
+  "*:*_apk_*resources",
+  "*android*:resources",
+  "*:*_resources",
+  "*:*_grd",
+  "*:*locale_paks",
+  "*:*_java_strings",
+  "*:*strings_java",
+]
+
+# All _java_library_types targets must conform to these patterns. This includes
+# all non-leaf targets that use java_library_impl.
+_java_library_patterns = [
+  "*:*_java",
+  "*:*_javalib",
+  "*:*_java_*",  # e.g. chrome_java_test_support
+  "*:java",
+  "*:junit",
+  "*:junit_*",
+  "*:*_junit_*",
+  "*:*javatests",
+  "*:*_bundle_module",
+
+  # TODO(agrieve): Rename targets below to match above patterns.
+  "//android_webview/glue:glue",
+]
+
+# These identify all non-leaf targets that have .build_config.json files. This is the
+# set of patterns that other targets can use to filter out java targets.
+java_target_patterns = _java_library_patterns + _java_resource_patterns
+
+_r8_path = "//third_party/r8/lib/r8.jar"
+_custom_d8_path = "//third_party/r8/custom_d8.jar"
+_desugar_jdk_libs_json = "//third_party/r8/desugar_jdk_libs.json"
+_desugar_jdk_libs_jar = "//third_party/android_deps/libs/com_android_tools_desugar_jdk_libs/desugar_jdk_libs-1.1.1.jar"
+_desugar_jdk_libs_configuration_jar = "//third_party/android_deps/libs/com_android_tools_desugar_jdk_libs_configuration/desugar_jdk_libs_configuration-1.1.1.jar"
+_desugar_runtime_jar = "$root_build_dir/obj/third_party/bazel/desugar/Desugar_runtime.processed.jar"
+
+_dexdump_path = "$android_sdk_build_tools/dexdump"
+_dexlayout_path = "//third_party/android_build_tools/art/dexlayout"
+_profman_path = "//third_party/android_build_tools/art/profman"
+_art_lib_file_names = [
+  "libartbase.so",
+  "libart-compiler.so",
+  "libart-dexlayout.so",
+  "libart-disassembler.so",
+  "libart-gtest.so",
+  "libart.so",
+  "libbacktrace.so",
+  "libbase.so",
+  "libcrypto-host.so",
+  "libc++.so",
+  "libcutils.so",
+  "libdexfile.so",
+  "libexpat-host.so",
+  "libicui18n-host.so",
+  "libicuuc-host.so",
+  "libjavacore.so",
+  "libjavacrypto.so",
+  "liblog.so",
+  "liblz4.so",
+  "liblzma.so",
+  "libnativebridge.so",
+  "libnativehelper.so",
+  "libnativeloader.so",
+  "libopenjdkjvm.so",
+  "libopenjdkjvmti.so",
+  "libopenjdk.so",
+  "libprofile.so",
+  "libsigchain.so",
+  "libssl-host.so",
+  "libunwindstack.so",
+  "libvixl-arm64.so",
+  "libvixl-arm.so",
+  "libvixld-arm64.so",
+  "libvixld-arm.so",
+  "libz-host.so",
+  "libziparchive.so",
+  "slicer.so",
+]
+_default_art_libs = []
+foreach(lib, _art_lib_file_names) {
+  _default_art_libs += [ "//third_party/android_build_tools/art/lib/$lib" ]
+}
+
+# Put the bug number in the target name so that false-positives have a hint in
+# the error message about why non-existent dependencies are there.
+build_config_target_suffix = "__build_config_crbug_908819"
+
+# Write the target's .build_config.json file. This is a json file that contains a
+# dictionary of information about how to build this target (things that
+# require knowledge about this target's dependencies and cannot be calculated
+# at gn-time). There is a special syntax to add a value in that dictionary to
+# an action/action_foreachs args:
+#   --python-arg=@FileArg($rebased_build_config_path:key0:key1)
+# At runtime, such an arg will be replaced by the value in the build_config.
+# See build/android/gyp/write_build_config.py and
+# build/android/gyp/util/build_utils.py:ExpandFileArgs
+template("write_build_config") {
+  _type = invoker.type
+  _parent_invoker = invoker.invoker
+  _target_label =
+      get_label_info(":${_parent_invoker.target_name}", "label_no_toolchain")
+
+  # Ensure targets match naming patterns so that __assetres, __header, __impl
+  # targets work properly. Those generated targets allow for effective deps
+  # filtering.
+  if (filter_exclude([ _type ], _java_resource_types) == []) {
+    if (filter_exclude([ _target_label ], _java_resource_patterns) != []) {
+      assert(false, "Invalid java resource target name: $_target_label")
+    }
+  } else if (filter_exclude([ _type ], _java_library_types) == []) {
+    if (filter_exclude([ _target_label ], _java_library_patterns) != [] ||
+        filter_exclude([ _target_label ], _java_resource_patterns) == []) {
+      assert(false, "Invalid java library target name: $_target_label")
+    }
+  } else if (_type == "group") {
+    if (filter_exclude([ _target_label ], java_target_patterns) != []) {
+      assert(false, "Invalid java target name: $_target_label")
+    }
+  } else if (filter_exclude([ _type ], _java_leaf_types) != []) {
+    assert(false, "This java type needs a category: $_type")
+  }
+
+  if (defined(invoker.public_target_label)) {
+    _target_label = invoker.public_target_label
+  }
+
+  action_with_pydeps(target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "deps",
+                             "testonly",
+                           ])
+    if (!defined(deps)) {
+      deps = []
+    }
+    if (defined(invoker.android_manifest_dep)) {
+      deps += [ invoker.android_manifest_dep ]
+    }
+
+    script = "//build/android/gyp/write_build_config.py"
+    depfile = "$target_gen_dir/$target_name.d"
+    inputs = []
+    outputs = [ invoker.build_config ]
+
+    _deps_configs = []
+    _public_deps_configs = []
+    if (defined(invoker.possible_config_deps)) {
+      foreach(_possible_dep, invoker.possible_config_deps) {
+        _dep_label = get_label_info(_possible_dep, "label_no_toolchain")
+        if (filter_exclude([ _dep_label ], java_target_patterns) == []) {
+          # Put the bug number in the target name so that false-positives
+          # have a hint in the error message about non-existent dependencies.
+          deps += [ "$_dep_label$build_config_target_suffix" ]
+          _dep_gen_dir = get_label_info(_possible_dep, "target_gen_dir")
+          _dep_name = get_label_info(_possible_dep, "name")
+          _dep_config = "$_dep_gen_dir/$_dep_name.build_config.json"
+
+          _deps_configs += [ _dep_config ]
+          if (defined(invoker.possible_config_public_deps)) {
+            if (filter_include([ _possible_dep ],
+                               invoker.possible_config_public_deps) != []) {
+              _public_deps_configs += [ _dep_config ]
+            }
+          }
+        }
+      }
+    }
+    _rebased_deps_configs = rebase_path(_deps_configs, root_build_dir)
+    _rebased_public_deps_configs =
+        rebase_path(_public_deps_configs, root_build_dir)
+
+    args = [
+      "--type=$_type",
+      "--depfile",
+      rebase_path(depfile, root_build_dir),
+      "--deps-configs=$_rebased_deps_configs",
+      "--public-deps-configs=$_rebased_public_deps_configs",
+      "--build-config",
+      rebase_path(invoker.build_config, root_build_dir),
+      "--gn-target",
+      _target_label,
+    ]
+
+    if (defined(invoker.ignore_dependency_public_deps) &&
+        invoker.ignore_dependency_public_deps) {
+      args += [ "--ignore-dependency-public-deps" ]
+    }
+
+    if (defined(invoker.aar_path)) {
+      args += [
+        "--aar-path",
+        rebase_path(invoker.aar_path, root_build_dir),
+      ]
+    }
+
+    if (defined(invoker.chromium_code) && !invoker.chromium_code) {
+      # Default to chromium code if invoker did not pass anything.
+      args += [ "--non-chromium-code" ]
+    }
+
+    if (defined(invoker.device_jar_path)) {
+      args += [
+        "--device-jar-path",
+        rebase_path(invoker.device_jar_path, root_build_dir),
+      ]
+    }
+    if (defined(invoker.host_jar_path)) {
+      args += [
+        "--host-jar-path",
+        rebase_path(invoker.host_jar_path, root_build_dir),
+      ]
+    }
+    if (defined(invoker.unprocessed_jar_path)) {
+      args += [
+        "--unprocessed-jar-path",
+        rebase_path(invoker.unprocessed_jar_path, root_build_dir),
+      ]
+    }
+    if (defined(invoker.ijar_path)) {
+      args += [
+        "--interface-jar-path",
+        rebase_path(invoker.ijar_path, root_build_dir),
+      ]
+    }
+    if (defined(invoker.java_resources_jar)) {
+      args += [
+        "--java-resources-jar-path",
+        rebase_path(invoker.java_resources_jar, root_build_dir),
+      ]
+    }
+    if (defined(invoker.annotation_processor_deps) &&
+        invoker.annotation_processor_deps != []) {
+      _processor_configs = []
+      foreach(_processor_dep, invoker.annotation_processor_deps) {
+        _dep_label = get_label_info(_processor_dep, "label_no_toolchain")
+        _dep_gen_dir = get_label_info(_processor_dep, "target_gen_dir")
+        _dep_name = get_label_info(_processor_dep, "name")
+        deps += [ "$_dep_label$build_config_target_suffix" ]
+        _processor_configs += [ "$_dep_gen_dir/$_dep_name.build_config.json" ]
+      }
+      _rebased_processor_configs =
+          rebase_path(_processor_configs, root_build_dir)
+      args += [ "--annotation-processor-configs=$_rebased_processor_configs" ]
+    }
+
+    # Dex path for library targets, or the the intermediate library for apks.
+    if (defined(invoker.dex_path)) {
+      args += [
+        "--dex-path",
+        rebase_path(invoker.dex_path, root_build_dir),
+      ]
+    }
+
+    # Dex path for the final apk.
+    if (defined(invoker.final_dex_path)) {
+      args += [
+        "--final-dex-path",
+        rebase_path(invoker.final_dex_path, root_build_dir),
+      ]
+    }
+    if (defined(invoker.supports_android) && invoker.supports_android) {
+      args += [ "--supports-android" ]
+    }
+    if (defined(invoker.requires_android) && invoker.requires_android) {
+      args += [ "--requires-android" ]
+    }
+    if (defined(invoker.is_prebuilt) && invoker.is_prebuilt) {
+      args += [ "--is-prebuilt" ]
+    }
+    if (defined(invoker.bypass_platform_checks) &&
+        invoker.bypass_platform_checks) {
+      args += [ "--bypass-platform-checks" ]
+    }
+
+    if (defined(invoker.apk_under_test)) {
+      deps += [ "${invoker.apk_under_test}$build_config_target_suffix" ]
+      apk_under_test_gen_dir =
+          get_label_info(invoker.apk_under_test, "target_gen_dir")
+      apk_under_test_name = get_label_info(invoker.apk_under_test, "name")
+      apk_under_test_config =
+          "$apk_under_test_gen_dir/$apk_under_test_name.build_config.json"
+      args += [
+        "--tested-apk-config",
+        rebase_path(apk_under_test_config, root_build_dir),
+      ]
+    }
+
+    if (defined(invoker.asset_sources)) {
+      _rebased_asset_sources =
+          rebase_path(invoker.asset_sources, root_build_dir)
+      args += [ "--asset-sources=$_rebased_asset_sources" ]
+    }
+    if (defined(invoker.asset_renaming_sources)) {
+      _rebased_asset_renaming_sources =
+          rebase_path(invoker.asset_renaming_sources, root_build_dir)
+      args += [ "--asset-renaming-sources=$_rebased_asset_renaming_sources" ]
+
+      # These are zip paths, so no need to rebase.
+      args += [
+        "--asset-renaming-destinations=${invoker.asset_renaming_destinations}",
+      ]
+    }
+    if (defined(invoker.disable_compression) && invoker.disable_compression) {
+      args += [ "--disable-asset-compression" ]
+    }
+    if (defined(invoker.treat_as_locale_paks) && invoker.treat_as_locale_paks) {
+      args += [ "--treat-as-locale-paks" ]
+    }
+
+    if (defined(invoker.merged_android_manifest)) {
+      args += [
+        "--merged-android-manifest",
+        rebase_path(invoker.merged_android_manifest, root_build_dir),
+      ]
+    }
+    if (defined(invoker.android_manifest)) {
+      inputs += [ invoker.android_manifest ]
+      args += [
+        "--android-manifest",
+        rebase_path(invoker.android_manifest, root_build_dir),
+      ]
+    }
+    if (defined(invoker.resources_zip)) {
+      args += [
+        "--resources-zip",
+        rebase_path(invoker.resources_zip, root_build_dir),
+      ]
+    }
+
+    if (defined(invoker.resource_overlay) && invoker.resource_overlay) {
+      args += [ "--resource-overlay" ]
+    }
+
+    if (defined(invoker.custom_package)) {
+      args += [
+        "--package-name",
+        invoker.custom_package,
+      ]
+    }
+    if (defined(invoker.r_text)) {
+      args += [
+        "--r-text-path",
+        rebase_path(invoker.r_text, root_build_dir),
+      ]
+    }
+    if (defined(invoker.res_size_info_path)) {
+      args += [
+        "--res-size-info",
+        rebase_path(invoker.res_size_info_path, root_build_dir),
+      ]
+    }
+    if (defined(invoker.res_sources_path)) {
+      _res_sources_path = rebase_path(invoker.res_sources_path, root_build_dir)
+      args += [ "--res-sources-path=$_res_sources_path" ]
+    }
+    if (defined(invoker.proto_resources_path)) {
+      _rebased_proto_resources =
+          rebase_path(invoker.proto_resources_path, root_build_dir)
+      args += [ "--apk-proto-resources=$_rebased_proto_resources" ]
+    }
+    if (defined(invoker.r_text_path)) {
+      _rebased_rtxt_path = rebase_path(invoker.r_text_path, root_build_dir)
+      args += [ "--r-text-path=$_rebased_rtxt_path" ]
+    }
+    if (defined(invoker.module_pathmap_path)) {
+      _rebased_pathmap_path =
+          rebase_path(invoker.module_pathmap_path, root_build_dir)
+      args += [ "--module-pathmap-path=$_rebased_pathmap_path" ]
+    }
+
+    if (defined(invoker.shared_libraries_runtime_deps_file)) {
+      # Don't list shared_libraries_runtime_deps_file as an input in order to
+      # avoid having to depend on the runtime_deps target. See comment in
+      # rules.gni for why we do this.
+      args += [
+        "--shared-libraries-runtime-deps",
+        rebase_path(invoker.shared_libraries_runtime_deps_file, root_build_dir),
+      ]
+    }
+
+    if (defined(invoker.base_allowlist_rtxt_path)) {
+      args += [
+        "--base-allowlist-rtxt-path",
+        rebase_path(invoker.base_allowlist_rtxt_path, root_build_dir),
+      ]
+    }
+
+    if (defined(invoker.is_base_module) && invoker.is_base_module) {
+      args += [ "--is-base-module" ]
+    }
+
+    if (defined(invoker.loadable_modules)) {
+      _rebased_loadable_modules =
+          rebase_path(invoker.loadable_modules, root_build_dir)
+      args += [ "--loadable-modules=$_rebased_loadable_modules" ]
+    }
+
+    if (defined(invoker.secondary_abi_shared_libraries_runtime_deps_file)) {
+      # Don't list secondary_abi_shared_libraries_runtime_deps_file as an
+      # input in order to avoid having to depend on the runtime_deps target.
+      # See comment in rules.gni for why we do this.
+      args += [
+        "--secondary-abi-shared-libraries-runtime-deps",
+        rebase_path(invoker.secondary_abi_shared_libraries_runtime_deps_file,
+                    root_build_dir),
+      ]
+    }
+
+    if (defined(invoker.secondary_abi_loadable_modules) &&
+        invoker.secondary_abi_loadable_modules != []) {
+      _rebased_secondary_abi_loadable_modules =
+          rebase_path(invoker.secondary_abi_loadable_modules, root_build_dir)
+      args += [ "--secondary-abi-loadable-modules=$_rebased_secondary_abi_loadable_modules" ]
+    }
+
+    if (defined(invoker.native_lib_placeholders) &&
+        invoker.native_lib_placeholders != []) {
+      args += [ "--native-lib-placeholders=${invoker.native_lib_placeholders}" ]
+    }
+
+    if (defined(invoker.secondary_native_lib_placeholders) &&
+        invoker.secondary_native_lib_placeholders != []) {
+      args += [ "--secondary-native-lib-placeholders=${invoker.secondary_native_lib_placeholders}" ]
+    }
+
+    if (defined(invoker.uncompress_shared_libraries) &&
+        invoker.uncompress_shared_libraries) {
+      args += [ "--uncompress-shared-libraries" ]
+    }
+
+    if (defined(invoker.library_always_compress)) {
+      args += [ "--library-always-compress=${invoker.library_always_compress}" ]
+    }
+
+    if (defined(invoker.library_renames)) {
+      args += [ "--library-renames=${invoker.library_renames}" ]
+    }
+
+    if (defined(invoker.apk_path)) {
+      # TODO(tiborg): Remove APK path from build config and use
+      # install_artifacts from metadata instead.
+      _rebased_apk_path = rebase_path(invoker.apk_path, root_build_dir)
+      args += [ "--apk-path=$_rebased_apk_path" ]
+      if (defined(invoker.incremental_apk_path)) {
+        _rebased_incremental_apk_path =
+            rebase_path(invoker.incremental_apk_path, root_build_dir)
+        _rebased_incremental_install_json_path =
+            rebase_path(invoker.incremental_install_json_path, root_build_dir)
+        args += [
+          "--incremental-install-json-path=$_rebased_incremental_install_json_path",
+          "--incremental-apk-path=$_rebased_incremental_apk_path",
+        ]
+      }
+    }
+
+    if (defined(invoker.java_sources_file)) {
+      args += [
+        "--java-sources-file",
+        rebase_path(invoker.java_sources_file, root_build_dir),
+      ]
+    }
+    if (defined(invoker.srcjar)) {
+      args += [
+        "--srcjar",
+        rebase_path(invoker.srcjar, root_build_dir),
+      ]
+    }
+    if (defined(invoker.bundled_srcjars)) {
+      _rebased_bundled_srcjars =
+          rebase_path(invoker.bundled_srcjars, root_build_dir)
+      args += [ "--bundled-srcjars=$_rebased_bundled_srcjars" ]
+    }
+    if (defined(invoker.proguard_enabled) && invoker.proguard_enabled) {
+      args += [ "--proguard-enabled" ]
+    }
+    if (defined(invoker.proguard_mapping_path)) {
+      _rebased_proguard_mapping_path =
+          rebase_path(invoker.proguard_mapping_path, root_build_dir)
+      args += [ "--proguard-mapping-path=$_rebased_proguard_mapping_path" ]
+    }
+    if (defined(invoker.input_jars_paths)) {
+      _rebased_input_jars_paths =
+          rebase_path(invoker.input_jars_paths, root_build_dir)
+      args += [ "--extra-classpath-jars=$_rebased_input_jars_paths" ]
+    }
+    if (defined(invoker.low_classpath_priority) &&
+        invoker.low_classpath_priority) {
+      args += [ "--low-classpath-priority" ]
+    }
+    if (defined(invoker.mergeable_android_manifests)) {
+      _rebased_mergeable_android_manifests =
+          rebase_path(invoker.mergeable_android_manifests, root_build_dir)
+      args += [
+        "--mergeable-android-manifests=$_rebased_mergeable_android_manifests",
+      ]
+    }
+    if (defined(invoker.proguard_configs)) {
+      _rebased_proguard_configs =
+          rebase_path(invoker.proguard_configs, root_build_dir)
+      args += [ "--proguard-configs=$_rebased_proguard_configs" ]
+    }
+    if (defined(invoker.static_library_dependent_targets)) {
+      _dependent_configs = []
+      foreach(_dep, invoker.static_library_dependent_targets) {
+        _dep_name = _dep.name
+        _dep_label = get_label_info(_dep_name, "label_no_toolchain")
+        deps += [ "$_dep_label$build_config_target_suffix" ]
+        _dep_gen_dir = get_label_info(_dep_name, "target_gen_dir")
+        _dep_name = get_label_info(_dep_name, "name")
+        _config = rebase_path("$_dep_gen_dir/$_dep_name.build_config.json",
+                              root_build_dir)
+        _dependent_configs += [ _config ]
+      }
+      args += [ "--static-library-dependent-configs=$_dependent_configs" ]
+    }
+    if (defined(invoker.gradle_treat_as_prebuilt) &&
+        invoker.gradle_treat_as_prebuilt) {
+      args += [ "--gradle-treat-as-prebuilt" ]
+    }
+    if (defined(invoker.main_class)) {
+      args += [
+        "--main-class",
+        invoker.main_class,
+      ]
+    }
+    if (defined(invoker.base_module_target)) {
+      _base_label =
+          get_label_info(invoker.base_module_target, "label_no_toolchain")
+      _dep_gen_dir = get_label_info(_base_label, "target_gen_dir")
+      _dep_name = get_label_info(_base_label, "name")
+      deps += [ "$_base_label$build_config_target_suffix" ]
+      _base_module_build_config = "$_dep_gen_dir/$_dep_name.build_config.json"
+      inputs += [ _base_module_build_config ]
+      args += [
+        "--base-module-build-config",
+        rebase_path(_base_module_build_config, root_build_dir),
+      ]
+    }
+    if (defined(invoker.module_build_configs)) {
+      inputs += invoker.module_build_configs
+      _rebased_configs =
+          rebase_path(invoker.module_build_configs, root_build_dir)
+      args += [ "--module-build-configs=$_rebased_configs" ]
+    }
+    if (defined(invoker.version_name)) {
+      args += [
+        "--version-name",
+        invoker.version_name,
+      ]
+    }
+    if (defined(invoker.version_code)) {
+      args += [
+        "--version-code",
+        invoker.version_code,
+      ]
+    }
+    if (defined(invoker.recursive_resource_deps) &&
+        invoker.recursive_resource_deps) {
+      args += [ "--recursive-resource-deps" ]
+    }
+    if (current_toolchain != default_toolchain) {
+      # This has to be a built-time error rather than a GN assert because many
+      # packages have a mix of java and non-java targets. For example, the
+      # following would fail even though nothing depends on :bar(//baz):
+      #
+      # shared_library("foo") {
+      # }
+      #
+      # android_library("bar") {
+      #   deps = [ ":foo(//baz)" ]
+      #   assert(current_toolchain == default_toolchain)
+      # }
+      _msg = [
+        "Tried to build an Android target in a non-default toolchain.",
+        "target: $_target_label",
+        "current_toolchain: $current_toolchain",
+        "default_toolchain: $default_toolchain",
+      ]
+      args += [ "--fail=$_msg" ]
+    }
+  }
+}
+
+template("generate_android_wrapper") {
+  generate_wrapper(target_name) {
+    forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    generator_script = "//build/android/gyp/generate_android_wrapper.py"
+    sources = [
+      "//build/android/gyp/util/build_utils.py",
+      "//build/gn_helpers.py",
+      "//build/util/generate_wrapper.py",
+    ]
+  }
+}
+
+template("generate_r_java") {
+  action_with_pydeps(target_name) {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "deps" ])
+    if (!defined(deps)) {
+      deps = []
+    }
+    if (defined(invoker.possible_resource_deps)) {
+      foreach(_dep, invoker.possible_resource_deps) {
+        _target_label = get_label_info(_dep, "label_no_toolchain")
+        if (filter_exclude([ _target_label ], _java_library_patterns) == [] &&
+            filter_exclude([ _target_label ], _java_resource_patterns) != []) {
+          # Depend on the java libraries' transitive __assetres target instead.
+          # This is required to ensure depending on java_groups works.
+          deps += [ "${_target_label}__assetres" ]
+        } else {
+          deps += [ _dep ]
+        }
+      }
+    }
+    depfile = "$target_gen_dir/${invoker.target_name}.d"
+    inputs = [ invoker.build_config ]
+    outputs = [ invoker.srcjar_path ]
+    _rebased_build_config = rebase_path(invoker.build_config, root_build_dir)
+    script = "//build/android/gyp/create_r_java.py"
+    args = [
+      "--depfile",
+      rebase_path(depfile, root_build_dir),
+      "--srcjar-out",
+      rebase_path(invoker.srcjar_path, root_build_dir),
+      "--deps-rtxts=@FileArg($_rebased_build_config:deps_info:dependency_r_txt_files)",
+      "--r-package=${invoker.package}",
+    ]
+  }
+}
+
+# Generates a script in the build bin directory which runs the test
+# target using the test runner script in build/android/test_runner.py.
+template("test_runner_script") {
+  testonly = true
+  _test_name = invoker.test_name
+  _test_type = invoker.test_type
+  _incremental_apk = defined(invoker.incremental_apk) && invoker.incremental_apk
+
+  _runtime_deps =
+      !defined(invoker.ignore_all_data_deps) || !invoker.ignore_all_data_deps
+
+  if (_runtime_deps) {
+    # This runtime_deps file is used at runtime and thus cannot go in
+    # target_gen_dir.
+    _target_dir_name = get_label_info(":$target_name", "dir")
+    _runtime_deps_file =
+        "$root_out_dir/gen.runtime/$_target_dir_name/$target_name.runtime_deps"
+    _runtime_deps_target = "${target_name}__write_deps"
+    group(_runtime_deps_target) {
+      forward_variables_from(invoker,
+                             [
+                               "data",
+                               "deps",
+                               "public_deps",
+                             ])
+      data_deps = []
+      if (defined(invoker.data_deps)) {
+        data_deps += invoker.data_deps
+      }
+      if (defined(invoker.additional_apks)) {
+        data_deps += invoker.additional_apks
+      }
+      write_runtime_deps = _runtime_deps_file
+    }
+  }
+
+  if (defined(invoker.apk_under_test)) {
+    _install_artifacts_json =
+        "${target_gen_dir}/${target_name}.install_artifacts"
+    generated_file("${target_name}__install_artifacts") {
+      deps = [ invoker.apk_under_test ]
+      output_conversion = "json"
+      outputs = [ _install_artifacts_json ]
+      data_keys = [ "install_artifacts" ]
+      walk_keys = [ "install_artifacts_barrier" ]
+      rebase = root_build_dir
+    }
+  }
+
+  generate_android_wrapper(target_name) {
+    wrapper_script = "$root_build_dir/bin/run_${_test_name}"
+
+    executable = "//testing/test_env.py"
+
+    if (defined(android_test_runner_script)) {
+      _runner_script = android_test_runner_script
+    } else {
+      _runner_script = "//build/android/test_runner.py"
+    }
+
+    deps = []
+    if (defined(invoker.deps)) {
+      deps = invoker.deps
+    }
+    data_deps = [
+      "//build/android:test_runner_py",
+      "//testing:test_scripts_shared",
+    ]
+    if (defined(invoker.data_deps)) {
+      data_deps += invoker.data_deps
+    }
+    data = []
+    if (defined(invoker.data)) {
+      data += invoker.data
+    }
+
+    executable_args = [
+      "@WrappedPath(" + rebase_path(_runner_script, root_build_dir) + ")",
+      _test_type,
+      "--output-directory",
+      "@WrappedPath(.)",
+    ]
+
+    if (_runtime_deps) {
+      deps += [ ":$_runtime_deps_target" ]
+      data += [ _runtime_deps_file ]
+      _rebased_runtime_deps_file =
+          rebase_path(_runtime_deps_file, root_build_dir)
+      executable_args += [
+        "--runtime-deps-path",
+        "@WrappedPath(${_rebased_runtime_deps_file})",
+      ]
+    }
+
+    # apk_target is not used for native executable tests
+    # (e.g. breakpad_unittests).
+    if (defined(invoker.apk_target)) {
+      assert(!defined(invoker.executable_dist_dir))
+      deps += [ "${invoker.apk_target}$build_config_target_suffix" ]
+      _apk_build_config =
+          get_label_info(invoker.apk_target, "target_gen_dir") + "/" +
+          get_label_info(invoker.apk_target, "name") + ".build_config.json"
+      _rebased_apk_build_config = rebase_path(_apk_build_config, root_build_dir)
+      not_needed([ "_rebased_apk_build_config" ])
+    } else if (_test_type == "gtest") {
+      assert(
+          defined(invoker.executable_dist_dir),
+          "Must define either apk_target or executable_dist_dir for test_runner_script()")
+      _rebased_executable_dist_dir =
+          rebase_path(invoker.executable_dist_dir, root_build_dir)
+      executable_args += [
+        "--executable-dist-dir",
+        "@WrappedPath(${_rebased_executable_dist_dir})",
+      ]
+    }
+
+    _device_test = true
+    if (_test_type == "gtest") {
+      assert(defined(invoker.test_suite))
+      executable_args += [
+        "--suite",
+        invoker.test_suite,
+      ]
+      if (use_clang_coverage) {
+        # Set a default coverage output directory (can be overridden by user
+        # passing the same flag).
+        _rebased_coverage_dir =
+            rebase_path("$root_out_dir/coverage", root_build_dir)
+        executable_args += [
+          "--coverage-dir",
+          "@WrappedPath(${_rebased_coverage_dir})",
+        ]
+      }
+    } else if (_test_type == "instrumentation") {
+      _test_apk = "@WrappedPath(@FileArg($_rebased_apk_build_config:deps_info:apk_path))"
+      if (_incremental_apk) {
+        _test_apk = "@WrappedPath(@FileArg($_rebased_apk_build_config:deps_info:incremental_apk_path))"
+      }
+      _rebased_test_jar = rebase_path(invoker.test_jar, root_build_dir)
+      executable_args += [
+        "--test-apk",
+        _test_apk,
+        "--test-jar",
+        "@WrappedPath(${_rebased_test_jar})",
+      ]
+      if (defined(invoker.apk_under_test)) {
+        if (_incremental_apk) {
+          deps += [ "${invoker.apk_under_test}$build_config_target_suffix" ]
+          _apk_under_test_build_config =
+              get_label_info(invoker.apk_under_test, "target_gen_dir") + "/" +
+              get_label_info(invoker.apk_under_test, "name") +
+              ".build_config.json"
+          _rebased_apk_under_test_build_config =
+              rebase_path(_apk_under_test_build_config, root_build_dir)
+          _apk_under_test = "@WrappedPath(@FileArg($_rebased_apk_under_test_build_config:deps_info:incremental_apk_path))"
+        } else {
+          deps += [ ":${target_name}__install_artifacts" ]
+          _rebased_install_artifacts_json =
+              rebase_path(_install_artifacts_json, root_build_dir)
+          _apk_under_test =
+              "@WrappedPath(@FileArg($_rebased_install_artifacts_json[]))"
+        }
+        executable_args += [
+          "--apk-under-test",
+          _apk_under_test,
+        ]
+      }
+      if (defined(invoker.use_webview_provider)) {
+        deps += [ "${invoker.use_webview_provider}$build_config_target_suffix" ]
+        _build_config =
+            get_label_info(invoker.use_webview_provider, "target_gen_dir") +
+            "/" + get_label_info(invoker.use_webview_provider, "name") +
+            ".build_config.json"
+        _rebased_build_config = rebase_path(_build_config, root_build_dir)
+        executable_args += [
+          "--use-webview-provider",
+          "@WrappedPath(@FileArg($_rebased_build_config:deps_info:apk_path))",
+        ]
+      }
+      if (defined(invoker.proguard_enabled) && invoker.proguard_enabled &&
+          !_incremental_apk) {
+        executable_args += [ "--enable-java-deobfuscation" ]
+      }
+      if (use_jacoco_coverage) {
+        # Set a default coverage output directory (can be overridden by user
+        # passing the same flag).
+        _rebased_coverage_dir =
+            rebase_path("$root_out_dir/coverage", root_build_dir)
+        executable_args += [
+          "--coverage-dir",
+          "@WrappedPath(${_rebased_coverage_dir})",
+        ]
+      }
+    } else if (_test_type == "junit") {
+      assert(defined(invoker.test_suite))
+      _device_test = false
+      executable_args += [
+        "--test-suite",
+        invoker.test_suite,
+      ]
+
+      deps += [ ":${invoker.test_suite}$build_config_target_suffix" ]
+      _junit_binary_build_config =
+          "${target_gen_dir}/${invoker.test_suite}.build_config.json"
+
+      _rebased_robolectric_runtime_deps_dir =
+          rebase_path("$root_build_dir/lib.java/third_party/robolectric",
+                      root_build_dir)
+      _rebased_resource_apk = rebase_path(invoker.resource_apk, root_build_dir)
+      executable_args += [
+        "--resource-apk",
+        "@WrappedPath(${_rebased_resource_apk})",
+        "--robolectric-runtime-deps-dir",
+        "@WrappedPath(${_rebased_robolectric_runtime_deps_dir})",
+      ]
+      if (use_jacoco_coverage) {
+        # Set a default coverage output directory (can be overridden by user
+        # passing the same flag).
+        _rebased_coverage_dir =
+            rebase_path("$root_out_dir/coverage", root_build_dir)
+        executable_args += [
+          "--coverage-dir",
+          "@WrappedPath(${_rebased_coverage_dir})",
+        ]
+      }
+    } else if (_test_type == "linker") {
+      executable_args += [
+        "--test-apk",
+        "@WrappedPath(@FileArg($_rebased_apk_build_config:deps_info:apk_path))",
+      ]
+    } else {
+      assert(false, "Invalid test type: $_test_type.")
+    }
+
+    if (defined(invoker.additional_apks)) {
+      foreach(additional_apk, invoker.additional_apks) {
+        deps += [ "$additional_apk$build_config_target_suffix" ]
+        _build_config =
+            get_label_info(additional_apk, "target_gen_dir") + "/" +
+            get_label_info(additional_apk, "name") + ".build_config.json"
+        _rebased_build_config = rebase_path(_build_config, root_build_dir)
+        executable_args += [
+          "--additional-apk",
+          "@WrappedPath(@FileArg($_rebased_build_config:deps_info:apk_path))",
+        ]
+      }
+    }
+    if (defined(invoker.shard_timeout)) {
+      executable_args += [ "--shard-timeout=${invoker.shard_timeout}" ]
+    }
+    if (_incremental_apk) {
+      executable_args += [
+        "--test-apk-incremental-install-json",
+        "@WrappedPath(@FileArg($_rebased_apk_build_config:deps_info:incremental_install_json_path))",
+      ]
+      if (defined(invoker.apk_under_test)) {
+        executable_args += [
+          "--apk-under-test-incremental-install-json",
+          "@WrappedPath(@FileArg($_rebased_apk_under_test_build_config:deps_info:incremental_install_json_path))",
+        ]
+      }
+      executable_args += [ "--fast-local-dev" ]
+    }
+    if (_device_test && is_asan) {
+      executable_args += [ "--tool=asan" ]
+    }
+
+    if (defined(invoker.modules)) {
+      foreach(module, invoker.modules) {
+        executable_args += [
+          "--module",
+          module,
+        ]
+      }
+    }
+
+    if (defined(invoker.fake_modules)) {
+      foreach(fake_module, invoker.fake_modules) {
+        executable_args += [
+          "--fake-module",
+          fake_module,
+        ]
+      }
+    }
+
+    if (defined(invoker.additional_locales)) {
+      foreach(locale, invoker.additional_locales) {
+        executable_args += [
+          "--additional-locale",
+          locale,
+        ]
+      }
+    }
+
+    if (defined(invoker.extra_args)) {
+      executable_args += invoker.extra_args
+    }
+  }
+}
+
+if (enable_java_templates) {
+  template("android_lint") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+      if (!defined(deps)) {
+        deps = []
+      }
+
+      # https://crbug.com/1098752 Fix for bot OOM (https://crbug.com/1098333).
+      if (defined(java_cmd_pool_size)) {
+        pool = "//build/config/android:java_cmd_pool($default_toolchain)"
+      } else {
+        pool = "//build/toolchain:link_pool($default_toolchain)"
+      }
+
+      # Lint requires generated sources and generated resources from the build.
+      # Turbine __header targets depend on all generated sources, and the
+      # __assetres targets depend on all generated resources.
+      if (defined(invoker.deps)) {
+        foreach(_dep, invoker.deps) {
+          _target_label = get_label_info(_dep, "label_no_toolchain")
+          if (filter_exclude([ _target_label ], _java_library_patterns) == [] &&
+              filter_exclude([ _target_label ], _java_resource_patterns) !=
+              []) {
+            deps += [
+              "${_target_label}__assetres",
+              "${_target_label}__header",
+            ]
+          } else {
+            # Keep non-java deps as they may generate files used only by lint.
+            # e.g. generated suppressions.xml files.
+            deps += [ _dep ]
+          }
+        }
+      }
+
+      if (defined(invoker.min_sdk_version)) {
+        _min_sdk_version = invoker.min_sdk_version
+      } else {
+        _min_sdk_version = default_min_sdk_version
+      }
+
+      _lint_binary_path = "$lint_android_sdk_root/cmdline-tools/latest/bin/lint"
+      _cache_dir = "$root_build_dir/android_lint_cache"
+
+      # Save generated xml files in a consistent location for debugging.
+      _lint_gen_dir = "$target_gen_dir/$target_name"
+      _backported_methods = "//third_party/r8/backported_methods.txt"
+
+      script = "//build/android/gyp/lint.py"
+      depfile = "$target_gen_dir/$target_name.d"
+      inputs = [
+        _lint_binary_path,
+        _backported_methods,
+      ]
+
+      args = [
+        "--target-name",
+        get_label_info(":${target_name}", "label_no_toolchain"),
+        "--depfile",
+        rebase_path(depfile, root_build_dir),
+        "--lint-binary-path",
+        rebase_path(_lint_binary_path, root_build_dir),
+        "--cache-dir",
+        rebase_path(_cache_dir, root_build_dir),
+        "--lint-gen-dir",
+        rebase_path(_lint_gen_dir, root_build_dir),
+        "--android-sdk-version=${lint_android_sdk_version}",
+        "--min-sdk-version=$_min_sdk_version",
+        "--android-sdk-root",
+        rebase_path(lint_android_sdk_root, root_build_dir),
+        "--backported-methods",
+        rebase_path(_backported_methods, root_build_dir),
+      ]
+
+      if (defined(invoker.skip_build_server) && invoker.skip_build_server) {
+        # Nocompile tests need lint to fail through ninja.
+        args += [ "--skip-build-server" ]
+      }
+
+      if (defined(invoker.lint_suppressions_file)) {
+        inputs += [ invoker.lint_suppressions_file ]
+
+        args += [
+          "--config-path",
+          rebase_path(invoker.lint_suppressions_file, root_build_dir),
+        ]
+      }
+
+      if (defined(testonly) && testonly) {
+        # Allows us to ignore unnecessary checks when linting test targets.
+        args += [ "--testonly" ]
+      }
+
+      if (defined(invoker.manifest_package)) {
+        args += [ "--manifest-package=${invoker.manifest_package}" ]
+      }
+
+      if (treat_warnings_as_errors) {
+        args += [ "--warnings-as-errors" ]
+      }
+
+      if (defined(invoker.lint_baseline_file)) {
+        if (compute_inputs_for_analyze) {
+          # The baseline file is included in lint.py as a depfile dep. Since
+          # removing it regenerates the file, it is useful to not have this as
+          # a gn input during local development. Add it only for bots' analyze.
+          inputs += [ invoker.lint_baseline_file ]
+        }
+        args += [
+          # Baseline allows us to turn on lint warnings without fixing all the
+          # pre-existing issues. This stops the flood of new issues while the
+          # existing ones are being fixed.
+          "--baseline",
+          rebase_path(invoker.lint_baseline_file, root_build_dir),
+        ]
+      }
+
+      if (defined(invoker.create_cache) && invoker.create_cache) {
+        # Putting the stamp file in the cache dir allows us to depend on ninja
+        # to create the cache dir for us.
+        _stamp_path = "$_cache_dir/build.lint.stamp"
+        args += [ "--create-cache" ]
+      } else {
+        _stamp_path = "$target_out_dir/$target_name/build.lint.stamp"
+        deps += [
+          "//build/android:prepare_android_lint_cache",
+          invoker.build_config_dep,
+        ]
+        inputs += [ invoker.build_config ]
+        _rebased_build_config =
+            rebase_path(invoker.build_config, root_build_dir)
+
+        args += [
+          "--manifest-path=@FileArg($_rebased_build_config:deps_info:lint_android_manifest)",
+          "--extra-manifest-paths=@FileArg($_rebased_build_config:deps_info:lint_extra_android_manifests)",
+
+          # Lint requires all source and all resource files to be passed in the
+          # same invocation for checks like UnusedResources.
+          "--java-sources=@FileArg($_rebased_build_config:deps_info:lint_java_sources)",
+          "--aars=@FileArg($_rebased_build_config:deps_info:lint_aars)",
+          "--srcjars=@FileArg($_rebased_build_config:deps_info:lint_srcjars)",
+          "--resource-sources=@FileArg($_rebased_build_config:deps_info:lint_resource_sources)",
+          "--resource-zips=@FileArg($_rebased_build_config:deps_info:lint_resource_zips)",
+
+          # The full classpath is required for annotation checks like @IntDef.
+          "--classpath=@FileArg($_rebased_build_config:deps_info:javac_full_interface_classpath)",
+        ]
+      }
+
+      outputs = [ _stamp_path ]
+      args += [
+        "--stamp",
+        rebase_path(_stamp_path, root_build_dir),
+      ]
+    }
+  }
+
+  template("proguard") {
+    forward_variables_from(invoker,
+                           TESTONLY_AND_VISIBILITY + [
+                                 "data",
+                                 "data_deps",
+                                 "public_deps",
+                               ])
+    _script = "//build/android/gyp/proguard.py"
+    _deps = invoker.deps
+
+    _inputs = [
+      invoker.build_config,
+      _r8_path,
+    ]
+    if (defined(invoker.inputs)) {
+      _inputs += invoker.inputs
+    }
+    if (defined(invoker.proguard_mapping_path)) {
+      _mapping_path = invoker.proguard_mapping_path
+    } else {
+      _mapping_path = "${invoker.output_path}.mapping"
+    }
+
+    _enable_jdk_library_desugaring = enable_jdk_library_desugaring
+    if (defined(invoker.supports_jdk_library_desugaring) &&
+        !invoker.supports_jdk_library_desugaring) {
+      _enable_jdk_library_desugaring = false
+    }
+
+    _rebased_build_config = rebase_path(invoker.build_config, root_build_dir)
+    _args = [
+      "--mapping-output",
+      rebase_path(_mapping_path, root_build_dir),
+      "--classpath",
+      "@FileArg($_rebased_build_config:deps_info:proguard_classpath_jars)",
+      "--classpath",
+      "@FileArg($_rebased_build_config:android:sdk_jars)",
+      "--r8-path",
+      rebase_path(_r8_path, root_build_dir),
+    ]
+    if (treat_warnings_as_errors) {
+      _args += [ "--warnings-as-errors" ]
+    }
+    if (defined(invoker.desugar_jars_paths)) {
+      _rebased_desugar_jars_paths =
+          rebase_path(invoker.desugar_jars_paths, root_build_dir)
+      args += [ "--classpath=${_rebased_desugar_jars_paths}" ]
+    }
+
+    if ((!defined(invoker.proguard_enable_obfuscation) ||
+         invoker.proguard_enable_obfuscation) && enable_proguard_obfuscation) {
+      _proguard_sourcefile_suffix = ""
+      if (defined(invoker.proguard_sourcefile_suffix)) {
+        _proguard_sourcefile_suffix = "-${invoker.proguard_sourcefile_suffix}"
+      }
+
+      # This is generally the apk name, and serves to identify the mapping
+      # file that would be required to deobfuscate a stacktrace.
+      _mapping_id = get_path_info(_mapping_path, "name")
+      _args += [
+        "--enable-obfuscation",
+        "--sourcefile",
+        "chromium-${_mapping_id}${_proguard_sourcefile_suffix}",
+      ]
+    } else if (defined(invoker.proguard_sourcefile_suffix)) {
+      not_needed(invoker, [ "proguard_sourcefile_suffix" ])
+    }
+
+    if (defined(invoker.modules)) {
+      foreach(_feature_module, invoker.modules) {
+        _rebased_module_build_config =
+            rebase_path(_feature_module.build_config, root_build_dir)
+        _args += [
+          "--feature-name=${_feature_module.name}",
+          "--dex-dest=@FileArg($_rebased_module_build_config:final_dex:path)",
+          "--feature-jars=@FileArg($_rebased_module_build_config:deps_info:device_classpath)",
+        ]
+        if (defined(_feature_module.uses_split)) {
+          _args += [ "--uses-split=${_feature_module.name}:${_feature_module.uses_split}" ]
+        }
+        _deps += [ _feature_module.build_config_target ]
+      }
+      _stamp = "${target_gen_dir}/${target_name}.r8.stamp"
+      _outputs = [ _stamp ]
+      _output_arg = [
+        "--stamp",
+        rebase_path(_stamp, root_build_dir),
+      ]
+    } else {
+      # We don't directly set the output arg on the _args variable since it is
+      # shared with the expectation target that uses its own stamp file and
+      # does not take an --output-path.
+      _output_arg = [
+        "--output-path",
+        rebase_path(invoker.output_path, root_build_dir),
+      ]
+      _outputs = [ invoker.output_path ]
+    }
+    _outputs += [ _mapping_path ]
+
+    if (defined(invoker.disable_r8_outlining) && invoker.disable_r8_outlining) {
+      _args += [ "--disable-outlining" ]
+    }
+
+    if (defined(invoker.enable_proguard_checks) &&
+        !invoker.enable_proguard_checks) {
+      _args += [ "--disable-checks" ]
+    }
+
+    if (defined(invoker.is_static_library) && invoker.is_static_library) {
+      _args += [
+        "--extra-mapping-output-paths",
+        "@FileArg($_rebased_build_config:deps_info:static_library_proguard_mapping_output_paths)",
+      ]
+    }
+
+    if (_enable_jdk_library_desugaring) {
+      _args += [
+        "--desugar-jdk-libs-json",
+        rebase_path(_desugar_jdk_libs_json, root_build_dir),
+      ]
+      _inputs += [ _desugar_jdk_libs_json ]
+
+      _args += [
+        "--desugar-jdk-libs-jar",
+        rebase_path(_desugar_jdk_libs_jar, root_build_dir),
+        "--desugar-jdk-libs-configuration-jar",
+        rebase_path(_desugar_jdk_libs_configuration_jar, root_build_dir),
+      ]
+      _inputs += [
+        _desugar_jdk_libs_jar,
+        _desugar_jdk_libs_configuration_jar,
+      ]
+
+      _desugared_library_keep_rule_output_path =
+          "$target_gen_dir/$target_name.desugared_library_keep_rules.flags"
+      _args += [
+        "--desugared-library-keep-rule-output",
+        rebase_path(_desugared_library_keep_rule_output_path, root_build_dir),
+      ]
+    }
+    _ignore_desugar_missing_deps =
+        defined(invoker.ignore_desugar_missing_deps) &&
+        invoker.ignore_desugar_missing_deps
+    if (!_ignore_desugar_missing_deps) {
+      _args += [ "--show-desugar-default-interface-warnings" ]
+    }
+
+    if (enable_java_asserts) {
+      # The default for generating dex file format is
+      # --force-disable-assertions.
+      _args += [ "--force-enable-assertions" ]
+    }
+
+    if (defined(invoker.args)) {
+      _args += invoker.args
+    }
+
+    if (defined(invoker.expected_proguard_config)) {
+      _expectations_target =
+          "${invoker.top_target_name}_validate_proguard_config"
+      action_with_pydeps(_expectations_target) {
+        script = _script
+
+        # Need to depend on all deps so that proguard.txt within .aar files get
+        # extracted.
+        deps = _deps
+        depfile = "${target_gen_dir}/${target_name}.d"
+        inputs = [
+          invoker.build_config,
+          invoker.expected_proguard_config,
+        ]
+        _actual_file = "$target_gen_dir/$target_name.proguard_configs"
+        _failure_file =
+            "$expectations_failure_dir/" +
+            string_replace(invoker.expected_proguard_config, "/", "_")
+        outputs = [
+          _actual_file,
+          _failure_file,
+        ]
+        args = _args + [
+                 "--depfile",
+                 rebase_path(depfile, root_build_dir),
+                 "--failure-file",
+                 rebase_path(_failure_file, root_build_dir),
+                 "--expected-file",
+                 rebase_path(invoker.expected_proguard_config, root_build_dir),
+                 "--actual-file",
+                 rebase_path(_actual_file, root_build_dir),
+                 "--only-verify-expectations",
+               ]
+        if (defined(invoker.expected_proguard_config_base)) {
+          inputs += [ invoker.expected_proguard_config_base ]
+          args += [
+            "--expected-file-base",
+            rebase_path(invoker.expected_proguard_config_base, root_build_dir),
+          ]
+        }
+        if (fail_on_android_expectations) {
+          args += [ "--fail-on-expectations" ]
+        }
+      }
+      _deps += [ ":$_expectations_target" ]
+    }
+    action_with_pydeps(target_name) {
+      script = _script
+      deps = _deps
+      inputs = _inputs
+      outputs = _outputs
+      depfile = "${target_gen_dir}/${target_name}.d"
+      args = _args + _output_arg + [
+               "--depfile",
+               rebase_path(depfile, root_build_dir),
+             ]
+
+      # http://crbug.com/725224. Fix for bots running out of memory.
+      if (defined(java_cmd_pool_size)) {
+        pool = "//build/config/android:java_cmd_pool($default_toolchain)"
+      } else {
+        pool = "//build/toolchain:link_pool($default_toolchain)"
+      }
+    }
+  }
+
+  # Generates a script in the build bin directory to run a java binary.
+  #
+  # Variables
+  #   main_class: The class containing the program entry point.
+  #   build_config: Path to .build_config.json for the jar (contains classpath).
+  #   script_name: Name of the script to generate.
+  #   wrapper_script_args: List of extra arguments to pass to the executable.
+  #   tiered_stop_at_level_one: Whether to pass --tiered-stop-at-level-one
+  #
+  template("java_binary_script") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "deps" ])
+
+      _main_class = invoker.main_class
+      _build_config = invoker.build_config
+      _script_name = invoker.script_name
+
+      script = "//build/android/gyp/create_java_binary_script.py"
+      inputs = [ _build_config ]
+      _java_script = "$root_build_dir/bin/$_script_name"
+      outputs = [ _java_script ]
+      _rebased_build_config = rebase_path(_build_config, root_build_dir)
+      args = [
+        "--output",
+        rebase_path(_java_script, root_build_dir),
+        "--main-class",
+        _main_class,
+      ]
+      args += [
+        "--classpath=@FileArg($_rebased_build_config:deps_info:host_classpath)",
+      ]
+
+      if (use_jacoco_coverage) {
+        args += [
+          "--classpath",
+          rebase_path("//third_party/jacoco/lib/jacocoagent.jar",
+                      root_build_dir),
+        ]
+      }
+      if (use_jacoco_coverage || !treat_warnings_as_errors) {
+        args += [ "--noverify" ]
+      }
+      if (defined(invoker.tiered_stop_at_level_one) &&
+          invoker.tiered_stop_at_level_one) {
+        args += [ "--tiered-stop-at-level-one" ]
+      }
+      if (defined(invoker.wrapper_script_args)) {
+        args += [ "--" ] + invoker.wrapper_script_args
+      }
+    }
+  }
+
+  # Variables
+  #   apply_mapping: The path to the ProGuard mapping file to apply.
+  #   disable_incremental: Disable incremental dexing.
+  template("dex") {
+    _min_sdk_version = default_min_sdk_version
+    if (defined(invoker.min_sdk_version)) {
+      _min_sdk_version = invoker.min_sdk_version
+    }
+
+    _proguard_enabled =
+        defined(invoker.proguard_enabled) && invoker.proguard_enabled
+    _is_dex_merging = defined(invoker.input_dex_filearg)
+    _enable_multidex =
+        !defined(invoker.enable_multidex) || invoker.enable_multidex
+    _enable_main_dex_list = _enable_multidex && _min_sdk_version < 21
+    _enable_desugar = !defined(invoker.enable_desugar) || invoker.enable_desugar
+    _use_classic_desugar =
+        defined(invoker.use_classic_desugar) && invoker.use_classic_desugar
+    _desugar_needs_classpath = _enable_desugar && !_use_classic_desugar
+
+    # It's not safe to dex merge with libraries dex'ed at higher api versions.
+    assert(!_is_dex_merging || _min_sdk_version >= default_min_sdk_version)
+
+    # For D8's backported method desugaring to work properly, the dex merge step
+    # must not be set to a higher minSdkVersion than it was for the libraries.
+    if (_enable_desugar && _is_dex_merging) {
+      _min_sdk_version = default_min_sdk_version
+    }
+
+    assert(defined(invoker.output) ||
+           (_proguard_enabled && defined(invoker.modules)))
+    assert(!_proguard_enabled || !(defined(invoker.input_dex_filearg) ||
+                                       defined(invoker.input_classes_filearg) ||
+                                       defined(invoker.input_class_jars)),
+           "Cannot explicitly set inputs when proguarding a dex.")
+
+    # Dex merging should not also be dexing.
+    assert(!(_is_dex_merging && defined(invoker.input_classes_filearg)))
+    assert(!(_is_dex_merging && defined(invoker.input_class_jars)))
+
+    assert(!(defined(invoker.apply_mapping) && !_proguard_enabled),
+           "apply_mapping can only be specified if proguard is enabled.")
+
+    if (_enable_main_dex_list) {
+      _main_dex_rules = "//build/android/main_dex_classes.flags"
+    }
+
+    if (_desugar_needs_classpath || _proguard_enabled) {
+      _rebased_build_config = rebase_path(invoker.build_config, root_build_dir)
+    }
+
+    if (_proguard_enabled) {
+      _proguard_target_name = target_name
+
+      proguard(_proguard_target_name) {
+        forward_variables_from(invoker,
+                               TESTONLY_AND_VISIBILITY + [
+                                     "build_config",
+                                     "data",
+                                     "data_deps",
+                                     "deps",
+                                     "desugar_jars_paths",
+                                     "disable_r8_outlining",
+                                     "enable_proguard_checks",
+                                     "expected_proguard_config",
+                                     "expected_proguard_config_base",
+                                     "ignore_desugar_missing_deps",
+                                     "is_static_library",
+                                     "modules",
+                                     "proguard_enable_obfuscation",
+                                     "proguard_mapping_path",
+                                     "proguard_sourcefile_suffix",
+                                     "supports_jdk_library_desugaring",
+                                     "top_target_name",
+                                   ])
+        inputs = []
+        if (defined(invoker.inputs)) {
+          inputs += invoker.inputs
+        }
+        if (defined(invoker.proguard_configs)) {
+          inputs += invoker.proguard_configs
+        }
+
+        args = [
+          "--proguard-configs=@FileArg($_rebased_build_config:deps_info:proguard_all_configs)",
+          "--min-api=$_min_sdk_version",
+        ]
+        if (defined(invoker.has_apk_under_test) && invoker.has_apk_under_test) {
+          args += [ "--input-paths=@FileArg($_rebased_build_config:deps_info:device_classpath_extended)" ]
+        } else {
+          args += [ "--input-paths=@FileArg($_rebased_build_config:deps_info:device_classpath)" ]
+        }
+        if (_use_classic_desugar) {
+          deps += [ "//third_party/bazel/desugar:desugar_runtime_java" ]
+          inputs += [ _desugar_runtime_jar ]
+          args += [
+            "--input-paths",
+            rebase_path(_desugar_runtime_jar, root_build_dir),
+          ]
+        }
+        if (defined(invoker.proguard_args)) {
+          args += invoker.proguard_args
+        }
+
+        if (defined(invoker.apply_mapping)) {
+          _rebased_apply_mapping_path =
+              rebase_path(invoker.apply_mapping, root_build_dir)
+          args += [ "--apply-mapping=$_rebased_apply_mapping_path" ]
+        }
+
+        if (_enable_main_dex_list) {
+          if (defined(invoker.extra_main_dex_proguard_config)) {
+            args += [
+              "--main-dex-rules-path",
+              rebase_path(invoker.extra_main_dex_proguard_config,
+                          root_build_dir),
+            ]
+            inputs += [ invoker.extra_main_dex_proguard_config ]
+          }
+          args += [
+            "--main-dex-rules-path",
+            rebase_path(_main_dex_rules, root_build_dir),
+          ]
+          inputs += [ _main_dex_rules ]
+        }
+
+        if (defined(invoker.output)) {
+          output_path = invoker.output
+        } else if (!defined(proguard_mapping_path)) {
+          proguard_mapping_path = "$target_out_dir/$target_name.mapping"
+        }
+      }
+    } else {  # !_proguard_enabled
+      _is_library = defined(invoker.is_library) && invoker.is_library
+      _input_class_jars = []
+      if (defined(invoker.input_class_jars)) {
+        _input_class_jars = invoker.input_class_jars
+      }
+      _deps = invoker.deps
+
+      if (!_is_library && _use_classic_desugar) {
+        # It would be more efficient to use the pre-dex'ed copy of the runtime,
+        # but it's easier to add it in this way.
+        _deps += [ "//third_party/bazel/desugar:desugar_runtime_java" ]
+        _input_class_jars += [ _desugar_runtime_jar ]
+      }
+      if (_input_class_jars != []) {
+        _rebased_input_class_jars =
+            rebase_path(_input_class_jars, root_build_dir)
+      }
+
+      action_with_pydeps(target_name) {
+        forward_variables_from(invoker,
+                               TESTONLY_AND_VISIBILITY + [
+                                     "data",
+                                     "data_deps",
+                                   ])
+        script = "//build/android/gyp/dex.py"
+        deps = _deps
+        depfile = "$target_gen_dir/$target_name.d"
+        outputs = [ invoker.output ]
+        inputs = [
+          _r8_path,
+          _custom_d8_path,
+        ]
+
+        if (!_is_library) {
+          # http://crbug.com/725224. Fix for bots running out of memory.
+          if (defined(java_cmd_pool_size)) {
+            pool = "//build/config/android:java_cmd_pool($default_toolchain)"
+          } else {
+            pool = "//build/toolchain:link_pool($default_toolchain)"
+          }
+        }
+
+        args = [
+          "--depfile",
+          rebase_path(depfile, root_build_dir),
+          "--output",
+          rebase_path(outputs[0], root_build_dir),
+          "--min-api=$_min_sdk_version",
+          "--r8-jar-path",
+          rebase_path(_r8_path, root_build_dir),
+          "--custom-d8-jar-path",
+          rebase_path(_custom_d8_path, root_build_dir),
+
+          # Uncomment when rebuilding custom_d8.jar.
+          #"--skip-custom-d8",
+        ]
+        if (treat_warnings_as_errors) {
+          args += [ "--warnings-as-errors" ]
+        }
+
+        if (enable_incremental_d8 && !(defined(invoker.disable_incremental) &&
+                                       invoker.disable_incremental)) {
+          # Don't use incremental dexing for ProGuarded inputs as a precaution.
+          args += [
+            "--incremental-dir",
+            rebase_path("$target_out_dir/$target_name", root_build_dir),
+          ]
+        }
+
+        if (_enable_multidex) {
+          args += [ "--multi-dex" ]
+          if (_enable_main_dex_list) {
+            if (defined(invoker.extra_main_dex_proguard_config)) {
+              args += [
+                "--main-dex-rules-path",
+                rebase_path(invoker.extra_main_dex_proguard_config,
+                            root_build_dir),
+              ]
+              inputs += [ invoker.extra_main_dex_proguard_config ]
+            }
+            args += [
+              "--main-dex-rules-path",
+              rebase_path(_main_dex_rules, root_build_dir),
+            ]
+            inputs += [ _main_dex_rules ]
+          }
+        }
+        if (_is_library) {
+          args += [ "--library" ]
+        }
+        if (defined(invoker.input_dex_filearg)) {
+          inputs += [ invoker.build_config ]
+          args += [ "--dex-inputs-filearg=${invoker.input_dex_filearg}" ]
+        }
+        if (defined(invoker.input_classes_filearg)) {
+          inputs += [ invoker.build_config ]
+          args += [ "--class-inputs-filearg=${invoker.input_classes_filearg}" ]
+        }
+        if (_input_class_jars != []) {
+          inputs += _input_class_jars
+          args += [ "--class-inputs=${_rebased_input_class_jars}" ]
+        }
+
+        if (defined(invoker.dexlayout_profile)) {
+          args += [
+            "--dexlayout-profile",
+            rebase_path(invoker.dexlayout_profile, root_build_dir),
+            "--dexlayout-path",
+            rebase_path(_dexlayout_path, root_build_dir),
+            "--profman-path",
+            rebase_path(_profman_path, root_build_dir),
+            "--dexdump-path",
+            rebase_path(_dexdump_path, root_build_dir),
+          ]
+          inputs += [
+            _dexlayout_path,
+            _profman_path,
+            _dexdump_path,
+            invoker.dexlayout_profile,
+          ]
+          inputs += _default_art_libs
+        }
+
+        # Never compile intemediates with --release in order to:
+        # 1) not require recompiles when toggling is_java_debug,
+        # 2) allow incremental_install=1 to still have local variable
+        #    information even when is_java_debug=false.
+        if (!is_java_debug && !_is_library) {
+          args += [ "--release" ]
+        }
+
+        if (_enable_desugar) {
+          args += [ "--desugar" ]
+
+          # Passing the flag for dex merging causes invalid dex files to be created.
+          if (enable_jdk_library_desugaring && !_is_dex_merging) {
+            inputs += [ _desugar_jdk_libs_json ]
+            args += [
+              "--desugar-jdk-libs-json",
+              rebase_path(_desugar_jdk_libs_json, root_build_dir),
+            ]
+          }
+          _ignore_desugar_missing_deps =
+              defined(invoker.ignore_desugar_missing_deps) &&
+              invoker.ignore_desugar_missing_deps
+          if (!_ignore_desugar_missing_deps && !_use_classic_desugar) {
+            args += [ "--show-desugar-default-interface-warnings" ]
+          }
+        }
+        if (_desugar_needs_classpath) {
+          _desugar_dependencies_path =
+              "$target_gen_dir/$target_name.desugardeps"
+          args += [
+            "--desugar-dependencies",
+            rebase_path(_desugar_dependencies_path, root_build_dir),
+            "--bootclasspath=@FileArg($_rebased_build_config:android:sdk_jars)",
+
+            # Pass the full classpath to find new dependencies that are not in
+            # the .desugardeps file.
+            "--classpath=@FileArg($_rebased_build_config:deps_info:javac_full_interface_classpath)",
+          ]
+          if (defined(invoker.desugar_jars_paths)) {
+            _rebased_desugar_jars_paths =
+                rebase_path(invoker.desugar_jars_paths, root_build_dir)
+            args += [ "--classpath=${_rebased_desugar_jars_paths}" ]
+          }
+          if (defined(invoker.final_ijar_path)) {
+            # Need to include the input .interface.jar on the classpath in order to make
+            # jar_excluded_patterns classes visible to desugar.
+            args += [
+              "--classpath",
+              rebase_path(invoker.final_ijar_path, root_build_dir),
+            ]
+            inputs += [ invoker.final_ijar_path ]
+          }
+        } else {
+          not_needed(invoker, [ "desugar_jars_paths" ])
+        }
+
+        if (enable_java_asserts) {
+          # The default for generating dex file format is
+          # --force-disable-assertions.
+          args += [ "--force-enable-assertions" ]
+        }
+      }
+    }
+  }
+
+  # Variables
+  #   output: Path to output ".l8.dex".
+  #   min_sdk_version: The minimum Android SDK version this target supports.
+  template("dex_jdk_libs") {
+    action_with_pydeps(target_name) {
+      script = "//build/android/gyp/dex_jdk_libs.py"
+      inputs = [
+        _r8_path,
+        _desugar_jdk_libs_json,
+        _desugar_jdk_libs_jar,
+        _desugar_jdk_libs_configuration_jar,
+      ]
+      outputs = [ invoker.output ]
+      args = [
+        "--r8-path",
+        rebase_path(_r8_path, root_build_dir),
+        "--desugar-jdk-libs-json",
+        rebase_path(_desugar_jdk_libs_json, root_build_dir),
+        "--desugar-jdk-libs-jar",
+        rebase_path(_desugar_jdk_libs_jar, root_build_dir),
+        "--desugar-jdk-libs-configuration-jar",
+        rebase_path(_desugar_jdk_libs_configuration_jar, root_build_dir),
+        "--output",
+        rebase_path(invoker.output, root_build_dir),
+        "--min-api=${invoker.min_sdk_version}",
+      ]
+      if (treat_warnings_as_errors) {
+        args += [ "--warnings-as-errors" ]
+      }
+    }
+  }
+
+  template("jacoco_instr") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker,
+                             TESTONLY_AND_VISIBILITY + [
+                                   "deps",
+                                   "public_deps",
+                                 ])
+
+      # The name needs to match the SOURCES_JSON_FILES_SUFFIX in
+      # generate_coverage_metadata_for_java.py.
+      _sources_json_file = "$target_out_dir/${target_name}__jacoco_sources.json"
+      _jacococli_jar = "//third_party/jacoco/lib/jacococli.jar"
+
+      script = "//build/android/gyp/jacoco_instr.py"
+      inputs = invoker.java_files + [
+                 _jacococli_jar,
+                 invoker.input_jar_path,
+               ]
+      outputs = [
+        _sources_json_file,
+        invoker.output_jar_path,
+      ]
+      args = [
+        "--input-path",
+        rebase_path(invoker.input_jar_path, root_build_dir),
+        "--output-path",
+        rebase_path(invoker.output_jar_path, root_build_dir),
+        "--sources-json-file",
+        rebase_path(_sources_json_file, root_build_dir),
+        "--java-sources-file",
+        rebase_path(invoker.java_sources_file, root_build_dir),
+        "--jacococli-jar",
+        rebase_path(_jacococli_jar, root_build_dir),
+      ]
+      if (coverage_instrumentation_input_file != "") {
+        args += [
+          "--files-to-instrument",
+          rebase_path(coverage_instrumentation_input_file, root_build_dir),
+        ]
+      }
+    }
+  }
+
+  template("filter_jar") {
+    action_with_pydeps(target_name) {
+      script = "//build/android/gyp/filter_zip.py"
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "deps" ])
+      inputs = [ invoker.input_jar ]
+      if (defined(invoker.inputs)) {
+        inputs += invoker.inputs
+      }
+      outputs = [ invoker.output_jar ]
+
+      _jar_excluded_patterns = []
+      if (defined(invoker.jar_excluded_patterns)) {
+        _jar_excluded_patterns = invoker.jar_excluded_patterns
+      }
+      _jar_included_patterns = []
+      if (defined(invoker.jar_included_patterns)) {
+        _jar_included_patterns = invoker.jar_included_patterns
+      }
+      args = [
+        "--input",
+        rebase_path(invoker.input_jar, root_build_dir),
+        "--output",
+        rebase_path(invoker.output_jar, root_build_dir),
+        "--exclude-globs=${_jar_excluded_patterns}",
+        "--include-globs=${_jar_included_patterns}",
+      ]
+    }
+  }
+
+  template("process_java_library") {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+    _deps = invoker.jar_deps
+    _previous_output_jar = invoker.input_jar_path
+
+    if (invoker.is_device_jar && invoker.enable_desugar) {
+      _desugar_target = "${target_name}_device__desugar"
+      _desugar_output_jar = "$target_out_dir/$target_name.desugar.jar"
+
+      action_with_pydeps(_desugar_target) {
+        script = "//build/android/gyp/desugar.py"
+        deps = _deps + invoker.classpath_deps
+        depfile = "$target_gen_dir/$target_name.d"
+        _rebased_build_config =
+            rebase_path(invoker.build_config, root_build_dir)
+        _desugar_jar = "//third_party/bazel/desugar/Desugar.jar"
+
+        inputs = [
+          invoker.build_config,
+          _previous_output_jar,
+          _desugar_jar,
+        ]
+        outputs = [ _desugar_output_jar ]
+        args = [
+          "--desugar-jar",
+          rebase_path(_desugar_jar, root_build_dir),
+          "--input-jar",
+          rebase_path(_previous_output_jar, root_build_dir),
+          "--output-jar",
+          rebase_path(_desugar_output_jar, root_build_dir),
+
+          # Temporarily using java_full_interface_classpath until classpath validation of targets
+          # is implemented, see http://crbug.com/885273
+          "--classpath=@FileArg($_rebased_build_config:deps_info:javac_full_interface_classpath)",
+          "--bootclasspath=@FileArg($_rebased_build_config:android:sdk_interface_jars)",
+          "--depfile",
+          rebase_path(depfile, root_build_dir),
+        ]
+        if (defined(invoker.desugar_jars_paths)) {
+          _rebased_desugar_jars_paths =
+              rebase_path(invoker.desugar_jars_paths, root_build_dir)
+          args += [ "--classpath=${_rebased_desugar_jars_paths}" ]
+        }
+        if (treat_warnings_as_errors) {
+          args += [ "--warnings-as-errors" ]
+        }
+      }
+
+      _deps = []
+      _deps = [ ":$_desugar_target" ]
+      _previous_output_jar = _desugar_output_jar
+    }
+
+    if (invoker.jacoco_instrument) {
+      _filter_jar_target_name = "${target_name}__filter_jar"
+      _filter_jar_output_jar = "$target_out_dir/$target_name.filter.jar"
+    } else {
+      _filter_jar_target_name = target_name
+      _filter_jar_output_jar = invoker.output_jar_path
+    }
+
+    filter_jar(_filter_jar_target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "jar_excluded_patterns",
+                               "jar_included_patterns",
+                             ])
+      deps = _deps
+      input_jar = _previous_output_jar
+      output_jar = _filter_jar_output_jar
+    }
+
+    if (invoker.jacoco_instrument) {
+      # Jacoco must run after desugar (or else desugar sometimes fails).
+      # It must run after filtering to avoid the same (filtered) class mapping
+      # to multiple .jar files.
+      # We run offline code coverage processing here rather than with a
+      # javaagent as the desired coverage data was not being generated.
+      # See crbug.com/1097815.
+      jacoco_instr(target_name) {
+        deps = [ ":$_filter_jar_target_name" ] + invoker.jar_deps
+        forward_variables_from(invoker,
+                               [
+                                 "java_files",
+                                 "java_sources_file",
+                               ])
+
+        input_jar_path = _filter_jar_output_jar
+        output_jar_path = invoker.output_jar_path
+      }
+    }
+  }
+
+  template("bytecode_processor") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+      _bytecode_checker_script = "$root_build_dir/bin/helper/bytecode_processor"
+      script = "//build/android/gyp/bytecode_processor.py"
+      inputs = [
+        invoker.build_config,
+        invoker.input_jar,
+        _bytecode_checker_script,
+      ]
+      outputs = [ "$target_out_dir/$target_name.bytecode.stamp" ]
+      deps =
+          invoker.deps +
+          [ "//build/android/bytecode:bytecode_processor($default_toolchain)" ]
+      _rebased_build_config = rebase_path(invoker.build_config, root_build_dir)
+      args = [
+        "--target-name",
+        get_label_info(":${target_name}", "label_no_toolchain"),
+        "--script",
+        rebase_path(_bytecode_checker_script, root_build_dir),
+        "--gn-target=${invoker.target_label}",
+        "--input-jar",
+        rebase_path(invoker.input_jar, root_build_dir),
+        "--stamp",
+        rebase_path(outputs[0], root_build_dir),
+        "--direct-classpath-jars=@FileArg($_rebased_build_config:javac:classpath)",
+        "--full-classpath-jars=@FileArg($_rebased_build_config:deps_info:javac_full_classpath)",
+        "--full-classpath-gn-targets=@FileArg($_rebased_build_config:deps_info:javac_full_classpath_targets)",
+      ]
+      if (invoker.requires_android) {
+        args += [ "--sdk-classpath-jars=@FileArg($_rebased_build_config:android:sdk_jars)" ]
+      }
+      if (invoker.is_prebuilt) {
+        args += [ "--is-prebuilt" ]
+      }
+      if (treat_warnings_as_errors) {
+        args += [ "--warnings-as-errors" ]
+      }
+      if (defined(invoker.missing_classes_allowlist)) {
+        args += [
+          "--missing-classes-allowlist=${invoker.missing_classes_allowlist}",
+        ]
+      }
+    }
+  }
+
+  template("merge_manifests") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "deps" ])
+      script = "//build/android/gyp/merge_manifest.py"
+      depfile = "$target_gen_dir/$target_name.d"
+
+      inputs = [
+        invoker.build_config,
+        invoker.input_manifest,
+      ]
+
+      outputs = [ invoker.output_manifest ]
+      _rebased_build_config = rebase_path(invoker.build_config, root_build_dir)
+
+      args = [
+        "--depfile",
+        rebase_path(depfile, root_build_dir),
+        "--android-sdk-cmdline-tools",
+        rebase_path("${public_android_sdk_root}/cmdline-tools/latest",
+                    root_build_dir),
+        "--root-manifest",
+        rebase_path(invoker.input_manifest, root_build_dir),
+        "--output",
+        rebase_path(invoker.output_manifest, root_build_dir),
+        "--extras",
+        "@FileArg($_rebased_build_config:extra_android_manifests)",
+        "--min-sdk-version=${invoker.min_sdk_version}",
+        "--target-sdk-version=${invoker.target_sdk_version}",
+      ]
+
+      if (defined(invoker.manifest_package)) {
+        args += [ "--manifest-package=${invoker.manifest_package}" ]
+      }
+
+      if (defined(invoker.max_sdk_version)) {
+        args += [ "--max-sdk-version=${invoker.max_sdk_version}" ]
+      }
+
+      if (treat_warnings_as_errors) {
+        args += [ "--warnings-as-errors" ]
+      }
+    }
+  }
+
+  # This template is used to parse a set of resource directories and
+  # create the R.txt, .srcjar and .resources.zip for it.
+  #
+  # Input variables:
+  #   deps: Specifies the input dependencies for this target.
+  #
+  #   build_config: Path to the .build_config.json file corresponding to the target.
+  #
+  #   sources:
+  #     List of input resource files.
+  #
+  #   custom_package: (optional)
+  #     Package name for the generated R.java source file. Optional if
+  #     android_manifest is not provided.
+  #
+  #   android_manifest: (optional)
+  #     If custom_package is not provided, path to an AndroidManifest.xml file
+  #     that is only used to extract a package name out of it.
+  #
+  #   r_text_in_path: (optional)
+  #     Path to an input R.txt file to use to generate the R.java file.
+  #     The default is to use 'aapt' to generate the file from the content
+  #     of the resource directories.
+  #
+  # Output variables:
+  #   resources_zip:
+  #     Path to a .resources.zip that will simply contain all the
+  #     input resources, collected in a single archive.
+  #
+  #   r_text_out_path: Path for the generated R.txt file.
+  #
+  template("prepare_resources") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker,
+                             TESTONLY_AND_VISIBILITY + [
+                                   "deps",
+                                   "sources",
+                                 ])
+      script = "//build/android/gyp/prepare_resources.py"
+
+      depfile = "$target_gen_dir/${invoker.target_name}.d"
+      outputs = [
+        invoker.resources_zip,
+        invoker.resources_zip + ".info",
+        invoker.r_text_out_path,
+      ]
+
+      inputs = [ invoker.res_sources_path ]
+
+      _rebased_res_sources_path =
+          rebase_path(invoker.res_sources_path, root_build_dir)
+
+      args = [
+        "--depfile",
+        rebase_path(depfile, root_build_dir),
+        "--res-sources-path=$_rebased_res_sources_path",
+        "--resource-zip-out",
+        rebase_path(invoker.resources_zip, root_build_dir),
+        "--r-text-out",
+        rebase_path(invoker.r_text_out_path, root_build_dir),
+      ]
+
+      if (defined(invoker.r_text_in_path)) {
+        _r_text_in_path = invoker.r_text_in_path
+        inputs += [ _r_text_in_path ]
+        args += [
+          "--r-text-in",
+          rebase_path(_r_text_in_path, root_build_dir),
+        ]
+      }
+
+      if (defined(invoker.strip_drawables) && invoker.strip_drawables) {
+        args += [ "--strip-drawables" ]
+      }
+      if (defined(invoker.allow_missing_resources) &&
+          invoker.allow_missing_resources) {
+        args += [ "--allow-missing-resources" ]
+      }
+    }
+  }
+
+  # A template that is used to compile all resources needed by a binary
+  # (e.g. an android_apk or a junit_binary) into an intermediate .ar_
+  # archive. It can also generate an associated .srcjar that contains the
+  # final R.java sources for all resource packages the binary depends on.
+  #
+  # Input variables:
+  #   android_sdk_dep: The sdk dep that these resources should compile against.
+  #
+  #   deps: Specifies the input dependencies for this target.
+  #
+  #   build_config: Path to the .build_config.json file corresponding to the target.
+  #
+  #   build_config_dep: Dep target to generate the .build_config.json file.
+  #
+  #   android_manifest: Path to root manifest for the binary.
+  #
+  #   version_code: (optional)
+  #
+  #   version_name: (optional)
+  #
+  #   shared_resources: (optional)
+  #     If true, make all variables in each generated R.java file non-final,
+  #     and provide an onResourcesLoaded() method that can be used to reset
+  #     their package index at load time. Useful when the APK corresponds to
+  #     a library that is loaded at runtime, like system_webview_apk or
+  #     monochrome_apk.
+  #
+  #   app_as_shared_lib: (optional)
+  #     If true, same effect as shared_resources, but also ensures that the
+  #     resources can be used by the APK when it is loaded as a regular
+  #     application as well. Useful for the monochrome_public_apk target
+  #     which is both an application and a shared runtime library that
+  #     implements the system webview feature.
+  #
+  #   shared_resources_allowlist: (optional)
+  #     Path to an R.txt file. If provided, acts similar to shared_resources
+  #     except that it restricts the list of non-final resource variables
+  #     to the list from the input R.txt file. Overrides shared_resources
+  #     when both are specified.
+  #
+  #   shared_resources_allowlist_locales: (optional)
+  #     If shared_resources_allowlist is used, provide an optional list of
+  #     Chromium locale names to determine which localized shared string
+  #     resources to put in the final output, even if aapt_locale_allowlist
+  #     is defined to a smaller subset.
+  #
+  #   aapt_locale_allowlist: (optional)
+  #     Restrict compiled locale-dependent resources to a specific allowlist.
+  #     NOTE: This is a list of Chromium locale names, not Android ones.
+  #
+  #   r_java_root_package_name: (optional)
+  #     Short package name for this target's root R java file (ex. input of
+  #     "base" would become "gen.base_module" for the root R java package name).
+  #     Optional as defaults to "base".
+  #
+  #   resource_exclusion_regex: (optional)
+  #
+  #   resource_exclusion_exceptions: (optional)
+  #
+  #   resource_values_filter_rules: (optional)
+  #
+  #   no_xml_namespaces: (optional)
+  #
+  #   png_to_webp: (optional)
+  #     If true, convert all PNG resources (except 9-patch files) to WebP.
+  #
+  #   post_process_script: (optional)
+  #
+  #   package_name: (optional)
+  #     Name of the package for the purpose of creating R class.
+  #
+  #   package_id: (optional)
+  #     Use a custom package ID in resource IDs.
+  #
+  #   arsc_package_name: (optional)
+  #     Use this package name in the arsc file rather than the package name
+  #     found in the AndroidManifest.xml. Does not affect the package name
+  #     used in AndroidManifest.xml.
+  #
+  #   resource_ids_provider_dep: (optional)
+  #     Use resource IDs provided by another APK target when compiling resources
+  #     (via. "aapt2 link --stable-ids")
+  #
+  #
+  # Output variables:
+  #   arsc_output: Path to output .ap_ file (optional).
+  #
+  #   proto_output: Path to output .proto.ap_ file (optional).
+  #
+  #   r_text_out_path: (optional):
+  #       Path for the corresponding generated R.txt file.
+  #
+  #   proguard_file: (optional)
+  #       Path to proguard configuration file for this apk target.
+  #
+  #   proguard_file_main_dex: (optional)
+  #
+  template("compile_resources") {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+    _deps = [
+      invoker.android_sdk_dep,
+      invoker.build_config_dep,
+    ]
+    if (defined(invoker.android_manifest_dep)) {
+      _deps += [ invoker.android_manifest_dep ]
+    }
+    foreach(_dep, invoker.deps) {
+      _target_label = get_label_info(_dep, "label_no_toolchain")
+      if (filter_exclude([ _target_label ], _java_library_patterns) == [] &&
+          filter_exclude([ _target_label ], _java_resource_patterns) != []) {
+        # Depend on the java libraries' transitive __assetres target instead.
+        _deps += [ "${_target_label}__assetres" ]
+      } else {
+        _deps += [ _dep ]
+      }
+    }
+
+    if (defined(invoker.arsc_output)) {
+      _arsc_output = invoker.arsc_output
+    }
+    _final_srcjar_path = "${target_gen_dir}/${target_name}.srcjar"
+
+    _script = "//build/android/gyp/compile_resources.py"
+
+    _inputs = [
+      invoker.build_config,
+      android_sdk_tools_bundle_aapt2,
+    ]
+
+    _rebased_build_config = rebase_path(invoker.build_config, root_build_dir)
+
+    _args = [
+      "--include-resources=@FileArg($_rebased_build_config:android:sdk_jars)",
+      "--aapt2-path",
+      rebase_path(android_sdk_tools_bundle_aapt2, root_build_dir),
+      "--dependencies-res-zips=@FileArg($_rebased_build_config:deps_info:dependency_zips)",
+      "--extra-res-packages=@FileArg($_rebased_build_config:deps_info:extra_package_names)",
+      "--extra-main-r-text-files=@FileArg($_rebased_build_config:deps_info:extra_main_r_text_files)",
+      "--min-sdk-version=${invoker.min_sdk_version}",
+      "--target-sdk-version=${invoker.target_sdk_version}",
+      "--webp-cache-dir=obj/android-webp-cache",
+    ]
+
+    _inputs += [ invoker.android_manifest ]
+    _outputs = [ _final_srcjar_path ]
+    _args += [
+      "--android-manifest",
+      rebase_path(invoker.android_manifest, root_build_dir),
+      "--srcjar-out",
+      rebase_path(_final_srcjar_path, root_build_dir),
+    ]
+    if (defined(invoker.no_xml_namespaces) && invoker.no_xml_namespaces) {
+      _args += [ "--no-xml-namespaces" ]
+    }
+    if (defined(invoker.version_code)) {
+      _args += [
+        "--version-code",
+        invoker.version_code,
+      ]
+    }
+    if (defined(invoker.version_name)) {
+      _args += [
+        "--version-name",
+        invoker.version_name,
+      ]
+    }
+    if (defined(_arsc_output)) {
+      _outputs += [ _arsc_output ]
+      _args += [
+        "--arsc-path",
+        rebase_path(_arsc_output, root_build_dir),
+      ]
+    }
+    if (defined(invoker.proto_output)) {
+      _outputs += [ invoker.proto_output ]
+      _args += [
+        "--proto-path",
+        rebase_path(invoker.proto_output, root_build_dir),
+      ]
+    }
+    if (defined(invoker.size_info_path)) {
+      _outputs += [ invoker.size_info_path ]
+      _args += [
+        "--info-path",
+        rebase_path(invoker.size_info_path, root_build_dir),
+      ]
+    }
+
+    if (defined(invoker.r_java_root_package_name)) {
+      _args += [
+        "--r-java-root-package-name",
+        invoker.r_java_root_package_name,
+      ]
+    }
+
+    # Useful to have android:debuggable in the manifest even for Release
+    # builds. Just omit it for officai
+    if (debuggable_apks) {
+      _args += [ "--debuggable" ]
+    }
+
+    if (defined(invoker.r_text_out_path)) {
+      _outputs += [ invoker.r_text_out_path ]
+      _args += [
+        "--r-text-out",
+        rebase_path(invoker.r_text_out_path, root_build_dir),
+      ]
+    }
+
+    if (defined(invoker.rename_manifest_package)) {
+      _args += [
+        "--rename-manifest-package",
+        invoker.rename_manifest_package,
+      ]
+    }
+
+    # Define the flags related to shared resources.
+    #
+    # Note the small sanity check to ensure that the package ID of the
+    # generated resources table is correct. It should be 0x02 for runtime
+    # shared libraries, and 0x7f otherwise.
+
+    if (defined(invoker.shared_resources) && invoker.shared_resources) {
+      _args += [ "--shared-resources" ]
+    }
+    if (defined(invoker.app_as_shared_lib) && invoker.app_as_shared_lib) {
+      _args += [ "--app-as-shared-lib" ]
+    }
+    if (defined(invoker.package_id)) {
+      _args += [ "--package-id=${invoker.package_id}" ]
+    }
+    if (defined(invoker.package_name)) {
+      _args += [
+        "--package-name",
+        invoker.package_name,
+      ]
+    }
+    if (defined(invoker.arsc_package_name)) {
+      _args += [
+        "--arsc-package-name",
+        invoker.arsc_package_name,
+      ]
+    }
+
+    if (defined(invoker.shared_resources_allowlist)) {
+      _inputs += [ invoker.shared_resources_allowlist ]
+      _args += [
+        "--shared-resources-allowlist",
+        rebase_path(invoker.shared_resources_allowlist, root_build_dir),
+      ]
+    }
+    if (defined(invoker.shared_resources_allowlist_locales)) {
+      _args += [ "--shared-resources-allowlist-locales=" +
+                 "${invoker.shared_resources_allowlist_locales}" ]
+    }
+
+    if (!defined(testonly) || !testonly ||
+        (defined(invoker.enforce_resource_overlays_in_tests) &&
+         invoker.enforce_resource_overlays_in_tests)) {
+      _args += [ "--dependencies-res-zip-overlays=@FileArg($_rebased_build_config:deps_info:dependency_zip_overlays)" ]
+    } else {
+      _args += [ "--dependencies-res-zip-overlays=@FileArg($_rebased_build_config:deps_info:dependency_zips)" ]
+    }
+
+    if (defined(invoker.proguard_file)) {
+      _outputs += [ invoker.proguard_file ]
+      _args += [
+        "--proguard-file",
+        rebase_path(invoker.proguard_file, root_build_dir),
+      ]
+    }
+
+    if (defined(invoker.proguard_file_main_dex)) {
+      _outputs += [ invoker.proguard_file_main_dex ]
+      _args += [
+        "--proguard-file-main-dex",
+        rebase_path(invoker.proguard_file_main_dex, root_build_dir),
+      ]
+    }
+
+    if (defined(invoker.aapt_locale_allowlist)) {
+      _args += [ "--locale-allowlist=${invoker.aapt_locale_allowlist}" ]
+    }
+    if (defined(invoker.png_to_webp) && invoker.png_to_webp) {
+      _webp_target = "//third_party/libwebp:cwebp($host_toolchain)"
+      _webp_binary = get_label_info(_webp_target, "root_out_dir") + "/cwebp"
+      _deps += [ _webp_target ]
+      _inputs += [ _webp_binary ]
+      _args += [
+        "--png-to-webp",
+        "--webp-binary",
+        rebase_path(_webp_binary, root_build_dir),
+      ]
+    }
+    if (defined(invoker.resource_exclusion_regex)) {
+      _args +=
+          [ "--resource-exclusion-regex=${invoker.resource_exclusion_regex}" ]
+      if (defined(invoker.resource_exclusion_exceptions)) {
+        _args += [ "--resource-exclusion-exceptions=${invoker.resource_exclusion_exceptions}" ]
+      }
+    }
+    if (defined(invoker.resource_values_filter_rules)) {
+      _args +=
+          [ "--values-filter-rules=${invoker.resource_values_filter_rules}" ]
+    }
+
+    if (defined(invoker.include_resource)) {
+      _rebased_include_resources =
+          rebase_path(invoker.include_resource, root_build_dir)
+      _args += [ "--include-resources=$_rebased_include_resources" ]
+    }
+
+    if (defined(invoker._args)) {
+      _args += invoker._args
+    }
+
+    if (defined(invoker.emit_ids_out_path)) {
+      _outputs += [ invoker.emit_ids_out_path ]
+      _rebased_emit_ids_path =
+          rebase_path(invoker.emit_ids_out_path, root_out_dir)
+      _args += [ "--emit-ids-out=$_rebased_emit_ids_path" ]
+    }
+
+    if (defined(invoker.resource_ids_provider_dep)) {
+      _compile_res_dep =
+          "${invoker.resource_ids_provider_dep}__compile_resources"
+      _gen_dir = get_label_info(_compile_res_dep, "target_gen_dir")
+      _name = get_label_info(_compile_res_dep, "name")
+      _resource_ids_path = "$_gen_dir/$_name.resource_ids"
+      _inputs += [ _resource_ids_path ]
+      _rebased_ids_path = rebase_path(_resource_ids_path, root_out_dir)
+      _args += [ "--use-resource-ids-path=$_rebased_ids_path" ]
+      _deps += [ _compile_res_dep ]
+    }
+
+    if (defined(invoker.max_sdk_version)) {
+      _max_sdk_version = invoker.max_sdk_version
+      _args += [ "--max-sdk-version=$_max_sdk_version" ]
+    }
+
+    if (defined(invoker.manifest_package)) {
+      _args += [ "--manifest-package=${invoker.manifest_package}" ]
+    }
+
+    if (defined(invoker.is_bundle_module) && invoker.is_bundle_module) {
+      _args += [ "--is-bundle-module" ]
+    }
+
+    if (defined(invoker.uses_split)) {
+      assert(invoker.is_bundle_module)
+      _args += [ "--uses-split=${invoker.uses_split}" ]
+    }
+
+    if (defined(invoker.expected_android_manifest)) {
+      _expectations_target =
+          "${invoker.top_target_name}_validate_android_manifest"
+      action_with_pydeps(_expectations_target) {
+        _actual_file = "${invoker.android_manifest}.normalized"
+        _failure_file =
+            "$expectations_failure_dir/" +
+            string_replace(invoker.expected_android_manifest, "/", "_")
+        inputs = [
+          invoker.android_manifest,
+          invoker.build_config,
+          invoker.expected_android_manifest,
+        ]
+        outputs = [
+          _actual_file,
+          _failure_file,
+        ]
+        deps = [
+          invoker.android_manifest_dep,
+          invoker.build_config_dep,
+        ]
+        script = _script
+        args = _args + [
+                 "--expected-file",
+                 rebase_path(invoker.expected_android_manifest, root_build_dir),
+                 "--actual-file",
+                 rebase_path(_actual_file, root_build_dir),
+                 "--failure-file",
+                 rebase_path(_failure_file, root_build_dir),
+                 "--only-verify-expectations",
+               ]
+        if (defined(invoker.expected_android_manifest_base)) {
+          args += [
+            "--expected-file-base",
+            rebase_path(invoker.expected_android_manifest_base, root_build_dir),
+          ]
+          inputs += [ invoker.expected_android_manifest_base ]
+        }
+        if (fail_on_android_expectations) {
+          args += [ "--fail-on-expectations" ]
+        }
+        if (defined(invoker.extra_verification_manifest)) {
+          inputs += [ invoker.extra_verification_manifest ]
+          args += [
+            "--extra-verification-manifest",
+            rebase_path(invoker.extra_verification_manifest, root_build_dir),
+          ]
+          if (defined(invoker.extra_verification_manifest_dep)) {
+            deps += [ invoker.extra_verification_manifest_dep ]
+          }
+        }
+      }
+      _deps += [ ":$_expectations_target" ]
+    }
+
+    action_with_pydeps(target_name) {
+      script = _script
+      depfile = "$target_gen_dir/${target_name}.d"
+      inputs = _inputs
+      outputs = _outputs
+      deps = _deps
+      args = _args + [
+               "--depfile",
+               rebase_path(depfile, root_build_dir),
+             ]
+    }
+  }
+
+  # A template that is used to optimize compiled resources using aapt2 optimize.
+  #
+  #   proto_input_path:
+  #     Path to input compiled .proto.ap_ file.
+  #
+  #   short_resource_paths: (optional)
+  #     Rename the paths within a the apk to be randomly generated short
+  #     strings to reduce binary size.
+  #
+  #   strip_resource_names: (optional)
+  #     Strip resource names from the resources table of the apk.
+  #
+  #   resources_configs_paths: (optional)
+  #     List of resource configs to use for optimization.
+  #
+  #   optimized_proto_output:
+  #     Path to output optimized .proto.ap_ file.
+  #
+  #   resources_path_map_out_path: (optional):
+  #       Path for the generated map between original resource paths and
+  #       shortened resource paths.
+  template("optimize_resources") {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, [ "deps" ])
+      script = "//build/android/gyp/optimize_resources.py"
+      outputs = [ invoker.optimized_proto_output ]
+      inputs = [
+        android_sdk_tools_bundle_aapt2,
+        invoker.r_text_path,
+        invoker.proto_input_path,
+      ]
+      args = [
+        "--aapt2-path",
+        rebase_path(android_sdk_tools_bundle_aapt2, root_build_dir),
+        "--r-text-in",
+        rebase_path(invoker.r_text_path, root_build_dir),
+        "--proto-path",
+        rebase_path(invoker.proto_input_path, root_build_dir),
+        "--optimized-proto-path",
+        rebase_path(invoker.optimized_proto_output, root_build_dir),
+      ]
+
+      if (defined(invoker.resources_config_paths)) {
+        inputs += invoker.resources_config_paths
+        _rebased_resource_configs =
+            rebase_path(invoker.resources_config_paths, root_build_dir)
+        args += [ "--resources-config-paths=${_rebased_resource_configs}" ]
+      }
+
+      if (defined(invoker.short_resource_paths) &&
+          invoker.short_resource_paths) {
+        args += [ "--short-resource-paths" ]
+        if (defined(invoker.resources_path_map_out_path)) {
+          outputs += [ invoker.resources_path_map_out_path ]
+          args += [
+            "--resources-path-map-out-path",
+            rebase_path(invoker.resources_path_map_out_path, root_build_dir),
+          ]
+        }
+      }
+
+      if (defined(invoker.strip_resource_names) &&
+          invoker.strip_resource_names) {
+        args += [ "--strip-resource-names" ]
+      }
+    }
+  }
+
+  # A template that is used to find unused resources.
+  template("unused_resources") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "deps" ])
+      script = "//build/android/gyp/unused_resources.py"
+      depfile = "$target_gen_dir/${target_name}.d"
+      _unused_resources_script = "$root_build_dir/bin/helper/unused_resources"
+      inputs = [ _unused_resources_script ]
+      outputs = [ invoker.output_config ]
+      if (!defined(deps)) {
+        deps = []
+      }
+      deps += [ "//build/android/unused_resources:unused_resources" ]
+      _rebased_module_build_config =
+          rebase_path(invoker.build_config, root_build_dir)
+      args = [
+        "--script",
+        rebase_path(_unused_resources_script, root_build_dir),
+        "--output-config",
+        rebase_path(invoker.output_config, root_build_dir),
+        "--r-text=@FileArg($_rebased_module_build_config:deps_info:r_text_path)",
+        "--dependencies-res-zips=@FileArg($_rebased_module_build_config:deps_info:dependency_zips)",
+        "--depfile",
+        rebase_path(depfile, root_build_dir),
+      ]
+
+      if (defined(invoker.proguard_mapping_path)) {
+        inputs += [ invoker.proguard_mapping_path ]
+        args += [
+          "--proguard-mapping",
+          rebase_path(invoker.proguard_mapping_path, root_build_dir),
+        ]
+      }
+
+      foreach(_build_config, invoker.all_module_build_configs) {
+        inputs += [ _build_config ]
+        _rebased_build_config = rebase_path(_build_config, root_build_dir)
+        args += [
+          "--dexes=@FileArg($_rebased_build_config:final_dex:path)",
+          "--android-manifests=@FileArg($_rebased_build_config:deps_info:merged_android_manifest)",
+        ]
+      }
+    }
+  }
+
+  # Create an .jar.info file by merging several .jar.info files into one.
+  #
+  # Variables:
+  #   build_config: Path to APK's build config file. Used to extract the
+  #       list of input .jar files from its dependencies.
+  #   name: Name of the apk or app bundle (e.g. "Foo.apk").
+  #   res_size_info_path: Path to input .ap_.info file (for apks).
+  #
+  template("create_size_info_files") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "deps" ])
+      script = "//build/android/gyp/create_size_info_files.py"
+      _jar_info_path = "$root_build_dir/size-info/${invoker.name}.jar.info"
+      _pak_info_path = "$root_build_dir/size-info/${invoker.name}.pak.info"
+      _res_info_path = "$root_build_dir/size-info/${invoker.name}.res.info"
+      outputs = [
+        _jar_info_path,
+        _pak_info_path,
+        _res_info_path,
+      ]
+      depfile = "$target_gen_dir/$target_name.d"
+      args = [
+        "--depfile",
+        rebase_path(depfile, root_build_dir),
+        "--jar-info-path",
+        rebase_path(_jar_info_path, root_build_dir),
+        "--pak-info-path",
+        rebase_path(_pak_info_path, root_build_dir),
+        "--res-info-path",
+        rebase_path(_res_info_path, root_build_dir),
+      ]
+      _is_bundle = defined(invoker.module_build_configs)
+      if (_is_bundle) {
+        inputs = invoker.module_build_configs
+        foreach(_build_config, invoker.module_build_configs) {
+          _rebased_build_config = rebase_path(_build_config, root_build_dir)
+          args += [
+            "--jar-files=@FileArg($_rebased_build_config:deps_info:unprocessed_jar_path)",
+            "--jar-files=@FileArg($_rebased_build_config:deps_info:javac_full_classpath)",
+            "--in-res-info-path=@FileArg($_rebased_build_config:deps_info:res_size_info)",
+            "--assets=@FileArg($_rebased_build_config:assets)",
+            "--uncompressed-assets=@FileArg($_rebased_build_config:uncompressed_assets)",
+          ]
+        }
+      } else {
+        inputs = [
+          invoker.build_config,
+          invoker.res_size_info_path,
+        ]
+        _rebased_build_config =
+            rebase_path(invoker.build_config, root_build_dir)
+        args += [
+          "--jar-files=@FileArg($_rebased_build_config:deps_info:unprocessed_jar_path)",
+          "--jar-files=@FileArg($_rebased_build_config:deps_info:javac_full_classpath)",
+          "--in-res-info-path",
+          rebase_path(invoker.res_size_info_path, root_build_dir),
+          "--assets=@FileArg($_rebased_build_config:assets)",
+          "--uncompressed-assets=@FileArg($_rebased_build_config:uncompressed_assets)",
+        ]
+      }
+    }
+  }
+
+  # Creates a signed and aligned .apk.
+  #
+  # Variables
+  #   apk_name: (optional) APK name (without .apk suffix). If provided, will
+  #       be used to generate .info files later used by the supersize tool.
+  #   assets_build_config: Path to android_apk .build_config.json containing merged
+  #       asset information.
+  #   deps: Specifies the dependencies of this target.
+  #   dex_path: Path to classes.dex file to include (optional).
+  #   expected_libs_and_assets: Verify the list of included native libraries
+  #     and assets is consistent with the given expectation file.
+  #   expected_libs_and_assets_base: Treat expected_libs_and_assets as a diff
+  #     with this file as the base.
+  #   jdk_libs_dex: Path to classes.dex for desugar_jdk_libs.
+  #   packaged_resources_path: Path to .ap_ to use.
+  #   output_apk_path: Output path for the generated .apk.
+  #   min_sdk_version: The minimum Android SDK version this target supports.
+  #   native_lib_placeholders: List of placeholder filenames to add to the apk
+  #     (optional).
+  #   secondary_native_lib_placeholders: List of placeholder filenames to add to
+  #     the apk for the secondary ABI (optional).
+  #   loadable_modules: List of native libraries.
+  #   native_libs_filearg: @FileArg() of additionally native libraries.
+  #   secondary_abi_loadable_modules: (optional) List of native libraries for
+  #     secondary ABI.
+  #   secondary_abi_native_libs_filearg: (optional). @FileArg() of additional
+  #     secondary ABI native libs.
+  #   keystore_path: Path to keystore to use for signing.
+  #   keystore_name: Key alias to use.
+  #   keystore_password: Keystore password.
+  #   uncompress_shared_libraries: (optional, default false) Whether to store
+  #     native libraries inside the APK uncompressed and page-aligned.
+  template("package_apk") {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "public_deps" ])
+    _deps = invoker.deps
+    _native_lib_placeholders = []
+    if (defined(invoker.native_lib_placeholders)) {
+      _native_lib_placeholders = invoker.native_lib_placeholders
+    }
+    _secondary_native_lib_placeholders = []
+    if (defined(invoker.secondary_native_lib_placeholders)) {
+      _secondary_native_lib_placeholders =
+          invoker.secondary_native_lib_placeholders
+    }
+
+    _script = "//build/android/gyp/apkbuilder.py"
+    _apksigner = "$android_sdk_build_tools/lib/apksigner.jar"
+    _zipalign = "$android_sdk_build_tools/zipalign"
+
+    _inputs = [
+      invoker.build_config,
+      invoker.keystore_path,
+      invoker.packaged_resources_path,
+      _apksigner,
+      _zipalign,
+    ]
+
+    _outputs = [ invoker.output_apk_path ]
+    _data = [ invoker.output_apk_path ]
+
+    _rebased_compiled_resources_path =
+        rebase_path(invoker.packaged_resources_path, root_build_dir)
+    _rebased_packaged_apk_path =
+        rebase_path(invoker.output_apk_path, root_build_dir)
+    _rebased_build_config = rebase_path(invoker.build_config, root_build_dir)
+    _args = [
+      "--resource-apk=$_rebased_compiled_resources_path",
+      "--output-apk=$_rebased_packaged_apk_path",
+      "--assets=@FileArg($_rebased_build_config:assets)",
+      "--uncompressed-assets=@FileArg($_rebased_build_config:uncompressed_assets)",
+      "--apksigner-jar",
+      rebase_path(_apksigner, root_build_dir),
+      "--zipalign-path",
+      rebase_path(_zipalign, root_build_dir),
+      "--key-path",
+      rebase_path(invoker.keystore_path, root_build_dir),
+      "--key-name",
+      invoker.keystore_name,
+      "--key-passwd",
+      invoker.keystore_password,
+      "--min-sdk-version=${invoker.min_sdk_version}",
+
+      # TODO(mlopatkin) We are relying on the fact that build_config is an APK
+      # build_config.
+      "--java-resources=@FileArg($_rebased_build_config:java_resources_jars)",
+    ]
+    if (is_official_build) {
+      _args += [ "--best-compression" ]
+    }
+    if (defined(invoker.uncompress_dex) && invoker.uncompress_dex) {
+      _args += [ "--uncompress-dex" ]
+    }
+    if (defined(invoker.uncompress_shared_libraries) &&
+        invoker.uncompress_shared_libraries) {
+      _args += [ "--uncompress-shared-libraries=True" ]
+    }
+    if (defined(invoker.library_always_compress)) {
+      _args +=
+          [ "--library-always-compress=${invoker.library_always_compress}" ]
+    }
+    if (defined(invoker.library_renames)) {
+      _args += [ "--library-renames=${invoker.library_renames}" ]
+    }
+    if (defined(invoker.dex_path)) {
+      _inputs += [ invoker.dex_path ]
+      _args += [
+        "--dex-file",
+        rebase_path(invoker.dex_path, root_build_dir),
+      ]
+    }
+    if (defined(invoker.jdk_libs_dex)) {
+      _inputs += [ invoker.jdk_libs_dex ]
+      _args += [
+        "--jdk-libs-dex-file",
+        rebase_path(invoker.jdk_libs_dex, root_build_dir),
+      ]
+    }
+    if ((defined(invoker.loadable_modules) && invoker.loadable_modules != []) ||
+        defined(invoker.native_libs_filearg) ||
+        _native_lib_placeholders != []) {
+      _args += [ "--android-abi=$android_app_abi" ]
+    }
+    if (defined(android_app_secondary_abi)) {
+      _args += [ "--secondary-android-abi=$android_app_secondary_abi" ]
+    }
+    if (defined(invoker.loadable_modules) && invoker.loadable_modules != []) {
+      _inputs += invoker.loadable_modules
+      _rebased_loadable_modules =
+          rebase_path(invoker.loadable_modules, root_build_dir)
+      _args += [ "--native-libs=$_rebased_loadable_modules" ]
+    }
+    if (defined(invoker.native_libs_filearg)) {
+      _args += [ "--native-libs=${invoker.native_libs_filearg}" ]
+    }
+    if (_native_lib_placeholders != []) {
+      _args += [ "--native-lib-placeholders=$_native_lib_placeholders" ]
+    }
+
+    if (defined(invoker.secondary_abi_native_libs_filearg)) {
+      _args += [
+        "--secondary-native-libs=${invoker.secondary_abi_native_libs_filearg}",
+      ]
+    }
+    if (defined(invoker.secondary_abi_loadable_modules)) {
+      _rebased_secondary_abi_loadable_modules =
+          rebase_path(invoker.secondary_abi_loadable_modules, root_build_dir)
+      _args +=
+          [ "--secondary-native-libs=$_rebased_secondary_abi_loadable_modules" ]
+    }
+    if (_secondary_native_lib_placeholders != []) {
+      _args += [ "--secondary-native-lib-placeholders=$_secondary_native_lib_placeholders" ]
+    }
+    if (treat_warnings_as_errors) {
+      _args += [ "--warnings-as-errors" ]
+    }
+
+    if (defined(invoker.expected_libs_and_assets)) {
+      _expectations_target =
+          "${invoker.top_target_name}_validate_libs_and_assets"
+      action_with_pydeps(_expectations_target) {
+        _actual_file = "$target_gen_dir/$target_name.libs_and_assets"
+        _failure_file =
+            "$expectations_failure_dir/" +
+            string_replace(invoker.expected_libs_and_assets, "/", "_")
+        inputs = [
+          invoker.build_config,
+          invoker.expected_libs_and_assets,
+        ]
+        deps = [ invoker.build_config_dep ]
+        outputs = [
+          _actual_file,
+          _failure_file,
+        ]
+        script = _script
+        args = _args + [
+                 "--expected-file",
+                 rebase_path(invoker.expected_libs_and_assets, root_build_dir),
+                 "--actual-file",
+                 rebase_path(_actual_file, root_build_dir),
+                 "--failure-file",
+                 rebase_path(_failure_file, root_build_dir),
+                 "--only-verify-expectations",
+               ]
+        if (defined(invoker.expected_libs_and_assets_base)) {
+          inputs += [ invoker.expected_libs_and_assets_base ]
+          args += [
+            "--expected-file-base",
+            rebase_path(invoker.expected_libs_and_assets_base, root_build_dir),
+          ]
+        }
+        if (fail_on_android_expectations) {
+          args += [ "--fail-on-expectations" ]
+        }
+      }
+      _deps += [ ":$_expectations_target" ]
+    }
+    action_with_pydeps(target_name) {
+      depfile = "$target_gen_dir/$target_name.d"
+      inputs = _inputs
+      deps = _deps
+      data = _data
+      outputs = _outputs
+      script = _script
+      args = _args + [
+               "--depfile",
+               rebase_path(depfile, root_build_dir),
+             ]
+    }
+  }
+
+  # Compile Java source files into a .jar file, potentially using an
+  # annotation processor, and/or the errorprone compiler.
+  #
+  # Note that the only way to specify custom annotation processors is
+  # by using build_config to point to a file that corresponds to a java-related
+  # target that includes javac:processor_classes entries (i.e. there is no
+  # variable here that can be used for this purpose).
+  #
+  # Note also the peculiar use of java_files / java_sources_file. The content
+  # of the java_files list and the java_sources_file file must match exactly.
+  # This rule uses java_files only to list the inputs to the action that
+  # calls compile_java.py, but will pass the list of Java source files
+  # with the '@${java_sources_file}" command-line syntax. Not a problem in
+  # practice since this is only called from java_library_impl() that sets up
+  # the variables properly.
+  #
+  # Variables:
+  #  main_target_name: Used when extracting srcjars for codesearch.
+  #  java_files: Optional list of Java source file paths.
+  #  srcjar_deps: Optional list of .srcjar dependencies (not file paths).
+  #    The corresponding source files they contain will be compiled too.
+  #  java_sources_file: Optional path to file containing list of Java source
+  #    file paths. This must always be provided if java_files is not empty
+  #    and must match it exactly.
+  #  build_config: Path to the .build_config.json file of the corresponding
+  #    java_library_impl() target. The following entries will be used by this
+  #    template: javac:srcjars, deps_info:javac_full_classpath,
+  #    deps_info:javac_full_interface_classpath, javac:processor_classpath,
+  #    javac:processor_classes
+  #  javac_jar_path: Path to the final output .jar file.
+  #  javac_args: Optional list of extra arguments to pass to javac.
+  #  chromium_code: Whether this corresponds to Chromium-specific sources.
+  #  requires_android: True if these sources can only run on Android.
+  #  additional_jar_files: Optional list of files to copy into the resulting
+  #    .jar file (by default, only .class files are put there). Each entry
+  #    has the 'srcPath:dstPath' format.
+  #  enable_errorprone: If True, use the errorprone compiler to check for
+  #    error-prone constructs in the language. If not provided, whether this is
+  #    enabled depends on chromium_code and the global
+  #    use_errorprone_java_compiler variable.
+  #  use_turbine: If True, compile headers using turbine.py.
+  #  apk_name: Optional APK name. If provided, will tell compile_java.py to also
+  #    generate an .apk.jar.info file under size-info/${apk_name}.apk.jar.info
+  #  processor_args_javac: List of annotation processor arguments, each one
+  #    will be passed to javac as -A<entry>.
+  #  deps: Dependencies for the corresponding target.
+  #  testonly: Usual meaning (should be True for test-only targets)
+  #
+  # [1] https://docs.oracle.com/javase/7/docs/api/java/util/ServiceLoader.html
+  #
+  template("compile_java") {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+    _build_config = invoker.build_config
+    _chromium_code = invoker.chromium_code
+
+    _processor_args = []
+    if (defined(invoker.processor_args_javac)) {
+      _processor_args = invoker.processor_args_javac
+    }
+
+    _additional_jar_files = []
+    if (defined(invoker.additional_jar_files)) {
+      _additional_jar_files = invoker.additional_jar_files
+    }
+
+    _srcjar_deps = []
+    if (defined(invoker.srcjar_deps)) {
+      _srcjar_deps += invoker.srcjar_deps
+    }
+
+    _java_srcjars = []
+    foreach(dep, _srcjar_deps) {
+      _dep_gen_dir = get_label_info(dep, "target_gen_dir")
+      _dep_name = get_label_info(dep, "name")
+      _java_srcjars += [ "$_dep_gen_dir/$_dep_name.srcjar" ]
+    }
+
+    # generated_jar_path is an output when use_turbine and an input otherwise.
+    if (!invoker.use_turbine) {
+      _java_srcjars += [ invoker.generated_jar_path ]
+    }
+
+    _javac_args = []
+    if (defined(invoker.javac_args)) {
+      _javac_args = invoker.javac_args
+    }
+
+    action_with_pydeps(target_name) {
+      if (invoker.use_turbine) {
+        script = "//build/android/gyp/turbine.py"
+      } else {
+        script = "//build/android/gyp/compile_java.py"
+      }
+
+      if (target_name == "chrome_java__header") {
+        # Regression test for: https://crbug.com/1154302
+        assert_no_deps = [ "//base:base_java__impl" ]
+      }
+
+      depfile = "$target_gen_dir/$target_name.d"
+      deps = _srcjar_deps
+      if (defined(invoker.deps)) {
+        deps += invoker.deps
+      }
+
+      outputs = [ invoker.output_jar_path ]
+      if (!invoker.enable_errorprone && !invoker.use_turbine) {
+        outputs += [ invoker.output_jar_path + ".info" ]
+      }
+      inputs = invoker.java_files + _java_srcjars + [ _build_config ]
+      if (invoker.java_files != []) {
+        inputs += [ invoker.java_sources_file ]
+      }
+
+      _rebased_build_config = rebase_path(_build_config, root_build_dir)
+      _rebased_output_jar_path =
+          rebase_path(invoker.output_jar_path, root_build_dir)
+      _rebased_java_srcjars = rebase_path(_java_srcjars, root_build_dir)
+      _rebased_depfile = rebase_path(depfile, root_build_dir)
+      _rebased_generated_dir = rebase_path(
+              "$target_gen_dir/${invoker.main_target_name}/generated_java",
+              root_build_dir)
+      args = [
+        "--depfile=$_rebased_depfile",
+        "--generated-dir=$_rebased_generated_dir",
+        "--jar-path=$_rebased_output_jar_path",
+        "--java-srcjars=$_rebased_java_srcjars",
+        "--target-name",
+        get_label_info(":${target_name}", "label_no_toolchain"),
+      ]
+
+      if (defined(invoker.header_jar_path)) {
+        inputs += [ invoker.header_jar_path ]
+        args += [
+          "--header-jar",
+          rebase_path(invoker.header_jar_path, root_build_dir),
+        ]
+        _header_jar_classpath =
+            [ rebase_path(invoker.header_jar_path, root_build_dir) ]
+        args += [ "--classpath=$_header_jar_classpath" ]
+      }
+
+      if (invoker.use_turbine) {
+        # Prefer direct deps for turbine as much as possible.
+        args += [ "--classpath=@FileArg($_rebased_build_config:javac:interface_classpath)" ]
+      } else {
+        args += [ "--classpath=@FileArg($_rebased_build_config:deps_info:javac_full_interface_classpath)" ]
+      }
+
+      if (invoker.use_turbine) {
+        args += [
+          "--processorpath=@FileArg($_rebased_build_config:javac:processor_classpath)",
+          "--processors=@FileArg($_rebased_build_config:javac:processor_classes)",
+        ]
+      }
+
+      if (invoker.use_turbine) {
+        _turbine_jar_path = "//third_party/turbine/turbine.jar"
+        inputs += [ _turbine_jar_path ]
+        outputs += [ invoker.generated_jar_path ]
+        args += [
+          "--turbine-jar-path",
+          rebase_path(_turbine_jar_path, root_build_dir),
+          "--generated-jar-path",
+          rebase_path(invoker.generated_jar_path, root_build_dir),
+        ]
+      }
+
+      # Currently turbine does not support JDK11.
+      if (invoker.supports_android || invoker.use_turbine) {
+        args += [ "--java-version=1.8" ]
+      }
+      if (use_java_goma) {
+        args += [ "--gomacc-path=$goma_dir/gomacc" ]
+
+        # Override the default action_pool when goma is enabled.
+        pool = "//build/config/android:goma_javac_pool"
+      }
+
+      # Flag enable_kythe_annotations requires
+      # checkout_android_prebuilts_build_tools=True in .gclient.
+      if (enable_kythe_annotations && !invoker.enable_errorprone) {
+        args += [ "--enable-kythe-annotations" ]
+      }
+      if (invoker.requires_android) {
+        args += [ "--bootclasspath=@FileArg($_rebased_build_config:android:sdk_interface_jars)" ]
+      }
+      if (_chromium_code) {
+        args += [ "--chromium-code=1" ]
+        if (treat_warnings_as_errors) {
+          args += [ "--warnings-as-errors" ]
+        }
+      }
+      if (defined(invoker.jar_excluded_patterns)) {
+        args += [ "--jar-info-exclude-globs=${invoker.jar_excluded_patterns}" ]
+      }
+
+      if (invoker.enable_errorprone) {
+        # Our custom plugin pulls in the main errorprone dep transitively.
+        _errorprone_dep = "//tools/android/errorprone_plugin:errorprone_plugin"
+        deps += [ _errorprone_dep ]
+        _dep_gen_dir = get_label_info(_errorprone_dep, "target_gen_dir")
+        _dep_name = get_label_info(_errorprone_dep, "name")
+        _rebased_errorprone_buildconfig =
+            rebase_path("$_dep_gen_dir/$_dep_name.build_config.json",
+                        root_build_dir)
+        args += [
+          "--processorpath=@FileArg($_rebased_errorprone_buildconfig:deps_info:host_classpath)",
+          "--enable-errorprone",
+        ]
+      }
+      if (defined(invoker.skip_build_server) && invoker.skip_build_server) {
+        # Nocompile tests need lint to fail through ninja.
+        args += [ "--skip-build-server" ]
+      }
+
+      foreach(e, _processor_args) {
+        args += [ "--processor-arg=" + e ]
+      }
+
+      foreach(file_tuple, _additional_jar_files) {
+        # Each element is of length two, [ path_to_file, path_to_put_in_jar ]
+        inputs += [ file_tuple[0] ]
+        args +=
+            [ "--additional-jar-file=" +
+              rebase_path(file_tuple[0], root_build_dir) + ":" + file_tuple[1] ]
+      }
+      if (invoker.java_files != []) {
+        args += [ "@" + rebase_path(invoker.java_sources_file, root_build_dir) ]
+      }
+      foreach(e, _javac_args) {
+        args += [ "--javac-arg=" + e ]
+      }
+    }
+  }
+
+  template("java_lib_group") {
+    forward_variables_from(invoker, [ "testonly" ])
+    _group_name = invoker.group_name
+    not_needed([ "_group_name" ])
+    group(target_name) {
+      if (defined(invoker.deps)) {
+        deps = []
+        foreach(_dep, invoker.deps) {
+          _target_label = get_label_info(_dep, "label_no_toolchain")
+          if (filter_exclude([ _target_label ], _java_library_patterns) == [] &&
+              filter_exclude([ _target_label ], _java_resource_patterns) !=
+              []) {
+            # This is a java library dep, so replace it.
+            deps += [ "${_target_label}__${_group_name}" ]
+          } else {
+            # Transitive java group targets should also include direct deps.
+            deps += [ _dep ]
+          }
+        }
+      }
+    }
+  }
+
+  # Create an interface jar from a normal jar.
+  #
+  # Variables
+  #   input_jar: Path to input .jar.
+  #   output_jar: Path to output .ijar.
+  #
+  template("generate_interface_jar") {
+    action_with_pydeps(target_name) {
+      _ijar_target = "//third_party/ijar:ijar($host_toolchain)"
+      _ijar_executable = get_label_info(_ijar_target, "root_out_dir") + "/ijar"
+      forward_variables_from(invoker,
+                             TESTONLY_AND_VISIBILITY + [
+                                   "data",
+                                   "data_deps",
+                                   "public_deps",
+                                 ])
+      script = "//build/android/gyp/ijar.py"
+      deps = [ _ijar_target ]
+      if (defined(invoker.deps)) {
+        deps += invoker.deps
+      }
+      inputs = [
+        invoker.input_jar,
+        _ijar_executable,
+      ]
+      if (defined(invoker.inputs)) {
+        inputs += invoker.inputs
+      }
+      outputs = [ invoker.output_jar ]
+      args = [
+        rebase_path(_ijar_executable, root_build_dir),
+        rebase_path(invoker.input_jar, root_build_dir),
+        rebase_path(invoker.output_jar, root_build_dir),
+      ]
+    }
+  }
+
+  # A rule that will handle multiple Java-related targets.
+  #
+  # The caller can provide a list of source files with 'java_files'
+  # and 'srcjar_deps', or a prebuilt .jar file through 'jar_path'.
+  #
+  # In the case of a 'java_binary' target type, it can even provide none of
+  # that (and the rule will just generate its wrapper script).
+  #
+  # The template will process the input .jar file (either the prebuilt one,
+  # or the result of compiling the sources), for example to apply Proguard,
+  # but also other ranges of bytecode-level rewriting schemes.
+  #
+  # Variables:
+  #  type: type of Java target, valid values: 'java_library', 'java_binary',
+  #    'junit_binary', 'java_annotation_processor', and 'android_apk'
+  #  main_target_name: optional. If provided, overrides target_name when
+  #    creating sub-targets (e.g. "${main_target_name}__dex") and
+  #    some output files (e.g. "${main_target_name}.sources"). Only used
+  #    for 'android_apk' types at the moment, where main_target_name will
+  #    be the name of the main APK target.
+  #  supports_android: Optional. True if target can run on Android.
+  #  requires_android: Optional. True if target can only run on Android.
+  #  java_files: Optional list of Java source file paths for this target.
+  #  javac_args: Optional list of extra arguments to pass to javac.
+  #  errorprone_args: Optional list of extra arguments to pass to.
+  #  srcjar_deps: Optional list of .srcjar targets (not file paths). The Java
+  #    source files they contain will also be compiled for this target.
+  #  java_sources_file: Optional path to a file which will be written with
+  #    the content of java_files. If not provided, the file will be written
+  #    under $target_gen_dir/$main_target_name.sources. Ignored if
+  #    java_files is empty. If not
+  #  jar_path: Optional path to a prebuilt .jar file for this target.
+  #    Mutually exclusive with java_files and srcjar_deps.
+  #  output_name: Optional output name for the final jar path. Used to
+  #    determine the name of the final jar. Default is to use the same
+  #    name as jar_path, if provided, or main_target_name.
+  #  main_class: Main Java class name for 'java_binary', 'junit_binary' and
+  #    'java_annotation_processor' target types. Should not be set for other
+  #    ones.
+  #  deps: Dependencies for this target.
+  #  public_deps: Dependencies that this target exposes as part of its public API.
+  #    public_deps do not need to be listed in both the 'deps' and 'public_deps' lists.
+  #  testonly: True iff target should only be used for tests.
+  #  chromium_code: Optional. Whether this is Chromium-specific code. If not
+  #    provided, this is determined automatically, based on the location of
+  #    the source files (i.e. anything under third_party/ is not
+  #    Chromium-specific unless it is in a 'chromium' sub-directory).
+  #  jacoco_never_instrument: Optional. If provided, whether to forbid
+  #    instrumentation with the Jacoco coverage processor. If not provided,
+  #    this is controlled by the global use_jacoco_coverage build arg variable
+  #    and only used for non-test Chromium code.
+  #  include_android_sdk: Optional. Whether or not the android SDK dep
+  #    should be added to deps. Defaults to true for non-system libraries
+  #    that support android.
+  #  alternative_android_sdk_dep: Optional. Alternative Android system
+  #    android java target to use.
+  #  annotation_processor_deps: Optional list of dependencies corresponding
+  #    to annotation processors used to compile these sources.
+  #  input_jars_paths: Optional list of additional .jar file paths, which will
+  #    be added to the compile-time classpath when building this target (but
+  #    not to the runtime classpath).
+  #  desugar_jars_paths: Optional list of additional .jar file paths, which will
+  #    be added to the desugar classpath when building this target (but not to
+  #    any other classpath). This is only used to break dependency cycles.
+  #  gradle_treat_as_prebuilt: Cause generate_gradle.py to reference this
+  #    library via its built .jar rather than including its .java sources.
+  #  proguard_enabled: Optional. True to enable ProGuard obfuscation.
+  #  proguard_configs: Optional list of additional proguard config file paths.
+  #  bypass_platform_checks: Optional. If True, platform checks will not
+  #    be performed. They are used to verify that every target with
+  #    requires_android only depends on targets that, at least supports_android.
+  #    Similarly, if a target has !supports_android, then it cannot depend on
+  #    any other target that has requires_android.
+  #  include_java_resources: Optional. If True, include Java (not Android)
+  #    resources into final .jar file.
+  #  jar_excluded_patterns: Optional list of .class file patterns to exclude
+  #    from the final .jar file.
+  #  jar_included_patterns: Optional list of .class file patterns to include
+  #    in the final .jar file. jar_excluded_patterns take precedence over this.
+  #  low_classpath_priority: Indicates that the library should be placed at the
+  #    end of the classpath. The default classpath order has libraries ordered
+  #    before the libraries that they depend on. 'low_classpath_priority' is
+  #    useful when one java_library() overrides another via
+  #    'jar_excluded_patterns' and the overriding library does not depend on the
+  #    overridee.
+  #
+  # For 'android_apk' and 'android_app_bundle_module' targets only:
+  #
+  #  apk_path: Path to the final APK file.
+  #  android_manifest: Path to AndroidManifest.xml file for the APK.
+  #  android_manifest_dep: Optional. Dependency target that generates
+  #    android_manifest.
+  #  apk_under_test: For 'android_apk' targets used to test other APKs,
+  #    this is the target name of APK being tested.
+  #  incremental_apk_path: Path to the incremental APK.
+  #  incremental_install_json_path: Path to the incremental install json.
+  #  native_lib_placeholders: Optional. List of placeholder filenames to add to
+  #    the APK.
+  #  proguard_mapping_path: Path to .mapping file produced from ProGuard step.
+  #  shared_libraries_runtime_deps_file: Optional. Path to a file listing the
+  #    native shared libraries required at runtime by the APK.
+  #  secondary_abi_shared_libraries_runtime_deps_file:
+  #  secondary_native_lib_placeholders: Optional. List of placeholder filenames
+  #    to add to the APK for the secondary ABI.
+  #  loadable_modules: Optional list of extra native libraries to
+  #    be stored in the APK.
+  #  secondary_abi_loadable_modules: Optional list of native libraries for
+  #    secondary ABI.
+  #  uncompress_shared_libraries: Optional. True to store native shared
+  #    libraries uncompressed and page-aligned.
+  #  proto_resources_path: The path of an zip archive containing the APK's
+  #    resources compiled to the protocol buffer format (instead of regular
+  #    binary xml + resources.arsc).
+  #  r_text_path: The path of the R.txt file generated when compiling the
+  #    resources for this target.
+  #  module_pathmap_path: The path of the pathmap file generated when compiling
+  #    the resources for the bundle module, if path shortening is enabled.
+  #  base_allowlist_rtxt_path: The path of the R.txt file containing the
+  #    list of string resources to keep in the base split APK for any bundle
+  #    that uses this target.
+  #
+  # For 'java_binary' and 'junit_binary' targets only. Ignored by others:
+  #
+  #  wrapper_script_name: Optional name for the generated wrapper script.
+  #    Default is main target name.
+  #  wrapper_script_args: Optional list of extra arguments used by the
+  #    generated wrapper script.
+  #
+  template("java_library_impl") {
+    # TODO(crbug.com/1042017): Remove.
+    not_needed(invoker, [ "no_build_hooks" ])
+
+    forward_variables_from(invoker, [ "testonly" ])
+    _is_prebuilt = defined(invoker.jar_path)
+    _is_annotation_processor = invoker.type == "java_annotation_processor"
+    _is_java_binary =
+        invoker.type == "java_binary" || invoker.type == "junit_binary"
+    _supports_android =
+        defined(invoker.supports_android) && invoker.supports_android
+    _requires_android =
+        defined(invoker.requires_android) && invoker.requires_android
+
+    _invoker_deps = []
+    if (defined(invoker.deps)) {
+      _invoker_deps += invoker.deps
+    }
+    if (defined(invoker.public_deps)) {
+      foreach(_public_dep, invoker.public_deps) {
+        if (filter_include([ _public_dep ], _invoker_deps) != []) {
+          assert(false, "'public_deps' and 'deps' overlap: $_public_dep")
+        }
+      }
+      _invoker_deps += invoker.public_deps
+    }
+
+    _main_target_name = target_name
+    if (defined(invoker.main_target_name)) {
+      _main_target_name = invoker.main_target_name
+    }
+
+    if (defined(invoker.resources_package)) {
+      _resources_package = invoker.resources_package
+    }
+
+    _java_files = []
+    if (defined(invoker.sources)) {
+      _java_files = invoker.sources
+    }
+    _srcjar_deps = []
+    if (defined(invoker.srcjar_deps)) {
+      _srcjar_deps = invoker.srcjar_deps
+    }
+    _has_sources = _java_files != [] || _srcjar_deps != []
+
+    if (_is_prebuilt) {
+      assert(!_has_sources)
+    } else {
+      # Allow java_binary to not specify any sources. This is needed when a prebuilt
+      # is needed as a library as well as a binary.
+      assert(_is_annotation_processor || _is_java_binary || _has_sources)
+    }
+
+    if (_is_java_binary) {
+      assert(defined(invoker.main_class),
+             "${invoker.type}() must set main_class")
+    } else if (_is_annotation_processor) {
+      assert(defined(invoker.main_class),
+             "java_annotation_processor() must set main_class")
+    } else {
+      assert(!defined(invoker.main_class),
+             "main_class cannot be used for target of type ${invoker.type}")
+    }
+
+    if (defined(invoker.chromium_code)) {
+      _chromium_code = invoker.chromium_code
+    } else {
+      # Default based on whether target is in third_party.
+      _chromium_code =
+          filter_exclude([ get_label_info(":$_main_target_name", "dir") ],
+                         [ "*\bthird_party\b*" ]) != []
+      if (!_chromium_code && !_is_prebuilt && _java_files != []) {
+        # Unless third_party code has an org.chromium file in it.
+        _chromium_code =
+            filter_exclude(_java_files, [ "*\bchromium\b*" ]) != _java_files
+      }
+    }
+
+    # Define build_config_deps which will be a list of targets required to
+    # build the _build_config.
+    _build_config = "$target_gen_dir/$_main_target_name.build_config.json"
+    _build_config_target_name =
+        "${_main_target_name}$build_config_target_suffix"
+
+    # The only target that might have no prebuilt and no sources is a java_binary.
+    _build_host_jar = false
+    _build_device_jar = false
+    if (_is_prebuilt || _has_sources) {
+      if (defined(invoker.output_name)) {
+        _output_name = invoker.output_name
+      } else if (_is_prebuilt) {
+        _output_name = get_path_info(invoker.jar_path, "name")
+      } else {
+        _output_name = _main_target_name
+      }
+
+      _build_host_jar = _is_java_binary || _is_annotation_processor ||
+                        invoker.type == "java_library"
+      _build_device_jar =
+          invoker.type != "system_java_library" && _supports_android
+
+      _jacoco_instrument =
+          use_jacoco_coverage && _chromium_code && _java_files != [] &&
+          _build_device_jar && (!defined(invoker.testonly) || !invoker.testonly)
+      if (defined(invoker.jacoco_never_instrument)) {
+        _jacoco_instrument =
+            !invoker.jacoco_never_instrument && _jacoco_instrument
+      }
+
+      if (_build_host_jar) {
+        # Jar files can be needed at runtime (by Robolectric tests or java binaries),
+        # so do not put them under obj/.
+        # TODO(agrieve): I suspect it would be better to use dist_jar for java_binary
+        #     rather than archiving unnecessary .jar files within lib.java.
+        _target_dir_name = get_label_info(":$_main_target_name", "dir")
+        _host_processed_jar_path =
+            "$root_out_dir/lib.java$_target_dir_name/$_output_name.jar"
+      }
+      if (_build_device_jar) {
+        _dex_path = "$target_out_dir/$_main_target_name.dex.jar"
+        _enable_desugar =
+            !defined(invoker.enable_desugar) || invoker.enable_desugar
+        _use_classic_desugar =
+            defined(invoker.use_classic_desugar) && invoker.use_classic_desugar
+
+        # Build speed optimization: Skip "process device" step if the step
+        # would be just a copy and avoid the copy.
+        _process_device_jar =
+            defined(invoker.bytecode_rewriter_target) || _jacoco_instrument ||
+            (_enable_desugar && _use_classic_desugar) ||
+            defined(invoker.jar_excluded_patterns) ||
+            defined(invoker.jar_included_patterns)
+        if (!_process_device_jar && _is_prebuilt) {
+          _device_processed_jar_path = invoker.jar_path
+        } else {
+          _device_processed_jar_path =
+              "$target_out_dir/$_output_name.processed.jar"
+        }
+      }
+
+      # For static libraries, the javac jar output is created at the intermediate
+      # path so that it can be processed by another target and moved to the final
+      # spot that the .build_config.json knows about. Technically this should be done
+      # for the ijar as well, but this is only used for APK targets where
+      # the ijar path isn't actually used.
+      if (_has_sources) {
+        _final_ijar_path = "$target_out_dir/$_output_name.turbine.jar"
+      } else {
+        _final_ijar_path = "$target_out_dir/$_output_name.ijar.jar"
+      }
+
+      if (_has_sources) {
+        if (_build_device_jar && !_process_device_jar) {
+          _javac_jar_path = _device_processed_jar_path
+        } else {
+          _javac_jar_path = "$target_out_dir/$_main_target_name.javac.jar"
+        }
+        _generated_jar_path =
+            "$target_gen_dir/$_main_target_name.generated.srcjar"
+      }
+
+      if (_is_prebuilt) {
+        _unprocessed_jar_path = invoker.jar_path
+      } else {
+        _unprocessed_jar_path = _javac_jar_path
+      }
+    }
+
+    if (_is_prebuilt || _has_sources) {
+      _java_res_deps = []
+      _java_header_deps = []
+      _java_impl_deps = []
+      _non_java_deps = []
+      foreach(_dep, _invoker_deps) {
+        _target_label = get_label_info(_dep, "label_no_toolchain")
+        if (filter_exclude([ _target_label ], _java_resource_patterns) == []) {
+          _java_res_deps += [ _dep ]
+        } else if (filter_exclude([ _target_label ], _java_library_patterns) ==
+                   []) {
+          # This is a java library dep, so it has header and impl targets.
+          _java_header_deps += [ "${_target_label}__header" ]
+          _java_impl_deps += [ "${_target_label}__impl" ]
+        } else {
+          _non_java_deps += [ _dep ]
+        }
+      }
+
+      # Don't need to depend on the apk-under-test to be packaged.
+      if (defined(invoker.apk_under_test)) {
+        _java_header_deps += [ "${invoker.apk_under_test}__java__header" ]
+        _java_impl_deps += [ "${invoker.apk_under_test}__java__impl" ]
+      }
+
+      # These deps cannot be passed via invoker.deps since bundle_module targets
+      # have bundle_module.build_config without the __java suffix, so they are
+      # special and cannot be passed as regular deps to write_build_config.
+      if (defined(invoker.base_module_target)) {
+        _java_header_deps += [ "${invoker.base_module_target}__java__header" ]
+        _java_impl_deps += [ "${invoker.base_module_target}__java__impl" ]
+      }
+
+      _extra_java_deps = []
+      if (_jacoco_instrument) {
+        _extra_java_deps += [ "//third_party/jacoco:jacocoagent_java" ]
+      }
+
+      _include_android_sdk = _build_device_jar
+      if (defined(invoker.include_android_sdk)) {
+        _include_android_sdk = invoker.include_android_sdk
+      }
+      if (_include_android_sdk) {
+        _sdk_java_dep = "//third_party/android_sdk:android_sdk_java"
+        if (defined(invoker.alternative_android_sdk_dep)) {
+          _sdk_java_dep = invoker.alternative_android_sdk_dep
+        }
+
+        # This is an android_system_java_prebuilt target, so no headers.
+        _extra_java_deps += [ _sdk_java_dep ]
+      }
+
+      # Classpath deps is used for header and dex targets, they do not need
+      # resource deps.
+      _classpath_deps = _java_header_deps + _non_java_deps + _extra_java_deps +
+                        [ ":$_build_config_target_name" ]
+
+      _full_classpath_deps =
+          _java_impl_deps + _java_res_deps + _non_java_deps + _extra_java_deps +
+          [ ":$_build_config_target_name" ]
+    }
+
+    # Often needed, but too hard to figure out when ahead of time.
+    not_needed([
+                 "_classpath_deps",
+                 "_full_classpath_deps",
+               ])
+
+    if (_java_files != []) {
+      _java_sources_file = "$target_gen_dir/$_main_target_name.sources"
+      if (defined(invoker.java_sources_file)) {
+        _java_sources_file = invoker.java_sources_file
+      }
+      write_file(_java_sources_file, rebase_path(_java_files, root_build_dir))
+    }
+
+    write_build_config(_build_config_target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "aar_path",
+                               "annotation_processor_deps",
+                               "base_allowlist_rtxt_path",
+                               "gradle_treat_as_prebuilt",
+                               "input_jars_paths",
+                               "low_classpath_priority",
+                               "main_class",
+                               "proguard_configs",
+                               "proguard_enabled",
+                               "proguard_mapping_path",
+                               "public_target_label",
+                               "r_text_path",
+                               "type",
+                             ])
+      if (type == "android_apk" || type == "android_app_bundle_module") {
+        forward_variables_from(
+            invoker,
+            [
+              "android_manifest",
+              "android_manifest_dep",
+              "merged_android_manifest",
+              "final_dex_path",
+              "loadable_modules",
+              "native_lib_placeholders",
+              "res_size_info_path",
+              "secondary_abi_loadable_modules",
+              "secondary_abi_shared_libraries_runtime_deps_file",
+              "secondary_native_lib_placeholders",
+              "shared_libraries_runtime_deps_file",
+              "static_library_dependent_targets",
+              "uncompress_shared_libraries",
+              "library_always_compress",
+              "library_renames",
+            ])
+      }
+      if (type == "android_apk") {
+        forward_variables_from(invoker,
+                               [
+                                 "apk_path",
+                                 "apk_under_test",
+                                 "incremental_apk_path",
+                                 "incremental_install_json_path",
+                               ])
+      }
+      if (type == "android_app_bundle_module") {
+        forward_variables_from(invoker,
+                               [
+                                 "base_module_target",
+                                 "is_base_module",
+                                 "module_pathmap_path",
+                                 "proto_resources_path",
+                                 "version_name",
+                                 "version_code",
+                               ])
+      }
+      chromium_code = _chromium_code
+      build_config = _build_config
+      is_prebuilt = _is_prebuilt
+
+      # Specifically avoid passing in invoker.base_module_target as one of the
+      # possible_config_deps.
+      possible_config_deps = _invoker_deps
+      if (defined(_extra_java_deps)) {
+        possible_config_deps += _extra_java_deps
+      }
+      if (defined(apk_under_test)) {
+        possible_config_deps += [ apk_under_test ]
+      }
+
+      if (defined(invoker.public_deps)) {
+        possible_config_public_deps = invoker.public_deps
+      }
+
+      supports_android = _supports_android
+      requires_android = _requires_android
+      bypass_platform_checks = defined(invoker.bypass_platform_checks) &&
+                               invoker.bypass_platform_checks
+
+      if (defined(_resources_package)) {
+        custom_package = _resources_package
+      }
+      if (_is_prebuilt || _has_sources) {
+        ijar_path = _final_ijar_path
+        unprocessed_jar_path = _unprocessed_jar_path
+      }
+      if (_build_host_jar) {
+        host_jar_path = _host_processed_jar_path
+      }
+      if (_build_device_jar) {
+        device_jar_path = _device_processed_jar_path
+        dex_path = _dex_path
+      }
+      if (_java_files != []) {
+        java_sources_file = _java_sources_file
+      }
+
+      bundled_srcjars = []
+      foreach(d, _srcjar_deps) {
+        _dep_gen_dir = get_label_info(d, "target_gen_dir")
+        _dep_name = get_label_info(d, "name")
+        bundled_srcjars += [ "$_dep_gen_dir/$_dep_name.srcjar" ]
+      }
+      if (defined(invoker.include_java_resources) &&
+          invoker.include_java_resources) {
+        java_resources_jar = _unprocessed_jar_path
+        if (defined(invoker.jar_path)) {
+          # Use original jar_path because _jar_path points to a library without
+          # resources.
+        } else {
+          java_resources_jar = _device_processed_jar_path
+        }
+      }
+    }
+
+    if (_is_prebuilt || _has_sources) {
+      _header_target_name = "${target_name}__header"
+    }
+
+    _public_deps = []
+    _analysis_public_deps = []
+    _analysis_files = []
+
+    if (defined(invoker.proguard_configs)) {
+      assert(_build_host_jar || _build_device_jar)
+
+      # proguard_configs listed on java_library targets need to be marked
+      # as inputs to at least one action so that "gn analyze" will know
+      # about them. Although this target doesn't use them, it's a convenient spot
+      # to list them.
+      # https://crbug.com/827197
+      _analysis_files = invoker.proguard_configs
+      _analysis_public_deps =
+          _non_java_deps + _srcjar_deps  # For the aapt-generated
+                                         # proguard rules.
+    }
+
+    if (_has_sources) {
+      if (defined(invoker.enable_errorprone)) {
+        _enable_errorprone = invoker.enable_errorprone
+      } else {
+        _enable_errorprone =
+            _java_files != [] && _chromium_code && use_errorprone_java_compiler
+      }
+
+      _type = invoker.type
+
+      _uses_fake_rjava = _type == "java_library" && _requires_android
+
+      if (_uses_fake_rjava && defined(_resources_package)) {
+        # has _resources at the end so it looks like a resources pattern, since
+        # it does act like one (and other resources patterns need to depend on
+        # this before they can read its output R.txt).
+        _fake_rjava_target = "${target_name}__rjava_resources"
+        _possible_resource_deps = _invoker_deps
+        generate_r_java(_fake_rjava_target) {
+          deps = [ ":$_build_config_target_name" ]
+          if (defined(_possible_resource_deps)) {
+            possible_resource_deps = _possible_resource_deps
+          }
+          build_config = _build_config
+
+          # Filepath has to be exactly this because compile_java looks for the
+          # srcjar of srcjar_deps at this location $gen_dir/$target_name.srcjar
+          srcjar_path = "$target_gen_dir/$target_name.srcjar"
+          package = _resources_package
+        }
+        _srcjar_deps += [ ":$_fake_rjava_target" ]
+      }
+
+      template("compile_java_helper") {
+        _enable_errorprone =
+            defined(invoker.enable_errorprone) && invoker.enable_errorprone
+        if (_enable_errorprone) {
+          # Rely on the header jar to provide all .class files so that it is
+          # safe to omit generated files entirely for errorprone.
+          _filtered_java_files =
+              filter_exclude(_java_files, [ "$root_gen_dir*" ])
+        }
+        if (_enable_errorprone && _filtered_java_files == []) {
+          # Filtering out generated files resulted in no files left.
+          group(target_name) {
+            not_needed(invoker, "*")
+          }
+        } else {
+          compile_java(target_name) {
+            forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+            output_jar_path = invoker.output_jar_path
+            enable_errorprone = _enable_errorprone
+            use_turbine = defined(invoker.use_turbine) && invoker.use_turbine
+
+            main_target_name = _main_target_name
+            build_config = _build_config
+
+            if (_enable_errorprone) {
+              java_files = _filtered_java_files
+            } else {
+              java_files = _java_files
+              srcjar_deps = _srcjar_deps
+            }
+
+            if (java_files != []) {
+              java_sources_file = _java_sources_file
+            }
+            chromium_code = _chromium_code
+            supports_android = _supports_android
+            requires_android = _requires_android
+            if (!defined(deps)) {
+              deps = []
+            }
+            deps += _classpath_deps
+          }
+        }
+      }
+      _compile_java_forward_variables = [
+        "additional_jar_files",
+        "apk_name",
+        "jar_excluded_patterns",
+        "javac_args",
+        "processor_args_javac",
+        "skip_build_server",
+      ]
+      _annotation_processor_deps = []
+      if (defined(invoker.annotation_processor_deps)) {
+        _annotation_processor_deps = invoker.annotation_processor_deps
+      }
+
+      compile_java_helper(_header_target_name) {
+        forward_variables_from(invoker, _compile_java_forward_variables)
+        use_turbine = true
+        output_jar_path = _final_ijar_path
+        generated_jar_path = _generated_jar_path
+        deps = _annotation_processor_deps
+      }
+      _public_deps += [ ":$_header_target_name" ]
+
+      _compile_java_target = "${_main_target_name}__compile_java"
+      compile_java_helper(_compile_java_target) {
+        forward_variables_from(invoker, _compile_java_forward_variables)
+        output_jar_path = _javac_jar_path
+        deps = [ ":$_header_target_name" ]
+        header_jar_path = _final_ijar_path
+        generated_jar_path = _generated_jar_path
+      }
+      if (_enable_errorprone) {
+        _compile_java_errorprone_target = "${_main_target_name}__errorprone"
+        compile_java_helper(_compile_java_errorprone_target) {
+          forward_variables_from(invoker, _compile_java_forward_variables)
+          enable_errorprone = true
+          if (defined(invoker.errorprone_args)) {
+            if (!defined(javac_args)) {
+              javac_args = []
+            }
+            javac_args += invoker.errorprone_args
+          }
+          deps = [ ":$_header_target_name" ]
+          header_jar_path = _final_ijar_path
+          generated_jar_path = _generated_jar_path
+          output_jar_path = "$target_out_dir/$target_name.errorprone.stamp"
+        }
+        _analysis_public_deps += [ ":$_compile_java_errorprone_target" ]
+      }
+    }  # _has_sources
+
+    if (_is_prebuilt || _build_device_jar || _build_host_jar) {
+      _unprocessed_jar_deps = []
+      if (_has_sources) {
+        _unprocessed_jar_deps += [ ":$_compile_java_target" ]
+      }
+    }
+
+    if (defined(invoker.bytecode_rewriter_target)) {
+      assert(_build_host_jar || _build_device_jar,
+             "A host or device jar must be created to use bytecode rewriting")
+
+      _rewritten_jar = "$target_out_dir/${target_name}_rewritten.jar"
+      _rewritten_jar_target_name = "${target_name}__rewritten"
+      _rewriter_path = root_build_dir + "/bin/helper/" +
+                       get_label_info(invoker.bytecode_rewriter_target, "name")
+      _rebased_build_config = rebase_path(_build_config, root_build_dir)
+      action_with_pydeps(_rewritten_jar_target_name) {
+        script = "//build/android/gyp/bytecode_rewriter.py"
+        inputs = [
+          _rewriter_path,
+          _build_config,
+          _unprocessed_jar_path,
+        ]
+        outputs = [ _rewritten_jar ]
+        depfile = "$target_gen_dir/$target_name.d"
+        args = [
+          "--depfile",
+          rebase_path(depfile, root_build_dir),
+          "--script",
+          rebase_path(_rewriter_path, root_build_dir),
+          "--classpath",
+          "@FileArg($_rebased_build_config:deps_info:javac_full_classpath)",
+          "--classpath",
+          "@FileArg($_rebased_build_config:android:sdk_jars)",
+          "--input-jar",
+          rebase_path(_unprocessed_jar_path, root_build_dir),
+          "--output-jar",
+          rebase_path(_rewritten_jar, root_build_dir),
+        ]
+        deps = _unprocessed_jar_deps + _full_classpath_deps +
+               [ invoker.bytecode_rewriter_target ]
+      }
+
+      _unprocessed_jar_deps = []
+      _unprocessed_jar_deps = [ ":$_rewritten_jar_target_name" ]
+      _unprocessed_jar_path = _rewritten_jar
+    }
+
+    if (_is_prebuilt) {
+      generate_interface_jar(_header_target_name) {
+        # Always used the unfiltered .jar to create the interface jar so that
+        # other targets will resolve filtered classes when depending on
+        # BuildConfig, NativeLibraries, etc.
+        input_jar = _unprocessed_jar_path
+        output_jar = _final_ijar_path
+
+        # Normally ijar does not require any deps, but:
+        # 1 - Some jars are bytecode rewritten by _unprocessed_jar_deps.
+        # 2 - Other jars need to be unzipped by _non_java_deps.
+        # 3 - It is expected that depending on a header target implies depending
+        #     on its transitive header target deps via _java_header_deps.
+        deps = _unprocessed_jar_deps + _non_java_deps + _java_header_deps
+      }
+      _public_deps += [ ":$_header_target_name" ]
+    }
+
+    if (_build_host_jar || _build_device_jar) {
+      _enable_bytecode_checks = !defined(invoker.enable_bytecode_checks) ||
+                                invoker.enable_bytecode_checks
+      if (_enable_bytecode_checks) {
+        _bytecode_checks_target = "${target_name}__validate_classpath"
+        bytecode_processor(_bytecode_checks_target) {
+          forward_variables_from(invoker, [ "missing_classes_allowlist" ])
+          deps = _unprocessed_jar_deps + _full_classpath_deps +
+                 [ ":$_build_config_target_name" ]
+          requires_android = _requires_android
+          target_label =
+              get_label_info(":${invoker.target_name}", "label_no_toolchain")
+          input_jar = _unprocessed_jar_path
+          build_config = _build_config
+          is_prebuilt = _is_prebuilt
+        }
+        _analysis_public_deps += [ ":$_bytecode_checks_target" ]
+      }
+
+      if (_build_host_jar) {
+        _process_host_jar_target_name = "${target_name}__process_host"
+        process_java_library(_process_host_jar_target_name) {
+          forward_variables_from(invoker,
+                                 [
+                                   "jar_excluded_patterns",
+                                   "jar_included_patterns",
+                                 ])
+          input_jar_path = _unprocessed_jar_path
+          jar_deps = _unprocessed_jar_deps + _full_classpath_deps
+          is_device_jar = false
+          output_jar_path = _host_processed_jar_path
+          jacoco_instrument = _jacoco_instrument
+          if (_jacoco_instrument) {
+            java_files = _java_files
+            java_sources_file = _java_sources_file
+          }
+        }
+        _public_deps += [ ":${_process_host_jar_target_name}" ]
+      }
+
+      if (_build_device_jar) {
+        if (_process_device_jar) {
+          _process_device_jar_target_name = "${target_name}__process_device"
+          process_java_library(_process_device_jar_target_name) {
+            forward_variables_from(invoker,
+                                   [
+                                     "jar_excluded_patterns",
+                                     "jar_included_patterns",
+                                   ])
+            input_jar_path = _unprocessed_jar_path
+            jar_deps = _unprocessed_jar_deps + _full_classpath_deps
+            is_device_jar = true
+            output_jar_path = _device_processed_jar_path
+            jacoco_instrument = _jacoco_instrument
+            if (_jacoco_instrument) {
+              java_files = _java_files
+              java_sources_file = _java_sources_file
+            }
+            enable_desugar = _enable_desugar && _use_classic_desugar
+            if (enable_desugar) {
+              build_config = _build_config
+              classpath_deps = _classpath_deps
+              forward_variables_from(invoker, [ "desugar_jars_paths" ])
+            }
+          }
+          _process_device_jar_deps = [ ":${_process_device_jar_target_name}" ]
+          _public_deps += _process_device_jar_deps
+        } else {
+          assert(_unprocessed_jar_path == _device_processed_jar_path)
+          _process_device_jar_deps =
+              _unprocessed_jar_deps + _full_classpath_deps
+        }
+
+        dex("${target_name}__dex") {
+          forward_variables_from(invoker,
+                                 [
+                                   "desugar_jars_paths",
+                                   "proguard_enable_obfuscation",
+                                   "use_classic_desugar",
+                                 ])
+          input_class_jars = [ _device_processed_jar_path ]
+          enable_desugar = _enable_desugar
+          ignore_desugar_missing_deps = !_enable_bytecode_checks
+
+          # There's no value in per-class dexing prebuilts since they never
+          # change just one class at a time.
+          disable_incremental = _is_prebuilt
+          output = _dex_path
+          deps = _process_device_jar_deps
+
+          if (enable_desugar && !_use_classic_desugar) {
+            # Desugaring with D8 requires full classpath.
+            build_config = _build_config
+            final_ijar_path = _final_ijar_path
+            deps += _classpath_deps + [ ":$_header_target_name" ]
+          }
+
+          enable_multidex = false
+          is_library = true
+        }
+        _public_deps += [ ":${target_name}__dex" ]
+      }
+    }
+
+    if (_is_java_binary) {
+      # Targets might use the generated script while building, so make it a dep
+      # rather than a data_dep.
+      java_binary_script("${target_name}__java_binary_script") {
+        forward_variables_from(invoker,
+                               [
+                                 "tiered_stop_at_level_one",
+                                 "main_class",
+                                 "wrapper_script_args",
+                               ])
+        build_config = _build_config
+        script_name = _main_target_name
+        if (defined(invoker.wrapper_script_name)) {
+          script_name = invoker.wrapper_script_name
+        }
+        deps = [ ":$_build_config_target_name" ]
+      }
+      _public_deps += [ ":${target_name}__java_binary_script" ]
+    }
+
+    # The __impl target contains all non-analysis steps for this template.
+    # Having this separated out from the main target (which contains analysis
+    # steps) allows analysis steps for this target to be run concurrently with
+    # the non-analysis steps of other targets that depend on this one.
+    group("${target_name}__impl") {
+      public_deps = _public_deps
+    }
+
+    java_lib_group("${target_name}__assetres") {
+      deps = _invoker_deps
+      group_name = "assetres"
+
+      if (defined(_fake_rjava_target)) {
+        deps += [ ":$_fake_rjava_target" ]
+      }
+    }
+
+    group(target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "assert_no_deps",
+                               "data",
+                               "data_deps",
+                               "deps",
+                               "public_deps",
+                               "visibility",
+                             ])
+      if (!defined(public_deps)) {
+        public_deps = []
+      }
+      public_deps += [ ":${target_name}__impl" ]
+      if (!defined(data)) {
+        data = []
+      }
+      data += _analysis_files
+      if (!defined(data_deps)) {
+        data_deps = []
+      }
+      data_deps += _analysis_public_deps
+    }
+  }
+}
+
+# Create a zip archive corresponding to an application bundle module.
+#
+# Compile all the components of a given android_apk_or_module() target into a
+# zip archive suitable to later create an android_app_bundle() target. This
+# archive's format is very similar to that on an APK, except for a few
+# differences in internal directory layouts, and the fact that resources, as
+# well as xml files, are compiled using a protocol-buffer based format (instead
+# of the regular binary xml + resources.arsc).
+#
+# A final application bundle is built from one or more module bundle modules,
+# plus some configuration file.
+#
+# Variables:
+#   module_zip_path: Output module path.
+#   build_config: Path to build_config of the android_apk_or_module() target.
+#   dex_path: If module is proguarded separately from the base module, dex_path
+#     is the path to its dex file and is passed directly to the creation script.
+#     Otherwise, dex_path is undefined and we retrieve the module's dex file
+#     using its build_config.
+#   expected_libs_and_assets: Verify the list of included native libraries
+#     and assets is consistent with the given expectation file.
+#   expected_libs_and_assets_base: Treat expected_libs_and_assets as a diff
+#     with this file as the base.
+#   is_multi_abi: If true will add a library placeholder for the missing ABI if
+#     either the primary or the secondary ABI has no native libraries set.
+#   module_name: The module's name.
+#   native_libraries_config: Path to file listing native libraries to be
+#     packaged into each module.
+#   proguard_enabled: Optional. True if proguarding is enabled for this
+#     bundle. Default is to enable this only for release builds. Note that
+#     this will always perform synchronized proguarding.
+template("create_android_app_bundle_module") {
+  _rebased_build_config = rebase_path(invoker.build_config, root_build_dir)
+  _rebased_native_libraries_config =
+      rebase_path(invoker.native_libraries_config, root_build_dir)
+  _proguard_enabled =
+      defined(invoker.proguard_enabled) && invoker.proguard_enabled
+
+  forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+  _deps = invoker.deps
+  _script = "//build/android/gyp/apkbuilder.py"
+
+  # NOTE: Compared to the inputs of the "package_apk" template action,
+  #       this list is much smaller, since finalize_apk is never called
+  #       by apkbuild.py --format=bundle-module. This means not using
+  #       apksigner and zipalign as well, nor the keystore. Other
+  #       dependencies like extra native libraries are all pulled from the
+  #       .build_config.json through @FileArg() references (see below) and
+  #       will be listed in the generated depfile instead.
+  _inputs = [
+    invoker.build_config,
+    invoker.native_libraries_config,
+  ]
+  _outputs = [ invoker.module_zip_path ]
+  _args = [
+    "--format=bundle-module",
+    "--output-apk",
+    rebase_path(invoker.module_zip_path, root_build_dir),
+    "--resource-apk=@FileArg(" +
+        "$_rebased_build_config:deps_info:proto_resources_path)",
+    "--assets=@FileArg($_rebased_build_config:assets)",
+    "--uncompressed-assets=@FileArg(" +
+        "$_rebased_build_config:uncompressed_assets)",
+    "--native-libs=@FileArg($_rebased_native_libraries_config" +
+        ":${invoker.module_name})",
+    "--native-lib-placeholders=@FileArg($_rebased_build_config" +
+        ":native:native_library_placeholders)",
+    "--secondary-native-lib-placeholders=@FileArg($_rebased_build_config" +
+        ":native:secondary_native_library_placeholders)",
+    "--android-abi=$android_app_abi",
+    "--min-sdk-version=${invoker.min_sdk_version}",
+    "--uncompress-shared-libraries=@FileArg(" +
+        "$_rebased_build_config:native:uncompress_shared_libraries)",
+    "--library-always-compress=@FileArg($_rebased_build_config:native:library_always_compress)",
+    "--library-renames=@FileArg($_rebased_build_config:native:library_renames)",
+  ]
+  if (defined(android_app_secondary_abi)) {
+    _rebased_secondary_abi_native_libraries_config =
+        rebase_path(invoker.secondary_abi_native_libraries_config,
+                    root_build_dir)
+    _args += [
+      "--secondary-native-libs",
+      "@FileArg($_rebased_secondary_abi_native_libraries_config" +
+          ":${invoker.module_name})",
+      "--secondary-android-abi=$android_app_secondary_abi",
+    ]
+  }
+  if (defined(invoker.is_multi_abi) && invoker.is_multi_abi) {
+    _args += [ "--is-multi-abi" ]
+  }
+  if (defined(invoker.uncompress_dex) && invoker.uncompress_dex) {
+    _args += [ "--uncompress-dex" ]
+  }
+
+  # Use either provided dex path or build config path based on type of module.
+  if (defined(invoker.dex_path)) {
+    _inputs += [ invoker.dex_path ]
+    _rebased_dex_path = rebase_path(invoker.dex_path, root_build_dir)
+    _args += [ "--dex-file=$_rebased_dex_path" ]
+  } else {
+    _args += [ "--dex-file=@FileArg($_rebased_build_config:final_dex:path)" ]
+  }
+
+  # The library is imported via proguard when proguard is enabled.
+  if (!_proguard_enabled && enable_jdk_library_desugaring &&
+      invoker.module_name == "base") {
+    _all_jdk_libs = "//build/android:all_jdk_libs"
+    _deps += [ _all_jdk_libs ]
+    _jdk_libs_dex =
+        get_label_info(_all_jdk_libs, "target_out_dir") + "/all_jdk_libs.l8.dex"
+    _inputs += [ _jdk_libs_dex ]
+    _args += [
+      "--jdk-libs-dex-file",
+      rebase_path(_jdk_libs_dex, root_build_dir),
+    ]
+  }
+
+  if (treat_warnings_as_errors) {
+    _args += [ "--warnings-as-errors" ]
+  }
+
+  if (defined(invoker.expected_libs_and_assets)) {
+    _expectations_target = "${invoker.top_target_name}_validate_libs_and_assets"
+    action_with_pydeps(_expectations_target) {
+      _actual_file = "$target_gen_dir/$target_name.libs_and_assets"
+      _failure_file = "$expectations_failure_dir/" +
+                      string_replace(invoker.expected_libs_and_assets, "/", "_")
+      inputs = [
+        invoker.expected_libs_and_assets,
+        invoker.build_config,
+        invoker.native_libraries_config,
+      ]
+      deps = [
+        invoker.build_config_target,
+        invoker.native_libraries_config_target,
+      ]
+      if (defined(android_app_secondary_abi)) {
+        inputs += [ invoker.secondary_abi_native_libraries_config ]
+        deps += [ invoker.secondary_abi_native_libraries_config_target ]
+      }
+      outputs = [
+        _actual_file,
+        _failure_file,
+      ]
+      script = _script
+      args = _args + [
+               "--expected-file",
+               rebase_path(invoker.expected_libs_and_assets, root_build_dir),
+               "--actual-file",
+               rebase_path(_actual_file, root_build_dir),
+               "--failure-file",
+               rebase_path(_failure_file, root_build_dir),
+               "--only-verify-expectations",
+             ]
+      if (defined(invoker.expected_libs_and_assets_base)) {
+        inputs += [ invoker.expected_libs_and_assets_base ]
+        args += [
+          "--expected-file-base",
+          rebase_path(invoker.expected_libs_and_assets_base, root_build_dir),
+        ]
+      }
+      if (fail_on_android_expectations) {
+        args += [ "--fail-on-expectations" ]
+      }
+    }
+    _deps += [ ":$_expectations_target" ]
+  }
+
+  action_with_pydeps(target_name) {
+    deps = _deps
+    inputs = _inputs
+    outputs = _outputs
+    script = _script
+    depfile = "$target_gen_dir/$target_name.d"
+    args = _args + [
+             "--depfile",
+             rebase_path(depfile, root_build_dir),
+           ]
+  }
+}
+
+# Splits input dex file(s) based on given feature jars into seperate dex files
+# for each feature.
+#
+# Variables:
+#   proguard_mapping: Path to input proguard mapping produced by synchronized
+#     proguarding.
+#   input_dex_zip: Path to zipped dex files to split.
+#   all_modules: Path to list of all modules. Each Module must have
+#     build_config, name, and build_config_target properties.
+#   feature_jars_args: Optional list of args to be passed to dexsplitter.py.
+#     If used should include the jars owned by each feature (in the same order
+#     as all_modules). Allows invoker to pull the list of jars from a different
+#     .build_config.json than the module's .build_config.
+template("dexsplitter") {
+  action_with_pydeps(target_name) {
+    forward_variables_from(invoker, [ "deps" ])
+    script = "//build/android/gyp/dexsplitter.py"
+    _stamp = "${target_gen_dir}/${target_name}.stamp"
+    outputs = [ _stamp ]
+
+    depfile = "${target_gen_dir}/${target_name}.d"
+    args = [
+      "--stamp",
+      rebase_path(_stamp, root_build_dir),
+      "--depfile",
+      rebase_path(depfile, root_build_dir),
+      "--r8-path",
+      rebase_path(_r8_path, root_build_dir),
+      "--input-dex-zip",
+      rebase_path(invoker.input_dex_zip, root_build_dir),
+      "--proguard-mapping-file",
+      rebase_path(invoker.proguard_mapping, root_build_dir),
+    ]
+
+    foreach(_feature_module, invoker.all_modules) {
+      _rebased_module_build_config =
+          rebase_path(_feature_module.build_config, root_build_dir)
+      args += [
+        "--feature-name",
+        _feature_module.name,
+        "--dex-dest=@FileArg($_rebased_module_build_config:final_dex:path)",
+      ]
+      if (!defined(invoker.feature_jars_args)) {
+        args += [ "--feature-jars=@FileArg($_rebased_module_build_config:deps_info:device_classpath)" ]
+      }
+      deps += [ _feature_module.build_config_target ]
+    }
+    if (defined(invoker.feature_jars_args)) {
+      args += invoker.feature_jars_args
+    }
+  }
+}
+
+# Allots native libraries depended on by feature modules to the module the
+# libraries should be packaged into. The packaging module may be different from
+# the dependee module in case a library is depended on by multiple modules. In
+# that case the library will be allotted to the closest ancestor given a module
+# dependency tree (see |parent| below).
+#
+# Variables:
+#   modules: List of scopes with the following format:
+#     name: The module's name.
+#     parent: The module's parent's name.
+#     build_config: Path to the module's build config.
+#     build_config_target: Target creating |build_config|.
+#   native_libraries_filearg_keys: Keys to be used in
+#     @FileArg(|build_config|:<keys>) expressions pointing to a list of native
+#     libraries to consider in |build_config|.
+#   output: Path to native libraries config.
+template("allot_native_libraries") {
+  action_with_pydeps(target_name) {
+    script = "//build/android/gyp/allot_native_libraries.py"
+    args = [
+      "--output",
+      rebase_path(invoker.output, root_build_dir),
+    ]
+    outputs = [ invoker.output ]
+    deps = []
+    if (defined(invoker.deps)) {
+      deps += invoker.deps
+    }
+    inputs = []
+    foreach(_module, invoker.modules) {
+      deps += [ _module.build_config_target ]
+      inputs += [ _module.build_config ]
+      _rebased_build_config = rebase_path(_module.build_config, root_out_dir)
+      foreach(_key, invoker.native_libraries_filearg_keys) {
+        args += [
+          "--libraries",
+          "${_module.name},@FileArg($_rebased_build_config:$_key)",
+        ]
+      }
+      if (defined(_module.parent)) {
+        args += [
+          "--dep",
+          "${_module.parent}:${_module.name}",
+        ]
+      }
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/android/linker_version_script.gni b/third_party/libwebrtc/build/config/android/linker_version_script.gni
new file mode 100644
index 0000000000..96d8b665d1
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/linker_version_script.gni
@@ -0,0 +1,43 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/python.gni")
+
+# Generate a custom linker version script that can later be used with
+# "-Wl,--version-script=<path>" ldflags.
+#
+# Variables:
+#    export_java_symbols: Optional. If true, also export all Java_* symbols
+#      exported for JNI.
+#    export_symbol_allowlist_files: Optional. List of paths to input files containing
+#      lists of symbols to export.
+#    linker_script: Path to output linker version script.
+#
+template("generate_linker_version_script") {
+  action_with_pydeps(target_name) {
+    script = "//build/android/gyp/generate_linker_version_script.py"
+    outputs = [ invoker.linker_script ]
+    inputs = []
+    args = [ "--output=" + rebase_path(invoker.linker_script, root_build_dir) ]
+
+    if (defined(invoker.export_java_symbols) && invoker.export_java_symbols) {
+      args += [ "--export-java-symbols" ]
+    }
+
+    if (defined(invoker.export_feature_registrations) &&
+        invoker.export_feature_registrations) {
+      args += [ "--export-feature-registrations" ]
+    }
+
+    if (defined(invoker.export_symbol_allowlist_files)) {
+      foreach(file_, invoker.export_symbol_allowlist_files) {
+        inputs += [ file_ ]
+        args += [
+          "--export-symbol-allowlist-file",
+          rebase_path(file_, root_build_dir),
+        ]
+      }
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/android/rules.gni b/third_party/libwebrtc/build/config/android/rules.gni
new file mode 100644
index 0000000000..45499a3781
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/rules.gni
@@ -0,0 +1,5183 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Do not add any imports to non-//build directories here.
+# Some projects (e.g. V8) do not have non-build directories DEPS'ed in.
+
+import("//build/config/android/channel.gni")
+import("//build/config/android/config.gni")
+import("//build/config/android/internal_rules.gni")
+import("//build/config/clang/clang.gni")
+import("//build/config/compiler/compiler.gni")
+import("//build/config/coverage/coverage.gni")
+import("//build/config/python.gni")
+import("//build/config/rts.gni")
+import("//build/config/zip.gni")
+import("//build/toolchain/toolchain.gni")
+
+assert(is_android)
+
+declare_args() {
+  enable_jni_tracing = false
+}
+
+if (target_cpu == "arm") {
+  _sanitizer_arch = "arm"
+} else if (target_cpu == "arm64") {
+  _sanitizer_arch = "aarch64"
+} else if (target_cpu == "x86") {
+  _sanitizer_arch = "i686"
+}
+
+_sanitizer_runtimes = []
+if (use_cfi_diag || is_ubsan || is_ubsan_security || is_ubsan_vptr) {
+  _sanitizer_runtimes = [ "$clang_base_path/lib/clang/$clang_version/lib/linux/libclang_rt.ubsan_standalone-$_sanitizer_arch-android.so" ]
+}
+
+# Creates a dist directory for a native executable.
+#
+# Running a native executable on a device requires all the shared library
+# dependencies of that executable. To make it easier to install and run such an
+# executable, this will create a directory containing the native exe and all
+# it's library dependencies.
+#
+# Note: It's usually better to package things as an APK than as a native
+# executable.
+#
+# Variables
+#   dist_dir: Directory for the exe and libraries. Everything in this directory
+#     will be deleted before copying in the exe and libraries.
+#   binary: Path to (stripped) executable.
+#   extra_files: List of extra files to copy in (optional).
+#
+# Example
+#   create_native_executable_dist("foo_dist") {
+#     dist_dir = "$root_build_dir/foo_dist"
+#     binary = "$root_build_dir/foo"
+#     deps = [ ":the_thing_that_makes_foo" ]
+#   }
+template("create_native_executable_dist") {
+  forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+  _libraries_list = "${target_gen_dir}/${target_name}_library_dependencies.list"
+
+  _sanitizer_runtimes_target_name = "${target_name}__sanitizer_runtimes"
+  group(_sanitizer_runtimes_target_name) {
+    metadata = {
+      shared_libraries = _sanitizer_runtimes
+    }
+  }
+
+  generated_file("${target_name}__library_list") {
+    forward_variables_from(invoker, [ "deps" ])
+    if (!defined(deps)) {
+      deps = []
+    }
+    deps += [ ":${_sanitizer_runtimes_target_name}" ]
+    output_conversion = "json"
+    outputs = [ _libraries_list ]
+    data_keys = [ "shared_libraries" ]
+    walk_keys = [ "shared_libraries_barrier" ]
+    rebase = root_build_dir
+  }
+
+  copy_ex(target_name) {
+    inputs = [
+      _libraries_list,
+      invoker.binary,
+    ]
+
+    dest = invoker.dist_dir
+    data = [ "${invoker.dist_dir}/" ]
+
+    _rebased_libraries_list = rebase_path(_libraries_list, root_build_dir)
+    _rebased_binaries_list = rebase_path([ invoker.binary ], root_build_dir)
+    args = [
+      "--clear",
+      "--files=@FileArg($_rebased_libraries_list)",
+      "--files=$_rebased_binaries_list",
+    ]
+    if (defined(invoker.extra_files)) {
+      _rebased_extra_files = rebase_path(invoker.extra_files, root_build_dir)
+      args += [ "--files=$_rebased_extra_files" ]
+    }
+
+    _depfile = "$target_gen_dir/$target_name.d"
+    _stamp_file = "$target_gen_dir/$target_name.stamp"
+    outputs = [ _stamp_file ]
+    args += [
+      "--depfile",
+      rebase_path(_depfile, root_build_dir),
+      "--stamp",
+      rebase_path(_stamp_file, root_build_dir),
+    ]
+
+    deps = [ ":${target_name}__library_list" ]
+    if (defined(invoker.deps)) {
+      deps += invoker.deps
+    }
+  }
+}
+
+if (enable_java_templates) {
+  import("//build/config/sanitizers/sanitizers.gni")
+
+  # JNI target implementation. See generate_jni or generate_jar_jni for usage.
+  template("generate_jni_impl") {
+    _jni_output_dir = "${target_gen_dir}/${target_name}"
+    if (defined(invoker.jni_generator_include)) {
+      _jni_generator_include = invoker.jni_generator_include
+      _jni_generator_include_deps = []
+    } else {
+      _jni_generator_include =
+          "//base/android/jni_generator/jni_generator_helper.h"
+      _jni_generator_include_deps = [
+        # Using //base/android/jni_generator/jni_generator_helper.h introduces
+        # a dependency on buildflags targets indirectly through
+        # base/android/jni_android.h, which is part of the //base target.
+        # This can't depend directly on //base without causing a dependency
+        # cycle, though.
+        "//base:debugging_buildflags",
+        "//base:logging_buildflags",
+        "//build:chromeos_buildflags",
+      ]
+    }
+
+    action_with_pydeps(target_name) {
+      # The sources aren't compiled so don't check their dependencies.
+      check_includes = false
+      script = "//base/android/jni_generator/jni_generator.py"
+      forward_variables_from(invoker,
+                             TESTONLY_AND_VISIBILITY + [
+                                   "deps",
+                                   "public_deps",
+                                 ])
+      if (!defined(public_deps)) {
+        public_deps = []
+      }
+      public_deps += _jni_generator_include_deps
+      inputs = []
+      args = [
+        "--ptr_type=long",
+        "--includes",
+        rebase_path(_jni_generator_include, _jni_output_dir),
+      ]
+
+      if (defined(invoker.classes)) {
+        if (defined(invoker.jar_file)) {
+          _jar_file = invoker.jar_file
+        } else {
+          _jar_file = android_sdk_jar
+        }
+        inputs += [ _jar_file ]
+        args += [
+          "--jar_file",
+          rebase_path(_jar_file, root_build_dir),
+        ]
+        _input_args = invoker.classes
+        _input_names = invoker.classes
+        if (defined(invoker.always_mangle) && invoker.always_mangle) {
+          args += [ "--always_mangle" ]
+        }
+      } else {
+        assert(defined(invoker.sources))
+        inputs += invoker.sources
+        _input_args = rebase_path(invoker.sources, root_build_dir)
+        _input_names = invoker.sources
+        if (use_hashed_jni_names) {
+          args += [ "--use_proxy_hash" ]
+        }
+        if (defined(invoker.namespace)) {
+          args += [ "-n ${invoker.namespace}" ]
+        }
+      }
+      if (defined(invoker.split_name)) {
+        args += [ "--split_name=${invoker.split_name}" ]
+      }
+
+      outputs = []
+      foreach(_name, _input_names) {
+        _name_part = get_path_info(_name, "name")
+        outputs += [ "${_jni_output_dir}/${_name_part}_jni.h" ]
+      }
+
+      # Avoid passing GN lists because not all webrtc embedders use //build.
+      foreach(_output, outputs) {
+        args += [
+          "--output_file",
+          rebase_path(_output, root_build_dir),
+        ]
+      }
+      foreach(_input, _input_args) {
+        args += [ "--input_file=$_input" ]
+      }
+
+      if (enable_profiling) {
+        args += [ "--enable_profiling" ]
+      }
+      if (enable_jni_tracing) {
+        args += [ "--enable_tracing" ]
+      }
+    }
+  }
+
+  # Declare a jni target
+  #
+  # This target generates the native jni bindings for a set of .java files.
+  #
+  # See base/android/jni_generator/jni_generator.py for more info about the
+  # format of generating JNI bindings.
+  #
+  # Variables
+  #   sources: list of .java files to generate jni for
+  #   namespace: Specify the namespace for the generated header file.
+  #   deps, public_deps: As normal
+  #
+  # Example
+  #   # Target located in base/BUILD.gn.
+  #   generate_jni("foo_jni") {
+  #     # Generates gen/base/foo_jni/Foo_jni.h
+  #     # To use: #include "base/foo_jni/Foo_jni.h"
+  #     sources = [
+  #       "android/java/src/org/chromium/foo/Foo.java",
+  #       ...,
+  #     ]
+  #   }
+  template("generate_jni") {
+    generate_jni_impl(target_name) {
+      forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    }
+  }
+
+  # Declare a jni target for a prebuilt jar
+  #
+  # This target generates the native jni bindings for a set of classes in a .jar.
+  #
+  # See base/android/jni_generator/jni_generator.py for more info about the
+  # format of generating JNI bindings.
+  #
+  # Variables
+  #   classes: list of .class files in the jar to generate jni for. These should
+  #     include the full path to the .class file.
+  #   jar_file: the path to the .jar. If not provided, will default to the sdk's
+  #     android.jar
+  #   always_mangle: Mangle all generated method names. By default, the script
+  #     only mangles methods that cause ambiguity due to method overload.
+  #   deps, public_deps: As normal
+  #
+  # Example
+  #   # Target located in base/BUILD.gn.
+  #   generate_jar_jni("foo_jni") {
+  #     # Generates gen/base/foo_jni/Runnable_jni.h
+  #     # To use: #include "base/foo_jni/Runnable_jni.h"
+  #     classes = [
+  #       "android/view/Foo.class",
+  #     ]
+  #   }
+  template("generate_jar_jni") {
+    generate_jni_impl(target_name) {
+      forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    }
+  }
+
+  # Declare a jni registration target.
+  #
+  # This target generates a srcjar containing a copy of GEN_JNI.java, which has
+  # the native methods of all dependent java files. It can also create a .h file
+  # for use with manual JNI registration.
+  #
+  # The script does not scan any generated sources (those within .srcjars, or
+  # within root_build_dir). This could be fixed by adding deps & logic to scan
+  # .srcjars, but isn't currently needed.
+  #
+  # See base/android/jni_generator/jni_registration_generator.py for more info
+  # about the format of the header file.
+  #
+  # Variables
+  #   targets: List of .build_config.json supported targets to provide java sources.
+  #   header_output: Path to the generated .h file (optional).
+  #   sources_exclusions: List of .java files that should be skipped. (optional)
+  #   namespace: Registration functions will be wrapped into this. (optional)
+  #   require_native_mocks: Enforce that any native calls using
+  #     org.chromium.base.annotations.NativeMethods must have a mock set
+  #     (optional).
+  #   enable_native_mocks: Allow native calls using
+  #     org.chromium.base.annotations.NativeMethods to be mocked in tests
+  #     (optional).
+  #   no_transitive_deps: Generate registration for only the Java source in the
+  #     specified target(s). This is useful for generating registration for
+  #     feature modules, without including base module dependencies.
+  #
+  # Example
+  #   generate_jni_registration("chrome_jni_registration") {
+  #     targets = [ ":chrome_public_apk" ]
+  #     header_output = "$target_gen_dir/$target_name.h"
+  #     sources_exclusions = [
+  #       "//path/to/Exception.java",
+  #     ]
+  #   }
+  template("generate_jni_registration") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+      script = "//base/android/jni_generator/jni_registration_generator.py"
+      inputs = []
+      deps = []
+      _srcjar_output = "$target_gen_dir/$target_name.srcjar"
+      outputs = [ _srcjar_output ]
+      depfile = "$target_gen_dir/$target_name.d"
+
+      args = [
+        "--srcjar-path",
+        rebase_path(_srcjar_output, root_build_dir),
+        "--depfile",
+        rebase_path(depfile, root_build_dir),
+      ]
+      foreach(_target, invoker.targets) {
+        deps += [ "${_target}$build_config_target_suffix($default_toolchain)" ]
+        _build_config =
+            get_label_info("${_target}($default_toolchain)", "target_gen_dir") +
+            "/" + get_label_info("${_target}($default_toolchain)", "name") +
+            ".build_config.json"
+        _rebased_build_config = rebase_path(_build_config, root_build_dir)
+        inputs += [ _build_config ]
+
+        if (defined(invoker.no_transitive_deps) && invoker.no_transitive_deps) {
+          args += [ "--sources-files=@FileArg($_rebased_build_config:deps_info:java_sources_file)" ]
+        } else {
+          args += [
+            # This is a list of .sources files.
+            "--sources-files=@FileArg($_rebased_build_config:deps_info:jni:all_source)",
+          ]
+        }
+      }
+
+      if (use_hashed_jni_names) {
+        args += [ "--use_proxy_hash" ]
+      }
+
+      if (defined(invoker.enable_native_mocks) && invoker.enable_native_mocks) {
+        args += [ "--enable_proxy_mocks" ]
+
+        if (defined(invoker.require_native_mocks) &&
+            invoker.require_native_mocks) {
+          args += [ "--require_mocks" ]
+        }
+      }
+
+      if (defined(invoker.header_output)) {
+        outputs += [ invoker.header_output ]
+        args += [
+          "--header-path",
+          rebase_path(invoker.header_output, root_build_dir),
+        ]
+      }
+
+      if (defined(invoker.sources_exclusions)) {
+        _rebase_sources_exclusions =
+            rebase_path(invoker.sources_exclusions, root_build_dir)
+        args += [ "--sources-exclusions=$_rebase_sources_exclusions" ]
+      }
+
+      if (defined(invoker.namespace)) {
+        args += [ "--namespace=${invoker.namespace}" ]
+      }
+    }
+  }
+
+  # Declare a target for c-preprocessor-generated java files
+  #
+  # NOTE: For generating Java conterparts to enums prefer using the java_cpp_enum
+  #       rule instead.
+  #
+  # This target generates java files using the host C pre-processor. Each file in
+  # sources will be compiled using the C pre-processor. If include_path is
+  # specified, it will be passed (with --I) to the pre-processor.
+  #
+  # This target will create a single .srcjar. Adding this target to an
+  # android_library target's srcjar_deps will make the generated java files be
+  # included in that library's final outputs.
+  #
+  # Variables
+  #   sources: list of files to be processed by the C pre-processor. For each
+  #     file in sources, there will be one .java file in the final .srcjar. For a
+  #     file named FooBar.template, a java file will be created with name
+  #     FooBar.java.
+  #   inputs: additional compile-time dependencies. Any files
+  #     `#include`-ed in the templates should be listed here.
+  #   defines: List of -D arguments for the preprocessor.
+  #
+  # Example
+  #   java_cpp_template("foo_generated_enum") {
+  #     sources = [
+  #       "android/java/templates/Foo.template",
+  #     ]
+  #     inputs = [
+  #       "android/java/templates/native_foo_header.h",
+  #     ]
+  #   }
+  template("java_cpp_template") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "data_deps",
+                               "deps",
+                               "inputs",
+                               "public_deps",
+                               "sources",
+                               "testonly",
+                               "visibility",
+                             ])
+      script = "//build/android/gyp/gcc_preprocess.py"
+      outputs = [ "$target_gen_dir/$target_name.srcjar" ]
+
+      _include_dirs = [
+        "//",
+        root_gen_dir,
+      ]
+      _rebased_include_dirs = rebase_path(_include_dirs, root_build_dir)
+      args = [
+        "--include-dirs=$_rebased_include_dirs",
+        "--output",
+        rebase_path(outputs[0], root_build_dir),
+      ]
+      if (defined(invoker.defines)) {
+        foreach(_define, invoker.defines) {
+          args += [
+            "--define",
+            _define,
+          ]
+        }
+      }
+      args += rebase_path(sources, root_build_dir)
+    }
+  }
+
+  # Declare a target for generating Java classes from C++ enums.
+  #
+  # This target generates Java files from C++ enums using a script.
+  #
+  # This target will create a single .srcjar. Adding this target to an
+  # android_library target's srcjar_deps will make the generated java files be
+  # included in that library's final outputs.
+  #
+  # Variables
+  #   sources: list of files to be processed by the script. For each annotated
+  #     enum contained in the sources files the script will generate a .java
+  #     file with the same name as the name of the enum.
+  #
+  # Example
+  #   java_cpp_enum("foo_generated_enum") {
+  #     sources = [
+  #       "src/native_foo_header.h",
+  #     ]
+  #   }
+  template("java_cpp_enum") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "sources" ])
+
+      # The sources aren't compiled so don't check their dependencies.
+      check_includes = false
+      script = "//build/android/gyp/java_cpp_enum.py"
+
+      _srcjar_path = "${target_gen_dir}/${target_name}.srcjar"
+      _rebased_srcjar_path = rebase_path(_srcjar_path, root_build_dir)
+      _rebased_sources = rebase_path(invoker.sources, root_build_dir)
+
+      args = [ "--srcjar=$_rebased_srcjar_path" ] + _rebased_sources
+      outputs = [ _srcjar_path ]
+    }
+  }
+
+  # Declare a target for generating Java classes with string constants matching
+  # those found in C++ files using a python script.
+  #
+  # This target will create a single .srcjar. Adding this target to an
+  # android_library target's srcjar_deps will make the generated java files be
+  # included in that library's final outputs.
+  #
+  # Variables
+  #   sources: list of files to be processed by the script. For each string
+  #            constant in the source files, the script will add a corresponding
+  #            Java string to the specified template file.
+  # Example
+  #   java_cpp_strings("foo_switches") {
+  #     sources = [
+  #       "src/foo_switches.cc",
+  #     ]
+  #     template = "src/templates/FooSwitches.java.tmpl
+  #   }
+  #
+  # foo_switches.cc:
+  #
+  # // A switch.
+  # const char kASwitch = "a-switch";
+  #
+  # FooSwitches.java.tmpl
+  #
+  # // Copyright {YEAR} The Chromium Authors. All rights reserved.
+  # // Use of this source code is governed by a BSD-style license that can be
+  # // found in the LICENSE file.
+  #
+  # // This file is autogenerated by
+  # //     {SCRIPT_NAME}
+  # // From
+  # //     {SOURCE_PATH}, and
+  # //     {TEMPLATE_PATH}
+  #
+  # package my.java.package;
+  #
+  # public abstract class FooSwitches {{
+  #     // ...snip...
+  # {NATIVE_STRINGS}
+  #     // ...snip...
+  # }}
+  #
+  # result:
+  #   A FooSwitches.java file, defining a class named FooSwitches in the package
+  #   my.java.package.
+  template("java_cpp_strings") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "sources" ])
+
+      # The sources aren't compiled so don't check their dependencies.
+      check_includes = false
+      script = "//build/android/gyp/java_cpp_strings.py"
+
+      _srcjar_path = "${target_gen_dir}/${target_name}.srcjar"
+      _rebased_srcjar_path = rebase_path(_srcjar_path, root_build_dir)
+      _rebased_sources = rebase_path(invoker.sources, root_build_dir)
+      _rebased_template = rebase_path(invoker.template, root_build_dir)
+
+      args = [
+        "--srcjar=$_rebased_srcjar_path",
+        "--template=$_rebased_template",
+      ]
+      args += _rebased_sources
+      sources += [ invoker.template ]
+
+      outputs = [ _srcjar_path ]
+    }
+  }
+
+  # Declare a target for generating Java classes with string constants matching
+  # those found in C++ base::Feature declarations, using a python script.
+  #
+  # This target will create a single .srcjar. Adding this target to an
+  # android_library target's srcjar_deps will make the generated java files be
+  # included in that library's final outputs.
+  #
+  # Variables
+  #   sources: list of files to be processed by the script. For each
+  #            base::Feature in the source files, the script will add a
+  #            corresponding Java string for that feature's name to the
+  #            specified template file.
+  # Example
+  #   java_cpp_features("foo_features") {
+  #     sources = [
+  #       "src/foo_features.cc",
+  #     ]
+  #     template = "src/templates/FooFeatures.java.tmpl
+  #   }
+  #
+  # foo_features.cc:
+  #
+  # // A feature.
+  # const base::Feature kSomeFeature{"SomeFeature",
+  #                                  base::FEATURE_DISABLED_BY_DEFAULT};
+  #
+  # FooFeatures.java.tmpl
+  #
+  # // Copyright $YEAR The Chromium Authors. All rights reserved.
+  # // Use of this source code is governed by a BSD-style license that can be
+  # // found in the LICENSE file.
+  #
+  # package my.java.package;
+  #
+  # public final class FooFeatures {{
+  #     // ...snip...
+  # {NATIVE_STRINGS}
+  #     // ...snip...
+  #     // Do not instantiate this class.
+  #     private FooFeatures() {{}}
+  # }}
+  #
+  # result:
+  #   A FooFeatures.java file, defining a class named FooFeatures in the package
+  #   my.java.package.
+  template("java_cpp_features") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "sources" ])
+
+      # The sources aren't compiled so don't check their dependencies.
+      check_includes = false
+      script = "//build/android/gyp/java_cpp_features.py"
+
+      _srcjar_path = "${target_gen_dir}/${target_name}.srcjar"
+      _rebased_srcjar_path = rebase_path(_srcjar_path, root_build_dir)
+      _rebased_sources = rebase_path(invoker.sources, root_build_dir)
+      _rebased_template = rebase_path(invoker.template, root_build_dir)
+
+      args = [
+        "--srcjar=$_rebased_srcjar_path",
+        "--template=$_rebased_template",
+      ]
+      args += _rebased_sources
+      sources += [ invoker.template ]
+
+      outputs = [ _srcjar_path ]
+    }
+  }
+
+  # Declare a target for processing a Jinja template.
+  #
+  # Variables
+  #   input: The template file to be processed.
+  #   includes: List of files {% include %}'ed by input.
+  #   output: Where to save the result.
+  #   variables: (Optional) A list of variables to make available to the template
+  #     processing environment, e.g. ["name=foo", "color=red"].
+  #
+  # Example
+  #   jinja_template("chrome_public_manifest") {
+  #     input = "java/AndroidManifest.xml"
+  #     output = "$target_gen_dir/AndroidManifest.xml"
+  #   }
+  template("jinja_template") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "deps" ])
+      inputs = [ invoker.input ]
+      if (defined(invoker.includes)) {
+        inputs += invoker.includes
+      }
+      script = "//build/android/gyp/jinja_template.py"
+
+      outputs = [ invoker.output ]
+
+      args = [
+        "--loader-base-dir",
+        rebase_path("//", root_build_dir),
+        "--inputs",
+        rebase_path(invoker.input, root_build_dir),
+        "--output",
+        rebase_path(invoker.output, root_build_dir),
+        "--check-includes",
+      ]
+      if (defined(invoker.includes)) {
+        _rebased_includes = rebase_path(invoker.includes, root_build_dir)
+        args += [ "--includes=$_rebased_includes" ]
+      }
+      if (defined(invoker.variables)) {
+        args += [ "--variables=${invoker.variables}" ]
+      }
+    }
+  }
+
+  # Writes native libraries to a NativeLibaries.java file.
+  #
+  # This target will create a single .srcjar. Adding this target to an
+  # android_library target's srcjar_deps will make the generated java files be
+  # included in that library's final outputs.
+  #
+  # Variables:
+  #   native_libraries_list_file: (Optional) Path to file listing all native
+  #     libraries to write.
+  #   version_number: (Optional) String of expected version of 'main' native
+  #     library.
+  #   enable_chromium_linker: (Optional) Whether to use the Chromium linker.
+  #   load_library_from_apk: (Optional) Whether libraries should be loaded from
+  #     the APK without uncompressing.
+  #   use_final_fields: True to use final fields. When false, all other
+  #       variables must not be set.
+  template("write_native_libraries_java") {
+    _native_libraries_file = "$target_gen_dir/$target_name.srcjar"
+    if (target_cpu == "arm" || target_cpu == "arm64") {
+      _cpu_family = "CPU_FAMILY_ARM"
+    } else if (target_cpu == "x86" || target_cpu == "x64") {
+      _cpu_family = "CPU_FAMILY_X86"
+    } else if (target_cpu == "mipsel" || target_cpu == "mips64el") {
+      _cpu_family = "CPU_FAMILY_MIPS"
+    } else {
+      assert(false, "Unsupported CPU family")
+    }
+
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "deps" ])
+      script = "//build/android/gyp/write_native_libraries_java.py"
+      outputs = [ _native_libraries_file ]
+      args = [
+        "--output",
+        rebase_path(_native_libraries_file, root_build_dir),
+        "--cpu-family",
+        _cpu_family,
+      ]
+      if (invoker.use_final_fields) {
+        # Write native_libraries_list_file via depfile rather than specifyin it
+        # as a dep in order allow R8 to run in parallel with native compilation.
+        depfile = "$target_gen_dir/$target_name.d"
+        args += [
+          "--final",
+          "--depfile",
+          rebase_path(depfile, root_build_dir),
+          "--native-libraries-list",
+          rebase_path(invoker.native_libraries_list_file, root_build_dir),
+        ]
+        if (defined(invoker.main_component_library)) {
+          args += [
+            "--main-component-library",
+            invoker.main_component_library,
+          ]
+        }
+        if (defined(invoker.enable_chromium_linker) &&
+            invoker.enable_chromium_linker) {
+          args += [ "--enable-chromium-linker" ]
+        }
+        if (defined(invoker.load_library_from_apk) &&
+            invoker.load_library_from_apk) {
+          args += [ "--load-library-from-apk" ]
+        }
+        if (defined(invoker.use_modern_linker) && invoker.use_modern_linker) {
+          args += [ "--use-modern-linker" ]
+        }
+      }
+    }
+  }
+
+  # Declare a target for a set of Android resources generated at build
+  # time and stored in a single zip archive. The content of the archive
+  # should match the layout of a regular Android res/ folder (but the
+  # archive should not include a top-level res/ directory).
+  #
+  # Note that there is no associated .srcjar, R.txt or package name
+  # associated with this target.
+  #
+  # Variables:
+  #   generated_resources_zip: Generated zip archive path.
+  #   generating_target: Name of the target generating
+  #     generated_resources_zip. This rule will check that it is part
+  #     of its outputs.
+  #   deps: Specifies the dependencies of this target. Any Android resources
+  #     listed here will be also be included *after* this one when compiling
+  #     all resources for a final apk or junit binary. This is useful to
+  #     ensure that the resources of the current target override those of the
+  #     dependency as well (and would not work if you have these deps to the
+  #     generating target's dependencies).
+  #
+  # Example
+  #   _zip_archive = "$target_gen_dir/${target_name}.resources_zip"
+  #
+  #   action("my_resources__create_zip") {
+  #     _depfile = "$target_gen_dir/${target_name}.d"
+  #     script = "//build/path/to/create_my_resources_zip.py"
+  #     args = [
+  #       "--depfile", rebase_path(_depfile, root_build_dir),
+  #       "--output-zip", rebase_path(_zip_archive, root_build_dir),
+  #     ]
+  #     inputs = []
+  #     outputs = _zip_archive
+  #     depfile = _depfile
+  #   }
+  #
+  #   android_generated_resources("my_resources") {
+  #      generated_resources_zip = _zip_archive
+  #      generating_target = ":my_resources__create_zip"
+  #   }
+  #
+  template("android_generated_resources") {
+    forward_variables_from(invoker, [ "testonly" ])
+    _build_config = "$target_gen_dir/${target_name}.build_config.json"
+    _rtxt_out_path = "$target_gen_dir/${target_name}.R.txt"
+    write_build_config("$target_name$build_config_target_suffix") {
+      forward_variables_from(invoker, [ "resource_overlay" ])
+
+      build_config = _build_config
+      resources_zip = invoker.generated_resources_zip
+      type = "android_resources"
+      if (defined(invoker.deps)) {
+        possible_config_deps = invoker.deps
+      }
+      r_text = _rtxt_out_path
+    }
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, [ "visibility" ])
+      public_deps = [
+        ":$target_name$build_config_target_suffix",
+        invoker.generating_target,
+      ]
+      inputs = [ invoker.generated_resources_zip ]
+      outputs = [ _rtxt_out_path ]
+      script = "//build/android/gyp/create_r_txt.py"
+      args = [
+        "--resources-zip-path",
+        rebase_path(invoker.generated_resources_zip, root_build_dir),
+        "--rtxt-path",
+        rebase_path(_rtxt_out_path, root_build_dir),
+      ]
+    }
+  }
+
+  # Declare a target for processing Android resources as Jinja templates.
+  #
+  # This takes an Android resource directory where each resource is a Jinja
+  # template, processes each template, then packages the results in a zip file
+  # which can be consumed by an android resources, library, or apk target.
+  #
+  # If this target is included in the deps of an android resources/library/apk,
+  # the resources will be included with that target.
+  #
+  # Variables
+  #   resources: The list of resources files to process.
+  #   res_dir: The resource directory containing the resources.
+  #   variables: (Optional) A list of variables to make available to the template
+  #     processing environment, e.g. ["name=foo", "color=red"].
+  #
+  # Example
+  #   jinja_template_resources("chrome_public_template_resources") {
+  #     res_dir = "res_template"
+  #     resources = ["res_template/xml/syncable.xml"]
+  #     variables = ["color=red"]
+  #   }
+  template("jinja_template_resources") {
+    _resources_zip = "$target_out_dir/${target_name}.resources.zip"
+    _generating_target_name = "${target_name}__template"
+
+    action_with_pydeps(_generating_target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "deps" ])
+      inputs = invoker.resources
+      script = "//build/android/gyp/jinja_template.py"
+
+      outputs = [ _resources_zip ]
+
+      _rebased_resources = rebase_path(invoker.resources, root_build_dir)
+      args = [
+        "--inputs=${_rebased_resources}",
+        "--inputs-base-dir",
+        rebase_path(invoker.res_dir, root_build_dir),
+        "--outputs-zip",
+        rebase_path(_resources_zip, root_build_dir),
+        "--check-includes",
+      ]
+      if (defined(invoker.variables)) {
+        variables = invoker.variables
+        args += [ "--variables=${variables}" ]
+      }
+    }
+
+    android_generated_resources(target_name) {
+      forward_variables_from(invoker,
+                             TESTONLY_AND_VISIBILITY + [
+                                   "deps",
+                                   "resource_overlay",
+                                 ])
+      generating_target = ":$_generating_target_name"
+      generated_resources_zip = _resources_zip
+    }
+  }
+
+  # Declare a prebuilt android native library.
+  #
+  # This takes a base directory and library name and then looks for the library
+  # in <base dir>/$android_app_abi/<library name>.
+  #
+  # If you depend on this target, the library is stripped and output to the
+  # same locations non-prebuilt libraries are output.
+  #
+  # Variables
+  #   base_dir: Directory where all ABIs of the library live.
+  #   library_name: Name of the library .so file.
+  #
+  # Example
+  #   android_native_prebuilt("elements_native") {
+  #     base_dir = "//third_party/elements"
+  #     lib_name = "elements.so"
+  #   }
+  template("android_native_prebuilt") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "deps",
+                               "testonly",
+                             ])
+      script = "//build/android/gyp/process_native_prebuilt.py"
+      _lib_path = "${invoker.base_dir}/$android_app_abi/${invoker.lib_name}"
+      _stripped_output_path = "$root_out_dir/${invoker.lib_name}"
+      _unstripped_output_path =
+          "$root_out_dir/lib.unstripped/${invoker.lib_name}"
+      inputs = [ _lib_path ]
+      outputs = [
+        _stripped_output_path,
+        _unstripped_output_path,
+      ]
+
+      # Add unstripped output to runtime deps for use by bots during stacktrace
+      # symbolization.
+      data = [ _unstripped_output_path ]
+
+      _rebased_lib_path = rebase_path(_lib_path, root_build_dir)
+      _rebased_stripped_ouput_path =
+          rebase_path(_stripped_output_path, root_build_dir)
+      _rebased_unstripped_ouput_path =
+          rebase_path(_unstripped_output_path, root_build_dir)
+      _strip_tool_path =
+          rebase_path("//buildtools/third_party/eu-strip/bin/eu-strip",
+                      root_build_dir)
+
+      args = [
+        "--strip-path=$_strip_tool_path",
+        "--input-path=$_rebased_lib_path",
+        "--stripped-output-path=$_rebased_stripped_ouput_path",
+        "--unstripped-output-path=$_rebased_unstripped_ouput_path",
+      ]
+    }
+  }
+
+  # Declare an Android resources target
+  #
+  # This creates a resources zip file that will be used when building an Android
+  # library or apk and included into a final apk.
+  #
+  # To include these resources in a library/apk, this target should be listed in
+  # the library's deps. A library/apk will also include any resources used by its
+  # own dependencies.
+  #
+  # Variables
+  #   sources: List of resource files for this target.
+  #   deps: Specifies the dependencies of this target. Any Android resources
+  #     listed in deps will be included by libraries/apks that depend on this
+  #     target.
+  #   alternative_android_sdk_dep: Optional. Alternative Android system
+  #     android java target to use.
+  #   android_manifest: AndroidManifest.xml for this target (optional). Will be
+  #     merged into apks that directly or indirectly depend on this target.
+  #   android_manifest_dep: Target that generates AndroidManifest (if applicable)
+  #   custom_package: java package for generated .java files.
+  #   allow_missing_resources: Do not fail if a resource exists in a directory
+  #      but is not listed in sources.
+  #   shared_resources: If true make a resource package that can be loaded by a
+  #     different application at runtime to access the package's resources.
+  #   resource_overlay: Whether the resources in 'sources' should override
+  #     resources with the same name. Does not affect the behaviour of any
+  #     android_resources() deps of this target. If a target with
+  #     resource_overlay=true depends on another target with
+  #     resource_overlay=true the target with the dependency overrides the
+  #     other.
+  #   r_text_file: (optional) path to pre-generated R.txt to be used when
+  #     generating R.java instead of resource-based aapt-generated one.
+  #   recursive_resource_deps: (optional) whether deps should be walked
+  #     recursively to find resource deps.
+  #
+  # Example:
+  #   android_resources("foo_resources") {
+  #     deps = [":foo_strings_grd"]
+  #     sources = [
+  #       "res/drawable/foo1.xml",
+  #       "res/drawable/foo2.xml",
+  #     ]
+  #     custom_package = "org.chromium.foo"
+  #   }
+  #
+  #   android_resources("foo_resources_overrides") {
+  #     deps = [":foo_resources"]
+  #     sources = [
+  #       "res_overrides/drawable/foo1.xml",
+  #       "res_overrides/drawable/foo2.xml",
+  #     ]
+  #   }
+  template("android_resources") {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+    _base_path = "$target_gen_dir/$target_name"
+    if (defined(invoker.v14_skip)) {
+      not_needed(invoker, [ "v14_skip" ])
+    }
+
+    _res_sources_path = "$target_gen_dir/${invoker.target_name}.res.sources"
+
+    _resources_zip = "$target_out_dir/$target_name.resources.zip"
+    _r_text_out_path = _base_path + "_R.txt"
+    _build_config = _base_path + ".build_config.json"
+    _build_config_target_name = "$target_name$build_config_target_suffix"
+
+    _deps = []
+    if (defined(invoker.deps)) {
+      _deps += invoker.deps
+    }
+
+    if (defined(invoker.alternative_android_sdk_dep)) {
+      _deps += [ invoker.alternative_android_sdk_dep ]
+    } else {
+      _deps += [ "//third_party/android_sdk:android_sdk_java" ]
+    }
+
+    _resource_files = []
+    if (defined(invoker.sources)) {
+      _resource_files += invoker.sources
+    }
+
+    _rebased_resource_files = rebase_path(_resource_files, root_build_dir)
+    write_file(_res_sources_path, _rebased_resource_files)
+
+    # This is necessary so we only lint chromium resources.
+    if (defined(invoker.chromium_code)) {
+      _chromium_code = invoker.chromium_code
+    } else {
+      # Default based on whether target is in third_party.
+      _chromium_code =
+          filter_exclude([ get_label_info(":$target_name", "dir") ],
+                         [ "*\bthird_party\b*" ]) != []
+    }
+
+    write_build_config(_build_config_target_name) {
+      type = "android_resources"
+      build_config = _build_config
+      resources_zip = _resources_zip
+      res_sources_path = _res_sources_path
+      chromium_code = _chromium_code
+
+      forward_variables_from(invoker,
+                             [
+                               "android_manifest",
+                               "android_manifest_dep",
+                               "custom_package",
+                               "mergeable_android_manifests",
+                               "resource_overlay",
+                               "recursive_resource_deps",
+                             ])
+
+      r_text = _r_text_out_path
+      possible_config_deps = _deps
+
+      # Always merge manifests from resources.
+      # * Might want to change this at some point for consistency and clarity,
+      #   but keeping for backwards-compatibility.
+      if (!defined(mergeable_android_manifests) && defined(android_manifest)) {
+        mergeable_android_manifests = [ android_manifest ]
+      }
+    }
+
+    prepare_resources(target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "strip_drawables",
+                               "allow_missing_resources",
+                               "visibility",
+                             ])
+      deps = _deps
+
+      res_sources_path = _res_sources_path
+      sources = _resource_files
+
+      resources_zip = _resources_zip
+      r_text_out_path = _r_text_out_path
+
+      if (defined(invoker.r_text_file)) {
+        r_text_in_path = invoker.r_text_file
+      }
+    }
+  }
+
+  # Declare an Android assets target.
+  #
+  # Defines a set of files to include as assets in a dependent apk.
+  #
+  # To include these assets in an apk, this target should be listed in
+  # the apk's deps, or in the deps of a library target used by an apk.
+  #
+  # Variables
+  #   deps: Specifies the dependencies of this target. Any Android assets
+  #     listed in deps will be included by libraries/apks that depend on this
+  #     target.
+  #   sources: List of files to include as assets.
+  #   renaming_sources: List of files to include as assets and be renamed.
+  #   renaming_destinations: List of asset paths for files in renaming_sources.
+  #   disable_compression: Whether to disable compression for files that are
+  #     known to be compressable (default: false).
+  #   treat_as_locale_paks: Causes base's BuildConfig.java to consider these
+  #     assets to be locale paks.
+  #
+  # Example:
+  # android_assets("content_shell_assets") {
+  #   deps = [
+  #     ":generates_foo",
+  #     ":other_assets",
+  #     ]
+  #   sources = [
+  #     "//path/asset1.png",
+  #     "//path/asset2.png",
+  #     "$target_gen_dir/foo.dat",
+  #   ]
+  # }
+  #
+  # android_assets("overriding_content_shell_assets") {
+  #   deps = [ ":content_shell_assets" ]
+  #   # Override foo.dat from content_shell_assets.
+  #   sources = [ "//custom/foo.dat" ]
+  #   renaming_sources = [ "//path/asset2.png" ]
+  #   renaming_destinations = [ "renamed/asset2.png" ]
+  # }
+  template("android_assets") {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+    _build_config = "$target_gen_dir/$target_name.build_config.json"
+    _build_config_target_name = "$target_name$build_config_target_suffix"
+
+    write_build_config(_build_config_target_name) {
+      type = "android_assets"
+      build_config = _build_config
+
+      forward_variables_from(invoker,
+                             [
+                               "disable_compression",
+                               "treat_as_locale_paks",
+                             ])
+
+      if (defined(invoker.deps)) {
+        possible_config_deps = invoker.deps
+      }
+
+      if (defined(invoker.sources)) {
+        asset_sources = invoker.sources
+      }
+      if (defined(invoker.renaming_sources)) {
+        assert(defined(invoker.renaming_destinations))
+        _source_count = 0
+        foreach(_, invoker.renaming_sources) {
+          _source_count += 1
+        }
+        _dest_count = 0
+        foreach(_, invoker.renaming_destinations) {
+          _dest_count += 1
+        }
+        assert(
+            _source_count == _dest_count,
+            "android_assets() renaming_sources.length != renaming_destinations.length")
+        asset_renaming_sources = invoker.renaming_sources
+        asset_renaming_destinations = invoker.renaming_destinations
+      }
+    }
+
+    group(target_name) {
+      forward_variables_from(invoker, [ "deps" ])
+      public_deps = [ ":$_build_config_target_name" ]
+    }
+  }
+
+  # Declare a group() that supports forwarding java dependency information.
+  #
+  # Example
+  #  java_group("conditional_deps") {
+  #    if (enable_foo) {
+  #      deps = [":foo_java"]
+  #    }
+  #  }
+  template("java_group") {
+    _build_config_vars = [
+      "input_jars_paths",
+      "mergeable_android_manifests",
+      "proguard_configs",
+    ]
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    write_build_config("$target_name$build_config_target_suffix") {
+      forward_variables_from(invoker, _build_config_vars)
+      type = "group"
+      build_config = "$target_gen_dir/${invoker.target_name}.build_config.json"
+      supports_android = true
+      if (defined(invoker.deps)) {
+        possible_config_deps = invoker.deps
+      }
+    }
+    foreach(_group_name,
+            [
+              "header",
+              "impl",
+              "assetres",
+            ]) {
+      java_lib_group("${target_name}__${_group_name}") {
+        forward_variables_from(invoker, [ "deps" ])
+        group_name = _group_name
+      }
+    }
+    group(target_name) {
+      forward_variables_from(invoker,
+                             "*",
+                             _build_config_vars + TESTONLY_AND_VISIBILITY)
+      if (!defined(deps)) {
+        deps = []
+      }
+      deps += [ ":$target_name$build_config_target_suffix" ]
+    }
+  }
+
+  # Declare a Java executable target
+  #
+  # Same as java_library, but also creates a wrapper script within
+  # $root_out_dir/bin.
+  #
+  # Supports all variables of java_library(), plus:
+  #   main_class: When specified, a wrapper script is created within
+  #     $root_build_dir/bin to launch the binary with the given class as the
+  #     entrypoint.
+  #   wrapper_script_name: Filename for the wrapper script (default=target_name)
+  #   wrapper_script_args: List of additional arguments for the wrapper script.
+  #
+  # Example
+  #   java_binary("foo") {
+  #     sources = [ "org/chromium/foo/FooMain.java" ]
+  #     deps = [ ":bar_java" ]
+  #     main_class = "org.chromium.foo.FooMain"
+  #   }
+  #
+  #   java_binary("foo") {
+  #     jar_path = "lib/prebuilt.jar"
+  #     deps = [ ":bar_java" ]
+  #     main_class = "org.chromium.foo.FooMain"
+  #   }
+  template("java_binary") {
+    java_library_impl(target_name) {
+      forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+      type = "java_binary"
+      if (!defined(data_deps)) {
+        data_deps = []
+      }
+      data_deps += [ "//third_party/jdk:java_data" ]
+    }
+  }
+
+  # Declare a Java Annotation Processor.
+  #
+  # Supports all variables of java_library(), plus:
+  #   jar_path: Path to a prebuilt jar. Mutually exclusive with sources &
+  #     srcjar_deps.
+  #   main_class: The fully-quallified class name of the processor's entry
+  #       point.
+  #
+  # Example
+  #   java_annotation_processor("foo_processor") {
+  #     sources = [ "org/chromium/foo/FooProcessor.java" ]
+  #     deps = [ ":bar_java" ]
+  #     main_class = "org.chromium.foo.FooProcessor"
+  #   }
+  #
+  #   java_annotation_processor("foo_processor") {
+  #     jar_path = "lib/prebuilt.jar"
+  #     main_class = "org.chromium.foo.FooMain"
+  #   }
+  #
+  #   java_library("...") {
+  #     annotation_processor_deps = [":foo_processor"]
+  #   }
+  #
+  template("java_annotation_processor") {
+    java_library_impl(target_name) {
+      forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+      type = "java_annotation_processor"
+    }
+  }
+
+  # Declare a Junit executable target
+  #
+  # This target creates an executable from java code for running as a junit test
+  # suite. The executable will be in the output folder's /bin/ directory.
+  #
+  # Supports all variables of java_binary().
+  #
+  # Example
+  #   junit_binary("foo") {
+  #     sources = [ "org/chromium/foo/FooTest.java" ]
+  #     deps = [ ":bar_java" ]
+  #   }
+  template("junit_binary") {
+    testonly = true
+
+    _java_binary_target_name = "${target_name}__java_binary"
+    _test_runner_target_name = "${target_name}__test_runner_script"
+    _main_class = "org.chromium.testing.local.JunitTestMain"
+
+    _build_config = "$target_gen_dir/$target_name.build_config.json"
+    _build_config_target_name = "$target_name$build_config_target_suffix"
+    _deps = [
+      "//testing/android/junit:junit_test_support",
+      "//third_party/android_deps:robolectric_all_java",
+      "//third_party/junit",
+      "//third_party/mockito:mockito_java",
+    ]
+    if (defined(invoker.deps)) {
+      _deps += invoker.deps
+    }
+    if (defined(invoker.alternative_android_sdk_dep)) {
+      _android_sdk_dep = invoker.alternative_android_sdk_dep
+    } else {
+      _android_sdk_dep = "//third_party/android_sdk:android_sdk_java"
+    }
+
+    # a package name or a manifest is required to have resources. This is
+    # added so that junit tests that do not care about the package name can
+    # still use resources without having to explicitly set one.
+    if (defined(invoker.package_name)) {
+      _package_name = invoker.package_name
+    } else if (!defined(invoker.android_manifest)) {
+      _package_name = "org.chromium.test"
+    }
+
+    _resource_arsc_output = "${target_gen_dir}/${target_name}.ap_"
+    _compile_resources_target = "${target_name}__compile_resources"
+    compile_resources(_compile_resources_target) {
+      forward_variables_from(invoker, [ "android_manifest" ])
+      deps = _deps
+      android_sdk_dep = _android_sdk_dep
+      build_config_dep = ":$_build_config_target_name"
+      build_config = _build_config
+      if (defined(_package_name)) {
+        rename_manifest_package = _package_name
+      }
+      if (!defined(android_manifest)) {
+        android_manifest = "//build/android/AndroidManifest.xml"
+      }
+      arsc_output = _resource_arsc_output
+      min_sdk_version = default_min_sdk_version
+      target_sdk_version = android_sdk_version
+    }
+
+    _jni_srcjar_target = "${target_name}__final_jni"
+    _outer_target_name = target_name
+    generate_jni_registration(_jni_srcjar_target) {
+      enable_native_mocks = true
+      require_native_mocks = true
+      targets = [ ":$_outer_target_name" ]
+    }
+
+    java_library_impl(_java_binary_target_name) {
+      forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY + [ "deps" ])
+      type = "junit_binary"
+      main_target_name = invoker.target_name
+
+      # Include the android SDK jar(s) for resource processing.
+      include_android_sdk = true
+
+      # Robolectric can handle deps that set !supports_android as well those
+      # that set requires_android.
+      bypass_platform_checks = true
+      deps = _deps
+      testonly = true
+      main_class = _main_class
+      wrapper_script_name = "helper/$main_target_name"
+
+      # As of April 2021, adding -XX:TieredStopAtLevel=1 does not affect the
+      # wall time of a single robolectric shard, but does reduce the CPU time by
+      # 66%, which makes sharding more effective.
+      tiered_stop_at_level_one = true
+
+      if (!defined(srcjar_deps)) {
+        srcjar_deps = []
+      }
+      srcjar_deps += [
+        ":$_compile_resources_target",
+        ":$_jni_srcjar_target",
+
+        # This dep is required for any targets that depend on //base:base_java.
+        "//build/android:build_config_gen",
+      ]
+    }
+
+    test_runner_script(_test_runner_target_name) {
+      test_name = invoker.target_name
+      test_suite = invoker.target_name
+      test_type = "junit"
+      ignore_all_data_deps = true
+      resource_apk = _resource_arsc_output
+    }
+
+    group(target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "assert_no_deps",
+                               "visibility",
+                             ])
+      public_deps = [
+        ":$_build_config_target_name",
+        ":$_java_binary_target_name",
+        ":$_test_runner_target_name",
+      ]
+    }
+  }
+
+  # Declare a java library target
+  #
+  # Variables
+  #   deps: Specifies the dependencies of this target. Java targets in this list
+  #     will be added to the javac classpath.
+  #   public_deps: Dependencies that this target exposes as part of its public API.
+  #     public_deps do not need to be listed in both the 'deps' and 'public_deps' lists.
+  #   annotation_processor_deps: List of java_annotation_processor targets to
+  #     use when compiling.
+  #
+  #   jar_path: Path to a prebuilt jar. Mutually exclusive with sources &
+  #     srcjar_deps.
+  #   sources: List of .java files included in this library.
+  #   srcjar_deps: List of srcjar dependencies. The .java files in the srcjars
+  #     will be added to sources and be included in this library.
+  #
+  #   input_jars_paths: A list of paths to the jars that should be included
+  #     in the compile-time classpath. These are in addition to library .jars
+  #     that appear in deps.
+  #
+  #   chromium_code: If true, extra analysis warning/errors will be enabled.
+  #   enable_errorprone: If true, enables the errorprone compiler.
+  #   skip_build_server: If true, avoids sending tasks to the build server.
+  #
+  #   jar_excluded_patterns: List of patterns of .class files to exclude.
+  #   jar_included_patterns: List of patterns of .class files to include.
+  #     When omitted, all classes not matched by jar_excluded_patterns are
+  #     included. When specified, all non-matching .class files are stripped.
+  #
+  #   low_classpath_priority: Indicates that the library should be placed at the
+  #     end of the classpath. The default classpath order has libraries ordered
+  #     before the libraries that they depend on. 'low_classpath_priority' is
+  #     useful when one java_library() overrides another via
+  #     'jar_excluded_patterns' and the overriding library does not depend on
+  #     the overridee.
+  #
+  #   output_name: File name for the output .jar (not including extension).
+  #     Defaults to the input .jar file name.
+  #
+  #   proguard_configs: List of proguard configs to use in final apk step for
+  #     any apk that depends on this library.
+  #
+  #   supports_android: If true, Android targets (android_library, android_apk)
+  #     may depend on this target. Note: if true, this target must only use the
+  #     subset of Java available on Android.
+  #   bypass_platform_checks: Disables checks about cross-platform (Java/Android)
+  #     dependencies for this target. This will allow depending on an
+  #     android_library target, for example.
+  #   enable_desugar: If false, disables desugaring of lambdas, etc. Use this
+  #     only when you are sure the library does not require desugaring. E.g.
+  #     to hide warnings shown from desugaring.
+  #
+  #   additional_jar_files: Use to package additional files (Java resources)
+  #     into the output jar. Pass a list of length-2 lists with format:
+  #         [ [ path_to_file, path_to_put_in_jar ] ]
+  #
+  #   javac_args: Additional arguments to pass to javac.
+  #   errorprone_args: Additional arguments to pass to errorprone.
+  #
+  #   data_deps, testonly
+  #
+  # Example
+  #   java_library("foo_java") {
+  #     sources = [
+  #       "org/chromium/foo/Foo.java",
+  #       "org/chromium/foo/FooInterface.java",
+  #       "org/chromium/foo/FooService.java",
+  #     ]
+  #     deps = [
+  #       ":bar_java"
+  #     ]
+  #     srcjar_deps = [
+  #       ":foo_generated_enum"
+  #     ]
+  #     jar_excluded_patterns = [
+  #       "*/FooService.class", "org/chromium/FooService\$*.class"
+  #     ]
+  #   }
+  template("java_library") {
+    java_library_impl(target_name) {
+      forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+      type = "java_library"
+    }
+  }
+
+  # Declare a java library target for a prebuilt jar
+  #
+  # Supports all variables of java_library().
+  #
+  # Example
+  #   java_prebuilt("foo_java") {
+  #     jar_path = "foo.jar"
+  #     deps = [
+  #       ":foo_resources",
+  #       ":bar_java"
+  #     ]
+  #   }
+  template("java_prebuilt") {
+    java_library_impl(target_name) {
+      forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+      type = "java_library"
+    }
+  }
+
+  # Combines all dependent .jar files into a single .jar file.
+  #
+  # Variables:
+  #   output: Path to the output jar.
+  #   override_build_config: Use a pre-existing .build_config. Must be of type
+  #     "apk".
+  #   use_interface_jars: Use all dependent interface .jars rather than
+  #     implementation .jars.
+  #   use_unprocessed_jars: Use unprocessed / undesugared .jars.
+  #   direct_deps_only: Do not recurse on deps.
+  #   jar_excluded_patterns (optional)
+  #     List of globs for paths to exclude.
+  #
+  # Example
+  #   dist_jar("lib_fatjar") {
+  #     deps = [ ":my_java_lib" ]
+  #     output = "$root_build_dir/MyLibrary.jar"
+  #   }
+  template("dist_jar") {
+    # TODO(crbug.com/1042017): Remove.
+    not_needed(invoker, [ "no_build_hooks" ])
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    _supports_android =
+        !defined(invoker.supports_android) || invoker.supports_android
+    _use_interface_jars =
+        defined(invoker.use_interface_jars) && invoker.use_interface_jars
+    _use_unprocessed_jars =
+        defined(invoker.use_unprocessed_jars) && invoker.use_unprocessed_jars
+    _direct_deps_only =
+        defined(invoker.direct_deps_only) && invoker.direct_deps_only
+    assert(!(_use_unprocessed_jars && _use_interface_jars),
+           "Cannot set both use_interface_jars and use_unprocessed_jars")
+
+    _jar_target_name = target_name
+
+    _deps = []
+    if (defined(invoker.deps)) {
+      _deps = invoker.deps
+    }
+    if (_supports_android) {
+      _deps += [ "//third_party/android_sdk:android_sdk_java" ]
+    }
+
+    if (defined(invoker.override_build_config)) {
+      _build_config = invoker.override_build_config
+    } else {
+      _build_config = "$target_gen_dir/$target_name.build_config.json"
+      _build_config_target_name = "$target_name$build_config_target_suffix"
+
+      write_build_config(_build_config_target_name) {
+        type = "dist_jar"
+        supports_android = _supports_android
+        requires_android =
+            defined(invoker.requires_android) && invoker.requires_android
+        possible_config_deps = _deps
+        ignore_dependency_public_deps = _direct_deps_only
+        build_config = _build_config
+      }
+
+      _deps += [ ":$_build_config_target_name" ]
+    }
+
+    _rebased_build_config = rebase_path(_build_config, root_build_dir)
+    action_with_pydeps(_jar_target_name) {
+      forward_variables_from(invoker, [ "data" ])
+      script = "//build/android/gyp/zip.py"
+      depfile = "$target_gen_dir/$target_name.d"
+      deps = _deps
+
+      inputs = [ _build_config ]
+
+      outputs = [ invoker.output ]
+
+      args = [
+        "--depfile",
+        rebase_path(depfile, root_build_dir),
+        "--output",
+        rebase_path(invoker.output, root_build_dir),
+        "--no-compress",
+      ]
+
+      if (_direct_deps_only) {
+        if (_use_interface_jars) {
+          args += [ "--input-zips=@FileArg($_rebased_build_config:javac:interface_classpath)" ]
+        } else if (_use_unprocessed_jars) {
+          args += [
+            "--input-zips=@FileArg($_rebased_build_config:javac:classpath)",
+          ]
+        } else {
+          assert(
+              false,
+              "direct_deps_only does not work without use_interface_jars or use_unprocessed_jars")
+        }
+      } else {
+        if (_use_interface_jars) {
+          args += [ "--input-zips=@FileArg($_rebased_build_config:dist_jar:all_interface_jars)" ]
+        } else if (_use_unprocessed_jars) {
+          args += [ "--input-zips=@FileArg($_rebased_build_config:deps_info:javac_full_classpath)" ]
+        } else {
+          args += [ "--input-zips=@FileArg($_rebased_build_config:deps_info:device_classpath)" ]
+        }
+      }
+      _excludes = []
+      if (defined(invoker.jar_excluded_patterns)) {
+        _excludes += invoker.jar_excluded_patterns
+      }
+      if (_use_interface_jars) {
+        # Turbine adds files like: META-INF/TRANSITIVE/.../Foo.class
+        # These confuse proguard: https://crbug.com/1081443
+        _excludes += [ "META-INF/*" ]
+      }
+      if (_excludes != []) {
+        args += [ "--input-zips-excluded-globs=$_excludes" ]
+      }
+    }
+  }
+
+  # Combines all dependent .jar files into a single proguarded .dex file.
+  #
+  # Variables:
+  #   output: Path to the output dex.
+  #   proguard_enabled: Whether to enable R8.
+  #   proguard_configs: List of proguard configs.
+  #   proguard_enable_obfuscation: Whether to enable obfuscation (default=true).
+  #
+  # Example
+  #   dist_dex("lib_fatjar") {
+  #     deps = [ ":my_java_lib" ]
+  #     output = "$root_build_dir/MyLibrary.jar"
+  #   }
+  template("dist_dex") {
+    _deps = [ "//third_party/android_sdk:android_sdk_java" ]
+    if (defined(invoker.deps)) {
+      _deps += invoker.deps
+    }
+
+    _build_config = "$target_gen_dir/$target_name.build_config.json"
+    _build_config_target_name = "$target_name$build_config_target_suffix"
+
+    write_build_config(_build_config_target_name) {
+      type = "dist_jar"
+      forward_variables_from(invoker,
+                             [
+                               "proguard_configs",
+                               "proguard_enabled",
+                             ])
+      supports_android = true
+      requires_android = true
+      possible_config_deps = _deps
+      build_config = _build_config
+    }
+
+    _deps += [ ":$_build_config_target_name" ]
+
+    dex(target_name) {
+      forward_variables_from(invoker,
+                             TESTONLY_AND_VISIBILITY + [
+                                   "data",
+                                   "data_deps",
+                                   "proguard_configs",
+                                   "proguard_enabled",
+                                   "proguard_enable_obfuscation",
+                                   "min_sdk_version",
+                                 ])
+      deps = _deps
+      build_config = _build_config
+      enable_multidex = false
+      output = invoker.output
+      if (defined(proguard_enabled) && proguard_enabled) {
+        # The individual dependencies would have caught real missing deps in
+        # their respective dex steps. False positives that were suppressed at
+        # per-target dex steps are emitted here since this is using jar files
+        # rather than dex files.
+        ignore_desugar_missing_deps = true
+
+        # When trying to build a stand-alone .dex, don't add in jdk_libs_dex.
+        supports_jdk_library_desugaring = false
+      } else {
+        _rebased_build_config = rebase_path(_build_config, root_build_dir)
+        input_dex_filearg =
+            "@FileArg(${_rebased_build_config}:final_dex:all_dex_files)"
+      }
+    }
+  }
+
+  # Creates an Android .aar library.
+  #
+  # Currently supports:
+  #   * AndroidManifest.xml
+  #   * classes.jar
+  #   * jni/
+  #   * res/
+  #   * R.txt
+  #   * proguard.txt
+  # Does not yet support:
+  #   * public.txt
+  #   * annotations.zip
+  #   * assets/
+  # See: https://developer.android.com/studio/projects/android-library.html#aar-contents
+  #
+  # Variables:
+  #   output: Path to the output .aar.
+  #   proguard_configs: List of proguard configs (optional).
+  #   android_manifest: Path to AndroidManifest.xml (optional).
+  #   native_libraries: list of native libraries (optional).
+  #   direct_deps_only: Do not recurse on deps. (optional, defaults false).
+  #   jar_excluded_patterns (optional): List of globs for paths to exclude.
+  #   jar_included_patterns (optional): List of globs for paths to include.
+  #
+  # Example
+  #   dist_aar("my_aar") {
+  #     deps = [ ":my_java_lib" ]
+  #     output = "$root_build_dir/MyLibrary.aar"
+  #   }
+  template("dist_aar") {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+    _deps = []
+    if (defined(invoker.deps)) {
+      _deps = invoker.deps
+    }
+
+    _direct_deps_only =
+        defined(invoker.direct_deps_only) && invoker.direct_deps_only
+
+    _build_config = "$target_gen_dir/$target_name.build_config.json"
+    _build_config_target_name = "$target_name$build_config_target_suffix"
+
+    write_build_config(_build_config_target_name) {
+      type = "dist_aar"
+      forward_variables_from(invoker, [ "proguard_configs" ])
+      possible_config_deps = _deps
+      supports_android = true
+      requires_android = true
+      ignore_dependency_public_deps = _direct_deps_only
+      build_config = _build_config
+    }
+
+    _deps += [ ":$_build_config_target_name" ]
+
+    _rebased_build_config = rebase_path(_build_config, root_build_dir)
+
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, [ "data" ])
+      depfile = "$target_gen_dir/$target_name.d"
+      deps = _deps
+      script = "//build/android/gyp/dist_aar.py"
+
+      inputs = [ _build_config ]
+
+      # Although these will be listed as deps in the depfile, they must also
+      # appear here so that "gn analyze" knows about them.
+      # https://crbug.com/827197
+      if (defined(invoker.proguard_configs)) {
+        inputs += invoker.proguard_configs
+      }
+
+      outputs = [ invoker.output ]
+
+      args = [
+        "--depfile",
+        rebase_path(depfile, root_build_dir),
+        "--output",
+        rebase_path(invoker.output, root_build_dir),
+        "--dependencies-res-zips=@FileArg($_rebased_build_config:deps_info:dependency_zips)",
+        "--r-text-files=@FileArg($_rebased_build_config:deps_info:dependency_r_txt_files)",
+        "--proguard-configs=@FileArg($_rebased_build_config:deps_info:proguard_all_configs)",
+      ]
+      if (_direct_deps_only) {
+        args += [ "--jars=@FileArg($_rebased_build_config:javac:classpath)" ]
+      } else {
+        args += [ "--jars=@FileArg($_rebased_build_config:deps_info:javac_full_classpath)" ]
+      }
+      if (defined(invoker.android_manifest)) {
+        args += [
+          "--android-manifest",
+          rebase_path(invoker.android_manifest, root_build_dir),
+        ]
+      }
+      if (defined(invoker.native_libraries) && invoker.native_libraries != []) {
+        inputs += invoker.native_libraries
+        _rebased_native_libraries =
+            rebase_path(invoker.native_libraries, root_build_dir)
+
+        args += [
+          "--native-libraries=$_rebased_native_libraries",
+          "--abi=$android_app_abi",
+        ]
+      }
+      if (defined(invoker.jar_excluded_patterns)) {
+        args += [ "--jar-excluded-globs=${invoker.jar_excluded_patterns}" ]
+      }
+      if (defined(invoker.jar_included_patterns)) {
+        args += [ "--jar-included-globs=${invoker.jar_included_patterns}" ]
+      }
+      if (defined(invoker.resource_included_patterns)) {
+        args += [
+          "--resource-included-globs=${invoker.resource_included_patterns}",
+        ]
+      }
+    }
+  }
+
+  # Declare an Android library target
+  #
+  # This target creates an Android library containing java code and Android
+  # resources.
+  #
+  # Supports all variables of java_library(), plus:
+  #   deps: In addition to defining java deps, this can also include
+  #     android_assets() and android_resources() targets.
+  #   alternative_android_sdk_ijar: if set, the given android_sdk_ijar file
+  #     replaces the default android_sdk_ijar.
+  #   alternative_android_sdk_ijar_dep: the target that generates
+  #      alternative_android_sdk_ijar, must be set if alternative_android_sdk_ijar
+  #      is used.
+  #   alternative_android_sdk_jar: actual jar corresponding to
+  #      alternative_android_sdk_ijar, must be set if alternative_android_sdk_ijar
+  #      is used.
+  #
+  # Example
+  #   android_library("foo_java") {
+  #     sources = [
+  #       "android/org/chromium/foo/Foo.java",
+  #       "android/org/chromium/foo/FooInterface.java",
+  #       "android/org/chromium/foo/FooService.java",
+  #     ]
+  #     deps = [
+  #       ":bar_java"
+  #     ]
+  #     srcjar_deps = [
+  #       ":foo_generated_enum"
+  #     ]
+  #     jar_excluded_patterns = [
+  #       "*/FooService.class", "org/chromium/FooService\$*.class"
+  #     ]
+  #   }
+  template("android_library") {
+    java_library(target_name) {
+      forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+      supports_android = true
+      requires_android = true
+
+      if (!defined(jar_excluded_patterns)) {
+        jar_excluded_patterns = []
+      }
+      jar_excluded_patterns += [
+        "*/R.class",
+        "*/R\$*.class",
+        "*/Manifest.class",
+        "*/Manifest\$*.class",
+        "*/GEN_JNI.class",
+      ]
+    }
+  }
+
+  # Declare an Android library target for a prebuilt jar
+  #
+  # This target creates an Android library containing java code and Android
+  # resources.
+  #
+  # Supports all variables of android_library().
+  #
+  # Example
+  #   android_java_prebuilt("foo_java") {
+  #     jar_path = "foo.jar"
+  #     deps = [
+  #       ":foo_resources",
+  #       ":bar_java"
+  #     ]
+  #   }
+  template("android_java_prebuilt") {
+    android_library(target_name) {
+      forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    }
+  }
+
+  template("android_system_java_prebuilt") {
+    java_library_impl(target_name) {
+      forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+      supports_android = true
+      type = "system_java_library"
+    }
+  }
+
+  # Creates org/chromium/build/BuildConfig.java
+  # This doesn't really belong in //build since it genates a file for //base.
+  # However, we don't currently have a better way to include this file in all
+  # apks that depend on //base:base_java.
+  #
+  # Variables:
+  #   use_final_fields: True to use final fields. When false, all other
+  #       variables must not be set.
+  #   enable_multidex: Value for ENABLE_MULTIDEX.
+  #   min_sdk_version: Value for MIN_SDK_VERSION.
+  #   bundles_supported: Whether or not this target can be treated as a bundle.
+  #   resources_version_variable:
+  #   is_incremental_install:
+  #   isolated_splits_enabled: Value for ISOLATED_SPLITS_ENABLED.
+  template("generate_build_config_srcjar") {
+    java_cpp_template(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+      sources = [ "//build/android/java/templates/BuildConfig.template" ]
+      defines = []
+
+      # Set these even when !use_final_fields so that they have correct default
+      # values within junit_binary(), which ignores jar_excluded_patterns.
+      if (enable_java_asserts) {
+        defines += [ "_ENABLE_ASSERTS" ]
+      }
+      if (use_cfi_diag || is_ubsan || is_ubsan_security || is_ubsan_vptr) {
+        defines += [ "_IS_UBSAN" ]
+      }
+
+      if (is_chrome_branded) {
+        defines += [ "_IS_CHROME_BRANDED" ]
+      }
+
+      if (is_chromecast && chromecast_branding == "internal") {
+        defines += [ "_IS_CHROMECAST_BRANDING_INTERNAL" ]
+      }
+
+      if (defined(invoker.bundles_supported) && invoker.bundles_supported) {
+        defines += [ "_BUNDLES_SUPPORTED" ]
+      }
+
+      if (defined(invoker.isolated_splits_enabled) &&
+          invoker.isolated_splits_enabled) {
+        defines += [ "_ISOLATED_SPLITS_ENABLED" ]
+      }
+
+      if (defined(invoker.is_incremental_install) &&
+          invoker.is_incremental_install) {
+        defines += [ "_IS_INCREMENTAL_INSTALL" ]
+      }
+
+      if (invoker.use_final_fields) {
+        forward_variables_from(invoker, [ "deps" ])
+        defines += [ "USE_FINAL" ]
+        if (invoker.enable_multidex) {
+          defines += [ "ENABLE_MULTIDEX" ]
+        }
+        if (defined(invoker.min_sdk_version)) {
+          defines += [ "_MIN_SDK_VERSION=${invoker.min_sdk_version}" ]
+        }
+        if (defined(invoker.resources_version_variable)) {
+          defines += [
+            "_RESOURCES_VERSION_VARIABLE=${invoker.resources_version_variable}",
+          ]
+        }
+      }
+    }
+  }
+
+  # Creates ProductConfig.java, a file containing product-specific configuration.
+  #
+  # Currently, this includes the list of locales, both in their compressed and
+  # uncompressed format, as well as library loading
+  #
+  # Variables:
+  #   build_config: Path to build_config used for locale lists.
+  #   is_bundle_module: Whether or not this target is part of a bundle build.
+  #   java_package: Java package for the generated class.
+  #   use_chromium_linker:
+  #   use_modern_linker:
+  template("generate_product_config_srcjar") {
+    java_cpp_template(target_name) {
+      defines = []
+      _use_final =
+          defined(invoker.build_config) ||
+          defined(invoker.use_chromium_linker) ||
+          defined(invoker.use_modern_linker) || defined(invoker.is_bundle)
+      if (_use_final) {
+        defines += [ "USE_FINAL" ]
+      }
+
+      sources = [ "//build/android/java/templates/ProductConfig.template" ]
+      defines += [ "PACKAGE=${invoker.java_package}" ]
+
+      _use_chromium_linker =
+          defined(invoker.use_chromium_linker) && invoker.use_chromium_linker
+      _use_modern_linker =
+          defined(invoker.use_modern_linker) && invoker.use_modern_linker
+      _is_bundle = defined(invoker.is_bundle_module) && invoker.is_bundle_module
+      defines += [
+        "USE_CHROMIUM_LINKER_VALUE=$_use_chromium_linker",
+        "USE_MODERN_LINKER_VALUE=$_use_modern_linker",
+        "IS_BUNDLE_VALUE=$_is_bundle",
+      ]
+      if (defined(invoker.build_config)) {
+        forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "deps" ])
+        _rebased_build_config =
+            rebase_path(invoker.build_config, root_build_dir)
+        defines += [ "LOCALE_LIST=@FileArg($_rebased_build_config:deps_info:locales_java_list)" ]
+      }
+    }
+  }
+
+  # Declare an Android app module target, which is used as the basis for an
+  # Android APK or an Android app bundle module.
+  #
+  # Supports all variables of android_library(), plus:
+  #   android_manifest: Path to AndroidManifest.xml. NOTE: This manifest must
+  #     not contain a <uses-sdk> element. Use [min|target|max]_sdk_version
+  #     instead.
+  #   android_manifest_dep: Target that generates AndroidManifest (if applicable)
+  #   png_to_webp: If true, pngs (with the exception of 9-patch) are
+  #     converted to webp during resource packaging.
+  #   loadable_modules: List of paths to native libraries to include. Different
+  #     from |shared_libraries| in that:
+  #       * dependencies of this .so are not automatically included
+  #       * ".cr.so" is never added
+  #       * they are not side-loaded when incremental_install=true.
+  #       * load_library_from_apk, use_chromium_linker,
+  #         and enable_relocation_packing do not apply
+  #     Use this instead of shared_libraries when you are going to load the library
+  #     conditionally, and only when shared_libraries doesn't work for you.
+  #   secondary_abi_loadable_modules: This is the loadable_modules analog to
+  #     secondary_abi_shared_libraries.
+  #   shared_libraries: List shared_library targets to bundle. If these
+  #     libraries depend on other shared_library targets, those dependencies will
+  #     also be included in the apk (e.g. for is_component_build).
+  #   secondary_abi_shared_libraries: secondary abi shared_library targets to
+  #     bundle. If these libraries depend on other shared_library targets, those
+  #     dependencies will also be included in the apk (e.g. for is_component_build).
+  #   native_lib_placeholders: List of placeholder filenames to add to the apk
+  #     (optional).
+  #   secondary_native_lib_placeholders: List of placeholder filenames to add to
+  #     the apk for the secondary ABI (optional).
+  #   generate_buildconfig_java: If defined and false, skip generating the
+  #     BuildConfig java class describing the build configuration. The default
+  #     is true when building with Chromium for non-test APKs.
+  #   generate_final_jni: If defined and false, skip generating the
+  #     GEN_JNI srcjar.
+  #   jni_registration_header: If specified, causes the
+  #     ${target_name}__final_jni target to additionally output a
+  #     header file to this path for use with manual JNI registration.
+  #   jni_sources_exclusions: List of source path to exclude from the
+  #     final_jni step.
+  #   aapt_locale_allowlist: If set, all locales not in this list will be
+  #     stripped from resources.arsc.
+  #   resource_exclusion_regex: Causes all drawable images matching the regex to
+  #     be excluded (mipmaps are still included).
+  #   resource_exclusion_exceptions: A list of globs used when
+  #     resource_exclusion_regex is set. Files that match this list will
+  #     still be included.
+  #   resource_values_filter_rules: List of "source_path:name_regex" used to
+  #     filter out unwanted values/ resources.
+  #   shared_resources: True if this is a runtime shared library APK, like
+  #     the system_webview_apk target. Ensures that its resources can be
+  #     used by the loading application process.
+  #   app_as_shared_lib: True if this is a regular application apk that can
+  #     also serve as a runtime shared library, like the monochrome_public_apk
+  #     target. Ensures that the resources are usable both by the APK running
+  #     as an application, or by another process that loads it at runtime.
+  #   shared_resources_allowlist_target: Optional name of a target specifying
+  #     an input R.txt file that lists the resources that can be exported
+  #     by the APK when shared_resources or app_as_shared_lib is defined.
+  #   uncompress_shared_libraries: True if shared libraries should be stored
+  #     uncompressed in the APK. Must be unset or true if load_library_from_apk
+  #     is set to true.
+  #   uncompress_dex: Store final .dex files uncompressed in the apk.
+  #   strip_resource_names: True if resource names should be stripped from the
+  #     resources.arsc file in the apk or module.
+  #   strip_unused_resources: True if unused resources should be stripped from
+  #     the apk or module.
+  #   short_resource_paths: True if resource paths should be shortened in the
+  #     apk or module.
+  #   resources_config_paths: List of paths to the aapt2 optimize config files
+  #     that tags resources with acceptable/non-acceptable optimizations.
+  #   expected_android_manifest: Enables verification of expected merged
+  #     manifest based on a golden file.
+  #   resource_ids_provider_dep: If passed, this target will use the resource
+  #     IDs generated by {resource_ids_provider_dep}__compile_res during
+  #     resource compilation.
+  #   enforce_resource_overlays_in_tests: Enables check for testonly targets that
+  #     dependent resource targets which override another target set
+  #     overlay_resources=true. This check is on for non-test targets and
+  #     cannot be disabled.
+  #   static_library_dependent_targets: A list of scopes describing targets that
+  #     use this target as a static library. Common Java code from the targets
+  #     listed in static_library_dependent_targets will be moved into this
+  #     target. Scope members are name and is_resource_ids_provider.
+  #   static_library_provider: Specifies a single target that this target will
+  #     use as a static library APK.
+  #   static_library_synchronized_proguard: When proguard is enabled, the
+  #     static_library_provider target will provide the dex file(s) for this
+  #     target.
+  #   min_sdk_version: The minimum Android SDK version this target supports.
+  #     Optional, default $default_min_sdk_version.
+  #   target_sdk_version: The target Android SDK version for this target.
+  #     Optional, default to android_sdk_version.
+  #   max_sdk_version: The maximum Android SDK version this target supports.
+  #     Optional, default not set.
+  #   require_native_mocks: Enforce that any native calls using
+  #     org.chromium.base.annotations.NativeMethods must have a mock set
+  #     (optional).
+  #   enable_native_mocks: Allow native calls using
+  #     org.chromium.base.annotations.NativeMethods to be mocked in tests
+  #     (optional).
+  #   product_config_java_packages: Optional list of java packages. If given, a
+  #     ProductConfig.java file will be generated for each package.
+  #   enable_proguard_checks: Turns on -checkdiscard directives and missing
+  #     symbols check in the proguard step (default=true).
+  #   disable_r8_outlining: Turn off outlining during the proguard step.
+  #   annotation_processor_deps: List of java_annotation_processor targets to
+  #     use when compiling the sources given to this target (optional).
+  #   processor_args_javac: List of args to pass to annotation processors when
+  #     compiling sources given to this target (optional).
+  #   bundles_supported: Enable Java code to treat this target as a bundle
+  #     whether (by default determined by the target type).
+  #   main_component_library: Specifies the name of the base component's library
+  #     in a component build. If given, the system will find dependent native
+  #     libraries at runtime by inspecting this library (optional).
+  #   expected_libs_and_assets: Verify the list of included native libraries
+  #     and assets is consistent with the given expectation file.
+  #   expected_libs_and_assets_base: Treat expected_libs_and_assets as a diff
+  #     with this file as the base.
+  #   expected_proguard_config: Checks that the merged set of proguard flags
+  #     matches the given config.
+  #   expected_proguard_config_base: Treat expected_proguard_config as a diff
+  #     with this file as the base.
+  template("android_apk_or_module") {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    assert(defined(invoker.android_manifest))
+    _base_path = "$target_out_dir/$target_name/$target_name"
+    _build_config = "$target_gen_dir/$target_name.build_config.json"
+    _build_config_target = "$target_name$build_config_target_suffix"
+
+    _min_sdk_version = default_min_sdk_version
+    _target_sdk_version = android_sdk_version
+    if (defined(invoker.min_sdk_version)) {
+      _min_sdk_version = invoker.min_sdk_version
+    }
+    if (defined(invoker.target_sdk_version)) {
+      _target_sdk_version = invoker.target_sdk_version
+    }
+
+    _template_name = target_name
+
+    _is_bundle_module =
+        defined(invoker.is_bundle_module) && invoker.is_bundle_module
+    if (_is_bundle_module) {
+      _is_base_module =
+          defined(invoker.is_base_module) && invoker.is_base_module
+    }
+
+    _enable_multidex =
+        !defined(invoker.enable_multidex) || invoker.enable_multidex
+
+    if (!_is_bundle_module) {
+      _final_apk_path = invoker.final_apk_path
+      _final_rtxt_path = "${_final_apk_path}.R.txt"
+    }
+
+    _res_size_info_path = "$target_out_dir/$target_name.ap_.info"
+    if (!_is_bundle_module) {
+      _final_apk_path_no_ext_list =
+          process_file_template([ _final_apk_path ],
+                                "{{source_dir}}/{{source_name_part}}")
+      _final_apk_path_no_ext = _final_apk_path_no_ext_list[0]
+      not_needed([ "_final_apk_path_no_ext" ])
+    }
+
+    # Non-base bundle modules create only proto resources.
+    if (!_is_bundle_module || _is_base_module) {
+      _arsc_resources_path = "$target_out_dir/$target_name.ap_"
+    }
+    if (_is_bundle_module) {
+      # Path to the intermediate proto-format resources zip file.
+      _proto_resources_path = "$target_out_dir/$target_name.proto.ap_"
+    } else {
+      # resource_sizes.py needs to be able to find the unpacked resources.arsc
+      # file based on apk name to compute normatlized size.
+      _resource_sizes_arsc_path =
+          "$root_out_dir/arsc/" +
+          rebase_path(_final_apk_path_no_ext, root_build_dir) + ".ap_"
+    }
+
+    if (defined(invoker.version_code)) {
+      _version_code = invoker.version_code
+    } else {
+      _version_code = android_default_version_code
+    }
+
+    if (android_override_version_code != "") {
+      _version_code = android_override_version_code
+    }
+
+    if (defined(invoker.version_name)) {
+      _version_name = invoker.version_name
+    } else {
+      _version_name = android_default_version_name
+    }
+
+    if (android_override_version_name != "") {
+      _version_name = android_override_version_name
+    }
+
+    _deps = []
+    if (defined(invoker.deps)) {
+      _deps = invoker.deps
+    }
+
+    _srcjar_deps = []
+    if (defined(invoker.srcjar_deps)) {
+      _srcjar_deps = invoker.srcjar_deps
+    }
+
+    _android_root_manifest_deps = []
+    if (defined(invoker.android_manifest_dep)) {
+      _android_root_manifest_deps = [ invoker.android_manifest_dep ]
+    }
+    _android_root_manifest = invoker.android_manifest
+
+    _use_chromium_linker =
+        defined(invoker.use_chromium_linker) && invoker.use_chromium_linker
+    _use_modern_linker =
+        defined(invoker.use_modern_linker) && invoker.use_modern_linker
+
+    _load_library_from_apk =
+        defined(invoker.load_library_from_apk) && invoker.load_library_from_apk
+
+    not_needed([
+                 "_use_chromium_linker",
+                 "_use_modern_linker",
+               ])
+    assert(!_load_library_from_apk || _use_chromium_linker,
+           "load_library_from_apk requires use_chromium_linker")
+
+    # Make sure that uncompress_shared_libraries is set to true if
+    # load_library_from_apk is true.
+    if (defined(invoker.uncompress_shared_libraries)) {
+      _uncompress_shared_libraries = invoker.uncompress_shared_libraries
+      assert(!_load_library_from_apk || _uncompress_shared_libraries)
+    } else {
+      _uncompress_shared_libraries = _load_library_from_apk
+    }
+
+    # The dependency that makes the chromium linker, if any is needed.
+    _native_libs_deps = []
+    _shared_libraries_is_valid =
+        defined(invoker.shared_libraries) && invoker.shared_libraries != []
+
+    if (_shared_libraries_is_valid) {
+      _native_libs_deps += invoker.shared_libraries
+
+      # Write shared library output files of all dependencies to a file. Those
+      # will be the shared libraries packaged into the APK.
+      _shared_library_list_file =
+          "$target_gen_dir/${_template_name}.native_libs"
+      generated_file("${_template_name}__shared_library_list") {
+        deps = _native_libs_deps
+        outputs = [ _shared_library_list_file ]
+        data_keys = [ "shared_libraries" ]
+        walk_keys = [ "shared_libraries_barrier" ]
+        rebase = root_build_dir
+      }
+    } else {
+      # Must exist for instrumentation_test_apk() to depend on.
+      group("${_template_name}__shared_library_list") {
+      }
+    }
+
+    _secondary_abi_native_libs_deps = []
+
+    if (defined(invoker.secondary_abi_shared_libraries) &&
+        invoker.secondary_abi_shared_libraries != []) {
+      _secondary_abi_native_libs_deps = invoker.secondary_abi_shared_libraries
+
+      # Write shared library output files of all dependencies to a file. Those
+      # will be the shared libraries packaged into the APK.
+      _secondary_abi_shared_library_list_file =
+          "$target_gen_dir/${_template_name}.secondary_abi_native_libs"
+      generated_file("${_template_name}__secondary_abi_shared_library_list") {
+        deps = _secondary_abi_native_libs_deps
+        outputs = [ _secondary_abi_shared_library_list_file ]
+        data_keys = [ "shared_libraries" ]
+        walk_keys = [ "shared_libraries_barrier" ]
+        rebase = root_build_dir
+      }
+    } else {
+      # Must exist for instrumentation_test_apk() to depend on.
+      group("${_template_name}__secondary_abi_shared_library_list") {
+      }
+    }
+
+    _rebased_build_config = rebase_path(_build_config, root_build_dir)
+    assert(_rebased_build_config != "")  # Mark as used.
+
+    _generate_buildconfig_java = !defined(invoker.apk_under_test)
+    if (defined(invoker.generate_buildconfig_java)) {
+      _generate_buildconfig_java = invoker.generate_buildconfig_java
+    }
+
+    _generate_productconfig_java = defined(invoker.product_config_java_packages)
+
+    # JNI generation usually goes hand-in-hand with buildconfig generation.
+    _generate_final_jni = _generate_buildconfig_java
+    if (defined(invoker.generate_final_jni)) {
+      _generate_final_jni = invoker.generate_final_jni
+    }
+
+    _proguard_enabled =
+        defined(invoker.proguard_enabled) && invoker.proguard_enabled
+
+    if (!_is_bundle_module && _proguard_enabled) {
+      _proguard_mapping_path = "$_final_apk_path.mapping"
+    }
+
+    # TODO(http://crbug.com/901465): Move shared Java code to static libraries
+    # when !_proguard_enabled too.
+    _is_static_library_provider =
+        defined(invoker.static_library_dependent_targets) && _proguard_enabled
+    if (_is_static_library_provider) {
+      _static_library_sync_dex_path = "$_base_path.synchronized.r8dex.jar"
+      _resource_ids_provider_deps = []
+      foreach(_target, invoker.static_library_dependent_targets) {
+        if (_target.is_resource_ids_provider) {
+          assert(_resource_ids_provider_deps == [],
+                 "Can only have 1 resource_ids_provider_dep")
+          _resource_ids_provider_deps += [ _target.name ]
+        }
+      }
+      _resource_ids_provider_dep = _resource_ids_provider_deps[0]
+    } else if (defined(invoker.resource_ids_provider_dep)) {
+      _resource_ids_provider_dep = invoker.resource_ids_provider_dep
+    }
+
+    if (_is_static_library_provider) {
+      _shared_resources_allowlist_target = _resource_ids_provider_dep
+    } else if (defined(invoker.shared_resources_allowlist_target)) {
+      _shared_resources_allowlist_target =
+          invoker.shared_resources_allowlist_target
+    }
+
+    _uses_static_library = defined(invoker.static_library_provider)
+    _uses_static_library_synchronized_proguard =
+        defined(invoker.static_library_synchronized_proguard) &&
+        invoker.static_library_synchronized_proguard
+
+    if (_uses_static_library_synchronized_proguard) {
+      assert(_uses_static_library)
+
+      # These will be provided by the static library APK.
+      _generate_buildconfig_java = false
+      _generate_final_jni = false
+    }
+
+    # TODO(crbug.com/864142): Allow incremental installs of bundle modules.
+    _incremental_apk = !_is_bundle_module &&
+                       !(defined(invoker.never_incremental) &&
+                         invoker.never_incremental) && incremental_install
+    if (_incremental_apk) {
+      _target_dir_name = get_label_info(target_name, "dir")
+      _incremental_install_json_path = "$root_out_dir/gen.runtime/$_target_dir_name/$target_name.incremental.json"
+      _incremental_apk_path = "${_final_apk_path_no_ext}_incremental.apk"
+    }
+
+    if (!_incremental_apk) {
+      # Bundle modules don't build the dex here, but need to write this path
+      # to their .build_config.json file.
+      if (_proguard_enabled) {
+        _final_dex_path = "$_base_path.r8dex.jar"
+      } else {
+        _final_dex_path = "$_base_path.mergeddex.jar"
+      }
+    }
+
+    _android_manifest =
+        "$target_gen_dir/${_template_name}_manifest/AndroidManifest.xml"
+    _merge_manifest_target = "${_template_name}__merge_manifests"
+    merge_manifests(_merge_manifest_target) {
+      forward_variables_from(invoker,
+                             [
+                               "manifest_package",
+                               "max_sdk_version",
+                             ])
+      input_manifest = _android_root_manifest
+      output_manifest = _android_manifest
+      build_config = _build_config
+      min_sdk_version = _min_sdk_version
+      target_sdk_version = _target_sdk_version
+      deps = _android_root_manifest_deps + [ ":$_build_config_target" ]
+    }
+
+    _final_deps = []
+
+    _enable_main_dex_list = _enable_multidex && _min_sdk_version < 21
+    if (_enable_main_dex_list) {
+      _generated_proguard_main_dex_config =
+          "$_base_path.resources.main-dex-proguard.txt"
+    }
+    _generated_proguard_config = "$_base_path.resources.proguard.txt"
+
+    if (_generate_buildconfig_java &&
+        defined(invoker.product_version_resources_dep)) {
+      # Needs to be added as a .build_config.json dep to pick up resources.
+      _deps += [ invoker.product_version_resources_dep ]
+    }
+
+    if (defined(invoker.alternative_android_sdk_dep)) {
+      _android_sdk_dep = invoker.alternative_android_sdk_dep
+    } else {
+      _android_sdk_dep = "//third_party/android_sdk:android_sdk_java"
+    }
+
+    if (defined(_shared_resources_allowlist_target)) {
+      _allowlist_gen_dir =
+          get_label_info(_shared_resources_allowlist_target, "target_gen_dir")
+      _allowlist_target_name =
+          get_label_info(_shared_resources_allowlist_target, "name")
+      _allowlist_r_txt_path =
+          "${_allowlist_gen_dir}/${_allowlist_target_name}" +
+          "__compile_resources_R.txt"
+      _allowlist_deps =
+          "${_shared_resources_allowlist_target}__compile_resources"
+    }
+
+    _compile_resources_target = "${_template_name}__compile_resources"
+    _compile_resources_rtxt_out =
+        "${target_gen_dir}/${_compile_resources_target}_R.txt"
+    _compile_resources_emit_ids_out =
+        "${target_gen_dir}/${_compile_resources_target}.resource_ids"
+    compile_resources(_compile_resources_target) {
+      forward_variables_from(invoker,
+                             [
+                               "aapt_locale_allowlist",
+                               "app_as_shared_lib",
+                               "enforce_resource_overlays_in_tests",
+                               "expected_android_manifest",
+                               "expected_android_manifest_base",
+                               "extra_verification_manifest",
+                               "extra_verification_manifest_dep",
+                               "manifest_package",
+                               "max_sdk_version",
+                               "no_xml_namespaces",
+                               "package_id",
+                               "package_name",
+                               "png_to_webp",
+                               "r_java_root_package_name",
+                               "resource_exclusion_exceptions",
+                               "resource_exclusion_regex",
+                               "resource_values_filter_rules",
+                               "shared_resources",
+                               "shared_resources_allowlist_locales",
+                               "uses_split",
+                             ])
+      android_manifest = _android_manifest
+      android_manifest_dep = ":$_merge_manifest_target"
+      version_code = _version_code
+      version_name = _version_name
+      min_sdk_version = _min_sdk_version
+      target_sdk_version = _target_sdk_version
+
+      if (defined(expected_android_manifest)) {
+        top_target_name = _template_name
+      }
+
+      if (defined(_resource_ids_provider_dep)) {
+        resource_ids_provider_dep = _resource_ids_provider_dep
+      }
+
+      if (defined(invoker.post_process_package_resources_script)) {
+        post_process_script = invoker.post_process_package_resources_script
+      }
+      r_text_out_path = _compile_resources_rtxt_out
+      emit_ids_out_path = _compile_resources_emit_ids_out
+      size_info_path = _res_size_info_path
+      proguard_file = _generated_proguard_config
+      if (_enable_main_dex_list) {
+        proguard_file_main_dex = _generated_proguard_main_dex_config
+      }
+
+      build_config = _build_config
+      build_config_dep = ":$_build_config_target"
+      android_sdk_dep = _android_sdk_dep
+      deps = _deps
+
+      # The static library uses the R.txt files generated by the
+      # static_library_dependent_targets when generating the final R.java file.
+      if (_is_static_library_provider) {
+        foreach(_dep, invoker.static_library_dependent_targets) {
+          deps += [ "${_dep.name}__compile_resources" ]
+        }
+      }
+
+      if (defined(invoker.apk_under_test)) {
+        # Set the arsc package name to match the apk_under_test package name
+        # So that test resources can references under_test resources via
+        # @type/name syntax.
+        r_java_root_package_name = "test"
+        arsc_package_name =
+            "@FileArg($_rebased_build_config:deps_info:arsc_package_name)"
+
+        # Passing in the --emit-ids mapping will cause aapt2 to assign resources
+        # IDs that do not conflict with those from apk_under_test.
+        assert(!defined(resource_ids_provider_dep))
+        resource_ids_provider_dep = invoker.apk_under_test
+
+        include_resource =
+            get_label_info(invoker.apk_under_test, "target_out_dir") + "/" +
+            get_label_info(invoker.apk_under_test, "name") + ".ap_"
+        _link_against = invoker.apk_under_test
+      }
+
+      if (_is_bundle_module) {
+        is_bundle_module = true
+        proto_output = _proto_resources_path
+
+        if (defined(invoker.base_module_target)) {
+          include_resource =
+              get_label_info(invoker.base_module_target, "target_out_dir") +
+              "/" + get_label_info(invoker.base_module_target, "name") + ".ap_"
+          _link_against = invoker.base_module_target
+        }
+      }
+
+      if (defined(_link_against)) {
+        deps += [ "${_link_against}__compile_resources" ]
+        include_resource = get_label_info(_link_against, "target_out_dir") +
+                           "/" + get_label_info(_link_against, "name") + ".ap_"
+      }
+
+      # Bundle modules have to reference resources from the base module.
+      if (!_is_bundle_module || _is_base_module) {
+        arsc_output = _arsc_resources_path
+      }
+
+      if (defined(_shared_resources_allowlist_target)) {
+        # Used to ensure that the WebView resources are properly shared
+        # (i.e. are non-final and with package ID 0).
+        shared_resources_allowlist = _allowlist_r_txt_path
+        deps += [ _allowlist_deps ]
+      }
+    }
+    _srcjar_deps += [ ":$_compile_resources_target" ]
+
+    # We don't ship apks anymore, only optimize bundle builds
+    if (_is_bundle_module) {
+      _short_resource_paths =
+          defined(invoker.short_resource_paths) &&
+          invoker.short_resource_paths && enable_arsc_obfuscation
+      _strip_resource_names =
+          defined(invoker.strip_resource_names) &&
+          invoker.strip_resource_names && enable_arsc_obfuscation
+      _strip_unused_resources = defined(invoker.strip_unused_resources) &&
+                                invoker.strip_unused_resources
+      _optimize_resources = _strip_resource_names || _short_resource_paths ||
+                            _strip_unused_resources
+    }
+
+    if (_is_bundle_module && _optimize_resources) {
+      _optimized_proto_resources_path =
+          "$target_out_dir/$target_name.optimized.proto.ap_"
+      if (_short_resource_paths) {
+        _resources_path_map_out_path =
+            "${target_gen_dir}/${_template_name}_resources_path_map.txt"
+      }
+      _optimize_resources_target = "${_template_name}__optimize_resources"
+      optimize_resources(_optimize_resources_target) {
+        deps = _deps + [ ":$_compile_resources_target" ]
+        short_resource_paths = _short_resource_paths
+        strip_resource_names = _strip_resource_names
+        if (_short_resource_paths) {
+          resources_path_map_out_path = _resources_path_map_out_path
+        }
+        r_text_path = _compile_resources_rtxt_out
+        proto_input_path = _proto_resources_path
+        optimized_proto_output = _optimized_proto_resources_path
+        if (_strip_unused_resources) {
+          # These need to be kept in sync with the target names + output paths
+          # in the android_app_bundle template.
+          _unused_resources_target = "${_template_name}__unused_resources"
+          _unused_resources_config_path =
+              "$target_gen_dir/${_template_name}_unused_resources.config"
+          resources_config_paths = [ _unused_resources_config_path ]
+          deps += [ ":$_unused_resources_target" ]
+        } else {
+          resources_config_paths = []
+        }
+        if (defined(invoker.resources_config_paths)) {
+          resources_config_paths += invoker.resources_config_paths
+        }
+      }
+    }
+
+    if (!_is_bundle_module) {
+      # Output the R.txt file to a more easily discoverable location for
+      # archiving. This is necessary when stripping resource names so that we
+      # have an archive of resource names to ids for shipped apks (for
+      # debugging purposes). We copy the file rather than change the location
+      # of the original because other targets rely on the location of the R.txt
+      # file.
+      _copy_rtxt_target = "${_template_name}__copy_rtxt"
+      copy(_copy_rtxt_target) {
+        deps = [ ":$_compile_resources_target" ]
+        sources = [ _compile_resources_rtxt_out ]
+        outputs = [ _final_rtxt_path ]
+      }
+      _final_deps += [ ":$_copy_rtxt_target" ]
+    }
+
+    if (defined(_resource_sizes_arsc_path)) {
+      _copy_arsc_target = "${_template_name}__copy_arsc"
+      copy(_copy_arsc_target) {
+        deps = [ ":$_compile_resources_target" ]
+
+        # resource_sizes.py doesn't care if it gets the optimized .arsc.
+        sources = [ _arsc_resources_path ]
+        outputs = [ _resource_sizes_arsc_path ]
+      }
+      _final_deps += [ ":$_copy_arsc_target" ]
+    }
+
+    _generate_native_libraries_java =
+        (!_is_bundle_module || _is_base_module) &&
+        (_native_libs_deps != [] || _secondary_abi_native_libs_deps != []) &&
+        !_uses_static_library_synchronized_proguard
+    if (_generate_native_libraries_java) {
+      write_native_libraries_java("${_template_name}__native_libraries") {
+        forward_variables_from(invoker, [ "main_component_library" ])
+
+        # Do not add a dep on the generated_file target in order to avoid having
+        # to build the native libraries before this target. The dependency is
+        # instead captured via a depfile.
+        if (_native_libs_deps != []) {
+          native_libraries_list_file = _shared_library_list_file
+        } else {
+          native_libraries_list_file = _secondary_abi_shared_library_list_file
+        }
+        enable_chromium_linker = _use_chromium_linker
+        load_library_from_apk = _load_library_from_apk
+        use_modern_linker = _use_modern_linker
+        use_final_fields = true
+      }
+      _srcjar_deps += [ ":${_template_name}__native_libraries" ]
+    }
+
+    _loadable_modules = []
+    if (defined(invoker.loadable_modules)) {
+      _loadable_modules = invoker.loadable_modules
+    }
+
+    if (_native_libs_deps != []) {
+      _loadable_modules += _sanitizer_runtimes
+    }
+
+    if (_generate_buildconfig_java) {
+      generate_build_config_srcjar("${_template_name}__build_config_srcjar") {
+        forward_variables_from(invoker,
+                               [
+                                 "min_sdk_version",
+                                 "isolated_splits_enabled",
+                               ])
+        _bundles_supported = _is_bundle_module || _is_static_library_provider
+        if (defined(invoker.bundles_supported)) {
+          _bundles_supported = invoker.bundles_supported
+        }
+        bundles_supported = _bundles_supported
+        use_final_fields = true
+        enable_multidex = _enable_multidex
+        is_incremental_install = _incremental_apk
+        if (defined(invoker.product_version_resources_dep)) {
+          resources_version_variable =
+              "org.chromium.base.R.string.product_version"
+        }
+        deps = [ ":$_build_config_target" ]
+      }
+      _srcjar_deps += [ ":${_template_name}__build_config_srcjar" ]
+    }
+
+    if (_generate_productconfig_java) {
+      foreach(_package, invoker.product_config_java_packages) {
+        _locale_target_name =
+            "${_template_name}_${_package}__product_config_srcjar"
+        generate_product_config_srcjar("$_locale_target_name") {
+          forward_variables_from(invoker, [ "is_bundle_module" ])
+          build_config = _build_config
+          java_package = _package
+          use_chromium_linker = _use_chromium_linker
+          use_modern_linker = _use_modern_linker
+          deps = [ ":$_build_config_target" ]
+        }
+        _srcjar_deps += [ ":$_locale_target_name" ]
+      }
+    }
+
+    if (_generate_final_jni) {
+      generate_jni_registration("${_template_name}__final_jni") {
+        forward_variables_from(invoker,
+                               [
+                                 "enable_native_mocks",
+                                 "require_native_mocks",
+                               ])
+        if (defined(invoker.bundle_target)) {
+          targets = [ invoker.bundle_target ]
+        } else {
+          targets = [ ":$_template_name" ]
+        }
+        if (_is_static_library_provider) {
+          foreach(_target, invoker.static_library_dependent_targets) {
+            targets += [ _target.name ]
+          }
+        }
+        if (defined(invoker.jni_registration_header)) {
+          header_output = invoker.jni_registration_header
+        }
+        if (defined(invoker.jni_sources_exclusions)) {
+          sources_exclusions = invoker.jni_sources_exclusions
+        }
+      }
+      _srcjar_deps += [ ":${_template_name}__final_jni" ]
+    } else {
+      not_needed(invoker,
+                 [
+                   "enable_native_mocks",
+                   "jni_registration_header",
+                 ])
+    }
+
+    _java_target = "${_template_name}__java"
+
+    java_library_impl(_java_target) {
+      forward_variables_from(invoker,
+                             [
+                               "alternative_android_sdk_dep",
+                               "android_manifest",
+                               "android_manifest_dep",
+                               "annotation_processor_deps",
+                               "apk_under_test",
+                               "base_module_target",
+                               "chromium_code",
+                               "jacoco_never_instrument",
+                               "jar_excluded_patterns",
+                               "javac_args",
+                               "native_lib_placeholders",
+                               "processor_args_javac",
+                               "secondary_abi_loadable_modules",
+                               "secondary_native_lib_placeholders",
+                               "sources",
+                               "static_library_dependent_targets",
+                               "use_classic_desugar",
+                               "library_always_compress",
+                               "library_renames",
+                             ])
+      deps = _deps
+      if (_uses_static_library_synchronized_proguard) {
+        if (!defined(jar_excluded_patterns)) {
+          jar_excluded_patterns = []
+        }
+
+        # The static library will provide all R.java files, but we still need to
+        # make the base module R.java files available at compile time since DFM
+        # R.java classes extend base module classes.
+        jar_excluded_patterns += [
+          "*/R.class",
+          "*/R\$*.class",
+        ]
+      }
+      if (_is_bundle_module) {
+        type = "android_app_bundle_module"
+        res_size_info_path = _res_size_info_path
+        is_base_module = _is_base_module
+        forward_variables_from(invoker,
+                               [
+                                 "version_code",
+                                 "version_name",
+                               ])
+      } else {
+        type = "android_apk"
+      }
+      r_text_path = _compile_resources_rtxt_out
+      main_target_name = _template_name
+      supports_android = true
+      requires_android = true
+      srcjar_deps = _srcjar_deps
+      merged_android_manifest = _android_manifest
+      if (defined(_final_dex_path)) {
+        final_dex_path = _final_dex_path
+      }
+
+      if (_is_bundle_module) {
+        proto_resources_path = _proto_resources_path
+        if (_optimize_resources) {
+          proto_resources_path = _optimized_proto_resources_path
+          if (_short_resource_paths) {
+            module_pathmap_path = _resources_path_map_out_path
+          }
+        }
+      } else {
+        apk_path = _final_apk_path
+        if (_incremental_apk) {
+          incremental_apk_path = _incremental_apk_path
+          incremental_install_json_path = _incremental_install_json_path
+        }
+      }
+
+      proguard_enabled = _proguard_enabled
+      if (_proguard_enabled) {
+        proguard_configs = [ _generated_proguard_config ]
+        if (defined(invoker.proguard_configs)) {
+          proguard_configs += invoker.proguard_configs
+        }
+        if (!enable_java_asserts && (!defined(testonly) || !testonly) &&
+            # Injected JaCoCo code causes -checkdiscards to fail.
+            !use_jacoco_coverage) {
+          proguard_configs += [ "//build/android/dcheck_is_off.flags" ]
+        }
+        if (!_is_bundle_module) {
+          proguard_mapping_path = _proguard_mapping_path
+        }
+      }
+
+      # Do not add a dep on the generated_file target in order to avoid having
+      # to build the native libraries before this target. The dependency is
+      # instead captured via a depfile.
+      if (_native_libs_deps != []) {
+        shared_libraries_runtime_deps_file = _shared_library_list_file
+      }
+      if (defined(_secondary_abi_shared_library_list_file)) {
+        secondary_abi_shared_libraries_runtime_deps_file =
+            _secondary_abi_shared_library_list_file
+      }
+
+      loadable_modules = _loadable_modules
+
+      uncompress_shared_libraries = _uncompress_shared_libraries
+
+      if (defined(_allowlist_r_txt_path) && _is_bundle_module) {
+        # Used to write the file path to the target's .build_config.json only.
+        base_allowlist_rtxt_path = _allowlist_r_txt_path
+      }
+    }
+
+    # TODO(cjhopman): This is only ever needed to calculate the list of tests to
+    # run. See build/android/pylib/instrumentation/test_jar.py. We should be
+    # able to just do that calculation at build time instead.
+    if (defined(invoker.dist_ijar_path)) {
+      _dist_ijar_path = invoker.dist_ijar_path
+      dist_jar("${_template_name}_dist_ijar") {
+        override_build_config = _build_config
+        output = _dist_ijar_path
+        data = [ _dist_ijar_path ]
+        use_interface_jars = true
+        deps = [
+          ":$_build_config_target",
+          ":$_java_target",
+        ]
+      }
+    }
+
+    if (_uses_static_library_synchronized_proguard) {
+      _final_dex_target_dep = "${invoker.static_library_provider}__dexsplitter"
+    } else if (_is_bundle_module && _proguard_enabled) {
+      _final_deps += [ ":$_java_target" ]
+    } else if (_incremental_apk) {
+      if (defined(invoker.enable_proguard_checks)) {
+        not_needed(invoker, [ "enable_proguard_checks" ])
+      }
+      if (defined(invoker.disable_r8_outlining)) {
+        not_needed(invoker, [ "disable_r8_outlining" ])
+      }
+      if (defined(invoker.dexlayout_profile)) {
+        not_needed(invoker, [ "dexlayout_profile" ])
+      }
+    } else {
+      # Dex generation for app bundle modules with proguarding enabled takes
+      # place later due to synchronized proguarding.
+      _final_dex_target_name = "${_template_name}__final_dex"
+      dex(_final_dex_target_name) {
+        forward_variables_from(invoker,
+                               [
+                                 "disable_r8_outlining",
+                                 "dexlayout_profile",
+                                 "enable_proguard_checks",
+                                 "proguard_enable_obfuscation",
+                               ])
+        min_sdk_version = _min_sdk_version
+        proguard_enabled = _proguard_enabled
+        build_config = _build_config
+        deps = [
+          ":$_build_config_target",
+          ":$_java_target",
+        ]
+        if (_proguard_enabled) {
+          deps += _deps + [ ":$_compile_resources_target" ]
+          proguard_mapping_path = _proguard_mapping_path
+          proguard_sourcefile_suffix = "$android_channel-$_version_code"
+          has_apk_under_test = defined(invoker.apk_under_test)
+        } else if (_min_sdk_version >= default_min_sdk_version) {
+          # Enable dex merging only when min_sdk_version is >= what the library
+          # .dex files were created with.
+          input_dex_filearg =
+              "@FileArg(${_rebased_build_config}:final_dex:all_dex_files)"
+        } else {
+          input_classes_filearg =
+              "@FileArg($_rebased_build_config:deps_info:device_classpath)"
+        }
+
+        if (_is_static_library_provider) {
+          # The list of input jars is already recorded in the .build_config.json, but
+          # we need to explicitly add the java deps here to ensure they're
+          # available to be used as inputs to the dex step.
+          foreach(_dep, invoker.static_library_dependent_targets) {
+            _target_label = get_label_info(_dep.name, "label_no_toolchain")
+            deps += [ "${_target_label}__java" ]
+          }
+          output = _static_library_sync_dex_path
+          is_static_library = true
+        } else {
+          output = _final_dex_path
+        }
+        enable_multidex = _enable_multidex
+
+        # The individual dependencies would have caught real missing deps in
+        # their respective dex steps. False positives that were suppressed at
+        # per-target dex steps are emitted here since this may use jar files
+        # rather than dex files.
+        ignore_desugar_missing_deps = true
+
+        if (_enable_main_dex_list) {
+          extra_main_dex_proguard_config = _generated_proguard_main_dex_config
+          deps += [ ":$_compile_resources_target" ]
+        }
+      }
+
+      _final_dex_target_dep = ":$_final_dex_target_name"
+
+      # For static libraries, a single Proguard run is performed that includes
+      # code from the static library APK and the APKs that use the static
+      # library (done via. classpath merging in write_build_config.py).
+      # This dexsplitter target splits the synchronized dex output into dex
+      # files for each APK/Bundle. In the Bundle case, another dexsplitter step
+      # is later performed to split the dex further for each feature module.
+      if (_is_static_library_provider && _proguard_enabled) {
+        _static_library_modules = []
+        foreach(_target, invoker.static_library_dependent_targets) {
+          _apk_as_module = _target.name
+          _module_config_target = "${_apk_as_module}$build_config_target_suffix"
+          _module_gen_dir = get_label_info(_apk_as_module, "target_gen_dir")
+          _module_name = get_label_info(_apk_as_module, "name")
+          _module_config = "$_module_gen_dir/$_module_name.build_config.json"
+          _static_library_modules += [
+            {
+              name = _module_name
+              build_config = _module_config
+              build_config_target = _module_config_target
+            },
+          ]
+        }
+
+        _static_library_dexsplitter_target = "${_template_name}__dexsplitter"
+        dexsplitter(_static_library_dexsplitter_target) {
+          input_dex_zip = _static_library_sync_dex_path
+          proguard_mapping = _proguard_mapping_path
+          deps = [
+            ":$_build_config_target",
+            "$_final_dex_target_dep",
+          ]
+          all_modules = [
+                          {
+                            name = "base"
+                            build_config = _build_config
+                            build_config_target = ":$_build_config_target"
+                          },
+                        ] + _static_library_modules
+          feature_jars_args = [
+            "--feature-jars",
+            "@FileArg($_rebased_build_config:deps_info:" +
+                "static_library_dependent_classpath_configs:" +
+                "$_rebased_build_config)",
+          ]
+          foreach(_module, _static_library_modules) {
+            _rebased_module_config =
+                rebase_path(_module.build_config, root_build_dir)
+            feature_jars_args += [
+              "--feature-jars",
+              "@FileArg($_rebased_build_config:deps_info:" +
+                  "static_library_dependent_classpath_configs:" +
+                  "$_rebased_module_config)",
+            ]
+          }
+        }
+        _final_deps += [ ":$_static_library_dexsplitter_target" ]
+        _validate_dex_target = "${_template_name}__validate_dex"
+        action_with_pydeps(_validate_dex_target) {
+          depfile = "$target_gen_dir/$target_name.d"
+          script =
+              "//build/android/gyp/validate_static_library_dex_references.py"
+          inputs = [ _build_config ]
+          _stamp = "$target_gen_dir/$target_name.stamp"
+          outputs = [ _stamp ]
+          deps = [
+            ":$_build_config_target",
+            ":$_static_library_dexsplitter_target",
+          ]
+          args = [
+            "--depfile",
+            rebase_path(depfile, root_build_dir),
+            "--stamp",
+            rebase_path(_stamp, root_build_dir),
+            "--static-library-dex",
+            "@FileArg($_rebased_build_config:final_dex:path)",
+          ]
+          foreach(_module, _static_library_modules) {
+            inputs += [ _module.build_config ]
+            _rebased_config = rebase_path(_module.build_config, root_build_dir)
+            deps += [ _module.build_config_target ]
+            args += [
+              "--static-library-dependent-dex",
+              "@FileArg($_rebased_config:final_dex:path)",
+            ]
+          }
+        }
+
+        # TODO(crbug.com/1032609): Switch to using R8's support for feature
+        # aware ProGuard and get rid of "_validate_dex_target" or figure out
+        # why some classes aren't properly being kept.
+        # _final_deps += [ ":$_validate_dex_target" ]
+        _final_dex_target_dep = ":$_static_library_dexsplitter_target"
+      }
+    }
+
+    _all_native_libs_deps = _native_libs_deps + _secondary_abi_native_libs_deps
+    if (_all_native_libs_deps != []) {
+      _native_libs_filearg_dep = ":$_build_config_target"
+      _all_native_libs_deps += [ _native_libs_filearg_dep ]
+
+      if (!_is_bundle_module) {
+        _native_libs_filearg =
+            "@FileArg($_rebased_build_config:native:libraries)"
+      }
+    }
+
+    if (_is_bundle_module) {
+      _final_deps += [
+                       ":$_merge_manifest_target",
+                       ":$_build_config_target",
+                       ":$_compile_resources_target",
+                     ] + _all_native_libs_deps
+      if (_optimize_resources) {
+        _final_deps += [ ":$_optimize_resources_target" ]
+      }
+      if (defined(_final_dex_target_dep)) {
+        not_needed([ "_final_dex_target_dep" ])
+      }
+    } else {
+      # Generate size-info/*.jar.info files.
+      if (defined(invoker.name)) {
+        # Create size info files for targets that care about size
+        # (have proguard enabled).
+        _include_size_info =
+            defined(invoker.include_size_info) && invoker.include_size_info
+        if (_include_size_info || _proguard_enabled) {
+          _size_info_target = "${target_name}__size_info"
+          create_size_info_files(_size_info_target) {
+            name = "${invoker.name}.apk"
+            build_config = _build_config
+            res_size_info_path = _res_size_info_path
+            deps = _deps + [
+                     ":$_build_config_target",
+                     ":$_compile_resources_target",
+                     ":$_java_target",
+                   ]
+          }
+          _final_deps += [ ":$_size_info_target" ]
+        } else {
+          not_needed(invoker, [ "name" ])
+        }
+      }
+
+      _keystore_path = android_keystore_path
+      _keystore_name = android_keystore_name
+      _keystore_password = android_keystore_password
+
+      if (defined(invoker.keystore_path)) {
+        _keystore_path = invoker.keystore_path
+        _keystore_name = invoker.keystore_name
+        _keystore_password = invoker.keystore_password
+      }
+
+      if (_incremental_apk) {
+        _incremental_compiled_resources_path = "${_base_path}_incremental.ap_"
+        _incremental_compile_resources_target_name =
+            "${target_name}__compile_incremental_resources"
+
+        action_with_pydeps(_incremental_compile_resources_target_name) {
+          deps = [
+            ":$_build_config_target",
+            ":$_compile_resources_target",
+            ":$_merge_manifest_target",
+          ]
+          script =
+              "//build/android/incremental_install/generate_android_manifest.py"
+          inputs = [
+            _android_manifest,
+            _build_config,
+            _arsc_resources_path,
+          ]
+          outputs = [ _incremental_compiled_resources_path ]
+
+          args = [
+            "--disable-isolated-processes",
+            "--src-manifest",
+            rebase_path(_android_manifest, root_build_dir),
+            "--in-apk",
+            rebase_path(_arsc_resources_path, root_build_dir),
+            "--out-apk",
+            rebase_path(_incremental_compiled_resources_path, root_build_dir),
+            "--aapt2-path",
+            rebase_path(android_sdk_tools_bundle_aapt2, root_build_dir),
+            "--android-sdk-jars=@FileArg($_rebased_build_config:android:sdk_jars)",
+          ]
+        }
+      }
+
+      _create_apk_target = "${_template_name}__create"
+      _final_deps += [ ":$_create_apk_target" ]
+      package_apk("$_create_apk_target") {
+        forward_variables_from(invoker,
+                               [
+                                 "expected_libs_and_assets",
+                                 "expected_libs_and_assets_base",
+                                 "native_lib_placeholders",
+                                 "secondary_abi_loadable_modules",
+                                 "secondary_native_lib_placeholders",
+                                 "uncompress_dex",
+                                 "uncompress_shared_libraries",
+                                 "library_always_compress",
+                                 "library_renames",
+                               ])
+
+        if (defined(expected_libs_and_assets)) {
+          build_config_dep = ":$_build_config_target"
+          top_target_name = _template_name
+        }
+
+        build_config = _build_config
+        keystore_name = _keystore_name
+        keystore_path = _keystore_path
+        keystore_password = _keystore_password
+        min_sdk_version = _min_sdk_version
+        uncompress_shared_libraries = _uncompress_shared_libraries
+
+        deps = _deps + [ ":$_build_config_target" ]
+
+        if ((!_proguard_enabled || _incremental_apk) &&
+            enable_jdk_library_desugaring) {
+          _all_jdk_libs = "//build/android:all_jdk_libs"
+          deps += [ _all_jdk_libs ]
+          jdk_libs_dex = get_label_info(_all_jdk_libs, "target_out_dir") +
+                         "/all_jdk_libs.l8.dex"
+        }
+
+        if (_incremental_apk) {
+          _dex_target = "//build/android/incremental_install:apk_dex"
+
+          deps += [
+            ":${_incremental_compile_resources_target_name}",
+            _dex_target,
+          ]
+
+          dex_path = get_label_info(_dex_target, "target_out_dir") + "/apk.dex"
+
+          # All native libraries are side-loaded, so use a placeholder to force
+          # the proper bitness for the app.
+          _has_native_libs =
+              defined(_native_libs_filearg) || _loadable_modules != []
+          if (_has_native_libs && !defined(native_lib_placeholders)) {
+            native_lib_placeholders = [ "libfix.crbug.384638.so" ]
+          }
+
+          packaged_resources_path = _incremental_compiled_resources_path
+          output_apk_path = _incremental_apk_path
+        } else {
+          loadable_modules = _loadable_modules
+          deps += _all_native_libs_deps + [
+                    ":$_merge_manifest_target",
+                    ":$_compile_resources_target",
+                  ]
+
+          if (defined(_final_dex_path)) {
+            dex_path = _final_dex_path
+            deps += [ _final_dex_target_dep ]
+          }
+
+          packaged_resources_path = _arsc_resources_path
+
+          if (defined(_native_libs_filearg)) {
+            native_libs_filearg = _native_libs_filearg
+            secondary_abi_native_libs_filearg = "@FileArg($_rebased_build_config:native:secondary_abi_libraries)"
+          }
+          output_apk_path = _final_apk_path
+        }
+      }
+    }
+
+    if (_incremental_apk) {
+      _write_installer_json_rule_name = "${_template_name}__incremental_json"
+      action_with_pydeps(_write_installer_json_rule_name) {
+        script = "//build/android/incremental_install/write_installer_json.py"
+        deps = [ ":$_build_config_target" ] + _all_native_libs_deps
+
+        data = [ _incremental_install_json_path ]
+        inputs = [ _build_config ]
+        outputs = [ _incremental_install_json_path ]
+
+        _rebased_incremental_apk_path =
+            rebase_path(_incremental_apk_path, root_build_dir)
+        _rebased_incremental_install_json_path =
+            rebase_path(_incremental_install_json_path, root_build_dir)
+        args = [
+          "--apk-path=$_rebased_incremental_apk_path",
+          "--output-path=$_rebased_incremental_install_json_path",
+          "--dex-file=@FileArg($_rebased_build_config:final_dex:all_dex_files)",
+        ]
+        if (_proguard_enabled) {
+          args += [ "--show-proguard-warning" ]
+        }
+        if (defined(_native_libs_filearg)) {
+          args += [ "--native-libs=$_native_libs_filearg" ]
+          deps += [ _native_libs_filearg_dep ]
+        }
+        if (_loadable_modules != []) {
+          _rebased_loadable_modules =
+              rebase_path(_loadable_modules, root_build_dir)
+          args += [ "--native-libs=$_rebased_loadable_modules" ]
+        }
+      }
+      _final_deps += [
+        ":$_java_target",
+        ":$_write_installer_json_rule_name",
+      ]
+    }
+
+    # Generate apk operation related script.
+    if (!_is_bundle_module &&
+        (!defined(invoker.create_apk_script) || invoker.create_apk_script)) {
+      if (_uses_static_library) {
+        _install_artifacts_target = "${target_name}__install_artifacts"
+        _install_artifacts_json =
+            "${target_gen_dir}/${target_name}.install_artifacts"
+        generated_file(_install_artifacts_target) {
+          output_conversion = "json"
+          deps = [ invoker.static_library_provider ]
+          outputs = [ _install_artifacts_json ]
+          data_keys = [ "install_artifacts" ]
+          rebase = root_build_dir
+        }
+      }
+      _apk_operations_target_name = "${target_name}__apk_operations"
+      action_with_pydeps(_apk_operations_target_name) {
+        _generated_script = "$root_build_dir/bin/${invoker.target_name}"
+        script = "//build/android/gyp/create_apk_operations_script.py"
+        outputs = [ _generated_script ]
+        args = [
+          "--script-output-path",
+          rebase_path(_generated_script, root_build_dir),
+          "--target-cpu=$target_cpu",
+        ]
+        if (defined(invoker.command_line_flags_file)) {
+          args += [
+            "--command-line-flags-file",
+            invoker.command_line_flags_file,
+          ]
+        }
+        if (_incremental_apk) {
+          args += [
+            "--incremental-install-json-path",
+            rebase_path(_incremental_install_json_path, root_build_dir),
+          ]
+        } else {
+          args += [
+            "--apk-path",
+            rebase_path(_final_apk_path, root_build_dir),
+          ]
+        }
+        if (_uses_static_library) {
+          deps = [ ":$_install_artifacts_target" ]
+          _rebased_install_artifacts_json =
+              rebase_path(_install_artifacts_json, root_build_dir)
+          _static_library_apk_path =
+              "@FileArg($_rebased_install_artifacts_json[])"
+          args += [
+            "--additional-apk",
+            _static_library_apk_path,
+          ]
+        }
+        data = []
+        data_deps = [
+          "//build/android:apk_operations_py",
+          "//build/android:stack_tools",
+        ]
+
+        if (_proguard_enabled && !_incremental_apk) {
+          # Required by logcat command.
+          data_deps += [ "//build/android/stacktrace:java_deobfuscate" ]
+          data += [ "$_final_apk_path.mapping" ]
+          args += [
+            "--proguard-mapping-path",
+            rebase_path("$_final_apk_path.mapping", root_build_dir),
+          ]
+        }
+      }
+      _final_deps += [ ":$_apk_operations_target_name" ]
+    }
+
+    _enable_lint = defined(invoker.enable_lint) && invoker.enable_lint &&
+                   !disable_android_lint
+    if (_enable_lint) {
+      android_lint("${target_name}__lint") {
+        forward_variables_from(invoker,
+                               [
+                                 "lint_baseline_file",
+                                 "lint_suppressions_file",
+                                 "min_sdk_version",
+                               ])
+        build_config = _build_config
+        build_config_dep = ":$_build_config_target"
+        deps = [ ":$_java_target" ]
+        if (defined(invoker.lint_suppressions_dep)) {
+          deps += [ invoker.lint_suppressions_dep ]
+        }
+        if (defined(invoker.lint_min_sdk_version)) {
+          min_sdk_version = invoker.lint_min_sdk_version
+        }
+      }
+    } else {
+      not_needed(invoker,
+                 [
+                   "lint_baseline_file",
+                   "lint_min_sdk_version",
+                   "lint_suppressions_dep",
+                   "lint_suppressions_file",
+                 ])
+    }
+
+    group(target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "assert_no_deps",
+                               "data",
+                               "data_deps",
+                               "metadata",
+                             ])
+
+      # Generate apk related operations at runtime.
+      public_deps = _final_deps
+
+      if (!defined(data_deps)) {
+        data_deps = []
+      }
+
+      # Include unstripped native libraries so tests can symbolize stacks.
+      data_deps += _all_native_libs_deps
+
+      if (_enable_lint) {
+        data_deps += [ ":${target_name}__lint" ]
+      }
+
+      if (_uses_static_library) {
+        data_deps += [ invoker.static_library_provider ]
+      }
+    }
+  }
+
+  # Declare an Android APK target
+  #
+  # This target creates an Android APK containing java code, resources, assets,
+  # and (possibly) native libraries.
+  #
+  # Supports all variables of android_apk_or_module(), plus:
+  #   apk_name: Name for final apk.
+  #   final_apk_path: (Optional) path to output APK.
+  #
+  # Example
+  #   android_apk("foo_apk") {
+  #     android_manifest = "AndroidManifest.xml"
+  #     sources = [
+  #       "android/org/chromium/foo/FooApplication.java",
+  #       "android/org/chromium/foo/FooActivity.java",
+  #     ]
+  #     deps = [
+  #       ":foo_support_java"
+  #       ":foo_resources"
+  #     ]
+  #     srcjar_deps = [
+  #       ":foo_generated_enum"
+  #     ]
+  #     shared_libraries = [
+  #       ":my_shared_lib",
+  #     ]
+  #   }
+  template("android_apk") {
+    # TODO(crbug.com/1042017): Remove.
+    not_needed(invoker, [ "no_build_hooks" ])
+    android_apk_or_module(target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "aapt_locale_allowlist",
+                               "additional_jar_files",
+                               "alternative_android_sdk_dep",
+                               "android_manifest",
+                               "android_manifest_dep",
+                               "annotation_processor_deps",
+                               "apk_under_test",
+                               "app_as_shared_lib",
+                               "assert_no_deps",
+                               "bundles_supported",
+                               "chromium_code",
+                               "command_line_flags_file",
+                               "create_apk_script",
+                               "data",
+                               "data_deps",
+                               "deps",
+                               "dexlayout_profile",
+                               "disable_r8_outlining",
+                               "dist_ijar_path",
+                               "enable_lint",
+                               "enable_multidex",
+                               "enable_native_mocks",
+                               "enable_proguard_checks",
+                               "enforce_resource_overlays_in_tests",
+                               "expected_android_manifest",
+                               "expected_android_manifest_base",
+                               "expected_libs_and_assets",
+                               "expected_libs_and_assets_base",
+                               "generate_buildconfig_java",
+                               "generate_final_jni",
+                               "include_size_info",
+                               "input_jars_paths",
+                               "use_modern_linker",
+                               "jacoco_never_instrument",
+                               "javac_args",
+                               "jni_registration_header",
+                               "jni_sources_exclusions",
+                               "keystore_name",
+                               "keystore_password",
+                               "keystore_path",
+                               "lint_baseline_file",
+                               "lint_min_sdk_version",
+                               "lint_suppressions_dep",
+                               "lint_suppressions_file",
+                               "load_library_from_apk",
+                               "loadable_modules",
+                               "manifest_package",
+                               "max_sdk_version",
+                               "product_config_java_packages",
+                               "main_component_library",
+                               "min_sdk_version",
+                               "native_lib_placeholders",
+                               "never_incremental",
+                               "no_xml_namespaces",
+                               "png_to_webp",
+                               "post_process_package_resources_script",
+                               "processor_args_javac",
+                               "product_version_resources_dep",
+                               "proguard_configs",
+                               "proguard_enabled",
+                               "proguard_enable_obfuscation",
+                               "r_java_root_package_name",
+                               "resource_exclusion_exceptions",
+                               "resource_exclusion_regex",
+                               "resource_ids_provider_dep",
+                               "resource_values_filter_rules",
+                               "require_native_mocks",
+                               "secondary_abi_loadable_modules",
+                               "secondary_abi_shared_libraries",
+                               "secondary_native_lib_placeholders",
+                               "shared_libraries",
+                               "shared_resources",
+                               "shared_resources_allowlist_locales",
+                               "shared_resources_allowlist_target",
+                               "sources",
+                               "srcjar_deps",
+                               "static_library_dependent_targets",
+                               "static_library_provider",
+                               "static_library_synchronized_proguard",
+                               "target_sdk_version",
+                               "testonly",
+                               "uncompress_dex",
+                               "uncompress_shared_libraries",
+                               "use_classic_desugar",
+                               "library_always_compress",
+                               "library_renames",
+                               "use_chromium_linker",
+                               "version_code",
+                               "version_name",
+                               "visibility",
+                             ])
+      is_bundle_module = false
+      name = invoker.apk_name
+      if (defined(invoker.final_apk_path)) {
+        final_apk_path = invoker.final_apk_path
+      } else {
+        final_apk_path = "$root_build_dir/apks/${invoker.apk_name}.apk"
+      }
+      metadata = {
+        install_artifacts = [ final_apk_path ]
+      }
+      if (defined(invoker.static_library_provider)) {
+        metadata.install_artifacts_barrier = []
+      }
+    }
+  }
+
+  # Declare an Android app bundle module target.
+  #
+  # The module can be used for an android_apk_or_module().
+  #
+  # Supports all variables of android_library(), plus:
+  #   module_name: Name of the module.
+  #   is_base_module: If defined and true, indicates that this is the bundle's
+  #     base module (optional).
+  #   base_module_target: Base module target of the bundle this module will be
+  #     added to (optional). Can only be specified for non-base modules.
+  #   bundle_target: Bundle target that this module belongs to (optional).
+  #     Can only be specified for base modules.
+  template("android_app_bundle_module") {
+    _is_base_module = defined(invoker.is_base_module) && invoker.is_base_module
+
+    if (_is_base_module) {
+      assert(!defined(invoker.base_module_target))
+    } else {
+      assert(!defined(invoker.app_as_shared_lib))
+      assert(!defined(invoker.shared_resources))
+      assert(!defined(invoker.shared_resources_allowlist_target))
+      assert(!defined(invoker.shared_resources_allowlist_locales))
+      assert(defined(invoker.base_module_target))
+      assert(!defined(invoker.bundle_target))
+    }
+
+    # TODO(tiborg): We have several flags that are necessary for workarounds
+    # that come from the fact that the resources get compiled in the bundle
+    # module target, but bundle modules have to have certain flags in
+    # common or bundle modules have to know information about the base module.
+    # Those flags include version_code, version_name, and base_module_target.
+    # It would be better to move the resource compile target into the bundle
+    # target. Doing so would keep the bundle modules independent from the bundle
+    # and potentially reuse the same bundle modules for multiple bundles.
+    android_apk_or_module(target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "aapt_locale_allowlist",
+                               "additional_jar_files",
+                               "alternative_android_sdk_dep",
+                               "android_manifest",
+                               "android_manifest_dep",
+                               "annotation_processor_deps",
+                               "app_as_shared_lib",
+                               "assert_no_deps",
+                               "base_module_target",
+                               "bundle_target",
+                               "chromium_code",
+                               "data",
+                               "data_deps",
+                               "deps",
+                               "enable_multidex",
+                               "expected_android_manifest",
+                               "expected_android_manifest_base",
+                               "extra_verification_manifest",
+                               "extra_verification_manifest_dep",
+                               "generate_buildconfig_java",
+                               "generate_final_jni",
+                               "input_jars_paths",
+                               "isolated_splits_enabled",
+                               "is_base_module",
+                               "jacoco_never_instrument",
+                               "jar_excluded_patterns",
+                               "javac_args",
+                               "jni_registration_header",
+                               "jni_sources_exclusions",
+                               "load_library_from_apk",
+                               "loadable_modules",
+                               "product_config_java_packages",
+                               "manifest_package",
+                               "max_sdk_version",
+                               "min_sdk_version",
+                               "native_lib_placeholders",
+                               "no_xml_namespaces",
+                               "package_id",
+                               "package_name",
+                               "png_to_webp",
+                               "processor_args_javac",
+                               "product_version_resources_dep",
+                               "proguard_configs",
+                               "proguard_enabled",
+                               "proguard_enable_obfuscation",
+                               "resource_exclusion_exceptions",
+                               "resource_exclusion_regex",
+                               "resource_ids_provider_dep",
+                               "resource_values_filter_rules",
+                               "resources_config_paths",
+                               "secondary_abi_loadable_modules",
+                               "secondary_abi_shared_libraries",
+                               "secondary_native_lib_placeholders",
+                               "shared_libraries",
+                               "shared_resources",
+                               "shared_resources_allowlist_locales",
+                               "shared_resources_allowlist_target",
+                               "short_resource_paths",
+                               "srcjar_deps",
+                               "static_library_provider",
+                               "static_library_synchronized_proguard",
+                               "strip_resource_names",
+                               "strip_unused_resources",
+                               "target_sdk_version",
+                               "testonly",
+                               "uncompress_shared_libraries",
+                               "library_always_compress",
+                               "library_renames",
+                               "use_chromium_linker",
+                               "use_modern_linker",
+                               "uses_split",
+                               "version_code",
+                               "version_name",
+                               "visibility",
+                             ])
+      is_bundle_module = true
+      generate_buildconfig_java = _is_base_module
+    }
+  }
+
+  # Declare an Android instrumentation test runner.
+  #
+  # This target creates a wrapper script to run Android instrumentation tests.
+  #
+  # Arguments:
+  #   android_test_apk: The target containing the tests.
+  #   android_test_apk_name: The apk_name in android_test_apk
+  #
+  #   The following args are optional:
+  #   apk_under_test: The target being tested.
+  #   additional_apks: Additional targets to install on device.
+  #   data: List of runtime data file dependencies.
+  #   data_deps: List of non-linked dependencies.
+  #   deps: List of private dependencies.
+  #   extra_args: Extra arguments set for test runner.
+  #   ignore_all_data_deps: Don't build data_deps and additional_apks.
+  #   modules: Extra dynamic feature modules to install for test target. Can
+  #     only be used if |apk_under_test| is an Android app bundle.
+  #   fake_modules: Similar to |modules| but fake installed instead.
+  #   never_incremental: Disable incremental builds.
+  #   proguard_enabled: Enable proguard
+  #   public_deps: List of public dependencies
+  #
+  # Example
+  #   instrumentation_test_runner("foo_test_for_bar") {
+  #     android_test_apk: ":foo"
+  #     android_test_apk_name: "Foo"
+  #     apk_under_test: ":bar"
+  #   }
+  template("instrumentation_test_runner") {
+    if (use_rts) {
+      action("${invoker.target_name}__rts_filters") {
+        script = "//build/add_rts_filters.py"
+        rts_file = "${root_build_dir}/gen/rts/${invoker.target_name}.filter"
+        args = [ rebase_path(rts_file, root_build_dir) ]
+        outputs = [ rts_file ]
+      }
+    }
+    test_runner_script(target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "additional_apks",
+                               "additional_locales",
+                               "apk_under_test",
+                               "data",
+                               "data_deps",
+                               "deps",
+                               "extra_args",
+                               "fake_modules",
+                               "ignore_all_data_deps",
+                               "modules",
+                               "proguard_enabled",
+                               "public_deps",
+                               "use_webview_provider",
+                             ])
+      test_name = invoker.target_name
+      test_type = "instrumentation"
+      _apk_target_name = get_label_info(invoker.android_test_apk, "name")
+      apk_target = ":$_apk_target_name"
+      test_jar = "$root_build_dir/test.lib.java/" +
+                 invoker.android_test_apk_name + ".jar"
+      incremental_apk = !(defined(invoker.never_incremental) &&
+                          invoker.never_incremental) && incremental_install
+
+      public_deps = [
+        ":$_apk_target_name",
+
+        # Required by test runner to enumerate test list.
+        ":${_apk_target_name}_dist_ijar",
+      ]
+      if (defined(invoker.apk_under_test)) {
+        public_deps += [ invoker.apk_under_test ]
+      }
+      if (defined(invoker.additional_apks)) {
+        public_deps += invoker.additional_apks
+      }
+      if (use_rts) {
+        if (!defined(data_deps)) {
+          data_deps = []
+        }
+        data_deps += [ ":${invoker.target_name}__rts_filters" ]
+      }
+    }
+  }
+
+  # Declare an Android instrumentation test apk
+  #
+  # This target creates an Android instrumentation test apk.
+  #
+  # Supports all variables of android_apk(), plus:
+  #   apk_under_test: The apk being tested (optional).
+  #
+  # Example
+  #   android_test_apk("foo_test_apk") {
+  #     android_manifest = "AndroidManifest.xml"
+  #     apk_name = "FooTest"
+  #     apk_under_test = "Foo"
+  #     sources = [
+  #       "android/org/chromium/foo/FooTestCase.java",
+  #       "android/org/chromium/foo/FooExampleTest.java",
+  #     ]
+  #     deps = [
+  #       ":foo_test_support_java"
+  #     ]
+  #   }
+  template("android_test_apk") {
+    android_apk(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+      testonly = true
+
+      # The size info enables the test_runner to find the source file location
+      # of a test after it is ran.
+      include_size_info = true
+      data = [ "$root_build_dir/size-info/${invoker.apk_name}.apk.jar.info" ]
+      if (defined(invoker.data)) {
+        data += invoker.data
+      }
+
+      deps = [ "//testing/android/broker:broker_java" ]
+      if (defined(invoker.deps)) {
+        deps += invoker.deps
+      }
+      data_deps = [
+        # Ensure unstripped libraries are included in runtime deps so that
+        # symbolization can be done.
+        ":${target_name}__secondary_abi_shared_library_list",
+        ":${target_name}__shared_library_list",
+      ]
+      if (defined(invoker.data_deps)) {
+        data_deps += invoker.data_deps
+      }
+      if (defined(invoker.apk_under_test)) {
+        data_deps += [ invoker.apk_under_test ]
+      } else {
+        enable_native_mocks = true
+      }
+
+      if (defined(invoker.apk_under_test)) {
+        _under_test_label =
+            get_label_info(invoker.apk_under_test, "label_no_toolchain")
+        data_deps += [
+          "${_under_test_label}__secondary_abi_shared_library_list",
+          "${_under_test_label}__shared_library_list",
+        ]
+      }
+
+      if (defined(invoker.additional_apks)) {
+        data_deps += invoker.additional_apks
+      }
+      if (defined(invoker.use_webview_provider)) {
+        data_deps += [ invoker.use_webview_provider ]
+      }
+
+      if (defined(invoker.proguard_enabled) && invoker.proguard_enabled &&
+          !incremental_install) {
+        # When ProGuard is on, we use ProGuard to combine the under test java
+        # code and the test java code. This is to allow us to apply all ProGuard
+        # optimizations that we ship with, but not have them break tests. The
+        # apk under test will still have the same resources, assets, and
+        # manifest, all of which are the ones used in the tests.
+        proguard_configs = [ "//testing/android/proguard_for_test.flags" ]
+        if (defined(invoker.proguard_configs)) {
+          proguard_configs += invoker.proguard_configs
+        }
+        enable_proguard_checks = false
+        if (defined(invoker.final_apk_path)) {
+          _final_apk_path = final_apk_path
+        } else {
+          _final_apk_path = "$root_build_dir/apks/${invoker.apk_name}.apk"
+        }
+        data += [ "$_final_apk_path.mapping" ]
+      }
+
+      dist_ijar_path = "$root_build_dir/test.lib.java/${invoker.apk_name}.jar"
+      create_apk_script = false
+
+      forward_variables_from(invoker,
+                             "*",
+                             TESTONLY_AND_VISIBILITY + [
+                                   "data",
+                                   "data_deps",
+                                   "deps",
+                                   "proguard_configs",
+                                 ])
+    }
+  }
+
+  # Declare an Android instrumentation test apk with wrapper script.
+  #
+  # This target creates an Android instrumentation test apk with wrapper script
+  # to run the test.
+  #
+  # Supports all variables of android_test_apk.
+  template("instrumentation_test_apk") {
+    assert(defined(invoker.apk_name))
+    _apk_target_name = "${target_name}__test_apk"
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    android_test_apk(_apk_target_name) {
+      forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+    }
+    instrumentation_test_runner(target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "additional_apks",
+                               "apk_under_test",
+                               "data",
+                               "data_deps",
+                               "deps",
+                               "extra_args",
+                               "ignore_all_data_deps",
+                               "modules",
+                               "never_incremental",
+                               "proguard_enabled",
+                               "proguard_enable_obfuscation",
+                               "public_deps",
+                               "use_webview_provider",
+                             ])
+      android_test_apk = ":${_apk_target_name}"
+      android_test_apk_name = invoker.apk_name
+    }
+  }
+
+  # Declare an Android gtest apk
+  #
+  # This target creates an Android apk for running gtest-based unittests.
+  #
+  # Variables
+  #   deps: Specifies the dependencies of this target. These will be passed to
+  #     the underlying android_apk invocation and should include the java and
+  #     resource dependencies of the apk.
+  #   shared_library: shared_library target that contains the unit tests.
+  #   apk_name: The name of the produced apk. If unspecified, it uses the name
+  #             of the shared_library target suffixed with "_apk".
+  #   use_default_launcher: Whether the default activity (NativeUnitTestActivity)
+  #     should be used for launching tests.
+  #   allow_cleartext_traffic: (Optional) Whether to allow cleartext network
+  #     requests during the test.
+  #   use_native_activity: Test implements ANativeActivity_onCreate().
+  #
+  # Example
+  #   unittest_apk("foo_unittests_apk") {
+  #     deps = [ ":foo_java", ":foo_resources" ]
+  #     shared_library = ":foo_unittests"
+  #   }
+  template("unittest_apk") {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    _use_native_activity =
+        defined(invoker.use_native_activity) && invoker.use_native_activity
+    _android_manifest = "$target_gen_dir/$target_name/AndroidManifest.xml"
+    assert(invoker.shared_library != "")
+
+    # This trivial assert is needed in case android_manifest is defined,
+    # as otherwise _use_native_activity and _android_manifest would not be used.
+    assert(_use_native_activity != "" && _android_manifest != "")
+
+    if (!defined(invoker.android_manifest)) {
+      _allow_cleartext_traffic = defined(invoker.allow_cleartext_traffic) &&
+                                 invoker.allow_cleartext_traffic
+      jinja_template("${target_name}_manifest") {
+        _native_library_name = get_label_info(invoker.shared_library, "name")
+        if (defined(invoker.android_manifest_template)) {
+          input = invoker.android_manifest_template
+        } else {
+          input =
+              "//testing/android/native_test/java/AndroidManifest.xml.jinja2"
+        }
+        output = _android_manifest
+        variables = [
+          "is_component_build=${is_component_build}",
+          "native_library_name=${_native_library_name}",
+          "use_native_activity=${_use_native_activity}",
+          "allow_cleartext_traffic=${_allow_cleartext_traffic}",
+        ]
+      }
+    }
+
+    android_apk(target_name) {
+      data_deps = []
+      forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+      testonly = true
+      create_apk_script = false
+      enable_native_mocks = true
+
+      # TODO(crbug.com/1099849): Figure out why angle tests fail to launch
+      #     with newer target_sdk_version.
+      if (!defined(invoker.target_sdk_version) && _use_native_activity) {
+        target_sdk_version = 24
+      }
+
+      assert(!defined(invoker.proguard_enabled) || !invoker.proguard_enabled ||
+             invoker.proguard_configs != [])
+
+      if (!defined(apk_name)) {
+        apk_name = get_label_info(invoker.shared_library, "name")
+      }
+
+      if (!defined(android_manifest)) {
+        android_manifest_dep = ":${target_name}_manifest"
+        android_manifest = _android_manifest
+      }
+
+      final_apk_path = "$root_build_dir/${apk_name}_apk/${apk_name}-debug.apk"
+
+      if (!defined(use_default_launcher) || use_default_launcher) {
+        deps += [
+          "//base:base_java",
+          "//build/android/gtest_apk:native_test_instrumentation_test_runner_java",
+          "//testing/android/native_test:native_test_java",
+        ]
+      }
+      shared_libraries = [ invoker.shared_library ]
+      deps += [
+        ":${target_name}__secondary_abi_shared_library_list",
+        ":${target_name}__shared_library_list",
+      ]
+    }
+  }
+
+  # Generate .java files from .aidl files.
+  #
+  # This target will store the .java files in a srcjar and should be included in
+  # an android_library or android_apk's srcjar_deps.
+  #
+  # Variables
+  #   sources: Paths to .aidl files to compile.
+  #   import_include: Path to directory containing .java files imported by the
+  #     .aidl files.
+  #   interface_file: Preprocessed aidl file to import.
+  #
+  # Example
+  #   android_aidl("foo_aidl") {
+  #     import_include = "java/src"
+  #     sources = [
+  #       "java/src/com/foo/bar/FooBarService.aidl",
+  #       "java/src/com/foo/bar/FooBarServiceCallback.aidl",
+  #     ]
+  #   }
+  template("android_aidl") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+      script = "//build/android/gyp/aidl.py"
+      depfile = "$target_gen_dir/$target_name.d"
+      sources = invoker.sources
+
+      _srcjar_path = "${target_gen_dir}/${target_name}.srcjar"
+      _aidl_path = "${android_sdk_build_tools}/aidl"
+      _framework_aidl = "$android_sdk/framework.aidl"
+      _imports = [ _framework_aidl ]
+      if (defined(invoker.interface_file)) {
+        assert(invoker.interface_file != "")
+        _imports += [ invoker.interface_file ]
+      }
+
+      inputs = [ _aidl_path ] + _imports
+
+      outputs = [ _srcjar_path ]
+      _rebased_imports = rebase_path(_imports, root_build_dir)
+      args = [
+        "--aidl-path",
+        rebase_path(_aidl_path, root_build_dir),
+        "--imports=$_rebased_imports",
+        "--srcjar",
+        rebase_path(_srcjar_path, root_build_dir),
+        "--depfile",
+        rebase_path(depfile, root_build_dir),
+      ]
+      if (defined(invoker.import_include) && invoker.import_include != []) {
+        _rebased_import_paths = []
+        foreach(_import_path, invoker.import_include) {
+          _rebased_import_path = []
+          _rebased_import_path = [ rebase_path(_import_path, root_build_dir) ]
+          _rebased_import_paths += _rebased_import_path
+        }
+        args += [ "--includes=$_rebased_import_paths" ]
+      }
+      args += rebase_path(sources, root_build_dir)
+    }
+  }
+
+  # Compile a protocol buffer to java.
+  #
+  # This generates java files from protocol buffers and creates an Android library
+  # containing the classes.
+  #
+  # Variables
+  #   sources (required)
+  #       Paths to .proto files to compile.
+  #
+  #   proto_path (required)
+  #       Root directory of .proto files.
+  #
+  #   deps (optional)
+  #       Additional dependencies. Passed through to both the action and the
+  #       android_library targets.
+  #
+  #   import_dirs (optional)
+  #       A list of extra import directories to be passed to protoc compiler.
+  #       WARNING: This circumvents proto checkdeps, and should only be used
+  #       when needed, typically when proto files cannot cleanly import through
+  #       absolute paths, such as for third_party or generated .proto files.
+  #       http://crbug.com/691451 tracks fixing this.
+  #
+  # Example:
+  #  proto_java_library("foo_proto_java") {
+  #    proto_path = "src/foo"
+  #    sources = [ "$proto_path/foo.proto" ]
+  #  }
+  template("proto_java_library") {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+    _template_name = target_name
+
+    action_with_pydeps("${_template_name}__protoc_java") {
+      # The suffix "__protoc_java.srcjar" is used by SuperSize to identify
+      # protobuf symbols.
+      _srcjar_path = "$target_gen_dir/$target_name.srcjar"
+      script = "//build/protoc_java.py"
+
+      deps = []
+      if (defined(invoker.deps)) {
+        deps += invoker.deps
+      }
+
+      sources = invoker.sources
+      depfile = "$target_gen_dir/$target_name.d"
+      outputs = [ _srcjar_path ]
+      args = [
+               "--depfile",
+               rebase_path(depfile, root_build_dir),
+               "--protoc",
+               rebase_path(android_protoc_bin, root_build_dir),
+               "--proto-path",
+               rebase_path(invoker.proto_path, root_build_dir),
+               "--srcjar",
+               rebase_path(_srcjar_path, root_build_dir),
+             ] + rebase_path(sources, root_build_dir)
+
+      if (defined(invoker.import_dirs)) {
+        foreach(_import_dir, invoker.import_dirs) {
+          args += [
+            "--import-dir",
+            rebase_path(_import_dir, root_build_dir),
+          ]
+        }
+      }
+    }
+
+    android_library(target_name) {
+      chromium_code = false
+      sources = []
+      srcjar_deps = [ ":${_template_name}__protoc_java" ]
+      deps = [ "//third_party/android_deps:protobuf_lite_runtime_java" ]
+      if (defined(invoker.deps)) {
+        deps += invoker.deps
+      }
+    }
+  }
+
+  # Declare an Android library target for a prebuilt AAR.
+  #
+  # This target creates an Android library containing java code and Android
+  # resources. For libraries without resources, it will not generate
+  # corresponding android_resources targets.
+  #
+  # To avoid slowing down "gn gen", an associated .info file must be committed
+  # along with the .aar file. In order to create this file, define the target
+  # and then run once with the gn arg "update_android_aar_prebuilts = true".
+  #
+  # Variables
+  #   aar_path: Path to the AAR.
+  #   info_path: Path to the .aar.info file (generated via
+  #       update_android_aar_prebuilts GN arg).
+  #   proguard_configs: List of proguard configs to use in final apk step for
+  #       any apk that depends on this library.
+  #   ignore_aidl: Whether to ignore .aidl files found with the .aar.
+  #   ignore_assets: Whether to ignore assets found in the .aar.
+  #   ignore_manifest: Whether to ignore creating manifest.
+  #   ignore_native_libraries: Whether to ignore .so files found in the .aar.
+  #       See also extract_native_libraries.
+  #   ignore_proguard_configs: Whether to ignore proguard configs.
+  #   ignore_info_updates: Whether to ignore the info file when
+  #       update_android_aar_prebuilts gn arg is true. However, the info file
+  #       will still be verified regardless of the value of this flag.
+  #   strip_resources: Whether to ignore android resources found in the .aar.
+  #   custom_package: Java package for generated R.java files.
+  #   extract_native_libraries: Whether to extract .so files found in the .aar.
+  #       If the file contains .so, either extract_native_libraries or
+  #       ignore_native_libraries must be set.
+  #   TODO(jbudorick@): remove this arguments after crbug.com/522043 is fixed.
+  #   requires_android: Whether this target can only be used for compiling
+  #       Android related targets.
+  #
+  # Example
+  #   android_aar_prebuilt("foo_java") {
+  #     aar_path = "foo.aar"
+  #   }
+  template("android_aar_prebuilt") {
+    _info_path = "$target_name.info"
+    if (defined(invoker.info_path)) {
+      _info_path = invoker.info_path
+    }
+    _output_path = "${target_out_dir}/${target_name}"
+
+    # Some targets only differ by _java with other targets so _java and _junit
+    # need to be replaced by non-empty strings to avoid duplicate targets. (e.g.
+    # androidx_window_window_java vs androidx_window_window_java_java).
+    _target_name_without_java_or_junit =
+        string_replace(string_replace(target_name, "_java", "_J"),
+                       "_junit",
+                       "_U")
+
+    # This unpack target is a python action, not a valid java target. Since the
+    # java targets below depend on it, its name must not match the java patterns
+    # in internal_rules.gni.
+    _unpack_target_name = "${_target_name_without_java_or_junit}__unpack_aar"
+    _ignore_aidl = defined(invoker.ignore_aidl) && invoker.ignore_aidl
+    _ignore_assets = defined(invoker.ignore_assets) && invoker.ignore_assets
+    _ignore_manifest =
+        defined(invoker.ignore_manifest) && invoker.ignore_manifest
+    _ignore_native_libraries = defined(invoker.ignore_native_libraries) &&
+                               invoker.ignore_native_libraries
+    _ignore_proguard_configs = defined(invoker.ignore_proguard_configs) &&
+                               invoker.ignore_proguard_configs
+    _extract_native_libraries = defined(invoker.extract_native_libraries) &&
+                                invoker.extract_native_libraries
+    _strip_resources =
+        defined(invoker.strip_resources) && invoker.strip_resources
+
+    # Allow 'resource_overlay' parameter even if there are no resources in order
+    # to keep the logic for generated 'android_aar_prebuilt' rules simple.
+    not_needed(invoker, [ "resource_overlay" ])
+
+    _ignore_info_updates =
+        defined(invoker.ignore_info_updates) && invoker.ignore_info_updates
+
+    # Scan the AAR file and determine the resources and jar files.
+    # Some libraries might not have resources; others might have two jars.
+    if (!_ignore_info_updates && update_android_aar_prebuilts) {
+      print("Writing " + rebase_path(_info_path, "//"))
+      exec_script("//build/android/gyp/aar.py",
+                  [
+                    "list",
+                    rebase_path(invoker.aar_path, root_build_dir),
+                    "--output",
+                    rebase_path(_info_path, root_build_dir),
+                  ])
+    }
+
+    # If "gn gen" is failing on the following line, you need to generate an
+    # .info file for your new target by running:
+    #   gn gen --args='target_os="android" update_android_aar_prebuilts=true' out/tmp
+    #   rm -r out/tmp
+    _scanned_files = read_file(_info_path, "scope")
+
+    _use_scanned_assets = !_ignore_assets && _scanned_files.assets != []
+
+    assert(_ignore_aidl || _scanned_files.aidl == [],
+           "android_aar_prebuilt() aidl not yet supported." +
+               " Implement or use ignore_aidl = true." +
+               " http://crbug.com/644439")
+    assert(
+        !_scanned_files.has_native_libraries ||
+            (_ignore_native_libraries || _extract_native_libraries),
+        "android_aar_prebuilt() contains .so files." +
+            " Please set ignore_native_libraries or extract_native_libraries.")
+    assert(
+        !(_ignore_native_libraries && _extract_native_libraries),
+        "ignore_native_libraries and extract_native_libraries cannot both be set.")
+    assert(!_scanned_files.has_native_libraries ||
+           _scanned_files.native_libraries != [])
+    assert(_scanned_files.has_classes_jar || _scanned_files.subjars == [])
+
+    action_with_pydeps(_unpack_target_name) {
+      script = "//build/android/gyp/aar.py"  # Unzips the AAR
+      args = [
+        "extract",
+        rebase_path(invoker.aar_path, root_build_dir),
+        "--output-dir",
+        rebase_path(_output_path, root_build_dir),
+        "--assert-info-file",
+        rebase_path(_info_path, root_build_dir),
+      ]
+      if (_strip_resources) {
+        args += [ "--ignore-resources" ]
+      }
+      inputs = [ invoker.aar_path ]
+      outputs = [ "${_output_path}/AndroidManifest.xml" ]
+      if (!_strip_resources && _scanned_files.has_r_text_file) {
+        # Certain packages, in particular Play Services have no R.txt even
+        # though its presence is mandated by AAR spec. Such packages cause
+        # spurious rebuilds if this output is specified unconditionally.
+        outputs += [ "${_output_path}/R.txt" ]
+      }
+
+      if (!_strip_resources && _scanned_files.resources != []) {
+        outputs += get_path_info(
+                rebase_path(_scanned_files.resources, "", _output_path),
+                "abspath")
+      }
+      if (_scanned_files.has_classes_jar) {
+        outputs += [ "${_output_path}/classes.jar" ]
+      }
+      outputs +=
+          get_path_info(rebase_path(_scanned_files.subjars, "", _output_path),
+                        "abspath")
+      if (!_ignore_proguard_configs) {
+        if (_scanned_files.has_proguard_flags) {
+          outputs += [ "${_output_path}/proguard.txt" ]
+        }
+      }
+
+      if (_extract_native_libraries && _scanned_files.has_native_libraries) {
+        outputs += get_path_info(
+                rebase_path(_scanned_files.native_libraries, "", _output_path),
+                "abspath")
+      }
+      if (_use_scanned_assets) {
+        outputs +=
+            get_path_info(rebase_path(_scanned_files.assets, "", _output_path),
+                          "abspath")
+      }
+    }
+
+    _has_unignored_resources =
+        !_strip_resources &&
+        (_scanned_files.resources != [] || _scanned_files.has_r_text_file)
+
+    _should_process_manifest =
+        !_ignore_manifest && !_scanned_files.is_manifest_empty
+
+    # Create the android_resources target for resources.
+    if (_has_unignored_resources || _should_process_manifest) {
+      _res_target_name = "${target_name}__resources"
+      android_resources(_res_target_name) {
+        forward_variables_from(invoker,
+                               [
+                                 "custom_package",
+                                 "resource_overlay",
+                                 "testonly",
+                                 "strip_drawables",
+                               ])
+        deps = [ ":$_unpack_target_name" ]
+        if (_should_process_manifest) {
+          android_manifest_dep = ":$_unpack_target_name"
+          android_manifest = "${_output_path}/AndroidManifest.xml"
+        } else if (defined(_scanned_files.manifest_package) &&
+                   !defined(custom_package)) {
+          custom_package = _scanned_files.manifest_package
+        }
+
+        sources = []
+        if (!_strip_resources) {
+          sources = rebase_path(_scanned_files.resources, "", _output_path)
+        }
+        if (!_strip_resources && _scanned_files.has_r_text_file) {
+          r_text_file = "${_output_path}/R.txt"
+        }
+      }
+    } else if (defined(invoker.strip_drawables)) {
+      not_needed(invoker, [ "strip_drawables" ])
+    }
+
+    if (_ignore_manifest) {
+      # Having this available can be useful for DFMs that depend on AARs. It
+      # provides a way to have manifest entries go into the base split while
+      # the code goes into a DFM.
+      java_group("${target_name}__ignored_manifest") {
+        forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+        deps = [ ":$_unpack_target_name" ]
+        mergeable_android_manifests = [ "${_output_path}/AndroidManifest.xml" ]
+      }
+    }
+
+    # Create the android_assets target for assets
+    if (_use_scanned_assets) {
+      _assets_target_name = "${target_name}__assets"
+      android_assets(_assets_target_name) {
+        forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+        renaming_sources = []
+        renaming_destinations = []
+        foreach(_asset_file, _scanned_files.assets) {
+          _original_path =
+              get_path_info(rebase_path(_asset_file, "", _output_path),
+                            "abspath")
+          _updated_path = string_replace(_asset_file, "assets/", "", 1)
+          renaming_sources += [ _original_path ]
+          renaming_destinations += [ _updated_path ]
+        }
+      }
+    }
+
+    # Create android_java_prebuilt target for classes.jar.
+    if (_scanned_files.has_classes_jar) {
+      _java_library_vars = [
+        "bytecode_rewriter_target",
+        "enable_bytecode_checks",
+        "jar_excluded_patterns",
+        "jar_included_patterns",
+        "missing_classes_allowlist",
+        "requires_android",
+        "testonly",
+        "use_classic_desugar",
+      ]
+
+      # Create android_java_prebuilt target for extra jars within jars/.
+      _subjar_targets = []
+      foreach(_tuple, _scanned_files.subjar_tuples) {
+        _current_target = "${target_name}__subjar_${_tuple[0]}"
+        _subjar_targets += [ ":$_current_target" ]
+        java_prebuilt(_current_target) {
+          forward_variables_from(invoker, _java_library_vars)
+          deps = [ ":$_unpack_target_name" ]
+          if (!defined(requires_android)) {
+            requires_android = true
+          }
+          supports_android = true
+          jar_path = "$_output_path/${_tuple[1]}"
+          _base_output_name = get_path_info(jar_path, "name")
+          output_name = "${invoker.target_name}-$_base_output_name"
+          public_target_label = invoker.target_name
+        }
+      }
+
+      _jar_target_name = "${target_name}__classes"
+      java_prebuilt(_jar_target_name) {
+        forward_variables_from(invoker, _java_library_vars)
+        forward_variables_from(invoker,
+                               [
+                                 "deps",
+                                 "input_jars_paths",
+                                 "proguard_configs",
+                               ])
+        if (!defined(deps)) {
+          deps = []
+        }
+        deps += _subjar_targets + [ ":$_unpack_target_name" ]
+        if (defined(_res_target_name)) {
+          deps += [ ":$_res_target_name" ]
+        }
+        if (!defined(requires_android)) {
+          requires_android = true
+        }
+        supports_android = true
+        jar_path = "$_output_path/classes.jar"
+        aar_path = invoker.aar_path
+        output_name = invoker.target_name
+
+        if (!_ignore_proguard_configs) {
+          if (!defined(proguard_configs)) {
+            proguard_configs = []
+          }
+          if (_scanned_files.has_proguard_flags) {
+            proguard_configs += [ "$_output_path/proguard.txt" ]
+          }
+        }
+        public_target_label = invoker.target_name
+      }
+    }
+
+    java_group(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+      public_deps = [ ":$_unpack_target_name" ]
+      deps = []
+      if (defined(_jar_target_name)) {
+        deps += [ ":$_jar_target_name" ]
+
+        # Although subjars are meant to be private, we add them as deps here
+        # because in practice they seem to contain classes required to be in the
+        # classpath.
+        deps += _subjar_targets
+      }
+      if (defined(_res_target_name)) {
+        deps += [ ":$_res_target_name" ]
+      }
+      if (defined(_assets_target_name)) {
+        deps += [ ":$_assets_target_name" ]
+      }
+    }
+  }
+
+  # Create an Android application bundle from one base android_apk target,
+  # and zero or more associated android_apk.
+  #
+  # Variables:
+  #    base_module_target: Name of the android_app_bundle_module target
+  #      corresponding to the base module for this application bundle. The
+  #      bundle file will include the same content in its base module, though in
+  #      a slightly different format.
+  #
+  #    bundle_base_path: Optional. If set, the bundle will be output to this
+  #      directory. Defaults to "$root_build_dir/apks".
+  #
+  #    bundle_name: Optional. If set, the bundle will be output to the
+  #      filename "${bundle_name}.aab".
+  #
+  #    extra_modules: Optional list of scopes, one per extra module used by
+  #      this bundle. Each scope must have a 'name' field that specifies the
+  #      module name (which cannot be 'base', since this is reserved for the
+  #      base module), and an 'apk_target' field that specified the
+  #      corresponding android_apk target name the module is modeled on.
+  #
+  #    enable_language_splits: Optional. If true, enable APK splits based
+  #      on languages.
+  #
+  #    keystore_path: optional keystore path, used only when generating APKs.
+  #    keystore_name: optional keystore name, used only when generating APKs.
+  #    keystore_password: optional keystore password, used only when
+  #      generating APKs.
+  #
+  #    command_line_flags_file: Optional. If provided, named of the on-device
+  #      file that will be used to store command-line arguments. The default
+  #      is 'command_line_flags_file', but this is typically redefined to
+  #      something more specific for certain bundles (e.g. the Chromium based
+  #      APKs use 'chrome-command-line', the WebView one uses
+  #      'webview-command-line').
+  #
+  #    proguard_enabled: Optional. True if proguarding is enabled for this
+  #      bundle. Default is to enable this only for release builds. Note that
+  #      this will always perform synchronized proguarding.
+  #
+  #    proguard_enable_obfuscation: Whether to enable obfuscation (default=true)
+  #
+  #    enable_multidex: Optional. Enable multidexing of optimized modules jars
+  #      when using synchronized proguarding. Only applies to base module.
+  #
+  #    proguard_android_sdk_dep: Optional. android_system_java_prebuilt() target
+  #      used as a library jar for synchronized proguarding.
+  #
+  #    compress_shared_libraries: Optional. Whether to compress shared libraries
+  #      such that they are extracted upon install. Libraries prefixed with
+  #      "crazy." are never compressed.
+  #
+  #    system_image_locale_allowlist: List of locales that should be included
+  #      on system APKs generated from this bundle.
+  #
+  #    static_library_provider: Specifies a single target that this target will
+  #      use as a static library APK.
+  #      Additionally, when allotting libraries to be packaged into modules, the
+  #      libraries packaged into the static library will be accounted for to
+  #      avoid library duplication. Effectively, the static library will be
+  #      treated as the parent of the base module.
+  #
+  #    expected_libs_and_assets: Verify the list of included native libraries
+  #      and assets is consistent with the given expectation file.
+  #    expected_libs_and_assets_base: Treat expected_libs_and_assets as a diff
+  #      with this file as the base.
+  #    expected_proguard_config: Checks that the merged set of proguard flags
+  #      matches the given config.
+  #    expected_proguard_config_base: Treat expected_proguard_config as a diff
+  #      with this file as the base.
+  #
+  #    version_code: Optional. Version code of the target.
+  #
+  #    is_multi_abi: If true will add a library placeholder for the missing ABI
+  #      if either the primary or the secondary ABI has no native libraries set.
+  #
+  #    default_modules_for_testing: (optional): A list of DFM that the wrapper
+  #      script should install. This is for local testing only, and does not
+  #      affect the actual DFM in production.
+  # Example:
+  #   android_app_bundle("chrome_public_bundle") {
+  #      base_module_target = "//chrome/android:chrome_public_apk"
+  #      extra_modules = [
+  #        { # NOTE: Scopes require one field per line, and no comma separators.
+  #          name = "my_module"
+  #          module_target = ":my_module"
+  #        },
+  #      ]
+  #   }
+  #
+  template("android_app_bundle") {
+    _target_name = target_name
+    _uses_static_library = defined(invoker.static_library_provider)
+    _proguard_enabled =
+        defined(invoker.proguard_enabled) && invoker.proguard_enabled
+
+    if (defined(invoker.version_code)) {
+      _version_code = invoker.version_code
+    } else {
+      _version_code = android_default_version_code
+    }
+
+    if (android_override_version_code != "") {
+      _version_code = android_override_version_code
+    }
+
+    # Prevent "unused variable".
+    not_needed([ "_version_code" ])
+
+    _bundle_base_path = "$root_build_dir/apks"
+    if (defined(invoker.bundle_base_path)) {
+      _bundle_base_path = invoker.bundle_base_path
+    }
+
+    _bundle_name = _target_name
+    if (defined(invoker.bundle_name)) {
+      _bundle_name = invoker.bundle_name
+    }
+    _bundle_path = "$_bundle_base_path/${_bundle_name}.aab"
+    _rebased_bundle_path = rebase_path(_bundle_path, root_build_dir)
+
+    _base_target_name = get_label_info(invoker.base_module_target, "name")
+    _base_target_gen_dir =
+        get_label_info(invoker.base_module_target, "target_gen_dir")
+    _base_module_build_config =
+        "$_base_target_gen_dir/${_base_target_name}.build_config.json"
+    _base_module_build_config_target =
+        "${invoker.base_module_target}$build_config_target_suffix"
+    _rebased_base_module_build_config =
+        rebase_path(_base_module_build_config, root_build_dir)
+
+    _modules = [
+      {
+        name = "base"
+        module_target = invoker.base_module_target
+        build_config = _base_module_build_config
+        build_config_target = _base_module_build_config_target
+        if (_uses_static_library) {
+          parent = "lib"
+        }
+      },
+    ]
+
+    _enable_multidex =
+        !defined(invoker.enable_multidex) || invoker.enable_multidex
+
+    # Prevent "unused variable".
+    not_needed([ "_enable_multidex" ])
+
+    if (_proguard_enabled) {
+      _uses_static_library_synchronized_proguard =
+          defined(invoker.static_library_synchronized_proguard) &&
+          invoker.static_library_synchronized_proguard
+
+      # TODO(crbug.com/1032609): Remove dexsplitter from Trichrome Proguard.
+      _dex_target = "${_target_name}__dex"
+      _proguard_mapping_path = "${_bundle_path}.mapping"
+    }
+
+    assert(_proguard_enabled || !defined(invoker.enable_multidex),
+           "Bundle only adds dexing step if proguarding is enabled.")
+
+    if (defined(invoker.extra_modules)) {
+      _module_count = 0
+      not_needed([ "_module_count" ])
+
+      foreach(_module, invoker.extra_modules) {
+        _module_count += 1
+        assert(defined(_module.name),
+               "Missing 'name' field for extra module #${_module_count}.")
+        assert(_module.name != "base",
+               "Module name 'base' is reserved for the main bundle module")
+        assert(
+            defined(_module.module_target),
+            "Missing 'module_target' field for extra module ${_module.name}.")
+        _module_target = _module.module_target
+        _module_target_name = get_label_info(_module_target, "name")
+        _module_target_gen_dir =
+            get_label_info(_module_target, "target_gen_dir")
+        _module.build_config =
+            "$_module_target_gen_dir/${_module_target_name}.build_config.json"
+        _module.build_config_target =
+            "$_module_target$build_config_target_suffix"
+        _module.parent = "base"
+        _modules += [ _module ]
+      }
+    }
+
+    # Make build config, which is required for synchronized proguarding.
+    _module_java_targets = []
+    _module_build_configs = []
+    _module_targets = []
+    foreach(_module, _modules) {
+      _module_targets += [ _module.module_target ]
+      _module_java_targets += [ "${_module.module_target}__java" ]
+      _module_build_configs += [ _module.build_config ]
+    }
+
+    if (_uses_static_library) {
+      _lib_proxy_module = {
+        name = "lib"
+      }
+      _static_library_target_name =
+          get_label_info(invoker.static_library_provider, "name")
+      _static_library_gen_dir =
+          get_label_info(invoker.static_library_provider, "target_gen_dir")
+      _lib_proxy_module.build_config = "$_static_library_gen_dir/$_static_library_target_name.build_config.json"
+      _lib_proxy_module.build_config_target =
+          "${invoker.static_library_provider}$build_config_target_suffix"
+    }
+
+    # Allot native libraries to modules they should be packaged into. This is
+    # necessary since all libraries that are depended on by multiple modules
+    # have to go into base or the static shared library if it exists.
+    # TODO(crbug.com/1021565): It would be nice if this lived outside the
+    # android_app_bundle template and the static shared library would pull in
+    # the libs as allotted by this step.
+    _native_libraries_config =
+        "$target_gen_dir/$_target_name.native_libraries_config"
+    _native_libraries_config_target = "${_target_name}__allot_native_libraries"
+    allot_native_libraries(_native_libraries_config_target) {
+      modules = _modules
+      native_libraries_filearg_keys = [
+        "native:libraries",
+        "native:loadable_modules",
+      ]
+      output = _native_libraries_config
+      if (_uses_static_library) {
+        modules += [ _lib_proxy_module ]
+      }
+    }
+    if (defined(android_app_secondary_abi)) {
+      _secondary_abi_native_libraries_config =
+          "$target_gen_dir/$_target_name.secondary_abi_native_libraries_config"
+      _secondary_abi_native_libraries_config_target =
+          "${_target_name}__allot_secondary_abi_native_libraries"
+      allot_native_libraries(_secondary_abi_native_libraries_config_target) {
+        modules = _modules
+        native_libraries_filearg_keys = [
+          "native:secondary_abi_libraries",
+          "native:secondary_abi_loadable_modules",
+        ]
+        output = _secondary_abi_native_libraries_config
+        if (_uses_static_library) {
+          modules += [ _lib_proxy_module ]
+        }
+      }
+    }
+
+    # Used to expose the module Java targets of the bundle.
+    group("${_target_name}__java") {
+      deps = _module_java_targets
+    }
+    group("${_target_name}__compile_resources") {
+      deps = [ "${invoker.base_module_target}__compile_resources" ]
+    }
+
+    _build_config = "$target_gen_dir/${_target_name}.build_config.json"
+    _rebased_build_config = rebase_path(_build_config, root_build_dir)
+    _build_config_target = "$_target_name$build_config_target_suffix"
+    if (defined(invoker.proguard_android_sdk_dep)) {
+      proguard_android_sdk_dep_ = invoker.proguard_android_sdk_dep
+    } else {
+      proguard_android_sdk_dep_ = "//third_party/android_sdk:android_sdk_java"
+    }
+
+    if (_proguard_enabled) {
+      _proguard_mapping_path = "${_bundle_path}.mapping"
+    }
+
+    write_build_config(_build_config_target) {
+      type = "android_app_bundle"
+      possible_config_deps = _module_targets + [ proguard_android_sdk_dep_ ]
+      build_config = _build_config
+      proguard_enabled = _proguard_enabled
+      module_build_configs = _module_build_configs
+
+      if (_proguard_enabled) {
+        proguard_mapping_path = _proguard_mapping_path
+      }
+    }
+
+    if (_proguard_enabled) {
+      # If this Bundle uses a static library, the static library APK will
+      # create the synchronized dex file path.
+      if (!_uses_static_library_synchronized_proguard) {
+        dex(_dex_target) {
+          forward_variables_from(invoker,
+                                 [
+                                   "expected_proguard_config",
+                                   "expected_proguard_config_base",
+                                   "min_sdk_version",
+                                   "proguard_enable_obfuscation",
+                                 ])
+          if (defined(expected_proguard_config)) {
+            top_target_name = _target_name
+          }
+          enable_multidex = _enable_multidex
+          proguard_enabled = true
+          proguard_mapping_path = _proguard_mapping_path
+          proguard_sourcefile_suffix = "$android_channel-$_version_code"
+          build_config = _build_config
+
+          deps = _module_java_targets + [ ":$_build_config_target" ]
+          modules = _modules
+        }
+      }
+    }
+
+    _all_create_module_targets = []
+    _all_module_zip_paths = []
+    _all_module_build_configs = []
+    _all_module_unused_resources_deps = []
+    foreach(_module, _modules) {
+      _module_target = _module.module_target
+      _module_build_config = _module.build_config
+      _module_build_config_target = _module.build_config_target
+
+      if (!_proguard_enabled) {
+        _dex_target_for_module = "${_module_target}__final_dex"
+      } else {
+        _dex_target_for_module = ":$_dex_target"
+      }
+
+      # Generate one module .zip file per bundle module.
+      #
+      # Important: the bundle tool uses the module's zip filename as
+      # the internal module name inside the final bundle, in other words,
+      # this file *must* be named ${_module.name}.zip
+      _create_module_target = "${_target_name}__${_module.name}__create"
+      _module_zip_path = "$target_gen_dir/$target_name/${_module.name}.zip"
+      create_android_app_bundle_module(_create_module_target) {
+        forward_variables_from(invoker,
+                               [
+                                 "is_multi_abi",
+                                 "min_sdk_version",
+                                 "uncompress_dex",
+                                 "proguard_enabled",
+                               ])
+        module_name = _module.name
+        build_config = _module_build_config
+        module_zip_path = _module_zip_path
+        native_libraries_config = _native_libraries_config
+
+        if (module_name == "base" &&
+            defined(invoker.expected_libs_and_assets)) {
+          forward_variables_from(invoker,
+                                 [
+                                   "expected_libs_and_assets",
+                                   "expected_libs_and_assets_base",
+                                 ])
+          top_target_name = _target_name
+          build_config_target = _module_build_config_target
+          native_libraries_config_target = ":$_native_libraries_config_target"
+          if (defined(android_app_secondary_abi)) {
+            secondary_abi_native_libraries_config_target =
+                ":$_secondary_abi_native_libraries_config_target"
+          }
+        }
+
+        deps = [
+          ":$_native_libraries_config_target",
+          _dex_target_for_module,
+          _module_build_config_target,
+          _module_target,
+        ]
+
+        if (defined(android_app_secondary_abi)) {
+          secondary_abi_native_libraries_config =
+              _secondary_abi_native_libraries_config
+          deps += [ ":$_secondary_abi_native_libraries_config_target" ]
+        }
+      }
+
+      _all_create_module_targets += [
+        ":$_create_module_target",
+        _module_build_config_target,
+        "${_module_target}__compile_resources",
+      ]
+      _all_module_zip_paths += [ _module_zip_path ]
+      _all_module_build_configs += [ _module_build_config ]
+      _all_module_unused_resources_deps += [
+        "${_module_target}__compile_resources",
+        _dex_target_for_module,
+        _module_build_config_target,
+      ]
+    }
+    if (defined(invoker.strip_unused_resources) &&
+        invoker.strip_unused_resources) {
+      # Resources only live in the base module so we define the unused resources
+      # target only on the base module target.
+      _unused_resources_target = "${_base_target_name}__unused_resources"
+      _unused_resources_config =
+          "${_base_target_gen_dir}/${_base_target_name}_unused_resources.config"
+      unused_resources(_unused_resources_target) {
+        deps = _all_module_unused_resources_deps
+        all_module_build_configs = _all_module_build_configs
+        build_config = _base_module_build_config
+        if (_proguard_enabled) {
+          proguard_mapping_path = _proguard_mapping_path
+        }
+        output_config = _unused_resources_config
+      }
+    }
+
+    _all_rebased_module_zip_paths =
+        rebase_path(_all_module_zip_paths, root_build_dir)
+
+    _enable_language_splits = defined(invoker.enable_language_splits) &&
+                              invoker.enable_language_splits
+
+    _split_dimensions = []
+    if (_enable_language_splits) {
+      _split_dimensions += [ "language" ]
+    }
+
+    _keystore_path = android_keystore_path
+    _keystore_password = android_keystore_password
+    _keystore_name = android_keystore_name
+
+    if (defined(invoker.keystore_path)) {
+      _keystore_path = invoker.keystore_path
+      _keystore_password = invoker.keystore_password
+      _keystore_name = invoker.keystore_name
+    }
+
+    _rebased_keystore_path = rebase_path(_keystore_path, root_build_dir)
+
+    _bundle_target_name = "${_target_name}__bundle"
+    action_with_pydeps(_bundle_target_name) {
+      script = "//build/android/gyp/create_app_bundle.py"
+      inputs = _all_module_zip_paths + _all_module_build_configs
+      outputs = [ _bundle_path ]
+      deps = _all_create_module_targets + [ ":$_build_config_target" ]
+      args = [
+        "--out-bundle=$_rebased_bundle_path",
+        "--rtxt-out-path=$_rebased_bundle_path.R.txt",
+        "--pathmap-out-path=$_rebased_bundle_path.pathmap.txt",
+        "--module-zips=$_all_rebased_module_zip_paths",
+      ]
+      if (_split_dimensions != []) {
+        args += [ "--split-dimensions=$_split_dimensions" ]
+      }
+      if (defined(invoker.compress_shared_libraries) &&
+          invoker.compress_shared_libraries) {
+        args += [ "--compress-shared-libraries" ]
+      }
+      _min_sdk_version = default_min_sdk_version
+      if (defined(invoker.min_sdk_version)) {
+        _min_sdk_version = invoker.min_sdk_version
+      }
+
+      # Android P+ support loading from stored dex.
+      if (_min_sdk_version < 27) {
+        args += [ "--compress-dex" ]
+      }
+
+      if (treat_warnings_as_errors) {
+        args += [ "--warnings-as-errors" ]
+      }
+
+      if (_enable_language_splits) {
+        args += [
+          "--base-allowlist-rtxt-path=@FileArg(" + "${_rebased_base_module_build_config}:deps_info:base_allowlist_rtxt_path)",
+          "--base-module-rtxt-path=@FileArg(" +
+              "${_rebased_base_module_build_config}:deps_info:r_text_path)",
+        ]
+      }
+      if (defined(invoker.validate_services) && invoker.validate_services) {
+        args += [ "--validate-services" ]
+      }
+
+      foreach(_module, _modules) {
+        _rebased_build_config =
+            rebase_path(_module.build_config, root_build_dir)
+        args += [
+          "--uncompressed-assets=@FileArg(" +
+              "$_rebased_build_config:uncompressed_assets)",
+          "--rtxt-in-paths=@FileArg(" +
+              "$_rebased_build_config:deps_info:r_text_path)",
+          "--pathmap-in-paths=@FileArg(" +
+              "$_rebased_build_config:deps_info:module_pathmap_path)",
+          "--module-name=" + _module.name,
+        ]
+      }
+
+      # http://crbug.com/725224. Fix for bots running out of memory.
+      if (defined(java_cmd_pool_size)) {
+        pool = "//build/config/android:java_cmd_pool($default_toolchain)"
+      } else {
+        pool = "//build/toolchain:link_pool($default_toolchain)"
+      }
+    }
+
+    # Create size info files for targets that care about size
+    # (have proguard enabled).
+    if (_proguard_enabled) {
+      # Merge all module targets to obtain size info files for all targets.
+      _all_module_targets = _module_targets
+
+      _size_info_target = "${_target_name}__size_info"
+      create_size_info_files(_size_info_target) {
+        name = "$_bundle_name.aab"
+        deps = _all_module_targets + [ ":$_build_config_target" ]
+        module_build_configs = _all_module_build_configs
+      }
+    }
+
+    if (_uses_static_library) {
+      _install_artifacts_target = "${target_name}__install_artifacts"
+      _install_artifacts_json =
+          "${target_gen_dir}/${target_name}.install_artifacts"
+      generated_file(_install_artifacts_target) {
+        output_conversion = "json"
+        deps = [ invoker.static_library_provider ]
+        outputs = [ _install_artifacts_json ]
+        data_keys = [ "install_artifacts" ]
+        rebase = root_build_dir
+      }
+    }
+
+    # Generate a wrapper script for the bundle.
+    _android_aapt2_path = android_sdk_tools_bundle_aapt2
+
+    _bundle_apks_path = "$_bundle_base_path/$_bundle_name.apks"
+    _bundle_wrapper_script_dir = "$root_build_dir/bin"
+    _bundle_wrapper_script_path = "$_bundle_wrapper_script_dir/$_target_name"
+
+    action_with_pydeps("${_target_name}__wrapper_script") {
+      script = "//build/android/gyp/create_bundle_wrapper_script.py"
+      inputs = [ _base_module_build_config ]
+      outputs = [ _bundle_wrapper_script_path ]
+
+      # Telemetry for bundles uses the wrapper script for installation.
+      data = [
+        _bundle_wrapper_script_path,
+        _android_aapt2_path,
+        _keystore_path,
+        _bundle_path,
+      ]
+      data_deps = [
+        "//build/android:apk_operations_py",
+        "//build/android:stack_tools",
+      ]
+
+      deps = [ _base_module_build_config_target ]
+      args = [
+        "--script-output-path",
+        rebase_path(_bundle_wrapper_script_path, root_build_dir),
+        "--package-name=@FileArg(" +
+            "$_rebased_base_module_build_config:deps_info:package_name)",
+        "--aapt2",
+        rebase_path(_android_aapt2_path, root_build_dir),
+        "--bundle-path",
+        _rebased_bundle_path,
+        "--bundle-apks-path",
+        rebase_path(_bundle_apks_path, root_build_dir),
+        "--target-cpu=$target_cpu",
+        "--keystore-path",
+        _rebased_keystore_path,
+        "--keystore-password",
+        _keystore_password,
+        "--key-name",
+        _keystore_name,
+      ]
+      if (defined(invoker.default_modules_for_testing)) {
+        args += [ "--default-modules" ] + invoker.default_modules_for_testing
+      }
+      if (defined(invoker.system_image_locale_allowlist)) {
+        args += [
+          "--system-image-locales=${invoker.system_image_locale_allowlist}",
+        ]
+      }
+      if (defined(invoker.command_line_flags_file)) {
+        args += [
+          "--command-line-flags-file",
+          invoker.command_line_flags_file,
+        ]
+      }
+      if (_uses_static_library) {
+        deps += [ ":$_install_artifacts_target" ]
+        _rebased_install_artifacts_json =
+            rebase_path(_install_artifacts_json, root_build_dir)
+        _static_library_apk_path =
+            "@FileArg($_rebased_install_artifacts_json[])"
+        args += [
+          "--additional-apk",
+          _static_library_apk_path,
+        ]
+      }
+
+      if (_proguard_enabled) {
+        args += [
+          "--proguard-mapping-path",
+          rebase_path(_proguard_mapping_path, root_build_dir),
+        ]
+
+        # Required by logcat command.
+        data_deps += [ "//build/android/stacktrace:java_deobfuscate" ]
+        data += [ _proguard_mapping_path ]
+      }
+    }
+
+    _enable_lint = defined(invoker.enable_lint) && invoker.enable_lint &&
+                   !disable_android_lint
+    if (_enable_lint) {
+      android_lint("${target_name}__lint") {
+        forward_variables_from(invoker,
+                               [
+                                 "lint_baseline_file",
+                                 "lint_suppressions_file",
+                                 "min_sdk_version",
+                               ])
+        build_config = _build_config
+        build_config_dep = ":$_build_config_target"
+        deps = _module_java_targets
+        if (defined(invoker.lint_suppressions_dep)) {
+          deps += [ invoker.lint_suppressions_dep ]
+        }
+        if (defined(invoker.lint_min_sdk_version)) {
+          min_sdk_version = invoker.lint_min_sdk_version
+        }
+      }
+    } else {
+      not_needed(invoker,
+                 [
+                   "lint_baseline_file",
+                   "lint_min_sdk_version",
+                   "lint_suppressions_dep",
+                   "lint_suppressions_file",
+                 ])
+    }
+
+    group(_target_name) {
+      public_deps = [
+        ":$_bundle_target_name",
+        ":${_target_name}__wrapper_script",
+      ]
+      if (defined(_size_info_target)) {
+        public_deps += [ ":$_size_info_target" ]
+      }
+      if (_enable_lint) {
+        if (!defined(data_deps)) {
+          data_deps = []
+        }
+        data_deps += [ ":${target_name}__lint" ]
+      }
+    }
+
+    _apks_path = "$root_build_dir/apks/$_bundle_name.apks"
+    action_with_pydeps("${_target_name}_apks") {
+      script = "//build/android/gyp/create_app_bundle_apks.py"
+      inputs = [ _bundle_path ]
+      outputs = [ _apks_path ]
+      data = [ _apks_path ]
+      args = [
+        "--bundle",
+        _rebased_bundle_path,
+        "--output",
+        rebase_path(_apks_path, root_build_dir),
+        "--aapt2-path",
+        rebase_path(android_sdk_tools_bundle_aapt2, root_build_dir),
+        "--keystore-path",
+        rebase_path(android_keystore_path, root_build_dir),
+        "--keystore-name",
+        android_keystore_name,
+        "--keystore-password",
+        android_keystore_password,
+      ]
+      if (debuggable_apks) {
+        args += [ "--local-testing" ]
+      }
+      deps = [ ":$_bundle_target_name" ]
+      metadata = {
+        install_artifacts = [ _apks_path ]
+      }
+      if (defined(invoker.static_library_provider)) {
+        metadata.install_artifacts_barrier = []
+      }
+
+      # http://crbug.com/725224. Fix for bots running out of memory.
+      if (defined(java_cmd_pool_size)) {
+        pool = "//build/config/android:java_cmd_pool($default_toolchain)"
+      } else {
+        pool = "//build/toolchain:link_pool($default_toolchain)"
+      }
+    }
+  }
+
+  # Create an .apks file from an .aab file. The .apks file will contain the
+  # minimal set of .apk files needed for tracking binary size.
+  # The file will be created at "$bundle_path_without_extension.minimal.apks".
+  #
+  # Variables:
+  #   bundle_path: Path to the input .aab file.
+  #
+  # Example:
+  #   create_app_bundle_minimal_apks("minimal_apks") {
+  #     deps = [
+  #       ":bundle_target",
+  #     ]
+  #     bundle_path = "$root_build_dir/apks/Bundle.aab"
+  #   }
+  template("create_app_bundle_minimal_apks") {
+    action_with_pydeps(target_name) {
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "deps" ])
+      script = "//build/android/gyp/create_app_bundle_apks.py"
+      _dir = get_path_info(invoker.bundle_path, "dir")
+      _name = get_path_info(invoker.bundle_path, "name")
+      _output_path = "$_dir/$_name.minimal.apks"
+      outputs = [ _output_path ]
+      inputs = [ invoker.bundle_path ]
+      args = [
+        "--bundle",
+        rebase_path(invoker.bundle_path, root_build_dir),
+        "--output",
+        rebase_path(_output_path, root_build_dir),
+        "--aapt2-path",
+        rebase_path(android_sdk_tools_bundle_aapt2, root_build_dir),
+        "--keystore-path",
+        rebase_path(android_keystore_path, root_build_dir),
+        "--keystore-name",
+        android_keystore_name,
+        "--keystore-password",
+        android_keystore_password,
+        "--minimal",
+      ]
+    }
+  }
+}
+
+# Generate an Android resources target that contains localized strings
+# describing the current locale used by the Android framework to display
+# UI strings. These are used by
+# org.chromium.chrome.browser.ChromeLocalizationUtils.
+#
+# Variables:
+#    ui_locales: List of Chromium locale names to generate resources for.
+#
+template("generate_ui_locale_resources") {
+  _generating_target_name = "${target_name}__generate"
+  _rebased_output_zip_path = rebase_path(target_gen_dir, root_gen_dir)
+  _output_zip = "${root_out_dir}/resource_zips/${_rebased_output_zip_path}/" +
+                "${target_name}.zip"
+
+  action_with_pydeps(_generating_target_name) {
+    script = "//build/android/gyp/create_ui_locale_resources.py"
+    outputs = [ _output_zip ]
+    args = [
+      "--locale-list=${invoker.ui_locales}",
+      "--output-zip",
+      rebase_path(_output_zip, root_build_dir),
+    ]
+  }
+
+  android_generated_resources(target_name) {
+    generating_target = ":$_generating_target_name"
+    generated_resources_zip = _output_zip
+  }
+}
diff --git a/third_party/libwebrtc/build/config/android/sdk.gni b/third_party/libwebrtc/build/config/android/sdk.gni
new file mode 100644
index 0000000000..8547170167
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/sdk.gni
@@ -0,0 +1,10 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# The default SDK release used by public builds. Value may differ in
+# internal builds.
+default_android_sdk_release = "s"
+
+# SDK releases against which public builds are supported.
+public_sdk_releases = [ "s" ]
diff --git a/third_party/libwebrtc/build/config/android/test/classpath_order/BUILD.gn b/third_party/libwebrtc/build/config/android/test/classpath_order/BUILD.gn
new file mode 100644
index 0000000000..decd1a84d2
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/classpath_order/BUILD.gn
@@ -0,0 +1,111 @@
+# Copyright 2021 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/android/rules.gni")
+
+template("test_resources") {
+  jinja_template_resources(target_name) {
+    forward_variables_from(invoker, "*")
+    testonly = true
+    variables = [ "resource_name=$resource_name" ]
+    res_dir = "java/res_template"
+    resources = [ "java/res_template/values/values.xml" ]
+  }
+}
+
+template("generate_dummy_android_library") {
+  # No underscores to avoid crbug.com/908819.
+  _generate_java_source_target_name = "${target_name}generatejavasource"
+  jinja_template(_generate_java_source_target_name) {
+    testonly = true
+    input = "java/src/org/chromium/build/classpath_order/Dummy.java.jinja2"
+    output = "$target_gen_dir/java/src/org/chromium/build/classpath_order/${invoker.class_name}.java"
+    variables = [ "class_name=${invoker.class_name}" ]
+  }
+
+  android_library(target_name) {
+    forward_variables_from(invoker, "*")
+
+    if (!defined(invoker.deps)) {
+      deps = []
+    }
+
+    sources = get_target_outputs(":${_generate_java_source_target_name}")
+    deps += [ ":${_generate_java_source_target_name}" ]
+  }
+}
+
+# Test that classpath order keeps resources accessible when multiple targets generate
+# resources for the same package. Specifically, test that an android_library precedes
+# its dependencies regardless of the relative lexographic order.
+
+test_resources("a1_dependency_resources") {
+  resource_name = "a1_dependency_resource"
+}
+
+generate_dummy_android_library("a1_dependency_java") {
+  testonly = true
+  class_name = "A1Dependency"
+  resources_package = "org.chromium.build.classpath_order.test1"
+  deps = [ ":a1_dependency_resources" ]
+}
+
+test_resources("z1_master_resources") {
+  resource_name = "z1_master_resource"
+  deps = [ ":a1_dependency_resources" ]
+}
+
+generate_dummy_android_library("z1_master_java") {
+  testonly = true
+  class_name = "Z1Master"
+  resources_package = "org.chromium.build.classpath_order.test1"
+  deps = [
+    ":a1_dependency_java",
+    ":z1_master_resources",
+  ]
+}
+
+test_resources("z2_dependency_resources") {
+  resource_name = "z2_dependency_resource"
+}
+
+generate_dummy_android_library("z2_dependency_java") {
+  testonly = true
+  class_name = "Z2Dependency"
+  resources_package = "org.chromium.build.classpath_order.test2"
+  deps = [ ":z2_dependency_resources" ]
+}
+
+test_resources("a2_master_resources") {
+  resource_name = "a2_master_resource"
+  deps = [ ":z2_dependency_resources" ]
+}
+
+generate_dummy_android_library("a2_master_java") {
+  testonly = true
+  class_name = "A2Master"
+  resources_package = "org.chromium.build.classpath_order.test2"
+  deps = [
+    ":a2_master_resources",
+    ":z2_dependency_java",
+  ]
+}
+
+java_library("junit_tests") {
+  bypass_platform_checks = true
+  testonly = true
+  sources =
+      [ "java/src/org/chromium/build/classpath_order/ClassPathOrderTest.java" ]
+  deps = [
+    ":a1_dependency_java",
+    ":a2_master_java",
+    ":z1_master_java",
+    ":z2_dependency_java",
+    "//testing/android/junit:junit_test_support",
+    "//third_party/android_deps:robolectric_all_java",
+    "//third_party/android_support_test_runner:runner_java",
+    "//third_party/androidx:androidx_test_runner_java",
+    "//third_party/junit",
+  ]
+}
diff --git a/third_party/libwebrtc/build/config/android/test/classpath_order/java/res_template/values/values.xml b/third_party/libwebrtc/build/config/android/test/classpath_order/java/res_template/values/values.xml
new file mode 100644
index 0000000000..ee706b289b
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/classpath_order/java/res_template/values/values.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2021 The Chromium Authors. All rights reserved.
+     Use of this source code is governed by a BSD-style license that can be
+     found in the LICENSE file. -->
+
+
+<resources xmlns:android="http://schemas.android.com/apk/res/android">
+    <integer name="{{resource_name}}">42</integer>
+</resources>
diff --git a/third_party/libwebrtc/build/config/android/test/classpath_order/java/src/org/chromium/build/classpath_order/ClassPathOrderTest.java b/third_party/libwebrtc/build/config/android/test/classpath_order/java/src/org/chromium/build/classpath_order/ClassPathOrderTest.java
new file mode 100644
index 0000000000..c5a9202605
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/classpath_order/java/src/org/chromium/build/classpath_order/ClassPathOrderTest.java
@@ -0,0 +1,32 @@
+// Copyright 2021 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.build.classpath_order;
+
+import static org.junit.Assert.assertTrue;
+
+import androidx.test.filters.SmallTest;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.annotation.Config;
+
+import org.chromium.testing.local.LocalRobolectricTestRunner;
+
+/**
+ * Test that resources defined in different android_resources() targets but with the same
+ * package are accessible.
+ */
+@RunWith(LocalRobolectricTestRunner.class)
+@Config(manifest = Config.NONE)
+public final class ClassPathOrderTest {
+    @Test
+    @SmallTest
+    public void testAll() {
+        assertTrue(org.chromium.build.classpath_order.test1.R.integer.a1_dependency_resource >= 0);
+        assertTrue(org.chromium.build.classpath_order.test1.R.integer.z1_master_resource >= 0);
+        assertTrue(org.chromium.build.classpath_order.test2.R.integer.z2_dependency_resource >= 0);
+        assertTrue(org.chromium.build.classpath_order.test2.R.integer.a2_master_resource >= 0);
+    }
+}
diff --git a/third_party/libwebrtc/build/config/android/test/classpath_order/java/src/org/chromium/build/classpath_order/Dummy.java.jinja2 b/third_party/libwebrtc/build/config/android/test/classpath_order/java/src/org/chromium/build/classpath_order/Dummy.java.jinja2
new file mode 100644
index 0000000000..0ccf28b284
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/classpath_order/java/src/org/chromium/build/classpath_order/Dummy.java.jinja2
@@ -0,0 +1,8 @@
+// Copyright 2021 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.build.classpath_order;
+
+public class {{class_name}} {
+}
diff --git a/third_party/libwebrtc/build/config/android/test/proto/BUILD.gn b/third_party/libwebrtc/build/config/android/test/proto/BUILD.gn
new file mode 100644
index 0000000000..a28111a66a
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/proto/BUILD.gn
@@ -0,0 +1,103 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/android/rules.gni")
+import("//third_party/protobuf/proto_library.gni")
+
+# The purpose of these targets is test that |deps| satisfies java compilation
+# dependencies, and that |import_dirs| allows us to deal with various relative
+# imports to other proto dependencies. Although we should strive to avoid using
+# |import_dirs| and relative import paths, preferring to use absolute imports
+# whenever possible. See https://crbug.com/691451. While this target is
+# primarily to test that the Java proto targets build correctly, also build the
+# C++ versions of the protos as well. There are currently some configurations of
+# Java protos that can be built but will not work for C++, see
+# https://crbug.com/1039014, so make sure we don't create any tests that would
+# violate that.
+group("test_build_protos") {
+  deps = [
+    ":absolute_root_proto",
+    ":absolute_root_proto_java",
+    ":relative_root_proto",
+    ":relative_root_proto_java",
+  ]
+}
+
+proto_java_library("absolute_root_proto_java") {
+  proto_path = "//"
+  import_dirs = [ "relative_dep/" ]
+  sources = [
+    "root/absolute_child.proto",
+    "root/absolute_root.proto",
+  ]
+  deps = [
+    ":absolute_dep_proto_java",
+    ":relative_dep_proto_java",
+  ]
+}
+
+proto_java_library("relative_root_proto_java") {
+  proto_path = "root/"
+  import_dirs = [
+    "relative_dep/",
+    "//",
+  ]
+  sources = [
+    "root/relative_child.proto",
+    "root/relative_root.proto",
+  ]
+  deps = [
+    ":absolute_dep_proto_java",
+    ":relative_dep_proto_java",
+  ]
+}
+
+proto_java_library("absolute_dep_proto_java") {
+  proto_path = "//"
+  sources = [ "absolute_dep/absolute_dep.proto" ]
+}
+
+proto_java_library("relative_dep_proto_java") {
+  proto_path = "relative_dep/"
+  sources = [ "relative_dep/relative_dep.proto" ]
+}
+
+proto_library("absolute_root_proto") {
+  proto_in_dir = "//"
+  import_dirs = [ "relative_dep/" ]
+  sources = [
+    "root/absolute_child.proto",
+    "root/absolute_root.proto",
+  ]
+  link_deps = [
+    ":absolute_dep_proto",
+    ":relative_dep_proto",
+  ]
+}
+
+proto_library("relative_root_proto") {
+  proto_in_dir = "root/"
+  import_dirs = [
+    "relative_dep/",
+    "//",
+  ]
+  sources = [
+    "root/relative_child.proto",
+    "root/relative_root.proto",
+  ]
+  link_deps = [
+    ":absolute_dep_proto",
+    ":relative_dep_proto",
+  ]
+}
+
+proto_library("absolute_dep_proto") {
+  proto_in_dir = "//"
+  sources = [ "absolute_dep/absolute_dep.proto" ]
+}
+
+proto_library("relative_dep_proto") {
+  proto_in_dir = "relative_dep/"
+  sources = [ "relative_dep/relative_dep.proto" ]
+}
diff --git a/third_party/libwebrtc/build/config/android/test/proto/absolute_dep/absolute_dep.proto b/third_party/libwebrtc/build/config/android/test/proto/absolute_dep/absolute_dep.proto
new file mode 100644
index 0000000000..46dcce7679
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/proto/absolute_dep/absolute_dep.proto
@@ -0,0 +1,10 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+syntax = "proto2";
+
+package build.config.android.test;
+option java_package = "build.config.android.test";
+
+message AbsoluteDep {}
diff --git a/third_party/libwebrtc/build/config/android/test/proto/relative_dep/relative_dep.proto b/third_party/libwebrtc/build/config/android/test/proto/relative_dep/relative_dep.proto
new file mode 100644
index 0000000000..600b6ca7fe
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/proto/relative_dep/relative_dep.proto
@@ -0,0 +1,10 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+syntax = "proto2";
+
+package build.config.android.test;
+option java_package = "build.config.android.test";
+
+message RelativeDep {}
diff --git a/third_party/libwebrtc/build/config/android/test/proto/root/absolute_child.proto b/third_party/libwebrtc/build/config/android/test/proto/root/absolute_child.proto
new file mode 100644
index 0000000000..d6a6a13f36
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/proto/root/absolute_child.proto
@@ -0,0 +1,10 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+syntax = "proto2";
+
+package build.config.android.test;
+option java_package = "build.config.android.test";
+
+message AbsoluteChild {}
diff --git a/third_party/libwebrtc/build/config/android/test/proto/root/absolute_root.proto b/third_party/libwebrtc/build/config/android/test/proto/root/absolute_root.proto
new file mode 100644
index 0000000000..3e200978d9
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/proto/root/absolute_root.proto
@@ -0,0 +1,18 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+syntax = "proto2";
+
+package build.config.android.test;
+option java_package = "build.config.android.test";
+
+import "build/config/android/test/proto/root/absolute_child.proto";
+import "build/config/android/test/proto/absolute_dep/absolute_dep.proto";
+import "relative_dep.proto";
+
+message AbsoluteRoot {
+  optional AbsoluteChild absolute_child = 1;
+  optional AbsoluteDep absolute_dep = 2;
+  optional RelativeDep relative_dep = 3;
+}
diff --git a/third_party/libwebrtc/build/config/android/test/proto/root/relative_child.proto b/third_party/libwebrtc/build/config/android/test/proto/root/relative_child.proto
new file mode 100644
index 0000000000..10f7ed4277
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/proto/root/relative_child.proto
@@ -0,0 +1,10 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+syntax = "proto2";
+
+package build.config.android.test;
+option java_package = "build.config.android.test";
+
+message RelativeChild {}
diff --git a/third_party/libwebrtc/build/config/android/test/proto/root/relative_root.proto b/third_party/libwebrtc/build/config/android/test/proto/root/relative_root.proto
new file mode 100644
index 0000000000..a37a268b4f
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/proto/root/relative_root.proto
@@ -0,0 +1,18 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+syntax = "proto2";
+
+package build.config.android.test;
+option java_package = "build.config.android.test";
+
+import "relative_child.proto";
+import "build/config/android/test/proto/absolute_dep/absolute_dep.proto";
+import "relative_dep.proto";
+
+message RelativeRoot {
+  optional RelativeChild relative_child = 1;
+  optional AbsoluteDep absolute_dep = 2;
+  optional RelativeDep relative_dep = 3;
+}
diff --git a/third_party/libwebrtc/build/config/android/test/resource_overlay/BUILD.gn b/third_party/libwebrtc/build/config/android/test/resource_overlay/BUILD.gn
new file mode 100644
index 0000000000..4a063d2215
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/resource_overlay/BUILD.gn
@@ -0,0 +1,60 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/android/rules.gni")
+
+# Tests for 'resource_overlay' parameter in android_resources() template.
+
+template("test_resources") {
+  jinja_template_resources(target_name) {
+    forward_variables_from(invoker, "*")
+    testonly = true
+    variables = [
+      "resource_name=$resource_name",
+      "resource_value=$resource_value",
+    ]
+    res_dir = "java/res_template"
+    resources = [ "java/res_template/values/values.xml" ]
+  }
+}
+
+test_resources("dependency_tagged_dependency_resources") {
+  resource_overlay = true
+  resource_name = "resource_overlay_dependency_tagged_secret"
+  resource_value = 41
+}
+
+test_resources("dependency_tagged_root_resources") {
+  resource_name = "resource_overlay_dependency_tagged_secret"
+  resource_value = 42
+  deps = [ ":dependency_tagged_dependency_resources" ]
+}
+
+test_resources("root_tagged_dependency_resources") {
+  resource_name = "resource_overlay_root_tagged_secret"
+  resource_value = 41
+}
+
+test_resources("root_tagged_root_resources") {
+  resource_overlay = true
+  resource_name = "resource_overlay_root_tagged_secret"
+  resource_value = 42
+  deps = [ ":root_tagged_dependency_resources" ]
+}
+
+android_library("javatests") {
+  testonly = true
+  sources = [
+    "java/src/org/chromium/build/resource_overlay/ResourceOverlayTest.java",
+  ]
+  resources_package = "org.chromium.build.resource_overlay"
+  deps = [
+    ":dependency_tagged_root_resources",
+    ":root_tagged_root_resources",
+    "//base:base_java_test_support",
+    "//third_party/android_support_test_runner:runner_java",
+    "//third_party/androidx:androidx_test_runner_java",
+    "//third_party/junit",
+  ]
+}
diff --git a/third_party/libwebrtc/build/config/android/test/resource_overlay/java/res_template/values/values.xml b/third_party/libwebrtc/build/config/android/test/resource_overlay/java/res_template/values/values.xml
new file mode 100644
index 0000000000..973f855206
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/resource_overlay/java/res_template/values/values.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2020 The Chromium Authors. All rights reserved.
+
+     Use of this source code is governed by a BSD-style license that can be
+     found in the LICENSE file.
+-->
+
+<resources xmlns:android="http://schemas.android.com/apk/res/android">
+    <integer name="{{resource_name}}">{{resource_value}}</integer>
+</resources>
\ No newline at end of file
diff --git a/third_party/libwebrtc/build/config/android/test/resource_overlay/java/src/org/chromium/build/resource_overlay/ResourceOverlayTest.java b/third_party/libwebrtc/build/config/android/test/resource_overlay/java/src/org/chromium/build/resource_overlay/ResourceOverlayTest.java
new file mode 100644
index 0000000000..794cafac53
--- /dev/null
+++ b/third_party/libwebrtc/build/config/android/test/resource_overlay/java/src/org/chromium/build/resource_overlay/ResourceOverlayTest.java
@@ -0,0 +1,49 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.build.resource_overlay;
+
+import static org.junit.Assert.assertEquals;
+
+import android.content.res.Resources;
+import android.support.test.InstrumentationRegistry;
+
+import androidx.test.filters.SmallTest;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.chromium.base.test.BaseJUnit4ClassRunner;
+import org.chromium.base.test.util.Batch;
+
+/**
+ * Test for resource_overlay parameter in android_resources() build rule.
+ */
+@RunWith(BaseJUnit4ClassRunner.class)
+@Batch(Batch.UNIT_TESTS)
+public class ResourceOverlayTest {
+    /**
+     * Test that when an android_resources() target with resource_overlay=false has a resource with
+     * the same name but a different value as a dependency with resource_overlay=true that the value
+     * of the resource in the dependency is used.
+     */
+    @Test
+    @SmallTest
+    public void testDependencyTagged() {
+        Resources resources = InstrumentationRegistry.getTargetContext().getResources();
+        assertEquals(41, resources.getInteger(R.integer.resource_overlay_dependency_tagged_secret));
+    }
+
+    /**
+     * Test that when an android_resources() target with resource_overlay=true has a resource with
+     * the same name but different value as one of its dependencies that the value of resource in
+     * the target with resource_overlay=true is used.
+     */
+    @Test
+    @SmallTest
+    public void testRootTagged() {
+        Resources resources = InstrumentationRegistry.getTargetContext().getResources();
+        assertEquals(42, resources.getInteger(R.integer.resource_overlay_root_tagged_secret));
+    }
+}
diff --git a/third_party/libwebrtc/build/config/apple/OWNERS b/third_party/libwebrtc/build/config/apple/OWNERS
new file mode 100644
index 0000000000..6f3324f07c
--- /dev/null
+++ b/third_party/libwebrtc/build/config/apple/OWNERS
@@ -0,0 +1 @@
+file://build/apple/OWNERS
diff --git a/third_party/libwebrtc/build/config/apple/sdk_info.py b/third_party/libwebrtc/build/config/apple/sdk_info.py
new file mode 100644
index 0000000000..fea680101b
--- /dev/null
+++ b/third_party/libwebrtc/build/config/apple/sdk_info.py
@@ -0,0 +1,177 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from __future__ import print_function
+
+import argparse
+import doctest
+import itertools
+import os
+import plistlib
+import re
+import subprocess
+import sys
+
+if sys.version_info.major < 3:
+  basestring_compat = basestring
+else:
+  basestring_compat = str
+
+# src directory
+ROOT_SRC_DIR = os.path.dirname(
+    os.path.dirname(os.path.dirname(os.path.dirname(
+        os.path.realpath(__file__)))))
+
+# This script prints information about the build system, the operating
+# system and the iOS or Mac SDK (depending on the platform "iphonesimulator",
+# "iphoneos" or "macosx" generally).
+
+
+def LoadPList(path):
+  """Loads Plist at |path| and returns it as a dictionary."""
+  # Cloned from //build/apple/plist_util.py.
+  if sys.version_info.major == 2:
+    return plistlib.readPlist(path)
+  with open(path, 'rb') as f:
+    return plistlib.load(f)
+
+
+def SplitVersion(version):
+  """Splits the Xcode version to 3 values.
+
+  >>> list(SplitVersion('8.2.1.1'))
+  ['8', '2', '1']
+  >>> list(SplitVersion('9.3'))
+  ['9', '3', '0']
+  >>> list(SplitVersion('10.0'))
+  ['10', '0', '0']
+  """
+  version = version.split('.')
+  return itertools.islice(itertools.chain(version, itertools.repeat('0')), 0, 3)
+
+
+def FormatVersion(version):
+  """Converts Xcode version to a format required for DTXcode in Info.plist
+
+  >>> FormatVersion('8.2.1')
+  '0821'
+  >>> FormatVersion('9.3')
+  '0930'
+  >>> FormatVersion('10.0')
+  '1000'
+  """
+  major, minor, patch = SplitVersion(version)
+  return ('%2s%s%s' % (major, minor, patch)).replace(' ', '0')
+
+
+def FillXcodeVersion(settings, developer_dir):
+  """Fills the Xcode version and build number into |settings|."""
+  if developer_dir:
+    xcode_version_plist_path = os.path.join(developer_dir,
+                                            'Contents/version.plist')
+    version_plist = LoadPList(xcode_version_plist_path)
+    settings['xcode_version'] = FormatVersion(
+        version_plist['CFBundleShortVersionString'])
+    settings['xcode_version_int'] = int(settings['xcode_version'], 10)
+    settings['xcode_build'] = version_plist['ProductBuildVersion']
+    return
+
+  lines = subprocess.check_output(['xcodebuild',
+                                   '-version']).decode('UTF-8').splitlines()
+  settings['xcode_version'] = FormatVersion(lines[0].split()[-1])
+  settings['xcode_version_int'] = int(settings['xcode_version'], 10)
+  settings['xcode_build'] = lines[-1].split()[-1]
+
+
+def FillMachineOSBuild(settings):
+  """Fills OS build number into |settings|."""
+  machine_os_build = subprocess.check_output(['sw_vers', '-buildVersion'
+                                              ]).decode('UTF-8').strip()
+  settings['machine_os_build'] = machine_os_build
+
+
+def FillSDKPathAndVersion(settings, platform, xcode_version):
+  """Fills the SDK path and version for |platform| into |settings|."""
+  settings['sdk_path'] = subprocess.check_output(
+      ['xcrun', '-sdk', platform, '--show-sdk-path']).decode('UTF-8').strip()
+  settings['sdk_version'] = subprocess.check_output(
+      ['xcrun', '-sdk', platform,
+       '--show-sdk-version']).decode('UTF-8').strip()
+  settings['sdk_platform_path'] = subprocess.check_output(
+      ['xcrun', '-sdk', platform,
+       '--show-sdk-platform-path']).decode('UTF-8').strip()
+  settings['sdk_build'] = subprocess.check_output(
+      ['xcrun', '-sdk', platform,
+       '--show-sdk-build-version']).decode('UTF-8').strip()
+  settings['toolchains_path'] = os.path.join(
+      subprocess.check_output(['xcode-select',
+                               '-print-path']).decode('UTF-8').strip(),
+      'Toolchains/XcodeDefault.xctoolchain')
+
+
+def CreateXcodeSymlinkAt(src, dst):
+  """Create symlink to Xcode directory at target location."""
+
+  if not os.path.isdir(dst):
+    os.makedirs(dst)
+
+  dst = os.path.join(dst, os.path.basename(src))
+  updated_value = '//' + os.path.relpath(dst, ROOT_SRC_DIR)
+
+  # Update the symlink only if it is different from the current destination.
+  if os.path.islink(dst):
+    current_src = os.readlink(dst)
+    if current_src == src:
+      return updated_value
+    os.unlink(dst)
+    sys.stderr.write('existing symlink %s points %s; want %s. Removed.' %
+                     (dst, current_src, src))
+  os.symlink(src, dst)
+  return updated_value
+
+
+if __name__ == '__main__':
+  doctest.testmod()
+
+  parser = argparse.ArgumentParser()
+  parser.add_argument("--developer_dir", dest="developer_dir", required=False)
+  parser.add_argument("--get_sdk_info",
+                      action="store_true",
+                      dest="get_sdk_info",
+                      default=False,
+                      help="Returns SDK info in addition to xcode info.")
+  parser.add_argument("--get_machine_info",
+                      action="store_true",
+                      dest="get_machine_info",
+                      default=False,
+                      help="Returns machine info in addition to xcode info.")
+  parser.add_argument("--create_symlink_at",
+                      action="store",
+                      dest="create_symlink_at",
+                      help="Create symlink of SDK at given location and "
+                      "returns the symlinked paths as SDK info instead "
+                      "of the original location.")
+  args, unknownargs = parser.parse_known_args()
+  if args.developer_dir:
+    os.environ['DEVELOPER_DIR'] = args.developer_dir
+
+  if len(unknownargs) != 1:
+    sys.stderr.write('usage: %s [iphoneos|iphonesimulator|macosx]\n' %
+                     os.path.basename(sys.argv[0]))
+    sys.exit(1)
+
+  settings = {}
+  if args.get_machine_info:
+    FillMachineOSBuild(settings)
+  FillXcodeVersion(settings, args.developer_dir)
+  if args.get_sdk_info:
+    FillSDKPathAndVersion(settings, unknownargs[0], settings['xcode_version'])
+
+  for key in sorted(settings):
+    value = settings[key]
+    if args.create_symlink_at and '_path' in key:
+      value = CreateXcodeSymlinkAt(value, args.create_symlink_at)
+    if isinstance(value, basestring_compat):
+      value = '"%s"' % value
+    print('%s=%s' % (key, value))
diff --git a/third_party/libwebrtc/build/config/apple/symbols.gni b/third_party/libwebrtc/build/config/apple/symbols.gni
new file mode 100644
index 0000000000..dd1d796fa6
--- /dev/null
+++ b/third_party/libwebrtc/build/config/apple/symbols.gni
@@ -0,0 +1,30 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chrome_build.gni")
+import("//build/config/sanitizers/sanitizers.gni")
+
+# This file declares arguments and configs that control whether dSYM debug
+# info is produced and whether build products are stripped.
+
+declare_args() {
+  # Produce dSYM files for targets that are configured to do so. dSYM
+  # generation is controlled globally as it is a linker output (produced via
+  # the //build/toolchain/apple/linker_driver.py. Enabling this will result in
+  # all shared library, loadable module, and executable targets having a dSYM
+  # generated.
+  enable_dsyms = is_official_build || using_sanitizer
+
+  # Strip symbols from linked targets by default. If this is enabled, the
+  # //build/config/mac:strip_all config will be applied to all linked targets.
+  # If custom stripping parameters are required, remove that config from a
+  # linked target and apply custom -Wcrl,strip flags. See
+  # //build/toolchain/apple/linker_driver.py for more information.
+  enable_stripping = is_official_build
+}
+
+# Save unstripped copies of targets with a ".unstripped" suffix. This is
+# useful to preserve the original output when enable_stripping=true but
+# we're not actually generating real dSYMs.
+save_unstripped_output = enable_stripping && !enable_dsyms
diff --git a/third_party/libwebrtc/build/config/arm.gni b/third_party/libwebrtc/build/config/arm.gni
new file mode 100644
index 0000000000..a0ada42453
--- /dev/null
+++ b/third_party/libwebrtc/build/config/arm.gni
@@ -0,0 +1,136 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/v8_target_cpu.gni")
+
+# These are primarily relevant in target_cpu == "arm" contexts, where
+# ARM code is being compiled.  But they can also be relevant in the
+# other contexts when the code will change its behavior based on the
+# cpu it wants to generate code for.
+if (target_cpu == "arm" || v8_target_cpu == "arm") {
+  declare_args() {
+    # Version of the ARM processor when compiling on ARM. Ignored on non-ARM
+    # platforms.
+    arm_version = 7
+
+    # The ARM architecture. This will be a string like "armv6" or "armv7-a".
+    # An empty string means to use the default for the arm_version.
+    arm_arch = ""
+
+    # The ARM floating point hardware. This will be a string like "neon" or
+    # "vfpv3". An empty string means to use the default for the arm_version.
+    arm_fpu = ""
+
+    # The ARM variant-specific tuning mode. This will be a string like "armv6"
+    # or "cortex-a15". An empty string means to use the default for the
+    # arm_version.
+    arm_tune = ""
+
+    # Whether to use the neon FPU instruction set or not.
+    arm_use_neon = ""
+
+    # Whether to enable optional NEON code paths.
+    arm_optionally_use_neon = false
+
+    # Thumb is a reduced instruction set available on some ARM processors that
+    # has increased code density.
+    arm_use_thumb = true
+  }
+
+  if (current_os == "android" || target_os == "android") {
+    arm_float_abi = "softfp"
+  } else {
+    declare_args() {
+      # The ARM floating point mode. This is either the string "hard", "soft",
+      # or "softfp". An empty string means to use the default one for the
+      # arm_version.
+      arm_float_abi = ""
+    }
+  }
+  assert(arm_float_abi == "" || arm_float_abi == "hard" ||
+         arm_float_abi == "soft" || arm_float_abi == "softfp")
+
+  if (arm_use_neon == "") {
+    if (current_os == "linux" && target_cpu != v8_target_cpu) {
+      # Don't use neon on V8 simulator builds as a default.
+      arm_use_neon = false
+    } else {
+      arm_use_neon = true
+    }
+  }
+
+  if (arm_version == 6) {
+    if (arm_arch == "") {
+      arm_arch = "armv6"
+    }
+    if (arm_tune != "") {
+      arm_tune = ""
+    }
+    if (arm_float_abi == "") {
+      arm_float_abi = "softfp"
+    }
+    if (arm_fpu == "") {
+      arm_fpu = "vfp"
+    }
+    arm_use_thumb = false
+    arm_use_neon = false
+  } else if (arm_version == 7) {
+    if (arm_arch == "") {
+      arm_arch = "armv7-a"
+    }
+    if (arm_tune == "") {
+      arm_tune = "generic-armv7-a"
+    }
+
+    if (arm_float_abi == "") {
+      if (current_os == "linux" && target_cpu != v8_target_cpu) {
+        # Default to the same as Android for V8 simulator builds.
+        arm_float_abi = "softfp"
+      } else {
+        arm_float_abi = "hard"
+      }
+    }
+
+    if (arm_fpu == "") {
+      if (arm_use_neon) {
+        arm_fpu = "neon"
+      } else {
+        arm_fpu = "vfpv3-d16"
+      }
+    }
+  } else if (arm_version == 8) {
+    if (arm_arch == "") {
+      arm_arch = "armv8-a"
+    }
+    if (arm_tune == "") {
+      arm_tune = "generic-armv8-a"
+    }
+
+    if (arm_float_abi == "") {
+      arm_float_abi = "hard"
+    }
+
+    if (arm_fpu == "") {
+      if (arm_use_neon) {
+        arm_fpu = "neon"
+      } else {
+        arm_fpu = "vfpv3-d16"
+      }
+    }
+  }
+} else if (target_cpu == "arm64" || v8_target_cpu == "arm64") {
+  # arm64 supports only "hard".
+  arm_float_abi = "hard"
+  arm_use_neon = true
+  declare_args() {
+    # Enables the new Armv8 branch protection features. Valid strings are:
+    # - "standard": Enables both Pointer Authentication Code (featured in
+    #               Armv8.3) and Branch Target Identification (Armv8.5).
+    # - "none": No branch protection.
+    arm_control_flow_integrity = "none"
+  }
+  assert(arm_control_flow_integrity == "none" ||
+             arm_control_flow_integrity == "standard",
+         "Invalid branch protection option")
+}
diff --git a/third_party/libwebrtc/build/config/buildflags_paint_preview.gni b/third_party/libwebrtc/build/config/buildflags_paint_preview.gni
new file mode 100644
index 0000000000..7129e76634
--- /dev/null
+++ b/third_party/libwebrtc/build/config/buildflags_paint_preview.gni
@@ -0,0 +1,16 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chromecast_build.gni")
+import("//build/config/features.gni")
+
+declare_args() {
+  # Enable basic paint preview support. Does not work on iOS or Fuchsia. Should
+  # not be included with Chromecast. Not ready for shipping builds yet so
+  # include in unofficial builds.
+  # Used by //components/paint_preview and //third_party/harfbuzz-ng.
+  # TODO(bug/webrtc:11223) Move back this file in //components/paint_preview/
+  #     once WebRTC doesn't roll harfbuzz-ng anymore, for consistency sake.
+  enable_paint_preview = !is_chromecast && !is_ios && !is_fuchsia
+}
diff --git a/third_party/libwebrtc/build/config/c++/BUILD.gn b/third_party/libwebrtc/build/config/c++/BUILD.gn
new file mode 100644
index 0000000000..e7ed69ec81
--- /dev/null
+++ b/third_party/libwebrtc/build/config/c++/BUILD.gn
@@ -0,0 +1,145 @@
+import("//build/config/c++/c++.gni")
+import("//build/config/chrome_build.gni")
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/config/dcheck_always_on.gni")
+import("//buildtools/deps_revisions.gni")
+
+assert(use_custom_libcxx, "should only be used if use_custom_libcxx is set")
+
+declare_args() {
+  # lldb pretty printing only works when libc++ is built in the __1 (or __ndk1)
+  # namespaces.  For pretty printing to work out-of-the-box on Mac (where lldb
+  # is primarily used), this flag is set to false to build with the __1
+  # namespace (to maintain ABI compatibility, this implies building without
+  # _LIBCPP_ABI_UNSTABLE).  This is not necessary on non-component builds
+  # because we leave the ABI version set to __1 in that case because libc++
+  # symbols are not exported.
+  # TODO(thomasanderson): Set this to true by default once rL352899 is available
+  # in MacOS's lldb.
+  libcxx_abi_unstable = !(is_apple && is_debug && is_component_build)
+}
+
+# TODO(xiaohuic): https://crbug/917533 Crashes on internal ChromeOS build.
+# Do unconditionally once the underlying problem is fixed.
+if (is_chromeos_ash && is_chrome_branded) {
+  libcxx_abi_unstable = false
+}
+
+# This is included by reference in the //build/config/compiler:runtime_library
+# config that is applied to all targets. It is here to separate out the logic
+# that is specific to libc++. Please see that target for advice on what should
+# go in :runtime_library vs. :compiler.
+config("runtime_library") {
+  cflags = []
+  cflags_cc = []
+  defines = []
+  include_dirs = []
+  ldflags = []
+  libs = []
+
+  if (libcxx_abi_unstable) {
+    defines += [ "_LIBCPP_ABI_UNSTABLE" ]
+  }
+
+  if (libcxx_is_shared) {
+    # When libcxx_is_shared is true, symbols from libc++.so are exported for
+    # all DSOs to use.  If the system libc++ gets loaded (indirectly through
+    # a system library), then it will conflict with our libc++.so.  Add a
+    # custom ABI version if we're building with _LIBCPP_ABI_UNSTABLE to avoid
+    # conflicts.
+    #
+    # Windows doesn't need to set _LIBCPP_ABI_VERSION since there's no system
+    # C++ library we could conflict with.
+    if (libcxx_abi_unstable && !is_win) {
+      defines += [ "_LIBCPP_ABI_VERSION=Cr" ]
+    }
+  } else {
+    # Don't leak any symbols on a static build.
+    defines += [ "_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS" ]
+    if (!export_libcxxabi_from_executables && !is_win) {
+      defines += [ "_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS" ]
+    }
+  }
+
+  defines += [ "_LIBCPP_ENABLE_NODISCARD" ]
+
+  include_dirs += [ "//buildtools/third_party/libc++" ]
+
+  # Work around a symbol conflict between GRPC and the Fuchsia SDK.
+  # TODO(crbug.com/1166970): Remove this when resolved.
+  if (is_fuchsia) {
+    defines += [ "_LIBCPP_NO_NATIVE_SEMAPHORES" ]
+  }
+
+  # The Windows component build fails to link with libc++'s debug mode. See
+  # https://crbug.com/923166#c33, https://crbug.com/923166#c44, and
+  # https://llvm.org/PR41018.
+  if (!(is_win && is_component_build)) {
+    # libc++ has two levels of debug mode. Setting _LIBCPP_DEBUG to zero
+    # enables most assertions. Setting it to one additionally enables iterator
+    # debugging. See https://libcxx.llvm.org/docs/DesignDocs/DebugMode.html
+    if (enable_iterator_debugging) {
+      defines += [ "_LIBCPP_DEBUG=1" ]
+    } else if (is_debug || dcheck_always_on) {
+      defines += [ "_LIBCPP_DEBUG=0" ]
+    }
+  }
+
+  if (is_win) {
+    # Intentionally not using libc++abi on Windows because libc++abi only
+    # implements the Itanium C++ ABI, and not the Microsoft ABI which we use on
+    # Windows (and we need to use in order to interoperate correctly with COM
+    # among other things).
+    assert(!export_libcxxabi_from_executables,
+           "Don't use libcxxabi on Windows.")
+
+    cflags_cc +=
+        [ "-I" + rebase_path("$libcxx_prefix/include", root_build_dir) ]
+
+    # Prevent libc++ from embedding linker flags to try to automatically link
+    # against its runtime library. This is unnecessary with our build system,
+    # and can also result in build failures if libc++'s name for a library
+    # does not match ours.
+    defines += [ "_LIBCPP_NO_AUTO_LINK" ]
+
+    # Add a debug visualizer for Microsoft's debuggers so that they can display
+    # libc++ types well.
+    if (libcxx_natvis_include) {
+      # chrome.natvis listed as an input in //buildtools/third_party/libc++ to
+      # guarantee relinking on changes.
+      ldflags += [ "/NATVIS:" + rebase_path("libc++.natvis", root_build_dir) ]
+    }
+  } else {
+    cflags_cc += [
+      "-nostdinc++",
+      "-isystem" + rebase_path("$libcxx_prefix/include", root_build_dir),
+      "-isystem" + rebase_path("$libcxxabi_prefix/include", root_build_dir),
+    ]
+    cflags_objcc = cflags_cc
+
+    defines += [ "CR_LIBCXX_REVISION=$libcxx_revision" ]
+
+    # Make sure we don't link against the system libstdc++ or libc++.
+    if (is_clang) {
+      ldflags += [ "-nostdlib++" ]
+    } else {
+      # Gcc has a built-in abs() definition with default visibility.
+      # If it was not disabled, it would conflict with libc++'s abs()
+      # with hidden visibility.
+      cflags += [ "-fno-builtin-abs" ]
+
+      ldflags += [ "-nodefaultlibs" ]
+
+      # Unfortunately, there's no way to disable linking against just libc++
+      # (gcc doesn't have -notstdlib++:
+      # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83931); -nodefaultlibs
+      # removes all of the default libraries, so add back the ones that we need.
+      libs += [
+        "c",
+        "gcc_s",
+        "m",
+        "rt",
+      ]
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/c++/c++.gni b/third_party/libwebrtc/build/config/c++/c++.gni
new file mode 100644
index 0000000000..10a780c19b
--- /dev/null
+++ b/third_party/libwebrtc/build/config/c++/c++.gni
@@ -0,0 +1,81 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/config/sanitizers/sanitizers.gni")
+
+declare_args() {
+  # Use in-tree libc++ (buildtools/third_party/libc++ and
+  # buildtools/third_party/libc++abi) instead of the system C++ library for C++
+  # standard library support.
+  # Don't check in changes that set this to false for more platforms; doing so
+  # is not supported.
+  use_custom_libcxx =
+      is_fuchsia || is_android || is_mac || is_linux || is_chromeos_lacros ||
+      (is_ios && !use_xcode_clang) || (is_win && is_clang) ||
+      (is_chromeos && default_toolchain != "//build/toolchain/cros:target")
+
+  # Use libc++ instead of stdlibc++ when using the host_cpu toolchain, even if
+  # use_custom_libcxx is false. This is useful for cross-compiles where a custom
+  # toolchain for the target_cpu has been set as the default toolchain, but
+  # use_custom_libcxx should still be true when building for the host.  The
+  # expected usage is to set use_custom_libcxx=false and
+  # use_custom_libcxx_for_host=true in the passed in buildargs.
+  use_custom_libcxx_for_host = false
+
+  # Builds libcxx Natvis into the symbols for type visualization.
+  # Set to false to workaround http://crbug.com/966676 and
+  # http://crbug.com/966687.
+  libcxx_natvis_include = true
+
+  # When set, enables libc++ debug mode with iterator debugging.
+  #
+  # Iterator debugging is generally useful for catching bugs. But it can
+  # introduce extra locking to check the state of an iterator against the state
+  # of the current object. For iterator- and thread-heavy code, this can
+  # significantly slow execution - two orders of magnitude slowdown has been
+  # seen (crbug.com/903553) and iterator debugging also slows builds by making
+  # generation of snapshot_blob.bin take ~40-60 s longer. Therefore this
+  # defaults to off.
+  enable_iterator_debugging = false
+}
+
+use_custom_libcxx =
+    use_custom_libcxx || (use_custom_libcxx_for_host && !is_a_target_toolchain)
+use_custom_libcxx = use_custom_libcxx && !is_nacl
+
+declare_args() {
+  # WARNING: Setting this to a non-default value is highly discouraged.
+  # If true, libc++ will be built as a shared library; otherwise libc++ will be
+  # linked statically. Setting this to something other than the default is
+  # unsupported and can be broken by libc++ rolls. Note that if this is set to
+  # true, you must also set libcxx_abi_unstable=false, which is bad for
+  # performance and memory use.
+  libcxx_is_shared = use_custom_libcxx && is_component_build
+}
+
+# libc++abi needs to be exported from executables to be picked up by shared
+# libraries on certain instrumented builds.
+export_libcxxabi_from_executables =
+    use_custom_libcxx && !is_apple && !is_win && !is_component_build &&
+    (is_asan || is_ubsan_vptr)
+
+# On Android, many shared libraries get loaded from the context of a JRE.  In
+# this case, there's no "main executable" to export libc++abi from.  We could
+# export libc++abi from each "toplevel" shared library instead, but that would
+# require adding an explicit dependency for each one, and might introduce
+# subtle, hard-to-fix problems down the line if the dependency is missing.
+#
+# export_libcxxabi_from_executables was added to avoid having an RPATH set in
+# static sanitizer builds just for executables to find libc++.  But on Android,
+# the Bionic dynamic loader doesn't even look at RPATH; instead, LD_LIBRARY_PATH
+# is set for tests. Because of this, we make libc++ a shared library on android
+# since it should get loaded properly.
+if (is_android && export_libcxxabi_from_executables) {
+  export_libcxxabi_from_executables = false
+  libcxx_is_shared = true
+}
+
+libcxx_prefix = "//buildtools/third_party/libc++/trunk"
+libcxxabi_prefix = "//buildtools/third_party/libc++abi/trunk"
diff --git a/third_party/libwebrtc/build/config/c++/libc++.natvis b/third_party/libwebrtc/build/config/c++/libc++.natvis
new file mode 100644
index 0000000000..9a49a2935a
--- /dev/null
+++ b/third_party/libwebrtc/build/config/c++/libc++.natvis
@@ -0,0 +1,435 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<AutoVisualizer
+  xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+
+  <!-- libc++'s __compressed_pair is an internal type used pervasively for
+       doing the empty base class optimization.
+
+       __compressed_pair<U,V> derives from __compressed_pair_elem<U,0> and
+       __compressed_pair_elem<V,1>. __compressed_pair_elem<T> is specialized on
+       a 3rd template parameter:
+       * if T is empty and non-final the 3rd param is 1 and it derives from T
+       * else it has a member variable __value_ of type T
+  -->
+  <Type Name="std::__1::__compressed_pair_elem&lt;*,*,0&gt;">
+    <DisplayString>{__value_}</DisplayString>
+    <Expand>
+      <ExpandedItem>__value_</ExpandedItem>
+    </Expand>
+  </Type>
+  <Type Name="std::__1::__compressed_pair_elem&lt;*,*,1&gt;">
+    <DisplayString>{*($T1*)this}</DisplayString>
+    <Expand>
+      <ExpandedItem>*($T1*)this</ExpandedItem>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::array&lt;*,*&gt;">
+    <DisplayString>{{ size={$T2} }}</DisplayString>
+    <Expand>
+      <ArrayItems>
+        <Size>$T2</Size>
+        <ValuePointer>__elems_</ValuePointer>
+      </ArrayItems>
+    </Expand>
+  </Type>
+
+  <!--libc++'s short string optimization:
+      A basic_string is 3 size_t words long. In the "alternate string layout"
+      that we use, they are: pointer to data, size, capacity.
+      (In the normal layout, it's capacity, size, data instead.)
+      If a string is short enough that it fits in these three size_ts instead,
+      the string data is stored inline in these 3 words, with the last byte of
+      the storage storing the length of the string.
+      The highest bit of the "capacity" word is set for normal, "long" strings,
+      and that bit needs to be masked out to know the real capacity.
+      If this bit is not set, the string data is stored inline.
+      (In the normal layout, if the lowest bit in the first byte is set,
+      it's a "long" string, requiring a long string to always have even
+      capacity. A short string here stores its length in the first byte
+      and the inline data in the remaining storage.)
+  -->
+
+  <Type Name="std::__1::basic_string&lt;char,*&gt;">
+    <!--<Intrinsic Name="is_long"
+            Expression="((__rep*)&amp;__r_)-&gt;__s.__size_ &amp; 0x80" />-->
+    <!-- The above doesn't work because of https://llvm.org/PR41615
+         TODO(thakis): Now that we have clang r362038, try the above approach
+                       again.
+         The below assumes the alternate string layout and little endianness :/
+    -->
+    <Intrinsic Name="is_long"
+        Expression="*(((char*)this) + 3*sizeof(size_t) - 1) &amp; 0x80" />
+    <DisplayString Condition="is_long()">{*(char**)this}</DisplayString>
+    <DisplayString Condition="!is_long()">{(char*)this}</DisplayString>
+    <StringView Condition="is_long()">*(char**)this</StringView>
+    <StringView Condition="!is_long()">(char*)this</StringView>
+    <Expand>
+      <Item Name="[size]" Condition="is_long()"
+          ExcludeView="simple">((size_t*)this)[1]</Item>
+      <Item Name="[size]" Condition="!is_long()"
+          ExcludeView="simple">*(((char*)this) + 3*sizeof(size_t) - 1)</Item>
+      <Item Name="[capacity]" Condition="is_long()" ExcludeView="simple">
+        ((size_t*)this)[2] &amp; (~((size_t)0) &gt;&gt; 1)
+      </Item>
+      <Item Name="[capacity]" Condition="!is_long()"
+          ExcludeView="simple">22</Item>
+      <ArrayItems>
+        <Size Condition="is_long()">((size_t*)this)[1]</Size>
+        <Size Condition="!is_long()">
+          *(((char*)this) + 3*sizeof(size_t) - 1)
+        </Size>
+        <ValuePointer Condition="is_long()">*(char**)this</ValuePointer>
+        <ValuePointer Condition="!is_long()">(char*)this</ValuePointer>
+      </ArrayItems>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::basic_string&lt;wchar_t,*&gt;">
+    <Intrinsic Name="is_long"
+        Expression="*(((char*)this) + 3*sizeof(size_t) - 1) &amp; 0x80" />
+    <DisplayString Condition="is_long()">{*(wchar_t**)this}</DisplayString>
+    <DisplayString Condition="!is_long()">{(wchar_t*)this}</DisplayString>
+    <StringView Condition="is_long()">*(wchar_t**)this</StringView>
+    <StringView Condition="!is_long()">(wchar_t*)this</StringView>
+    <Expand>
+      <Item Name="[size]" Condition="is_long()"
+          ExcludeView="simple">((size_t*)this)[1]</Item>
+      <Item Name="[size]" Condition="!is_long()"
+          ExcludeView="simple">*(((char*)this) + 3*sizeof(size_t) - 1)</Item>
+      <Item Name="[capacity]" Condition="is_long()" ExcludeView="simple">
+        ((size_t*)this)[2] &amp; (~((size_t)0) &gt;&gt; 1)
+      </Item>
+      <Item Name="[capacity]" Condition="!is_long()"
+          ExcludeView="simple">10</Item>
+      <ArrayItems>
+        <Size Condition="is_long()">((size_t*)this)[1]</Size>
+        <Size Condition="!is_long()">
+          *(((char*)this) + 3*sizeof(size_t) - 1)
+        </Size>
+        <ValuePointer Condition="is_long()">*(wchar_t**)this</ValuePointer>
+        <ValuePointer Condition="!is_long()">(wchar_t*)this</ValuePointer>
+      </ArrayItems>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::deque&lt;*,*&gt;">
+    <Intrinsic Name="size" Expression="*(size_type*)&amp;__size_" />
+    <Intrinsic Name="block_size"
+        Expression="sizeof($T1) &lt; 256 ? 4096 / sizeof($T1) : 16" />
+    <DisplayString>{{ size={size()} }}</DisplayString>
+    <Expand>
+      <IndexListItems>
+        <Size>size()</Size>
+        <ValueNode>
+          *(*(__map_.__begin_ + ($i + __start_) / block_size()) +
+                                ($i + __start_) % block_size())
+        </ValueNode>
+      </IndexListItems>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::forward_list&lt;*&gt;">
+    <Intrinsic Name="head"
+        Expression="((__node_pointer)&amp;__before_begin_)-&gt;__next_" />
+    <DisplayString Condition="head() == 0">empty</DisplayString>
+    <DisplayString Condition="head() != 0">non-empty</DisplayString>
+    <Expand>
+      <LinkedListItems>
+        <HeadPointer>head()</HeadPointer>
+        <NextPointer>__next_</NextPointer>
+        <ValueNode>__value_</ValueNode>
+      </LinkedListItems>
+    </Expand>
+  </Type>
+
+  <!-- Note: Not in __1! But will win over the one in stl.natvis -->
+  <Type Name="std::initializer_list&lt;*&gt;">
+    <DisplayString>{{ size={__size_} }}</DisplayString>
+    <Expand>
+      <ArrayItems>
+        <Size>__size_</Size>
+        <ValuePointer>__begin_</ValuePointer>
+      </ArrayItems>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::list&lt;*&gt;">
+    <Intrinsic Name="size" Expression="*(size_type*)&amp;__size_alloc_" />
+    <DisplayString>{{ size={size()} }}</DisplayString>
+    <Expand>
+      <LinkedListItems>
+        <Size>size()</Size>
+        <HeadPointer>__end_.__next_</HeadPointer>
+        <NextPointer>__next_</NextPointer>
+        <ValueNode>
+          ((std::__1::list&lt;$T1,$T2&gt;::__node_pointer)this)
+              -&gt;__value_
+        </ValueNode>
+      </LinkedListItems>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::map&lt;*&gt;">
+    <Intrinsic Name="size" Expression="*(size_type*)&amp;__tree_.__pair3_" />
+    <DisplayString>{{ size={size()} }}</DisplayString>
+    <Expand>
+      <Item Name="[size]">size()</Item>
+      <TreeItems>
+        <Size>size()</Size>
+        <HeadPointer>
+          ((__node_pointer)&amp;__tree_.__pair1_)-&gt;__left_
+        </HeadPointer>
+        <LeftPointer>
+          ((std::__1::map&lt;$T1,$T2,$T3,$T4&gt;::__node_pointer)this)
+              -&gt;__left_
+        </LeftPointer>
+        <RightPointer>
+          ((std::__1::map&lt;$T1,$T2,$T3,$T4&gt;::__node_pointer)this)
+              -&gt;__right_
+        </RightPointer>
+        <ValueNode>
+          ((std::__1::map&lt;$T1,$T2,$T3,$T4&gt;::__node_pointer)this)
+              -&gt;__value_.__cc
+        </ValueNode>
+      </TreeItems>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::multimap&lt;*&gt;">
+    <Intrinsic Name="size" Expression="*(size_type*)&amp;__tree_.__pair3_" />
+    <DisplayString>{{ size={size()} }}</DisplayString>
+    <Expand>
+      <Item Name="[size]">size()</Item>
+      <TreeItems>
+        <Size>size()</Size>
+        <HeadPointer>
+          ((__node_pointer)&amp;__tree_.__pair1_)-&gt;__left_
+        </HeadPointer>
+        <LeftPointer>
+          ((std::__1::multimap&lt;$T1,$T2,$T3,$T4&gt;::__node_pointer)this)
+              -&gt;__left_
+        </LeftPointer>
+        <RightPointer>
+          ((std::__1::multimap&lt;$T1,$T2,$T3,$T4&gt;::__node_pointer)this)
+              -&gt;__right_
+        </RightPointer>
+        <ValueNode>
+          ((std::__1::multimap&lt;$T1,$T2,$T3,$T4&gt;::__node_pointer)this)
+              -&gt;__value_.__cc
+        </ValueNode>
+      </TreeItems>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::multiset&lt;*&gt;">
+    <Intrinsic Name="size" Expression="*(size_type*)&amp;__tree_.__pair3_" />
+    <DisplayString>{{ size={size()} }}</DisplayString>
+    <Expand>
+      <Item Name="[size]">size()</Item>
+      <TreeItems>
+        <Size>size()</Size>
+        <HeadPointer>
+          ((__base::__node_pointer)&amp;__tree_.__pair1_)-&gt;__left_
+        </HeadPointer>
+        <LeftPointer>
+          ((std::__1::multiset&lt;$T1,$T2,$T3&gt;::__base::__node_pointer)this)
+              -&gt;__left_
+        </LeftPointer>
+        <RightPointer>
+          ((std::__1::multiset&lt;$T1,$T2,$T3&gt;::__base::__node_pointer)this)
+              -&gt;__right_
+        </RightPointer>
+        <ValueNode>
+          ((std::__1::multiset&lt;$T1,$T2,$T3&gt;::__base::__node_pointer)this)
+              -&gt;__value_
+        </ValueNode>
+      </TreeItems>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::priority_queue&lt;*&gt;">
+    <DisplayString>{c}</DisplayString>
+    <Expand>
+      <ExpandedItem>c</ExpandedItem>
+      <Item Name="[comp]">comp</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::set&lt;*&gt;">
+    <Intrinsic Name="size" Expression="*(size_type*)&amp;__tree_.__pair3_" />
+    <DisplayString>{{ size={size()} }}</DisplayString>
+    <Expand>
+      <Item Name="[size]">size()</Item>
+      <TreeItems>
+        <Size>size()</Size>
+        <HeadPointer>
+          ((__base::__node_pointer)&amp;__tree_.__pair1_)-&gt;__left_
+        </HeadPointer>
+        <LeftPointer>
+          ((std::__1::set&lt;$T1,$T2,$T3&gt;::__base::__node_pointer)this)
+              -&gt;__left_
+        </LeftPointer>
+        <RightPointer>
+          ((std::__1::set&lt;$T1,$T2,$T3&gt;::__base::__node_pointer)this)
+              -&gt;__right_
+        </RightPointer>
+        <ValueNode>
+          ((std::__1::set&lt;$T1,$T2,$T3&gt;::__base::__node_pointer)this)
+              -&gt;__value_
+        </ValueNode>
+      </TreeItems>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::stack&lt;*&gt;">
+    <AlternativeType Name="std::__1::queue&lt;*&gt;" />
+    <DisplayString>{c}</DisplayString>
+    <Expand>
+      <ExpandedItem>c</ExpandedItem>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::__tuple_leaf&lt;*,*,0&gt;">
+    <DisplayString>{__value_}</DisplayString>
+  </Type>
+
+  <Type Name="std::__1::tuple&lt;&gt;">
+    <DisplayString>()</DisplayString>
+  </Type>
+
+  <Type Name="std::__1::tuple&lt;*&gt;">
+    <DisplayString>({(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_})</DisplayString>
+      <Expand>
+          <Item Name="[0]">(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_</Item>
+      </Expand>
+  </Type>
+
+  <Type Name="std::__1::tuple&lt;*,*&gt;">
+    <DisplayString>({(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;1,$T2,0&gt;)__base_})</DisplayString>
+    <Expand>
+      <Item Name="[0]">(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_</Item>
+      <Item Name="[1]">(std::__1::__tuple_leaf&lt;1,$T2,0&gt;)__base_</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::tuple&lt;*,*,*&gt;">
+    <DisplayString>({(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;1,$T2,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;2,$T3,0&gt;)__base_})</DisplayString>
+    <Expand>
+      <Item Name="[0]">(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_</Item>
+      <Item Name="[1]">(std::__1::__tuple_leaf&lt;1,$T2,0&gt;)__base_</Item>
+      <Item Name="[2]">(std::__1::__tuple_leaf&lt;2,$T3,0&gt;)__base_</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::tuple&lt;*,*,*,*&gt;">
+    <DisplayString>({(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;1,$T2,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;2,$T3,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;3,$T4,0&gt;)__base_})</DisplayString>
+    <Expand>
+      <Item Name="[0]">(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_</Item>
+      <Item Name="[1]">(std::__1::__tuple_leaf&lt;1,$T2,0&gt;)__base_</Item>
+      <Item Name="[2]">(std::__1::__tuple_leaf&lt;2,$T3,0&gt;)__base_</Item>
+      <Item Name="[3]">(std::__1::__tuple_leaf&lt;3,$T4,0&gt;)__base_</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::tuple&lt;*,*,*,*,*&gt;">
+    <DisplayString>({(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;1,$T2,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;2,$T3,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;3,$T4,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;4,$T5,0&gt;)__base_})</DisplayString>
+    <Expand>
+      <Item Name="[0]">(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_</Item>
+      <Item Name="[1]">(std::__1::__tuple_leaf&lt;1,$T2,0&gt;)__base_</Item>
+      <Item Name="[2]">(std::__1::__tuple_leaf&lt;2,$T3,0&gt;)__base_</Item>
+      <Item Name="[3]">(std::__1::__tuple_leaf&lt;3,$T4,0&gt;)__base_</Item>
+      <Item Name="[4]">(std::__1::__tuple_leaf&lt;4,$T5,0&gt;)__base_</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::tuple&lt;*,*,*,*,*,*&gt;">
+    <DisplayString>({(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;1,$T2,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;2,$T3,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;3,$T4,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;4,$T5,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;5,$T6,0&gt;)__base_})</DisplayString>
+    <Expand>
+      <Item Name="[0]">(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_</Item>
+      <Item Name="[1]">(std::__1::__tuple_leaf&lt;1,$T2,0&gt;)__base_</Item>
+      <Item Name="[2]">(std::__1::__tuple_leaf&lt;2,$T3,0&gt;)__base_</Item>
+      <Item Name="[3]">(std::__1::__tuple_leaf&lt;3,$T4,0&gt;)__base_</Item>
+      <Item Name="[4]">(std::__1::__tuple_leaf&lt;4,$T5,0&gt;)__base_</Item>
+      <Item Name="[5]">(std::__1::__tuple_leaf&lt;5,$T6,0&gt;)__base_</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::tuple&lt;*,*,*,*,*,*,*&gt;">
+    <DisplayString>({(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;1,$T2,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;2,$T3,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;3,$T4,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;4,$T5,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;5,$T6,0&gt;)__base_}, {(std::__1::__tuple_leaf&lt;6,$T7,0&gt;)__base_})</DisplayString>
+    <Expand>
+      <Item Name="[0]">(std::__1::__tuple_leaf&lt;0,$T1,0&gt;)__base_</Item>
+      <Item Name="[1]">(std::__1::__tuple_leaf&lt;1,$T2,0&gt;)__base_</Item>
+      <Item Name="[2]">(std::__1::__tuple_leaf&lt;2,$T3,0&gt;)__base_</Item>
+      <Item Name="[3]">(std::__1::__tuple_leaf&lt;3,$T4,0&gt;)__base_</Item>
+      <Item Name="[4]">(std::__1::__tuple_leaf&lt;4,$T5,0&gt;)__base_</Item>
+      <Item Name="[5]">(std::__1::__tuple_leaf&lt;5,$T6,0&gt;)__base_</Item>
+      <Item Name="[6]">(std::__1::__tuple_leaf&lt;6,$T7,0&gt;)__base_</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::unique_ptr&lt;*&gt;">
+    <Intrinsic Name="value" Expression="*($T1**)&amp;__ptr_" />
+    <SmartPointer Usage="Minimal">value()</SmartPointer>
+      <DisplayString Condition="value() == 0">empty</DisplayString>
+      <DisplayString Condition="value() != 0">
+        unique_ptr {value()}</DisplayString>
+      <Expand>
+        <Item Condition="value() != 0" Name="[ptr]">value()</Item>
+      </Expand>
+  </Type>
+
+<Type Name="std::__1::unordered_map&lt;*&gt;">
+    <AlternativeType Name="std::__1::unordered_multimap&lt;*&gt;" />
+    <AlternativeType Name="std::__1::unordered_multiset&lt;*&gt;" />
+    <AlternativeType Name="std::__1::unordered_set&lt;*&gt;" />
+    <Intrinsic Name="size" Expression="*(size_type*)&amp;__table_.__p2_" />
+    <Intrinsic Name="bucket_count"
+        Expression="*(size_type*)&amp;
+                    ((__table::__bucket_list_deleter*)
+                        ((void**)&amp;__table_.__bucket_list_ + 1))
+                        -&gt;__data_" />
+    <DisplayString>{{ size={size()} }}</DisplayString>
+    <Expand>
+      <Item Name="[bucket_count]">bucket_count()</Item>
+      <Item Name="[load_factor]">
+        bucket_count() != 0 ? (float)size() / bucket_count() : 0.f</Item>
+      <Item Name="[max_load_factor]">*(float*)&amp;__table_.__p3_</Item>
+      <!-- Use CustomListItems instead of LinkedListItems because we
+        need to cast to __table::__node_pointer and LinkedListItems
+        evaluates <Value> in the context of the node, not of the container,
+        so we'd have to say std::unordered_map<$T1,...>::__table::__node_pointer
+        and then we couldn't share this <Type> between unordered_(multi)map
+        and unordered_(multi)set. -->
+      <CustomListItems>
+        <Variable Name="node"
+            InitialValue="*(__table::__next_pointer*)&amp;__table_.__p1_" />
+        <Size>size()</Size>
+        <Loop>
+          <Item>(*(__table::__node_pointer*)&amp;node)-&gt;__value_</Item>
+          <Exec>node = node-&gt;__next_</Exec>
+        </Loop>
+      </CustomListItems>
+    </Expand>
+  </Type>
+  <!-- This is the node __value_ of an unordered_(multi)map. Expand it through
+    a separate formatter instead of in the <Item> expression above so that the
+    same <Type> works for unordered_(multi)set and unordered_(multi)map. -->
+  <Type Name="std::__1::__hash_value_type&lt;*&gt;">
+    <DisplayString>{__cc}</DisplayString>
+    <Expand>
+      <ExpandedItem>__cc</ExpandedItem>
+    </Expand>
+  </Type>
+
+  <Type Name="std::__1::vector&lt;*&gt;">
+    <Intrinsic Name="size" Expression="__end_ - __begin_" />
+    <DisplayString>{{ size={size()} }}</DisplayString>
+    <Expand>
+      <ArrayItems>
+        <Size>size()</Size>
+        <ValuePointer>__begin_</ValuePointer>
+      </ArrayItems>
+    </Expand>
+  </Type>
+</AutoVisualizer>
diff --git a/third_party/libwebrtc/build/config/chrome_build.gni b/third_party/libwebrtc/build/config/chrome_build.gni
new file mode 100644
index 0000000000..5c51d7f2cc
--- /dev/null
+++ b/third_party/libwebrtc/build/config/chrome_build.gni
@@ -0,0 +1,25 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  # Select the desired branding flavor. False means normal Chromium branding,
+  # true means official Google Chrome branding (requires extra Google-internal
+  # resources).
+  is_chrome_branded = false
+}
+
+declare_args() {
+  # Refers to the subdirectory for branding in various places including
+  # chrome/app/theme.
+  if (is_chrome_branded) {
+    branding_path_component = "google_chrome"
+  } else {
+    branding_path_component = "chromium"
+  }
+}
+
+declare_args() {
+  # The path to the BRANDING file in chrome/app/theme.
+  branding_file_path = "//chrome/app/theme/$branding_path_component/BRANDING"
+}
diff --git a/third_party/libwebrtc/build/config/chromecast/BUILD.gn b/third_party/libwebrtc/build/config/chromecast/BUILD.gn
new file mode 100644
index 0000000000..d52d19cad8
--- /dev/null
+++ b/third_party/libwebrtc/build/config/chromecast/BUILD.gn
@@ -0,0 +1,95 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chromecast_build.gni")
+
+assert(is_chromecast)
+
+config("static_config") {
+  if (!is_clang) {
+    ldflags = [
+      # Don't allow visible symbols from libraries that contain
+      # assembly code with symbols that aren't hidden properly.
+      # http://b/26390825
+      "-Wl,--exclude-libs=libffmpeg.a",
+    ]
+
+    if (!is_android) {
+      ldflags += [
+        # We want to statically link libstdc++/libgcc on Linux.
+        # (On Android, libstdc++ and libgcc aren't used.)
+        "-static-libstdc++",
+        "-static-libgcc",
+      ]
+    }
+  }
+}
+
+config("ldconfig") {
+  visibility = [ ":*" ]
+  configs = []
+
+  # Chromecast executables depend on several shared libraries in
+  # /oem_cast_shlib, $ORIGIN, and $ORIGIN/lib. Add these rpaths to each binary.
+  # This is explicitly disabled in Chrome for security reasons (see comments in
+  # //build/config/gcc/BUILD.gn), but necessary on Chromecast so that OEM's may
+  # override the default libraries shipped in the Cast receiver package.
+  if (target_rpath == "") {
+    ldflags = [
+      "-Wl,-rpath=/oem_cast_shlib",
+      "-Wl,-rpath=\$ORIGIN/lib",
+      "-Wl,-rpath=\$ORIGIN",
+    ]
+  } else {
+    ldflags = [ "-Wl,-rpath=${target_rpath}" ]
+  }
+
+  if (chromecast_branding != "public") {
+    # Some internal x64 builds need additional rpath and dynamic-linker config.
+    configs += [ "//chromecast/internal/build/config/ldconfig" ]
+  }
+
+  # Binaries which don't live in the same directory as Chrome component
+  # libraries may still depend on them. Explicitly add the component library
+  # directory to the rpath for the component build.
+  if (is_component_build) {
+    ldflags += [ "-Wl,-rpath=/system/chrome" ]
+  }
+}
+
+config("executable_config") {
+  configs = [ ":ldconfig" ]
+
+  if (!is_clang && target_cpu == "arm") {
+    ldflags = [
+      # Export stdlibc++ and libgcc symbols to force shlibs to refer to these
+      # symbols from the executable.
+      "-Wl,--export-dynamic",
+
+      "-lm",  # stdlibc++ requires math.h
+
+      # In case we redefined stdlibc++ symbols (e.g. tc_malloc)
+      "-Wl,--allow-multiple-definition",
+
+      "-Wl,--whole-archive",
+      "-l:libstdc++.a",
+      "-l:libgcc.a",
+      "-Wl,--no-whole-archive",
+    ]
+
+    # Despite including libstdc++/libgcc archives, we still need to specify
+    # static linking for them in order to prevent the executable from having a
+    # dynamic dependency on them.
+    configs += [ ":static_config" ]
+  }
+}
+
+# Shared libaries should not have RPATH or RUNPATH set. This allows the
+# shared libs to inherit RPATH from the parent executable that is loading
+# the shared library. (See internal b/37514052 for more details.)
+config("shared_library_config") {
+  if (target_cpu == "arm") {
+    configs = [ ":static_config" ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/chromecast_build.gni b/third_party/libwebrtc/build/config/chromecast_build.gni
new file mode 100644
index 0000000000..b309e29d96
--- /dev/null
+++ b/third_party/libwebrtc/build/config/chromecast_build.gni
@@ -0,0 +1,121 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# The args declared in this file should be referenced by components outside of
+# //chromecast. Args needed only in //chromecast should be declared in
+# //chromecast/chromecast.gni.
+declare_args() {
+  # Set this true for a Chromecast build. Chromecast builds are supported on
+  # Linux and Android.
+  is_chromecast = false
+
+  # If true, IS_CAST_DEBUG_BUILD() will evaluate to 1 in version.h. Otherwise,
+  # it will evaluate to 0. Overriding this when is_debug=false is useful for
+  # doing engineering builds.
+  cast_is_debug = is_debug
+
+  # chromecast_branding is used to include or exclude Google-branded components.
+  # Set it to "public" for a Chromium build.
+  chromecast_branding = "public"
+
+  # Set this true for an audio-only Chromecast build.
+  is_cast_audio_only = false
+
+  # If non empty, rpath of executables is set to this.
+  # If empty, default value is used.
+  target_rpath = ""
+
+  # Set true to enable modular_updater.
+  enable_modular_updater = false
+}
+
+# Note(slan): This arg depends on the value of is_chromecast, and thus must be
+# declared in a separate block. These blocks can be combined when/if
+# crbug.com/542846 is resolved.
+declare_args() {
+  # True if Chromecast build is targeted for linux desktop. This type of build
+  # is useful for testing and development, but currently supports only a subset
+  # of Cast functionality. Though this defaults to true for x86 Linux devices,
+  # this should be overriden manually for an embedded x86 build.
+  # TODO(slan): Remove instances of this when x86 is a fully supported platform.
+  is_cast_desktop_build = is_chromecast && target_os == "linux" &&
+                          (target_cpu == "x86" || target_cpu == "x64")
+
+  # Mozilla added: Until upstream's build repo is updated to
+  # 56e01bffd1de3e5b27e0da87f8019d44aa55a562, we'll default this to false
+  # to keep the build happy.
+  is_castos = false
+}
+
+declare_args() {
+  # True to enable the cast renderer.  It is enabled by default for linux and
+  # android audio only builds.
+  enable_cast_renderer = is_chromecast && (is_linux || is_chromeos ||
+                                           (is_cast_audio_only && is_android))
+}
+
+declare_args() {
+  # True to enable the cast audio renderer.
+  enable_cast_audio_renderer = false
+}
+
+# Configures media options for cast.  See media/media_options.gni
+cast_mojo_media_services = []
+cast_mojo_media_host = ""
+
+if (enable_cast_audio_renderer) {
+  if (is_android) {
+    cast_mojo_media_services = [
+      "cdm",
+      "audio_decoder",
+    ]
+  }
+
+  if (!is_cast_audio_only) {
+    cast_mojo_media_services += [ "video_decoder" ]
+  }
+
+  if (is_android && is_cast_audio_only) {
+    cast_mojo_media_host = "browser"
+  } else {
+    cast_mojo_media_host = "gpu"
+  }
+} else if (enable_cast_renderer) {
+  # In this path, mojo media services are hosted in two processes:
+  # 1. "renderer" and "cdm" run in browser process. This is hard coded in the
+  # code.
+  # 2. "video_decoder" runs in the process specified by "cast_mojo_media_host".
+  cast_mojo_media_services = [
+    "cdm",
+    "renderer",
+  ]
+  if (!is_cast_audio_only) {
+    cast_mojo_media_services += [ "video_decoder" ]
+  }
+
+  cast_mojo_media_host = "gpu"
+} else if (is_android) {
+  # On Android, all the enabled mojo media services run in the process specified
+  # by "cast_mojo_media_host".
+  cast_mojo_media_services = [
+    "cdm",
+    "audio_decoder",
+  ]
+  if (!is_cast_audio_only) {
+    # These are Cast/Android devices with Video capabilities (and GPU)
+    cast_mojo_media_services += [ "video_decoder" ]
+    cast_mojo_media_host = "gpu"
+  } else {
+    # These are Cast/Android devices with only Audio capabilities (no GPU)
+    cast_mojo_media_host = "browser"
+  }
+}
+
+# Assert that Chromecast is being built for a supported platform.
+assert(is_linux || is_chromeos || is_android || is_fuchsia || !is_chromecast,
+       "Chromecast builds are not supported on $target_os")
+
+# Assert that is_cast_audio_only and is_cast_desktop_build are both false on a
+# non-Chromecast build.
+assert(is_chromecast || (!is_cast_audio_only && !is_cast_desktop_build))
diff --git a/third_party/libwebrtc/build/config/chromeos/BUILD.gn b/third_party/libwebrtc/build/config/chromeos/BUILD.gn
new file mode 100644
index 0000000000..f3dfe70d42
--- /dev/null
+++ b/third_party/libwebrtc/build/config/chromeos/BUILD.gn
@@ -0,0 +1,34 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chromeos/ui_mode.gni")
+
+assert(is_chromeos_ash)
+
+declare_args() {
+  # The location to a file used to dump symbols ordered by Call-Chain Clustering (C3)
+  # https://research.fb.com/wp-content/uploads/2017/01/cgo2017-hfsort-final1.pdf?
+  # to a file, used for generating orderfiles in Chrome OS
+  dump_call_chain_clustering_order = ""
+}
+
+declare_args() {
+  # Whether or not we're using new pass manager to build and link Chrome
+  use_new_pass_manager = dump_call_chain_clustering_order != ""
+}
+
+config("print_orderfile") {
+  if (dump_call_chain_clustering_order != "") {
+    _output_orderfile =
+        rebase_path(dump_call_chain_clustering_order, root_build_dir)
+    ldflags = [ "-Wl,--print-symbol-order=$_output_orderfile" ]
+  }
+}
+
+config("compiler") {
+  if (use_new_pass_manager) {
+    cflags = [ "-fexperimental-new-pass-manager" ]
+    ldflags = [ "-fexperimental-new-pass-manager" ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/chromeos/args.gni b/third_party/libwebrtc/build/config/chromeos/args.gni
new file mode 100644
index 0000000000..99c7d601a3
--- /dev/null
+++ b/third_party/libwebrtc/build/config/chromeos/args.gni
@@ -0,0 +1,30 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  # This is used only by Simple Chrome to bind its value to test-runner scripts
+  # generated at build-time.
+  cros_board = ""
+
+  # Similar to cros_board above, this used only by test-runner scripts in
+  # Simple Chrome.
+  cros_sdk_version = ""
+}
+
+# Ensure that if one is set, the other is as well.
+assert(cros_board == "" == (cros_sdk_version == ""))
+
+declare_args() {
+  # Determines if we're building for a Chrome OS device (or VM) and not just
+  # linux-chromeos. NOTE: Most test targets in Chrome expect to run under
+  # linux-chromeos, so some have compile-time asserts that intentionally fail
+  # when this build flag is set. Build and run the tests for linux-chromeos
+  # instead.
+  # https://chromium.googlesource.com/chromium/src/+/main/docs/chromeos_build_instructions.md
+  # https://chromium.googlesource.com/chromiumos/docs/+/main/simple_chrome_workflow.md
+  is_chromeos_device = false
+
+  # Determines if we run the test in skylab, aka the CrOS labs.
+  is_skylab = false
+}
diff --git a/third_party/libwebrtc/build/config/chromeos/rules.gni b/third_party/libwebrtc/build/config/chromeos/rules.gni
new file mode 100644
index 0000000000..09f9701a7a
--- /dev/null
+++ b/third_party/libwebrtc/build/config/chromeos/rules.gni
@@ -0,0 +1,510 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chrome_build.gni")
+import("//build/config/chromeos/args.gni")
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/config/gclient_args.gni")
+import("//build/config/python.gni")
+import("//build/util/generate_wrapper.gni")
+
+assert((is_chromeos_ash || is_chromeos_lacros) && is_chromeos_device)
+
+# Determine the real paths for various items in the SDK, which may be used
+# in the 'generate_runner_script' template below. We do so outside the template
+# to confine exec_script to a single invocation.
+if (cros_sdk_version != "") {
+  # Ideally these should be maps, however, gn doesn't support map, so using a
+  # list of list to simulate a map:
+  # [key1, [value1, value2, ...]], [key2, [value1, value2, ...]], where
+  # the keys are boards and values are symlinks or symlink targets, and the
+  # mapping shouldn't be used for anything else.
+  #
+  # A sample usage is:
+  # foreach(m, _symlink_targets_map) {
+  #   if(m[0] == target_key) {
+  #     target_value = m[1]
+  #   }
+  # }
+  #
+  _symlink_map = []
+  _symlink_targets_map = []
+
+  if (is_chromeos_ash) {
+    _potential_test_boards = [ cros_board ]
+  } else {
+    _potential_test_boards = []
+    if (cros_boards != "") {
+      _potential_test_boards += string_split(cros_boards, ":")
+    }
+    if (cros_boards_with_qemu_images != "") {
+      _potential_test_boards += string_split(cros_boards_with_qemu_images, ":")
+    }
+  }
+
+  foreach(b, _potential_test_boards) {
+    _cache_path_prefix =
+        "//build/cros_cache/chrome-sdk/symlinks/${b}+${cros_sdk_version}"
+
+    _cros_is_vm = false
+    foreach(b1, string_split(cros_boards_with_qemu_images, ":")) {
+      if (b == b1) {
+        _cros_is_vm = true
+      }
+    }
+
+    _symlinks = []
+    _symlinks = [
+      # Tast harness & test data.
+      rebase_path("${_cache_path_prefix}+chromeos-base/tast-cmd"),
+      rebase_path("${_cache_path_prefix}+chromeos-base/tast-remote-tests-cros"),
+
+      # Binutils (and other toolchain tools) used to deploy Chrome to the device.
+      rebase_path(
+          "${_cache_path_prefix}+environment_chromeos-base_chromeos-chrome.tar.xz"),
+      rebase_path("${_cache_path_prefix}+target_toolchain"),
+    ]
+    if (_cros_is_vm) {
+      # VM-related tools.
+      _symlinks += [
+        rebase_path("${_cache_path_prefix}+sys-firmware/seabios"),
+        rebase_path("${_cache_path_prefix}+chromiumos_test_image.tar.xz"),
+        rebase_path("${_cache_path_prefix}+app-emulation/qemu"),
+      ]
+    }
+    _symlink_map += [ [
+          b,
+          _symlinks,
+        ] ]
+  }
+
+  _all_symlinks = []
+  foreach(m, _symlink_map) {
+    _all_symlinks += m[1]
+  }
+  _all_symlink_targets =
+      exec_script("//build/get_symlink_targets.py", _all_symlinks, "list lines")
+  _index = 0
+  foreach(m, _symlink_map) {
+    _symlink_targets = []
+    foreach(_, m[1]) {
+      _symlink_targets += [ _all_symlink_targets[_index] ]
+      _index += 1
+    }
+
+    _symlink_targets_map += [ [
+          m[0],
+          _symlink_targets,
+        ] ]
+  }
+}
+
+# Creates a script at $generated_script that can be used to launch a cros VM
+# and optionally run a test within it.
+# Args:
+#   test_exe: Name of test binary located in the out dir. This will get copied
+#       to the VM and executed there.
+#   tast_attr_expr: Tast expression to pass to local_test_runner on the VM.
+#   tast_tests: List of Tast tests to run on the VM. Note that when this is
+#       specified, the target name used to invoke this template will be
+#       designated as the "name" of this test and will primarly used for test
+#       results tracking and displaying (eg: flakiness dashboard).
+#   generated_script: Path to place the generated script.
+#   deploy_chrome: If true, deploys a locally built chrome located in the root
+#       build dir to the VM or DUT after launching it.
+#   deploy_lacros: If true, deploys a locally built Lacros located in the root
+#       build dir to the VM or DUT after launching it.
+#   runtime_deps_file: Path to file listing runtime deps for the test. If set,
+#       all files listed will be copied to the VM before testing.
+#   skip_generating_board_args: By default, this template generates an '--board'
+#       arg with corresponding '--flash' or '--use-vm' args for device and vm
+#       respectively. This argument instructs the template to skip generating
+#       them, and it's designed for use cases where one builds for one board
+#       (e.g. amd64-generic), but tests on a different board (e.g. eve).
+#   tast_vars: A list of "key=value" runtime variable pairs to pass to invoke
+#       the Tast tests. For more details, please see:
+#       https://chromium.googlesource.com/chromiumos/platform/tast/+/HEAD/docs/writing_tests.md#Runtime-variables
+template("generate_runner_script") {
+  forward_variables_from(invoker,
+                         [
+                           "deploy_chrome",
+                           "deploy_lacros",
+                           "generated_script",
+                           "runtime_deps_file",
+                           "skip_generating_board_args",
+                           "tast_attr_expr",
+                           "tast_tests",
+                           "tast_vars",
+                           "testonly",
+                           "test_exe",
+                         ])
+
+  if (!defined(skip_generating_board_args)) {
+    skip_generating_board_args = false
+  }
+
+  if (skip_generating_board_args) {
+    # cros_board is not needed, so setting it to empty to avoid being used
+    # accidentally below.
+    cros_board = ""
+    not_needed([ cros_board ])
+  }
+
+  if (!defined(deploy_chrome)) {
+    deploy_chrome = false
+  }
+  if (!defined(deploy_lacros)) {
+    deploy_lacros = false
+  }
+  assert(!(deploy_chrome && deploy_lacros),
+         "deploy_chrome and deploy_lacros are exclusive.")
+
+  is_tast = defined(tast_attr_expr) || defined(tast_tests)
+  assert(!(is_tast && defined(test_exe)),
+         "Tast tests are invoked from binaries shipped with the VM image. " +
+             "There should be no locally built binary needed.")
+  assert(is_tast || !defined(tast_vars),
+         "tast_vars is only support for Tast tests")
+
+  # If we're in the cros chrome-sdk (and not the raw ebuild), the test will
+  # need some additional runtime data located in the SDK cache.
+  _sdk_data = []
+  if (cros_sdk_version != "") {
+    assert(defined(generated_script),
+           "Must specify where to place generated test launcher script via " +
+               "'generated_script'")
+
+    foreach(b, _potential_test_boards) {
+      _cros_is_vm = false
+      foreach(b1, string_split(cros_boards_with_qemu_images, ":")) {
+        if (b == b1) {
+          _cros_is_vm = true
+        }
+      }
+
+      # Determine the real paths for various items in the SDK, which may be used
+      # in the 'generate_runner_script' template below.
+      if (is_tast || _cros_is_vm || deploy_chrome) {
+        _symlink_targets = []
+        foreach(m, _symlink_targets_map) {
+          if (b == m[0]) {
+            _symlink_targets = []
+            _symlink_targets = m[1]
+          }
+        }
+
+        if (is_tast) {
+          # Add tast sdk items.
+          _sdk_data += [
+            _symlink_targets[0],
+            _symlink_targets[1],
+          ]
+        }
+        if (deploy_chrome) {
+          # To deploy chrome to the VM, it needs to be stripped down to fit into
+          # the VM. This is done by using binutils in the toolchain. So add the
+          # toolchain to the data.
+          _sdk_data += [
+            _symlink_targets[2],
+            _symlink_targets[3],
+          ]
+        }
+        if (_cros_is_vm) {
+          # Add vm sdk items.
+          _sdk_data += [
+            _symlink_targets[4],
+            _symlink_targets[5],
+            _symlink_targets[6],
+          ]
+        }
+      }
+    }
+  }
+
+  generate_wrapper(target_name) {
+    executable = "//build/chromeos/test_runner.py"
+    use_vpython3 = true
+    wrapper_script = generated_script
+    executable_args = []
+
+    if (defined(runtime_deps_file)) {
+      write_runtime_deps = runtime_deps_file
+    }
+
+    # Build executable_args for the three different test types: GTest, Tast,
+    # and host-side commands (eg telemetry).
+    if (defined(test_exe)) {
+      executable_args += [
+        "gtest",
+        "--test-exe",
+        test_exe,
+      ]
+      if (defined(runtime_deps_file)) {
+        executable_args += [
+          "--runtime-deps-path",
+          rebase_path(runtime_deps_file, root_build_dir),
+        ]
+      }
+    } else if (is_tast) {
+      # When --tast-tests is specified, test_runner.py will call
+      # local_test_runner on the VM to run the set of tests.
+      executable_args += [
+        "tast",
+        "--suite-name",
+        target_name,
+      ]
+      if (defined(tast_attr_expr)) {
+        executable_args += [
+          "--attr-expr",
+          tast_attr_expr,
+        ]
+      } else {
+        foreach(test, tast_tests) {
+          executable_args += [
+            "-t",
+            test,
+          ]
+        }
+      }
+      if (defined(tast_vars)) {
+        foreach(var, tast_vars) {
+          executable_args += [
+            "--tast-var",
+            var,
+          ]
+        }
+      }
+    } else {
+      executable_args += [ "host-cmd" ]
+    }
+    executable_args += [
+      "--cros-cache",
+      "build/cros_cache/",
+      "--path-to-outdir",
+      rebase_path(root_out_dir, "//"),
+      "-v",
+    ]
+
+    if (!skip_generating_board_args) {
+      executable_args += [
+        "--board",
+        cros_board,
+      ]
+
+      _cros_is_vm = false
+      foreach(b, string_split(cros_boards_with_qemu_images, ":")) {
+        if (cros_board == b) {
+          _cros_is_vm = true
+        }
+      }
+      if (_cros_is_vm) {
+        executable_args += [ "--use-vm" ]
+      } else {
+        executable_args += [ "--flash" ]
+      }
+    }
+
+    # If we have public Chromium builds, use public Chromium OS images when
+    # flashing the test device.
+    if (!is_chrome_branded) {
+      executable_args += [ "--public-image" ]
+    }
+
+    if (deploy_lacros) {
+      executable_args += [ "--deploy-lacros" ]
+    }
+
+    if (deploy_chrome && !defined(test_exe) && !is_tast) {
+      executable_args += [ "--deploy-chrome" ]
+    }
+
+    # executable_args should be finished, now build the data and deps lists.
+    deps = [ "//testing/buildbot/filters:chromeos_filters" ]
+    if (defined(invoker.deps)) {
+      deps += invoker.deps
+    }
+    data = [
+      "//.vpython",
+      "//.vpython3",
+
+      # We use android test-runner's results libs to construct gtest output
+      # json.
+      "//build/android/pylib/__init__.py",
+      "//build/android/pylib/base/",
+      "//build/android/pylib/results/",
+      "//build/chromeos/",
+      "//build/util/",
+
+      # Needed for various SDK components used below.
+      "//build/cros_cache/chrome-sdk/misc/",
+      "//build/cros_cache/chrome-sdk/symlinks/",
+
+      # The LKGM file controls what version of the VM image to download. Add it
+      # as data here so that changes to it will trigger analyze.
+      "//chromeos/CHROMEOS_LKGM",
+      "//third_party/chromite/",
+    ]
+
+    data += _sdk_data
+
+    if (defined(invoker.data)) {
+      data += invoker.data
+    }
+
+    data_deps = [ "//testing:test_scripts_shared" ]
+    if (defined(invoker.data_deps)) {
+      data_deps += invoker.data_deps
+    }
+  }
+}
+
+template("tast_test") {
+  forward_variables_from(invoker, "*")
+
+  # Default the expression to match any chrome-related test.
+  if (!defined(tast_attr_expr) && !defined(tast_tests)) {
+    # The following expression filters out all non-critical tests. See the link
+    # below for more details:
+    # https://chromium.googlesource.com/chromiumos/platform/tast/+/main/docs/test_attributes.md
+    tast_attr_expr = "\"group:mainline\" && \"dep:chrome\""
+
+    if (defined(enable_tast_informational_tests) &&
+        enable_tast_informational_tests) {
+      tast_attr_expr += " && informational"
+    } else {
+      tast_attr_expr += " && !informational"
+    }
+    if (!is_chrome_branded) {
+      tast_attr_expr += " && !\"dep:chrome_internal\""
+    }
+  } else {
+    assert(defined(tast_attr_expr) != defined(tast_tests),
+           "Specify one of tast_tests or tast_attr_expr.")
+  }
+
+  # Append any disabled tests to the expression.
+  if (defined(tast_disabled_tests)) {
+    assert(defined(tast_attr_expr),
+           "tast_attr_expr must be used when specifying tast_disabled_tests.")
+    foreach(test, tast_disabled_tests) {
+      tast_attr_expr += " && !\"name:${test}\""
+    }
+  }
+  if (defined(tast_attr_expr)) {
+    tast_attr_expr = "( " + tast_attr_expr + " )"
+  }
+  generate_runner_script(target_name) {
+    testonly = true
+    generated_script = "$root_build_dir/bin/run_${target_name}"
+    runtime_deps_file = "$root_out_dir/${target_name}.runtime_deps"
+    deploy_chrome = true
+    data_deps = [
+      "//:chromiumos_preflight",  # Builds the browser.
+      "//chromeos:cros_chrome_deploy",  # Adds additional browser run-time deps.
+
+      # Tools used to symbolize Chrome crash dumps.
+      # TODO(crbug.com/1156772): Remove these if/when all tests pick them up by
+      # default.
+      "//third_party/breakpad:dump_syms",
+      "//third_party/breakpad:minidump_dump",
+      "//third_party/breakpad:minidump_stackwalk",
+    ]
+
+    data = [ "//components/crash/content/tools/generate_breakpad_symbols.py" ]
+  }
+}
+
+template("lacros_tast_tests") {
+  forward_variables_from(invoker,
+                         [
+                           "tast_attr_expr",
+                           "tast_disabled_tests",
+                           "tast_tests",
+                         ])
+  assert(defined(tast_attr_expr) != defined(tast_tests),
+         "Specify one of tast_tests or tast_attr_expr.")
+
+  # Append any disabled tests to the expression.
+  if (defined(tast_disabled_tests)) {
+    assert(defined(tast_attr_expr),
+           "tast_attr_expr must be used when specifying tast_disabled_tests.")
+    foreach(test, tast_disabled_tests) {
+      tast_attr_expr += " && !\"name:${test}\""
+    }
+  }
+  if (defined(tast_attr_expr)) {
+    tast_attr_expr = "( " + tast_attr_expr + " )"
+  }
+
+  generate_runner_script(target_name) {
+    testonly = true
+    deploy_lacros = true
+    generated_script = "$root_build_dir/bin/run_${target_name}"
+    runtime_deps_file = "$root_out_dir/${target_name}.runtime_deps"
+
+    # At build time, Lacros tests don't know whether they'll run on VM or HW,
+    # and instead, these flags are specified at runtime when invoking the
+    # generated runner script.
+    skip_generating_board_args = true
+
+    # By default, tast tests download a lacros-chrome from a gcs location and
+    # use it for testing. To support running lacros tast tests from Chromium CI,
+    # a Var is added to support pointing the tast tests to use a specified
+    # pre-deployed lacros-chrome. The location is decided by:
+    # https://source.chromium.org/chromium/chromium/src/+/main:third_party/chromite/scripts/deploy_chrome.py;l=80;drc=86f1234a4be8e9574442e076cdc835897f7bea61
+    tast_vars = [ "lacrosDeployedBinary=/usr/local/lacros-chrome" ]
+
+    data_deps = [
+      "//chrome",  # Builds the browser.
+
+      # Tools used to symbolize Chrome crash dumps.
+      # TODO(crbug.com/1156772): Remove these if/when all tests pick them up by
+      # default.
+      "//third_party/breakpad:dump_syms",
+      "//third_party/breakpad:minidump_dump",
+      "//third_party/breakpad:minidump_stackwalk",
+    ]
+
+    data = [
+      "//components/crash/content/tools/generate_breakpad_symbols.py",
+
+      # A script needed to launch Lacros in Lacros Tast tests.
+      "//build/lacros/mojo_connection_lacros_launcher.py",
+    ]
+  }
+}
+
+template("generate_skylab_runner_script") {
+  forward_variables_from(invoker,
+                         [
+                           "generated_script",
+                           "test_exe",
+                         ])
+
+  action(target_name) {
+    script = "//build/chromeos/gen_skylab_runner.py"
+    outputs = [ generated_script ]
+    args = [
+      "--test-exe",
+      test_exe,
+      "--output",
+      rebase_path(generated_script, root_build_dir),
+    ]
+
+    deps = [ "//testing/buildbot/filters:chromeos_filters" ]
+    if (defined(invoker.deps)) {
+      deps += invoker.deps
+    }
+
+    data = [ generated_script ]
+    if (defined(invoker.data)) {
+      data += invoker.data
+    }
+
+    data_deps = [ "//testing:test_scripts_shared" ]
+    if (defined(invoker.data_deps)) {
+      data_deps += invoker.data_deps
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/chromeos/ui_mode.gni b/third_party/libwebrtc/build/config/chromeos/ui_mode.gni
new file mode 100644
index 0000000000..aff59afa66
--- /dev/null
+++ b/third_party/libwebrtc/build/config/chromeos/ui_mode.gni
@@ -0,0 +1,40 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  # Deprecated, use is_lacros.
+  #
+  # This controls UI configuration for Chrome.
+  # If this flag is set, we assume Chrome runs on Chrome OS devices, using
+  # Wayland (instead of X11).
+  #
+  # TODO(crbug.com/1052397):
+  # Define chromeos_product instead, which takes either "browser" or "ash".
+  # Re-define the following variables as:
+  # is_lacros = chromeos_product == "browser"
+  # is_ash = chromeos_product == "ash"
+  chromeos_is_browser_only = false
+
+  # Setting this to true when building LaCrOS-chrome will cause it to
+  # *also* build ash-chrome in a subdirectory using an alternate toolchain.
+  # Don't set this unless you're sure you want it, because it'll double
+  # your build time.
+  also_build_ash_chrome = false
+
+  # Setting this to true when building ash-chrome will cause it to
+  # *also* build lacros-chrome in a subdirectory using an alternate toolchain.
+  also_build_lacros_chrome = false
+}
+
+# is_chromeos_{ash,lacros} is used to specify that it is specific to either
+# ash or lacros chrome for chromeos. For platform specific logic that
+# applies to both, use is_chromeos instead.
+# .gn files are evaluated multiple times for each toolchain.
+# is_chromeos_{ash,lacros} should be set true only for builds with target
+# toolchains.
+is_chromeos_ash = is_chromeos && !chromeos_is_browser_only
+is_chromeos_lacros = is_chromeos && chromeos_is_browser_only
+
+# also_build_ash_chrome and also_build_lacros_chrome cannot be both true.
+assert(!(also_build_ash_chrome && also_build_lacros_chrome))
diff --git a/third_party/libwebrtc/build/config/clang/BUILD.gn b/third_party/libwebrtc/build/config/clang/BUILD.gn
new file mode 100644
index 0000000000..9512c66246
--- /dev/null
+++ b/third_party/libwebrtc/build/config/clang/BUILD.gn
@@ -0,0 +1,59 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("clang.gni")
+
+config("find_bad_constructs") {
+  if (clang_use_chrome_plugins) {
+    cflags = []
+
+    # The plugin is built directly into clang, so there's no need to load it
+    # dynamically.
+    cflags += [
+      "-Xclang",
+      "-add-plugin",
+      "-Xclang",
+      "find-bad-constructs",
+      "-Xclang",
+      "-plugin-arg-find-bad-constructs",
+      "-Xclang",
+      "raw-ptr-template-as-trivial-member",
+    ]
+
+    if (is_linux || is_chromeos || is_android || is_fuchsia) {
+      cflags += [
+        "-Xclang",
+        "-plugin-arg-find-bad-constructs",
+        "-Xclang",
+        "check-ipc",
+      ]
+    }
+  }
+}
+
+# Enables some extra Clang-specific warnings. Some third-party code won't
+# compile with these so may want to remove this config.
+config("extra_warnings") {
+  cflags = [
+    "-Wheader-hygiene",
+
+    # Warns when a const char[] is converted to bool.
+    "-Wstring-conversion",
+
+    "-Wtautological-overlap-compare",
+  ]
+}
+
+group("llvm-symbolizer_data") {
+  if (is_win) {
+    data = [ "$clang_base_path/bin/llvm-symbolizer.exe" ]
+  } else {
+    data = [ "$clang_base_path/bin/llvm-symbolizer" ]
+
+    if (!is_apple) {
+      # llvm-symbolizer uses libstdc++ from the clang package.
+      data += [ "$clang_base_path/lib/libstdc++.so.6" ]
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/clang/clang.gni b/third_party/libwebrtc/build/config/clang/clang.gni
new file mode 100644
index 0000000000..588864586d
--- /dev/null
+++ b/third_party/libwebrtc/build/config/clang/clang.gni
@@ -0,0 +1,18 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/toolchain/toolchain.gni")
+
+default_clang_base_path = "//third_party/llvm-build/Release+Asserts"
+
+declare_args() {
+  # Indicates if the build should use the Chrome-specific plugins for enforcing
+  # coding guidelines, etc. Only used when compiling with Chrome's Clang, not
+  # Chrome OS's.
+  clang_use_chrome_plugins =
+      is_clang && !is_nacl && !use_xcode_clang &&
+      default_toolchain != "//build/toolchain/cros:target"
+
+  clang_base_path = default_clang_base_path
+}
diff --git a/third_party/libwebrtc/build/config/compiler/BUILD.gn b/third_party/libwebrtc/build/config/compiler/BUILD.gn
new file mode 100644
index 0000000000..a1293bc431
--- /dev/null
+++ b/third_party/libwebrtc/build/config/compiler/BUILD.gn
@@ -0,0 +1,2648 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/buildflag_header.gni")
+import("//build/config/android/config.gni")
+import("//build/config/c++/c++.gni")
+import("//build/config/chrome_build.gni")
+import("//build/config/chromecast_build.gni")
+import("//build/config/chromeos/args.gni")
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/config/clang/clang.gni")
+import("//build/config/compiler/compiler.gni")
+import("//build/config/coverage/coverage.gni")
+import("//build/config/dcheck_always_on.gni")
+#import("//build/config/gclient_args.gni")
+import("//build/config/host_byteorder.gni")
+import("//build/config/rust.gni")
+import("//build/config/sanitizers/sanitizers.gni")
+import("//build/config/ui.gni")
+import("//build/toolchain/cc_wrapper.gni")
+import("//build/toolchain/goma.gni")
+import("//build/toolchain/rbe.gni")
+import("//build/toolchain/toolchain.gni")
+import("//build_overrides/build.gni")
+
+if (target_cpu == "arm" || target_cpu == "arm64") {
+  import("//build/config/arm.gni")
+}
+if (target_cpu == "mipsel" || target_cpu == "mips64el" ||
+    target_cpu == "mips" || target_cpu == "mips64") {
+  import("//build/config/mips.gni")
+}
+if (target_cpu == "x64") {
+  import("//build/config/x64.gni")
+}
+if (is_mac) {
+  import("//build/config/apple/symbols.gni")
+}
+if (is_ios) {
+  import("//build/config/ios/ios_sdk.gni")
+}
+if (is_nacl) {
+  # To keep NaCl variables out of builds that don't include NaCl, all
+  # variables defined in nacl/config.gni referenced here should be protected by
+  # is_nacl conditions.
+  import("//build/config/nacl/config.gni")
+}
+
+lld_path = ""
+if (!is_clang) {
+  declare_args() {
+    # This allows overriding the location of lld.
+    lld_path = rebase_path("$clang_base_path/bin", root_build_dir)
+  }
+} else {
+  # clang looks for lld next to it, no need for -B.
+  lld_path = ""
+}
+
+declare_args() {
+  # Normally, Android builds are lightly optimized, even for debug builds, to
+  # keep binary size down. Setting this flag to true disables such optimization
+  android_full_debug = false
+
+  # Compile in such a way as to make it possible for the profiler to unwind full
+  # stack frames. Setting this flag has a large effect on the performance of the
+  # generated code than just setting profiling, but gives the profiler more
+  # information to analyze.
+  # Requires profiling to be set to true.
+  enable_full_stack_frames_for_profiling = false
+
+  # When we are going to use gold we need to find it.
+  # This is initialized below, after use_gold might have been overridden.
+  gold_path = ""
+
+  # Enable fatal linker warnings. Building Chromium with certain versions
+  # of binutils can cause linker warning.
+  fatal_linker_warnings = true
+
+  # Build with C++ RTTI enabled. Chromium builds without RTTI by default,
+  # but some sanitizers are known to require it, like CFI diagnostics
+  # and UBsan variants.
+  use_rtti = use_cfi_diag || is_ubsan_vptr || is_ubsan_security
+
+  # AFDO (Automatic Feedback Directed Optimizer) is a form of profile-guided
+  # optimization that GCC supports. It used by ChromeOS in their official
+  # builds. To use it, set auto_profile_path to the path to a file containing
+  # the needed gcov profiling data.
+  auto_profile_path = ""
+
+  # Allow projects that wish to stay on C++11 to override Chromium's default.
+  use_cxx11 = false
+
+  # Path to an AFDO profile to use while building with clang, if any. Empty
+  # implies none.
+  clang_sample_profile_path = ""
+
+  # Some configurations have default sample profiles. If this is true and
+  # clang_sample_profile_path is empty, we'll fall back to the default.
+  #
+  # We currently only have default profiles for Chromium in-tree, so we disable
+  # this by default for all downstream projects, since these profiles are likely
+  # nonsensical for said projects.
+  clang_use_default_sample_profile =
+      chrome_pgo_phase == 0 && build_with_chromium && is_official_build &&
+      (is_android || chromeos_is_browser_only || is_chromecast)
+
+  # This configuration is used to select a default profile in Chrome OS based on
+  # the microarchitectures we are using. This is only used if
+  # clang_use_default_sample_profile is true and clang_sample_profile_path is
+  # empty.
+  chromeos_afdo_platform = "atom"
+
+  # Emit debug information for profiling wile building with clang.
+  clang_emit_debug_info_for_profiling = false
+
+  # Turn this on to have the compiler output extra timing information.
+  compiler_timing = false
+
+  # Turn this on to use ghash feature of lld for faster debug link on Windows.
+  # http://blog.llvm.org/2018/01/improving-link-time-on-windows-with.html
+  use_ghash = true
+
+  # Whether to enable ThinLTO optimizations. Turning ThinLTO optimizations on
+  # can substantially increase link time and binary size, but they generally
+  # also make binaries a fair bit faster.
+  #
+  # TODO(gbiv): We disable optimizations by default on most platforms because
+  # the space overhead is too great. We should use some mixture of profiles and
+  # optimization settings to better tune the size increase.
+  thin_lto_enable_optimizations =
+      (is_chromeos_ash || is_android || is_win || is_linux) && is_official_build
+
+  # Initialize all local variables with a pattern. This flag will fill
+  # uninitialized floating-point types (and 32-bit pointers) with 0xFF and the
+  # rest with 0xAA. This makes behavior of uninitialized memory bugs consistent,
+  # recognizable in the debugger, and crashes on memory accesses through
+  # uninitialized pointers.
+  #
+  # TODO(crbug.com/1131993): Enabling this when 'is_android' is true breaks
+  # content_shell_test_apk on both ARM and x86.
+  init_stack_vars = !is_android
+
+  # This argument is to control whether enabling text section splitting in the
+  # final binary. When enabled, the separated text sections with prefix
+  # '.text.hot', '.text.unlikely', '.text.startup' and '.text.exit' will not be
+  # merged to '.text' section. This allows us to identify the hot code section
+  # ('.text.hot') in the binary which may be mlocked or mapped to huge page to
+  # reduce TLB misses which gives performance improvement on cpu usage.
+  # The gold linker by default has text section splitting enabled.
+  use_text_section_splitting = false
+
+  # Token limits may not be accurate for build configs not covered by the CQ,
+  # so only enable them by default for mainstream build configs.
+  enable_wmax_tokens =
+      !is_official_build && !(is_component_build && !is_debug) &&
+      ((is_mac && target_cpu == "x64" && !use_system_xcode) ||
+       (is_linux && !is_chromeos && target_cpu == "x64") ||
+       (is_win && target_cpu == "x86") || (is_win && target_cpu == "x64") ||
+       (is_android && target_cpu == "arm") ||
+       (is_android && target_cpu == "arm64"))
+
+  # Turn off the --call-graph-profile-sort flag for lld by default. Enable
+  # selectively for targets where it's beneficial.
+  enable_call_graph_profile_sort = chrome_pgo_phase == 2
+
+  # Enable DWARF v5.
+  use_dwarf5 = false
+
+  # Override this to put full paths to PDBs in Windows PE files. This helps
+  # windbg and Windows Performance Analyzer with finding the PDBs in some local-
+  # build scenarios. This is never needed for bots or official builds. Because
+  # this puts the output directory in the DLLs/EXEs it breaks build determinism.
+  # Bugs have been reported to the windbg/WPA teams and this workaround will be
+  # removed when they are fixed.
+  use_full_pdb_paths = false
+
+  # Enable -H, which prints the include tree during compilation.
+  # For use by tools/clang/scripts/analyze_includes.py
+  show_includes = false
+}
+
+declare_args() {
+  # C++11 may not be an option if Android test infrastructure is used.
+  use_cxx11_on_android = use_cxx11
+}
+
+declare_args() {
+  # Set to true to use icf, Identical Code Folding.
+  #
+  # icf=all is broken in older golds, see
+  # https://sourceware.org/bugzilla/show_bug.cgi?id=17704
+  # chromeos binutils has been patched with the fix, so always use icf there.
+  # The bug only affects x86 and x64, so we can still use ICF when targeting
+  # other architectures.
+  #
+  # lld doesn't have the bug.
+  use_icf =
+      (is_posix || is_fuchsia) && !is_debug && !using_sanitizer &&
+      !use_clang_coverage && !(is_android && use_order_profiling) &&
+      (use_lld || (use_gold && (is_chromeos_ash || !(target_cpu == "x86" ||
+                                                     target_cpu == "x64"))))
+}
+
+if (is_android || (is_chromeos_ash && is_chromeos_device)) {
+  # Set the path to use orderfile for linking Chrome
+  # Note that this is for using only one orderfile for linking
+  # the Chrome binary/library.
+  declare_args() {
+    chrome_orderfile_path = ""
+
+    if (defined(default_chrome_orderfile)) {
+      # Allow downstream tools to set orderfile path with
+      # another variable.
+      chrome_orderfile_path = default_chrome_orderfile
+    } else if (is_chromeos_ash && is_chromeos_device) {
+      chrome_orderfile_path = "//chromeos/profiles/chromeos.orderfile.txt"
+    }
+  }
+}
+
+assert(!(llvm_force_head_revision && use_goma),
+       "can't use goma with trunk clang")
+assert(!(llvm_force_head_revision && use_rbe), "can't use rbe with trunk clang")
+
+# default_include_dirs ---------------------------------------------------------
+#
+# This is a separate config so that third_party code (which would not use the
+# source root and might have conflicting versions of some headers) can remove
+# this and specify their own include paths.
+config("default_include_dirs") {
+  include_dirs = [
+    "//",
+    root_gen_dir,
+  ]
+}
+
+# Compiler instrumentation can introduce dependencies in DSOs to symbols in
+# the executable they are loaded into, so they are unresolved at link-time.
+config("no_unresolved_symbols") {
+  if (!using_sanitizer &&
+      (is_linux || is_chromeos || is_android || is_fuchsia)) {
+    ldflags = [
+      "-Wl,-z,defs",
+      "-Wl,--as-needed",
+    ]
+  }
+}
+
+# compiler ---------------------------------------------------------------------
+#
+# Base compiler configuration.
+#
+# See also "runtime_library" below for related stuff and a discussion about
+# where stuff should go. Put warning related stuff in the "warnings" config.
+
+config("compiler") {
+  asmflags = []
+  cflags = []
+  cflags_c = []
+  cflags_cc = []
+  cflags_objc = []
+  cflags_objcc = []
+  ldflags = []
+  defines = []
+  configs = []
+
+  # System-specific flags. If your compiler flags apply to one of the
+  # categories here, add it to the associated file to keep this shared config
+  # smaller.
+  if (is_win) {
+    configs += [ "//build/config/win:compiler" ]
+  } else if (is_android) {
+    configs += [ "//build/config/android:compiler" ]
+  } else if (is_linux || is_chromeos) {
+    configs += [ "//build/config/linux:compiler" ]
+    if (is_chromeos_ash) {
+      configs += [ "//build/config/chromeos:compiler" ]
+    }
+  } else if (is_nacl) {
+    configs += [ "//build/config/nacl:compiler" ]
+  } else if (is_mac) {
+    configs += [ "//build/config/mac:compiler" ]
+  } else if (is_ios) {
+    configs += [ "//build/config/ios:compiler" ]
+  } else if (is_fuchsia) {
+    configs += [ "//build/config/fuchsia:compiler" ]
+  } else if (current_os == "aix") {
+    configs += [ "//build/config/aix:compiler" ]
+  }
+
+  configs += [
+    # See the definitions below.
+    ":clang_revision",
+    ":compiler_cpu_abi",
+    ":compiler_codegen",
+    ":compiler_deterministic",
+  ]
+
+  # Here we enable -fno-delete-null-pointer-checks, which makes various nullptr
+  # operations (e.g. dereferencing) into defined behavior. This avoids deletion
+  # of some security-critical code: see https://crbug.com/1139129.
+  # Nacl does not support the flag. And, we still want UBSAN to catch undefined
+  # behavior related to nullptrs, so do not add this flag if UBSAN is enabled.
+  # GCC seems to have some bugs compiling constexpr code when this is defined,
+  # so only enable it if using_clang. See: https://gcc.gnu.org/PR97913
+  # TODO(mpdenton): remove is_clang once GCC bug is fixed.
+  if (!is_nacl && !is_ubsan && is_clang) {
+    cflags += [ "-fno-delete-null-pointer-checks" ]
+  }
+
+  # Don't emit the GCC version ident directives, they just end up in the
+  # .comment section or debug info taking up binary size, and makes comparing
+  # .o files built with different compiler versions harder.
+  if (!is_win || is_clang) {
+    cflags += [ "-fno-ident" ]
+  }
+
+  # In general, Windows is totally different, but all the other builds share
+  # some common compiler and linker configuration.
+  if (!is_win) {
+    # Common POSIX compiler flags setup.
+    # --------------------------------
+    cflags += [ "-fno-strict-aliasing" ]  # See http://crbug.com/32204
+
+    # Stack protection.
+    if (is_mac) {
+      # The strong variant of the stack protector significantly increases
+      # binary size, so only enable it in debug mode.
+      if (is_debug) {
+        cflags += [ "-fstack-protector-strong" ]
+      } else {
+        cflags += [ "-fstack-protector" ]
+      }
+    } else if ((is_posix && !is_chromeos_ash && !is_nacl) || is_fuchsia) {
+      # TODO(phajdan.jr): Use -fstack-protector-strong when our gcc supports it.
+      # See also https://crbug.com/533294
+      cflags += [ "--param=ssp-buffer-size=4" ]
+
+      # The x86 toolchain currently has problems with stack-protector.
+      if (is_android && target_cpu == "x86") {
+        cflags += [ "-fno-stack-protector" ]
+      } else if (current_os != "aix") {
+        # Not available on aix.
+        cflags += [ "-fstack-protector" ]
+      }
+    }
+
+    if (use_lld) {
+      ldflags += [ "-fuse-ld=lld" ]
+      if (lld_path != "") {
+        ldflags += [ "-B$lld_path" ]
+      }
+    }
+
+    # Linker warnings.
+    if (fatal_linker_warnings && !is_apple && current_os != "aix") {
+      ldflags += [ "-Wl,--fatal-warnings" ]
+    }
+    if (fatal_linker_warnings && is_apple) {
+      ldflags += [ "-Wl,-fatal_warnings" ]
+    }
+  }
+
+  if (is_clang && is_debug) {
+    # Allow comparing the address of references and 'this' against 0
+    # in debug builds. Technically, these can never be null in
+    # well-defined C/C++ and Clang can optimize such checks away in
+    # release builds, but they may be used in asserts in debug builds.
+    cflags_cc += [
+      "-Wno-undefined-bool-conversion",
+      "-Wno-tautological-undefined-compare",
+    ]
+  }
+
+  # Non-Mac Posix and Fuchsia compiler flags setup.
+  # -----------------------------------
+  if ((is_posix && !is_apple) || is_fuchsia) {
+    if (enable_profiling) {
+      if (!is_debug) {
+        cflags += [ "-g" ]
+
+        if (enable_full_stack_frames_for_profiling) {
+          cflags += [
+            "-fno-inline",
+            "-fno-optimize-sibling-calls",
+          ]
+        }
+      }
+    }
+
+    # Explicitly pass --build-id to ld. Compilers used to always pass this
+    # implicitly but don't any more (in particular clang when built without
+    # ENABLE_LINKER_BUILD_ID=ON).
+    if (is_official_build) {
+      # The sha1 build id has lower risk of collision but is more expensive to
+      # compute, so only use it in the official build to avoid slowing down
+      # links.
+      ldflags += [ "-Wl,--build-id=sha1" ]
+    } else if (current_os != "aix") {
+      ldflags += [ "-Wl,--build-id" ]
+    }
+
+    if (!is_android) {
+      defines += [
+        # _FILE_OFFSET_BITS=64 should not be set on Android in order to maintain
+        # the behavior of the Android NDK from earlier versions.
+        # See https://android-developers.googleblog.com/2017/09/introducing-android-native-development.html
+        "_FILE_OFFSET_BITS=64",
+        "_LARGEFILE_SOURCE",
+        "_LARGEFILE64_SOURCE",
+      ]
+    }
+
+    if (!is_nacl) {
+      if (exclude_unwind_tables) {
+        cflags += [
+          "-fno-unwind-tables",
+          "-fno-asynchronous-unwind-tables",
+        ]
+        defines += [ "NO_UNWIND_TABLES" ]
+      } else {
+        cflags += [ "-funwind-tables" ]
+      }
+    }
+  }
+
+  # Linux/Android/Fuchsia common flags setup.
+  # ---------------------------------
+  if (is_linux || is_chromeos || is_android || is_fuchsia) {
+    asmflags += [ "-fPIC" ]
+    cflags += [ "-fPIC" ]
+    ldflags += [ "-fPIC" ]
+
+    if (!is_clang) {
+      # Use pipes for communicating between sub-processes. Faster.
+      # (This flag doesn't do anything with Clang.)
+      cflags += [ "-pipe" ]
+    }
+
+    ldflags += [
+      "-Wl,-z,noexecstack",
+      "-Wl,-z,relro",
+    ]
+
+    if (!is_component_build) {
+      ldflags += [ "-Wl,-z,now" ]
+    }
+  }
+
+  # Linux-specific compiler flags setup.
+  # ------------------------------------
+  if ((is_posix || is_fuchsia) && !is_apple && use_lld) {
+    if (target_cpu == "arm64") {
+      # Reduce the page size from 65536 in order to reduce binary size slightly
+      # by shrinking the alignment gap between segments. This also causes all
+      # segments to be mapped adjacently, which breakpad relies on.
+      ldflags += [ "-Wl,-z,max-page-size=4096" ]
+    }
+  } else if (use_gold) {
+    ldflags += [ "-fuse-ld=gold" ]
+    if (!is_android) {
+      # On Android, this isn't needed.  gcc in the NDK knows to look next to
+      # it with -fuse-ld=gold, and clang gets a --gcc-toolchain flag passed
+      # above.
+      if (gold_path != "") {
+        ldflags += [ "-B$gold_path" ]
+      }
+
+      ldflags += [
+        # Experimentation found that using four linking threads
+        # saved ~20% of link time.
+        # https://groups.google.com/a/chromium.org/group/chromium-dev/browse_thread/thread/281527606915bb36
+        # Only apply this to the target linker, since the host
+        # linker might not be gold, but isn't used much anyway.
+        "-Wl,--threads",
+        "-Wl,--thread-count=4",
+      ]
+    }
+
+    # TODO(thestig): Make this flag work with GN.
+    #if (!is_official_build && !is_chromeos && !(is_asan || is_lsan || is_tsan || is_msan)) {
+    #  ldflags += [
+    #    "-Wl,--detect-odr-violations",
+    #  ]
+    #}
+  }
+
+  if (use_icf && !is_apple) {
+    ldflags += [ "-Wl,--icf=all" ]
+  }
+
+  if (is_linux || is_chromeos) {
+    cflags += [ "-pthread" ]
+    # Do not use the -pthread ldflag here since it becomes a no-op
+    # when using -nodefaultlibs, which would cause an unused argument
+    # error.  "-lpthread" is added in //build/config:default_libs.
+  }
+
+  # Clang-specific compiler flags setup.
+  # ------------------------------------
+  if (is_clang) {
+    cflags += [ "-fcolor-diagnostics" ]
+
+    # Enable -fmerge-all-constants. This used to be the default in clang
+    # for over a decade. It makes clang non-conforming, but is fairly safe
+    # in practice and saves some binary size. We might want to consider
+    # disabling this (https://bugs.llvm.org/show_bug.cgi?id=18538#c13),
+    # but for now it looks like our build might rely on it
+    # (https://crbug.com/829795).
+    cflags += [ "-fmerge-all-constants" ]
+  }
+
+  if (use_lld) {
+    # TODO(thakis): Make the driver pass --color-diagnostics to the linker
+    # if -fcolor-diagnostics is passed to it, and pass -fcolor-diagnostics
+    # in ldflags instead.
+    if (is_win) {
+      # On Windows, we call the linker directly, instead of calling it through
+      # the driver.
+      ldflags += [ "--color-diagnostics" ]
+    } else {
+      ldflags += [ "-Wl,--color-diagnostics" ]
+    }
+  }
+
+  # Enable text section splitting only on linux when using lld for now. Other
+  # platforms can be added later if needed.
+  if ((is_linux || is_chromeos) && use_lld && use_text_section_splitting) {
+    ldflags += [ "-Wl,-z,keep-text-section-prefix" ]
+  }
+
+  if (is_clang && !is_nacl && !use_xcode_clang) {
+    cflags += [ "-fcrash-diagnostics-dir=" + clang_diagnostic_dir ]
+
+    # TODO(hans): Remove this once Clang generates better optimized debug info
+    # by default. https://crbug.com/765793
+    cflags += [
+      "-mllvm",
+      "-instcombine-lower-dbg-declare=0",
+    ]
+    if (!is_debug && use_thin_lto && is_a_target_toolchain) {
+      if (is_win) {
+        ldflags += [ "-mllvm:-instcombine-lower-dbg-declare=0" ]
+      } else {
+        ldflags += [ "-Wl,-mllvm,-instcombine-lower-dbg-declare=0" ]
+      }
+    }
+
+    # TODO(crbug.com/1235145): Investigate why/if this should be needed.
+    if (is_win) {
+      cflags += [ "/clang:-ffp-contract=off" ]
+    } else {
+      cflags += [ "-ffp-contract=off" ]
+    }
+  }
+
+  # C11/C++11 compiler flags setup.
+  # ---------------------------
+  if (is_linux || is_chromeos || is_android || (is_nacl && is_clang) ||
+      current_os == "aix") {
+    if (target_os == "android") {
+      cxx11_override = use_cxx11_on_android
+    } else {
+      cxx11_override = use_cxx11
+    }
+
+    if (is_clang) {
+      standard_prefix = "c"
+
+      # Since we build with -std=c* and not -std=gnu*, _GNU_SOURCE will not be
+      # defined by the compiler.  However, lots of code relies on the
+      # non-standard features that _GNU_SOURCE enables, so define it manually.
+      defines += [ "_GNU_SOURCE" ]
+
+      if (is_nacl) {
+        # Undefine __STRICT_ANSI__ to get non-standard features which would
+        # otherwise not be enabled by NaCl's sysroots.
+        cflags += [ "-U__STRICT_ANSI__" ]
+      }
+    } else {
+      # Gcc does not support ##__VA_ARGS__ when in standards-conforming mode,
+      # but we use this feature in several places in Chromium.
+      # TODO(thomasanderson): Replace usages of ##__VA_ARGS__ with the
+      # standard-compliant __VA_OPT__ added by C++20, and switch the gcc build
+      # to -std=c*.
+      standard_prefix = "gnu"
+    }
+
+    cflags_c += [ "-std=${standard_prefix}11" ]
+    if (cxx11_override) {
+      # Override Chromium's default for projects that wish to stay on C++11.
+      cflags_cc += [ "-std=${standard_prefix}++11" ]
+    } else {
+      cflags_cc += [ "-std=${standard_prefix}++14" ]
+    }
+  } else if (!is_win && !is_nacl) {
+    if (target_os == "android") {
+      cxx11_override = use_cxx11_on_android
+    } else {
+      cxx11_override = use_cxx11
+    }
+
+    # TODO(mcgrathr) - the NaCl GCC toolchain doesn't support either gnu11/gnu++11
+    # or c11/c++11; we technically don't need this toolchain any more, but there
+    # are still a few buildbots using it, so until those are turned off
+    # we need the !is_nacl clause and the (is_nacl && is_clang) clause, above.
+    cflags_c += [ "-std=c11" ]
+    if (cxx11_override) {
+      cflags_cc += [ "-std=c++11" ]
+    } else {
+      cflags_cc += [ "-std=c++14" ]
+    }
+  }
+
+  # C++17 removes trigraph support, so preemptively disable trigraphs. This is
+  # especially useful given the collision with ecmascript's logical assignment
+  # operators: https://github.com/tc39/proposal-logical-assignment
+  if (is_clang) {
+    # clang-cl disables trigraphs by default
+    if (!is_win) {
+      # The gnu variants of C++11 and C++14 already disable trigraph support,
+      # but when building with clang, we use -std=c++11 / -std=c++14, which
+      # enables trigraph support: override that here.
+      cflags_cc += [ "-fno-trigraphs" ]
+    }
+
+    # Don't warn that trigraphs are ignored, since trigraphs are disabled
+    # anyway.
+    cflags_cc += [ "-Wno-trigraphs" ]
+  }
+
+  if (is_mac) {
+    # The system libc++ on Mac doesn't have aligned allocation in C++17.
+    defines += [ "_LIBCPP_HAS_NO_ALIGNED_ALLOCATION" ]
+    cflags_cc += [ "-stdlib=libc++" ]
+    ldflags += [ "-stdlib=libc++" ]
+  }
+
+  # Add flags for link-time optimization. These flags enable
+  # optimizations/transformations that require whole-program visibility at link
+  # time, so they need to be applied to all translation units, and we may end up
+  # with miscompiles if only part of the program is compiled with LTO flags. For
+  # that reason, we cannot allow targets to enable or disable these flags, for
+  # example by disabling the optimize configuration.
+  # TODO(pcc): Make this conditional on is_official_build rather than on gn
+  # flags for specific features.
+  if (!is_debug && use_thin_lto && is_a_target_toolchain) {
+    assert(use_lld, "LTO is only supported with lld")
+
+    cflags += [
+      "-flto=thin",
+      "-fsplit-lto-unit",
+    ]
+
+    # Limit the size of the ThinLTO cache to the lesser of 10% of
+    # available disk space, 40GB and 100000 files.
+    cache_policy = "cache_size=10%:cache_size_bytes=40g:cache_size_files=100000"
+
+    # TODO(gbiv): We ideally shouldn't need to specify this; ThinLTO
+    # should be able to better manage binary size increases on its own.
+    import_instr_limit = 5
+
+    if (is_win) {
+      ldflags += [
+        "/opt:lldltojobs=all",
+        "-mllvm:-import-instr-limit=$import_instr_limit",
+        "/lldltocache:" +
+            rebase_path("$root_out_dir/thinlto-cache", root_build_dir),
+        "/lldltocachepolicy:$cache_policy",
+      ]
+    } else {
+      ldflags += [ "-flto=thin" ]
+
+      # Enabling ThinLTO on Chrome OS too, in an effort to reduce the memory
+      # usage in crbug.com/1038040. Note this will increase build time in
+      # Chrome OS.
+
+      # In ThinLTO builds, we run at most one link process at a time,
+      # and let it use all cores.
+      # TODO(thakis): Check if '=0' (that is, number of cores, instead
+      # of "all" which means number of hardware threads) is faster.
+      ldflags += [ "-Wl,--thinlto-jobs=all" ]
+      if (is_mac) {
+        ldflags +=
+            [ "-Wl,-cache_path_lto," +
+              rebase_path("$root_out_dir/thinlto-cache", root_build_dir) ]
+      } else {
+        ldflags +=
+            [ "-Wl,--thinlto-cache-dir=" +
+              rebase_path("$root_out_dir/thinlto-cache", root_build_dir) ]
+      }
+
+      ldflags += [ "-Wl,--thinlto-cache-policy=$cache_policy" ]
+
+      if (is_chromeos_ash) {
+        # Not much performance difference was noted between the default (100)
+        # and these. ARM was originally set lower than x86 to keep the size
+        # bloat of ThinLTO to <10%, but that's potentially no longer true.
+        # FIXME(inglorion): maybe tune these?
+        if (target_cpu == "arm" || target_cpu == "arm64") {
+          import_instr_limit = 20
+        } else {
+          import_instr_limit = 30
+        }
+      }
+
+      ldflags += [ "-Wl,-mllvm,-import-instr-limit=$import_instr_limit" ]
+    }
+
+    # TODO(https://crbug.com/1211155): investigate why this isn't effective on arm32.
+    if (!is_android || target_cpu == "arm64") {
+      cflags += [ "-fwhole-program-vtables" ]
+      if (!is_win) {
+        ldflags += [ "-fwhole-program-vtables" ]
+      }
+    }
+
+    # This flag causes LTO to create an .ARM.attributes section with the correct
+    # architecture. This is necessary because LLD will refuse to link a program
+    # unless the architecture revision in .ARM.attributes is sufficiently new.
+    # TODO(pcc): The contents of .ARM.attributes should be based on the
+    # -march flag passed at compile time (see llvm.org/pr36291).
+    if (target_cpu == "arm") {
+      ldflags += [ "-march=$arm_arch" ]
+    }
+  }
+
+  if (compiler_timing) {
+    if (is_clang && !is_nacl) {
+      cflags += [ "-ftime-trace" ]
+    } else if (is_win) {
+      cflags += [
+        # "Documented" here:
+        # http://aras-p.info/blog/2017/10/23/Best-unknown-MSVC-flag-d2cgsummary/
+        "/d2cgsummary",
+      ]
+    }
+  }
+
+  # Pass flag to LLD so Android builds can allow debuggerd to properly symbolize
+  # stack crashes (http://crbug.com/919499).
+  if (use_lld && is_android) {
+    ldflags += [ "-Wl,--no-rosegment" ]
+  }
+
+  # LLD does call-graph-sorted binary layout by default when profile data is
+  # present. On Android this increases binary size due to more thinks for long
+  # jumps. Turn it off by default and enable selectively for targets where it's
+  # beneficial.
+  if (use_lld && !enable_call_graph_profile_sort) {
+    if (is_win) {
+      ldflags += [ "/call-graph-profile-sort:no" ]
+    } else if (!is_apple) {
+      # TODO(thakis): Once LLD's Mach-O port basically works, implement call
+      # graph profile sorting for it, add an opt-out flag, and pass it here.
+      ldflags += [ "-Wl,--no-call-graph-profile-sort" ]
+    }
+  }
+
+  if (is_clang && !is_nacl && show_includes) {
+    if (is_win) {
+      # TODO(crbug.com/1223741): Goma mixes the -H and /showIncludes output.
+      assert(!use_goma, "show_includes on Windows is not reliable with goma")
+      cflags += [
+        "/clang:-H",
+        "/clang:-fshow-skipped-includes",
+      ]
+    } else {
+      cflags += [
+        "-H",
+        "-fshow-skipped-includes",
+      ]
+    }
+  }
+
+  # This flag enforces that member pointer base types are complete. It helps
+  # prevent us from running into problems in the Microsoft C++ ABI (see
+  # https://crbug.com/847724).
+  # TODO(crbug/1052397): Remove is_chromeos_lacros once lacros-chrome switches
+  # to target_os="chromeos".
+  if (is_clang && !is_nacl && target_os != "chromeos" && !use_xcode_clang &&
+      !is_chromeos_lacros && (is_win || use_custom_libcxx)) {
+    cflags += [ "-fcomplete-member-pointers" ]
+  }
+
+  # Pass the same C/C++ flags to the objective C/C++ compiler.
+  cflags_objc += cflags_c
+  cflags_objcc += cflags_cc
+
+  # Assign any flags set for the C compiler to asmflags so that they are sent
+  # to the assembler. The Windows assembler takes different types of flags
+  # so only do so for posix platforms.
+  if (is_posix || is_fuchsia) {
+    asmflags += cflags
+    asmflags += cflags_c
+  }
+
+  # Rust compiler flags setup.
+  # ---------------------------
+  rustflags = [
+    # Overflow checks are optional in Rust, but even if switched
+    # off they do not cause undefined behavior (the overflowing
+    # behavior is defined). Because containers are bounds-checked
+    # in safe Rust, they also can't provoke buffer overflows.
+    # As such these checks may be less important in Rust than C++.
+    # But in (simplistic) testing they have negligible performance
+    # overhead, and this helps to provide consistent behavior
+    # between different configurations, so we'll keep them on until
+    # we discover a reason to turn them off.
+    "-Coverflow-checks=on",
+
+    # To make Rust .d files compatible with ninja
+    "-Z",
+    "dep-info-omit-d-target",
+  ]
+  if (rust_abi_target != "") {
+    rustflags += [ "--target=$rust_abi_target" ]
+  }
+  if (use_lto_in_rustc_linking) {
+    rustflags += [ "-Clinker-plugin-lto" ]
+  }
+  if (!use_thin_lto) {
+    # Optimization - don't include bitcode if it won't be used.
+    rustflags += [ "-Cembed-bitcode=no" ]
+  }
+}
+
+# The BUILDCONFIG file sets this config on targets by default, which means when
+# building with ThinLTO, no optimization is performed in the link step.
+config("thinlto_optimize_default") {
+  if (!is_debug && use_thin_lto && is_a_target_toolchain) {
+    lto_opt_level = 0
+
+    if (is_win) {
+      ldflags = [ "/opt:lldlto=" + lto_opt_level ]
+    } else {
+      ldflags = [ "-Wl,--lto-O" + lto_opt_level ]
+    }
+  }
+}
+
+# Use this to enable optimization in the ThinLTO link step for select targets
+# when thin_lto_enable_optimizations is set by doing:
+#
+#   configs -= [ "//build/config/compiler:thinlto_optimize_default" ]
+#   configs += [ "//build/config/compiler:thinlto_optimize_max" ]
+#
+# Since it makes linking significantly slower and more resource intensive, only
+# use it on important targets such as the main browser executable or dll.
+config("thinlto_optimize_max") {
+  if (!is_debug && use_thin_lto && is_a_target_toolchain) {
+    if (thin_lto_enable_optimizations) {
+      lto_opt_level = 2
+    } else {
+      lto_opt_level = 0
+    }
+
+    if (is_win) {
+      ldflags = [ "/opt:lldlto=" + lto_opt_level ]
+    } else {
+      ldflags = [ "-Wl,--lto-O" + lto_opt_level ]
+    }
+  }
+}
+
+# This provides the basic options to select the target CPU and ABI.
+# It is factored out of "compiler" so that special cases can use this
+# without using everything that "compiler" brings in.  Options that
+# tweak code generation for a particular CPU do not belong here!
+# See "compiler_codegen", below.
+config("compiler_cpu_abi") {
+  cflags = []
+  ldflags = []
+  defines = []
+
+  if ((is_posix && !is_apple) || is_fuchsia) {
+    # CPU architecture. We may or may not be doing a cross compile now, so for
+    # simplicity we always explicitly set the architecture.
+    if (target_cpu == "x64") {
+      cflags += [
+        "-m64",
+        "-march=$x64_arch",
+        "-msse3",
+      ]
+      ldflags += [ "-m64" ]
+    } else if (target_cpu == "x86") {
+      cflags += [ "-m32" ]
+      ldflags += [ "-m32" ]
+      if (!is_nacl) {
+        cflags += [
+          "-mfpmath=sse",
+          "-msse2",
+        ]
+      }
+    } else if (target_cpu == "arm") {
+      if (is_clang && !is_android && !is_nacl) {
+        cflags += [ "--target=arm-linux-gnueabihf" ]
+        ldflags += [ "--target=arm-linux-gnueabihf" ]
+      }
+      if (!is_nacl) {
+        cflags += [
+          "-march=$arm_arch",
+          "-mfloat-abi=$arm_float_abi",
+        ]
+      }
+      if (arm_tune != "") {
+        cflags += [ "-mtune=$arm_tune" ]
+      }
+    } else if (target_cpu == "arm64") {
+      if (is_clang && !is_android && !is_nacl && !is_fuchsia) {
+        cflags += [ "--target=aarch64-linux-gnu" ]
+        ldflags += [ "--target=aarch64-linux-gnu" ]
+      }
+    } else if (target_cpu == "mipsel" && !is_nacl) {
+      ldflags += [ "-Wl,--hash-style=sysv" ]
+      if (custom_toolchain == "") {
+        if (is_clang) {
+          if (is_android) {
+            cflags += [ "--target=mipsel-linux-android" ]
+            ldflags += [ "--target=mipsel-linux-android" ]
+          } else {
+            cflags += [ "--target=mipsel-linux-gnu" ]
+            ldflags += [ "--target=mipsel-linux-gnu" ]
+          }
+        } else {
+          cflags += [ "-EL" ]
+          ldflags += [ "-EL" ]
+        }
+      }
+
+      if (mips_arch_variant == "r6") {
+        cflags += [ "-mno-odd-spreg" ]
+        ldflags += [ "-mips32r6" ]
+        if (is_clang) {
+          cflags += [
+            "-march=mipsel",
+            "-mcpu=mips32r6",
+          ]
+        } else {
+          cflags += [
+            "-mips32r6",
+            "-Wa,-mips32r6",
+          ]
+          if (is_android) {
+            ldflags += [ "-Wl,-melf32ltsmip" ]
+          }
+        }
+        if (mips_use_msa == true) {
+          cflags += [
+            "-mmsa",
+            "-mfp64",
+          ]
+        }
+      } else if (mips_arch_variant == "r2") {
+        ldflags += [ "-mips32r2" ]
+        if (is_clang) {
+          cflags += [
+            "-march=mipsel",
+            "-mcpu=mips32r2",
+          ]
+        } else {
+          cflags += [
+            "-mips32r2",
+            "-Wa,-mips32r2",
+          ]
+          if (mips_float_abi == "hard" && mips_fpu_mode != "") {
+            cflags += [ "-m$mips_fpu_mode" ]
+          }
+        }
+      } else if (mips_arch_variant == "r1") {
+        ldflags += [ "-mips32" ]
+        if (is_clang) {
+          cflags += [
+            "-march=mipsel",
+            "-mcpu=mips32",
+          ]
+        } else {
+          cflags += [
+            "-mips32",
+            "-Wa,-mips32",
+          ]
+        }
+      } else if (mips_arch_variant == "loongson3") {
+        defines += [ "_MIPS_ARCH_LOONGSON" ]
+        cflags += [
+          "-march=loongson3a",
+          "-mno-branch-likely",
+          "-Wa,-march=loongson3a",
+        ]
+      }
+
+      if (mips_dsp_rev == 1) {
+        cflags += [ "-mdsp" ]
+      } else if (mips_dsp_rev == 2) {
+        cflags += [ "-mdspr2" ]
+      }
+
+      cflags += [ "-m${mips_float_abi}-float" ]
+    } else if (target_cpu == "mips" && !is_nacl) {
+      ldflags += [ "-Wl,--hash-style=sysv" ]
+      if (custom_toolchain == "") {
+        if (is_clang) {
+          cflags += [ "--target=mips-linux-gnu" ]
+          ldflags += [ "--target=mips-linux-gnu" ]
+        } else {
+          cflags += [ "-EB" ]
+          ldflags += [ "-EB" ]
+        }
+      }
+
+      if (mips_arch_variant == "r6") {
+        cflags += [
+          "-mips32r6",
+          "-Wa,-mips32r6",
+        ]
+        if (mips_use_msa == true) {
+          cflags += [
+            "-mmsa",
+            "-mfp64",
+          ]
+        }
+      } else if (mips_arch_variant == "r2") {
+        cflags += [
+          "-mips32r2",
+          "-Wa,-mips32r2",
+        ]
+        if (mips_float_abi == "hard" && mips_fpu_mode != "") {
+          cflags += [ "-m$mips_fpu_mode" ]
+        }
+      } else if (mips_arch_variant == "r1") {
+        cflags += [
+          "-mips32",
+          "-Wa,-mips32",
+        ]
+      }
+
+      if (mips_dsp_rev == 1) {
+        cflags += [ "-mdsp" ]
+      } else if (mips_dsp_rev == 2) {
+        cflags += [ "-mdspr2" ]
+      }
+
+      cflags += [ "-m${mips_float_abi}-float" ]
+    } else if (target_cpu == "mips64el") {
+      cflags += [ "-D__SANE_USERSPACE_TYPES__" ]
+      ldflags += [ "-Wl,--hash-style=sysv" ]
+      if (custom_toolchain == "") {
+        if (is_clang) {
+          if (is_android) {
+            cflags += [ "--target=mips64el-linux-android" ]
+            ldflags += [ "--target=mips64el-linux-android" ]
+          } else {
+            cflags += [ "--target=mips64el-linux-gnuabi64" ]
+            ldflags += [ "--target=mips64el-linux-gnuabi64" ]
+          }
+        } else {
+          cflags += [
+            "-EL",
+            "-mabi=64",
+          ]
+          ldflags += [
+            "-EL",
+            "-mabi=64",
+          ]
+        }
+      }
+
+      if (mips_arch_variant == "r6") {
+        if (is_clang) {
+          cflags += [
+            "-march=mips64el",
+            "-mcpu=mips64r6",
+          ]
+        } else {
+          cflags += [
+            "-mips64r6",
+            "-Wa,-mips64r6",
+          ]
+          ldflags += [ "-mips64r6" ]
+        }
+        if (mips_use_msa == true) {
+          cflags += [
+            "-mmsa",
+            "-mfp64",
+          ]
+        }
+      } else if (mips_arch_variant == "r2") {
+        ldflags += [ "-mips64r2" ]
+        if (is_clang) {
+          cflags += [
+            "-march=mips64el",
+            "-mcpu=mips64r2",
+          ]
+        } else {
+          cflags += [
+            "-mips64r2",
+            "-Wa,-mips64r2",
+          ]
+        }
+      } else if (mips_arch_variant == "loongson3") {
+        defines += [ "_MIPS_ARCH_LOONGSON" ]
+        cflags += [
+          "-march=loongson3a",
+          "-mno-branch-likely",
+          "-Wa,-march=loongson3a",
+        ]
+      }
+    } else if (target_cpu == "mips64") {
+      ldflags += [ "-Wl,--hash-style=sysv" ]
+      if (custom_toolchain == "") {
+        if (is_clang) {
+          cflags += [ "--target=mips64-linux-gnuabi64" ]
+          ldflags += [ "--target=mips64-linux-gnuabi64" ]
+        } else {
+          cflags += [
+            "-EB",
+            "-mabi=64",
+          ]
+          ldflags += [
+            "-EB",
+            "-mabi=64",
+          ]
+        }
+      }
+
+      if (mips_arch_variant == "r6") {
+        cflags += [
+          "-mips64r6",
+          "-Wa,-mips64r6",
+        ]
+        ldflags += [ "-mips64r6" ]
+
+        if (mips_use_msa == true) {
+          cflags += [
+            "-mmsa",
+            "-mfp64",
+          ]
+        }
+      } else if (mips_arch_variant == "r2") {
+        cflags += [
+          "-mips64r2",
+          "-Wa,-mips64r2",
+        ]
+        ldflags += [ "-mips64r2" ]
+      }
+    } else if (target_cpu == "pnacl" && is_nacl_nonsfi) {
+      if (target_cpu == "x86" || target_cpu == "x64") {
+        cflags += [
+          "-arch",
+          "x86-32-nonsfi",
+          "--pnacl-bias=x86-32-nonsfi",
+          "--target=i686-unknown-nacl",
+        ]
+        ldflags += [
+          "-arch",
+          "x86-32-nonsfi",
+          "--target=i686-unknown-nacl",
+        ]
+      } else if (target_cpu == "arm") {
+        cflags += [
+          "-arch",
+          "arm-nonsfi",
+          "-mfloat-abi=hard",
+          "--pnacl-bias=arm-nonsfi",
+          "--target=armv7-unknown-nacl-gnueabihf",
+        ]
+        ldflags += [
+          "-arch",
+          "arm-nonsfi",
+          "--target=armv7-unknown-nacl-gnueabihf",
+        ]
+      }
+    } else if (target_cpu == "ppc64") {
+      if (current_os == "aix") {
+        cflags += [ "-maix64" ]
+        ldflags += [ "-maix64" ]
+      } else {
+        cflags += [ "-m64" ]
+        ldflags += [ "-m64" ]
+      }
+    } else if (target_cpu == "s390x") {
+      cflags += [ "-m64" ]
+      ldflags += [ "-m64" ]
+    }
+  }
+
+  asmflags = cflags
+}
+
+# This provides options to tweak code generation that are necessary
+# for particular Chromium code or for working around particular
+# compiler bugs (or the combination of the two).
+config("compiler_codegen") {
+  configs = []
+  cflags = []
+  ldflags = []
+
+  if (is_nacl) {
+    configs += [ "//build/config/nacl:compiler_codegen" ]
+  }
+
+  if (target_cpu == "arm64" && is_android) {
+    # On arm64 disable outlining for Android. See crbug.com/931297 for more
+    # information.
+    cflags += [ "-mno-outline" ]
+
+    # This can be removed once https://bugs.llvm.org/show_bug.cgi?id=40348
+    # has been resolved, and -mno-outline is obeyed by the linker during
+    # ThinLTO.
+    ldflags += [ "-Wl,-mllvm,-enable-machine-outliner=never" ]
+  }
+
+  asmflags = cflags
+}
+
+# This provides options that make the build deterministic, so that the same
+# revision produces the same output, independent of the name of the build
+# directory and of the computer the build is done on.
+# The relative path from build dir to source dir makes it into the build
+# outputs, so it's recommended that you use a build dir two levels deep
+# (e.g. "out/Release") so that you get the same "../.." path as all the bots
+# in your build outputs.
+config("compiler_deterministic") {
+  cflags = []
+  ldflags = []
+
+  # Eliminate build metadata (__DATE__, __TIME__ and __TIMESTAMP__) for
+  # deterministic build.  See https://crbug.com/314403
+  if (!is_official_build) {
+    if (is_win && !is_clang) {
+      cflags += [
+        "/wd4117",  # Trying to define or undefine a predefined macro.
+        "/D__DATE__=",
+        "/D__TIME__=",
+        "/D__TIMESTAMP__=",
+      ]
+    } else {
+      cflags += [
+        "-Wno-builtin-macro-redefined",
+        "-D__DATE__=",
+        "-D__TIME__=",
+        "-D__TIMESTAMP__=",
+      ]
+    }
+  }
+
+  # Makes builds independent of absolute file path.
+  if (is_clang && strip_absolute_paths_from_debug_symbols) {
+    # If debug option is given, clang includes $cwd in debug info by default.
+    # For such build, this flag generates reproducible obj files even we use
+    # different build directory like "out/feature_a" and "out/feature_b" if
+    # we build same files with same compile flag.
+    # Other paths are already given in relative, no need to normalize them.
+    if (is_nacl) {
+      # TODO(https://crbug.com/1231236): Use -ffile-compilation-dir= here.
+      cflags += [
+        "-Xclang",
+        "-fdebug-compilation-dir",
+        "-Xclang",
+        ".",
+      ]
+    } else {
+      # -ffile-compilation-dir is an alias for both -fdebug-compilation-dir=
+      # and -fcoverage-compilation-dir=.
+      cflags += [ "-ffile-compilation-dir=." ]
+    }
+    if (!is_win) {
+      # We don't use clang -cc1as on Windows (yet? https://crbug.com/762167)
+      asmflags = [ "-Wa,-fdebug-compilation-dir,." ]
+    }
+
+    if (is_win && use_lld) {
+      if (symbol_level == 2 || (is_clang && using_sanitizer)) {
+        # Absolutize source file paths for PDB. Pass the real build directory
+        # if the pdb contains source-level debug information and if linker
+        # reproducibility is not critical.
+        ldflags += [ "/PDBSourcePath:" + rebase_path(root_build_dir) ]
+      } else {
+        # Use a fake fixed base directory for paths in the pdb to make the pdb
+        # output fully deterministic and independent of the build directory.
+        ldflags += [ "/PDBSourcePath:o:\fake\prefix" ]
+      }
+    }
+  }
+
+  # Tells the compiler not to use absolute paths when passing the default
+  # paths to the tools it invokes. We don't want this because we don't
+  # really need it and it can mess up the goma cache entries.
+  if (is_clang && !is_nacl) {
+    cflags += [ "-no-canonical-prefixes" ]
+
+    # Same for links: Let the compiler driver invoke the linker
+    # with a relative path and pass relative paths to built-in
+    # libraries. Not needed on Windows because we call the linker
+    # directly there, not through the compiler driver.
+    # We don't link on goma, so this change is just for cleaner
+    # internal linker invocations, for people who work on the build.
+    if (!is_win) {
+      ldflags += [ "-no-canonical-prefixes" ]
+    }
+  }
+}
+
+config("clang_revision") {
+  if (false && is_clang && clang_base_path == default_clang_base_path) {
+    update_args = [
+      "--print-revision",
+      "--verify-version=$clang_version",
+    ]
+    if (llvm_force_head_revision) {
+      update_args += [ "--llvm-force-head-revision" ]
+    }
+    clang_revision = exec_script("//tools/clang/scripts/update.py",
+                                 update_args,
+                                 "trim string")
+
+    # This is here so that all files get recompiled after a clang roll and
+    # when turning clang on or off. (defines are passed via the command line,
+    # and build system rebuild things when their commandline changes). Nothing
+    # should ever read this define.
+    defines = [ "CR_CLANG_REVISION=\"$clang_revision\"" ]
+  }
+}
+
+config("compiler_arm_fpu") {
+  if (target_cpu == "arm" && !is_ios && !is_nacl) {
+    cflags = [ "-mfpu=$arm_fpu" ]
+    if (!arm_use_thumb) {
+      cflags += [ "-marm" ]
+    }
+    asmflags = cflags
+  }
+}
+
+config("compiler_arm_thumb") {
+  if (target_cpu == "arm" && arm_use_thumb && is_posix &&
+      !(is_apple || is_nacl)) {
+    cflags = [ "-mthumb" ]
+  }
+}
+
+config("compiler_arm") {
+  if (target_cpu == "arm" && (is_chromeos_ash || is_chromeos_lacros)) {
+    # arm is normally the default mode for clang, but on chromeos a wrapper
+    # is used to pass -mthumb, and therefor change the default.
+    cflags = [ "-marm" ]
+  }
+}
+
+# runtime_library -------------------------------------------------------------
+#
+# Sets the runtime library and associated options.
+#
+# How do you determine what should go in here vs. "compiler" above? Consider if
+# a target might choose to use a different runtime library (ignore for a moment
+# if this is possible or reasonable on your system). If such a target would want
+# to change or remove your option, put it in the runtime_library config. If a
+# target wants the option regardless, put it in the compiler config.
+
+config("runtime_library") {
+  configs = []
+
+  # The order of this config is important: it must appear before
+  # android:runtime_library.  This is to ensure libc++ appears before
+  # libandroid_support in the -isystem include order.  Otherwise, there will be
+  # build errors related to symbols declared in math.h.
+  if (use_custom_libcxx) {
+    configs += [ "//build/config/c++:runtime_library" ]
+  }
+
+  # TODO(crbug.com/830987): Come up with a better name for is POSIX + Fuchsia
+  # configuration.
+  if (is_posix || is_fuchsia) {
+    configs += [ "//build/config/posix:runtime_library" ]
+  }
+
+  # System-specific flags. If your compiler flags apply to one of the
+  # categories here, add it to the associated file to keep this shared config
+  # smaller.
+  if (is_win) {
+    configs += [ "//build/config/win:runtime_library" ]
+  } else if (is_linux || is_chromeos) {
+    configs += [ "//build/config/linux:runtime_library" ]
+  } else if (is_ios) {
+    configs += [ "//build/config/ios:runtime_library" ]
+  } else if (is_mac) {
+    configs += [ "//build/config/mac:runtime_library" ]
+  } else if (is_android) {
+    configs += [ "//build/config/android:runtime_library" ]
+  }
+
+  if (is_component_build) {
+    defines = [ "COMPONENT_BUILD" ]
+  }
+}
+
+# default_warnings ------------------------------------------------------------
+#
+# Collects all warning flags that are used by default.  This is used as a
+# subconfig of both chromium_code and no_chromium_code.  This way these
+# flags are guaranteed to appear on the compile command line after -Wall.
+config("default_warnings") {
+  cflags = []
+  cflags_c = []
+  cflags_cc = []
+  ldflags = []
+
+  if (is_win) {
+    if (treat_warnings_as_errors) {
+      cflags += [ "/WX" ]
+    }
+    if (fatal_linker_warnings) {
+      ldflags = [ "/WX" ]
+    }
+
+    cflags += [
+      # Warnings permanently disabled:
+
+      # C4091: 'typedef ': ignored on left of 'X' when no variable is
+      #                    declared.
+      # This happens in a number of Windows headers. Dumb.
+      "/wd4091",
+
+      # C4127: conditional expression is constant
+      # This warning can in theory catch dead code and other problems, but
+      # triggers in far too many desirable cases where the conditional
+      # expression is either set by macros or corresponds some legitimate
+      # compile-time constant expression (due to constant template args,
+      # conditionals comparing the sizes of different types, etc.).  Some of
+      # these can be worked around, but it's not worth it.
+      "/wd4127",
+
+      # C4251: 'identifier' : class 'type' needs to have dll-interface to be
+      #        used by clients of class 'type2'
+      # This is necessary for the shared library build.
+      "/wd4251",
+
+      # C4275:  non dll-interface class used as base for dll-interface class
+      # This points out a potential (but rare) problem with referencing static
+      # fields of a non-exported base, through the base's non-exported inline
+      # functions, or directly. The warning is subtle enough that people just
+      # suppressed it when they saw it, so it's not worth it.
+      "/wd4275",
+
+      # C4312 is a VS 2015 64-bit warning for integer to larger pointer.
+      # TODO(brucedawson): fix warnings, crbug.com/554200
+      "/wd4312",
+
+      # C4324 warns when padding is added to fulfill alignas requirements,
+      # but can trigger in benign cases that are difficult to individually
+      # suppress.
+      "/wd4324",
+
+      # C4351: new behavior: elements of array 'array' will be default
+      #        initialized
+      # This is a silly "warning" that basically just alerts you that the
+      # compiler is going to actually follow the language spec like it's
+      # supposed to, instead of not following it like old buggy versions did.
+      # There's absolutely no reason to turn this on.
+      "/wd4351",
+
+      # C4355: 'this': used in base member initializer list
+      # It's commonly useful to pass |this| to objects in a class' initializer
+      # list.  While this warning can catch real bugs, most of the time the
+      # constructors in question don't attempt to call methods on the passed-in
+      # pointer (until later), and annotating every legit usage of this is
+      # simply more hassle than the warning is worth.
+      "/wd4355",
+
+      # C4503: 'identifier': decorated name length exceeded, name was
+      #        truncated
+      # This only means that some long error messages might have truncated
+      # identifiers in the presence of lots of templates.  It has no effect on
+      # program correctness and there's no real reason to waste time trying to
+      # prevent it.
+      "/wd4503",
+
+      # Warning C4589 says: "Constructor of abstract class ignores
+      # initializer for virtual base class." Disable this warning because it
+      # is flaky in VS 2015 RTM. It triggers on compiler generated
+      # copy-constructors in some cases.
+      "/wd4589",
+
+      # C4611: interaction between 'function' and C++ object destruction is
+      #        non-portable
+      # This warning is unavoidable when using e.g. setjmp/longjmp.  MSDN
+      # suggests using exceptions instead of setjmp/longjmp for C++, but
+      # Chromium code compiles without exception support.  We therefore have to
+      # use setjmp/longjmp for e.g. JPEG decode error handling, which means we
+      # have to turn off this warning (and be careful about how object
+      # destruction happens in such cases).
+      "/wd4611",
+
+      # Warnings to evaluate and possibly fix/reenable later:
+
+      "/wd4100",  # Unreferenced formal function parameter.
+      "/wd4121",  # Alignment of a member was sensitive to packing.
+      "/wd4244",  # Conversion: possible loss of data.
+      "/wd4505",  # Unreferenced local function has been removed.
+      "/wd4510",  # Default constructor could not be generated.
+      "/wd4512",  # Assignment operator could not be generated.
+      "/wd4610",  # Class can never be instantiated, constructor required.
+      "/wd4838",  # Narrowing conversion. Doesn't seem to be very useful.
+      "/wd4995",  # 'X': name was marked as #pragma deprecated
+      "/wd4996",  # Deprecated function warning.
+
+      # These are variable shadowing warnings that are new in VS2015. We
+      # should work through these at some point -- they may be removed from
+      # the RTM release in the /W4 set.
+      "/wd4456",
+      "/wd4457",
+      "/wd4458",
+      "/wd4459",
+
+      # All of our compilers support the extensions below.
+      "/wd4200",  # nonstandard extension used: zero-sized array in struct/union
+      "/wd4201",  # nonstandard extension used: nameless struct/union
+      "/wd4204",  # nonstandard extension used : non-constant aggregate
+                  # initializer
+
+      "/wd4221",  # nonstandard extension used : 'identifier' : cannot be
+                  # initialized using address of automatic variable
+
+      # http://crbug.com/588506 - Conversion suppressions waiting on Clang
+      # -Wconversion.
+      "/wd4245",  # 'conversion' : conversion from 'type1' to 'type2',
+                  # signed/unsigned mismatch
+
+      "/wd4267",  # 'var' : conversion from 'size_t' to 'type', possible loss of
+                  # data
+
+      "/wd4305",  # 'identifier' : truncation from 'type1' to 'type2'
+      "/wd4389",  # 'operator' : signed/unsigned mismatch
+
+      "/wd4702",  # unreachable code
+
+      # http://crbug.com/848979 - MSVC is more conservative than Clang with
+      # regards to variables initialized and consumed in different branches.
+      "/wd4701",  # Potentially uninitialized local variable 'name' used
+      "/wd4703",  # Potentially uninitialized local pointer variable 'name' used
+
+      # http://crbug.com/848979 - Remaining Clang permitted warnings.
+      "/wd4661",  # 'identifier' : no suitable definition provided for explicit
+                  # template instantiation request
+
+      "/wd4706",  # assignment within conditional expression
+                  # MSVC is stricter and requires a boolean expression.
+
+      "/wd4715",  # 'function' : not all control paths return a value'
+                  # MSVC does not analyze switch (enum) for completeness.
+    ]
+
+    cflags_cc += [
+      # Allow "noexcept" annotations even though we compile with exceptions
+      # disabled.
+      "/wd4577",
+    ]
+
+    if (target_cpu == "x86") {
+      cflags += [
+        # VC++ 2015 changes 32-bit size_t truncation warnings from 4244 to
+        # 4267. Example: short TruncTest(size_t x) { return x; }
+        # Since we disable 4244 we need to disable 4267 during migration.
+        # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+        "/wd4267",
+      ]
+    }
+  } else {
+    if (is_apple && !is_nacl) {
+      # When compiling Objective-C, warns if a method is used whose
+      # availability is newer than the deployment target.
+      cflags += [ "-Wunguarded-availability" ]
+    }
+
+    if (is_ios) {
+      # When compiling Objective-C, warns if a selector named via @selector has
+      # not been defined in any visible interface.
+      cflags += [ "-Wundeclared-selector" ]
+    }
+
+    # Suppress warnings about ABI changes on ARM (Clang doesn't give this
+    # warning).
+    if (target_cpu == "arm" && !is_clang) {
+      cflags += [ "-Wno-psabi" ]
+    }
+
+    if (!is_clang) {
+      cflags_cc += [
+        # See comment for -Wno-c++11-narrowing.
+        "-Wno-narrowing",
+      ]
+
+      # -Wno-class-memaccess warns about hash table and vector in blink.
+      # But the violation is intentional.
+      if (!is_nacl) {
+        cflags_cc += [ "-Wno-class-memaccess" ]
+      }
+
+      # -Wunused-local-typedefs is broken in gcc,
+      # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63872
+      cflags += [ "-Wno-unused-local-typedefs" ]
+
+      # Don't warn about "maybe" uninitialized. Clang doesn't include this
+      # in -Wall but gcc does, and it gives false positives.
+      cflags += [ "-Wno-maybe-uninitialized" ]
+      cflags += [ "-Wno-deprecated-declarations" ]
+
+      # -Wcomment gives too many false positives in the case a
+      # backslash ended comment line is followed by a new line of
+      # comments
+      # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61638
+      cflags += [ "-Wno-comments" ]
+
+      # -Wpacked-not-aligned complains all generated mojom-shared-internal.h
+      # files.
+      cflags += [ "-Wno-packed-not-aligned" ]
+    }
+  }
+
+  # Common Clang and GCC warning setup.
+  if (!is_win || is_clang) {
+    cflags += [
+      # Disables.
+      "-Wno-missing-field-initializers",  # "struct foo f = {0};"
+      "-Wno-unused-parameter",  # Unused function parameters.
+    ]
+  }
+
+  if (is_clang) {
+    cflags += [
+      "-Wloop-analysis",
+
+      # TODO(thakis): This used to be implied by -Wno-unused-function,
+      # which we no longer use. Check if it makes sense to remove
+      # this as well. http://crbug.com/316352
+      "-Wno-unneeded-internal-declaration",
+    ]
+
+    # use_xcode_clang only refers to the iOS toolchain, host binaries use
+    # chromium's clang always.
+    if (!is_nacl || is_nacl_saigo) {
+      if (is_win) {
+        # TODO(thakis): https://crbug.com/617318
+        # Currently goma can not handle case sensitiveness for windows well.
+        cflags += [ "-Wno-nonportable-include-path" ]
+
+        # Warns in ATL headers; see https://crbug.com/1208419.
+        cflags += [ "-Wno-null-pointer-subtraction" ]
+      }
+
+      if (current_toolchain == host_toolchain || !use_xcode_clang) {
+        # Flags Xcode 9.2 (Clang clang-900.0.39.2) does not recognize.
+        cflags += [
+          "-Wenum-compare-conditional",
+
+          # An ABI compat warning we don't care about, https://crbug.com/1102157
+          # TODO(thakis): Push this to the (few) targets that need it,
+          # instead of having a global flag.
+          "-Wno-psabi",
+
+          # Ignore warnings about MSVC optimization pragmas.
+          # TODO(thakis): Only for no_chromium_code? http://crbug.com/912662
+          "-Wno-ignored-pragma-optimize",
+
+          # TODO(https://crbug.com/1016945) Clean up, enable.
+          "-Wno-builtin-assume-aligned-alignment",
+        ]
+
+        # NaCl does not support flags from ToT.
+        if (!is_nacl) {
+          cflags += [
+            # TODO(https://crbug.com/1203071): Clean up and enable.
+            "-Wno-unused-but-set-parameter",
+            "-Wno-unused-but-set-variable",
+          ]
+        }
+
+        if (is_fuchsia) {
+          # TODO(https://bugs.chromium.org/p/fuchsia/issues/detail?id=77383)
+          cflags += [ "-Wno-deprecated-copy" ]
+        }
+
+        if (enable_wmax_tokens) {
+          cflags += [ "-Wmax-tokens" ]
+        }
+      }
+    }
+  }
+}
+
+# chromium_code ---------------------------------------------------------------
+#
+# Toggles between higher and lower warnings for code that is (or isn't)
+# part of Chromium.
+
+config("chromium_code") {
+  if (is_win) {
+    cflags = [ "/W4" ]  # Warning level 4.
+
+    if (is_clang) {
+      # Opt in to additional [[nodiscard]] on standard library methods.
+      defines = [ "_HAS_NODISCARD" ]
+    }
+  } else {
+    cflags = [ "-Wall" ]
+    if (treat_warnings_as_errors) {
+      cflags += [ "-Werror" ]
+
+      # The compiler driver can sometimes (rarely) emit warnings before calling
+      # the actual linker.  Make sure these warnings are treated as errors as
+      # well.
+      ldflags = [ "-Werror" ]
+    }
+    if (is_clang) {
+      # Enable extra warnings for chromium_code when we control the compiler.
+      cflags += [ "-Wextra" ]
+    }
+
+    # In Chromium code, we define __STDC_foo_MACROS in order to get the
+    # C99 macros on Mac and Linux.
+    defines = [
+      "__STDC_CONSTANT_MACROS",
+      "__STDC_FORMAT_MACROS",
+    ]
+
+    if (!is_debug && !using_sanitizer && target_cpu != "s390x" &&
+        target_cpu != "s390" && target_cpu != "ppc64" &&
+        target_cpu != "mips" && target_cpu != "mips64") {
+      # Non-chromium code is not guaranteed to compile cleanly with
+      # _FORTIFY_SOURCE. Also, fortified build may fail when optimizations are
+      # disabled, so only do that for Release build.
+      defines += [ "_FORTIFY_SOURCE=2" ]
+    }
+
+    if (is_mac) {
+      cflags_objc = [ "-Wobjc-missing-property-synthesis" ]
+      cflags_objcc = [ "-Wobjc-missing-property-synthesis" ]
+    }
+
+    if (is_ios) {
+      cflags_objc = [ "-Wimplicit-retain-self" ]
+      cflags_objcc = cflags_objc
+    }
+  }
+
+  if (is_clang) {
+    cflags += [
+      # Warn on missing break statements at the end of switch cases.
+      # For intentional fallthrough, use FALLTHROUGH; from
+      # base/compiler_specific.h
+      "-Wimplicit-fallthrough",
+    ]
+
+    # TODO(thakis): Enable this more often, https://crbug.com/346399
+    # use_libfuzzer: https://crbug.com/1063180
+    if (!is_nacl && !use_libfuzzer) {
+      cflags += [ "-Wunreachable-code-aggressive" ]
+    }
+
+    # Thread safety analysis is broken under nacl: https://crbug.com/982423.
+    if (!is_nacl) {
+      cflags += [
+        # Thread safety analysis. See base/thread_annotations.h and
+        # https://clang.llvm.org/docs/ThreadSafetyAnalysis.html
+        "-Wthread-safety",
+      ]
+    }
+
+    # TODO(thakis): Enable this for more platforms, https://crbug.com/926235
+    # ChromeOS: http://crbug.com/940863
+    # Chromecast: http://crbug.com/942554
+    has_dchecks = is_debug || dcheck_always_on
+    if (!has_dchecks && is_chromeos_ash && is_chrome_branded) {
+      # Temporarily disable -Wextra-semi for Chrome on Chrome OS.
+    } else if (is_chromecast && chromecast_branding != "public") {
+      # Temporarily disable -Wextra-semi for Chromecast.
+    } else {
+      cflags += [ "-Wextra-semi" ]
+    }
+  }
+
+  configs = [ ":default_warnings" ]
+}
+
+config("no_chromium_code") {
+  cflags = []
+  cflags_cc = []
+  defines = []
+
+  if (is_win) {
+    cflags += [
+      "/W3",  # Warning level 3.
+      "/wd4800",  # Disable warning when forcing value to bool.
+      "/wd4267",  # TODO(jschuh): size_t to int.
+      "/wd4996",  # Deprecated function warning.
+    ]
+    defines += [
+      "_CRT_NONSTDC_NO_WARNINGS",
+      "_CRT_NONSTDC_NO_DEPRECATE",
+    ]
+  } else {
+    # GCC may emit unsuppressible warnings so don't add -Werror for no chromium
+    # code. crbug.com/589724
+    if (treat_warnings_as_errors && is_clang) {
+      cflags += [ "-Werror" ]
+      ldflags = [ "-Werror" ]
+    }
+    if (is_clang && !is_nacl) {
+      # TODO(thakis): Remove !is_nacl once
+      # https://codereview.webrtc.org/1552863002/ made its way into chromium.
+      cflags += [ "-Wall" ]
+    }
+  }
+
+  if (is_clang) {
+    cflags += [
+      # Lots of third-party libraries have unused variables. Instead of
+      # suppressing them individually, we just blanket suppress them here.
+      "-Wno-unused-variable",
+
+      # Similarly, we're not going to fix all the C++11 narrowing issues in
+      # third-party libraries.
+      "-Wno-c++11-narrowing",
+    ]
+    if (!is_nacl && (current_toolchain == host_toolchain || !use_xcode_clang)) {
+      cflags += [
+        # TODO(https://crbug.com/1202159): Clean up and enable.
+        "-Wno-misleading-indentation",
+      ]
+    }
+  }
+
+  configs = [ ":default_warnings" ]
+}
+
+# noshadowing -----------------------------------------------------------------
+#
+# Allows turning -Wshadow on.
+
+config("noshadowing") {
+  # This flag has to be disabled for nacl because the nacl compiler is too
+  # strict about shadowing.
+  if (is_clang && !is_nacl) {
+    cflags = [ "-Wshadow" ]
+  }
+}
+
+# rtti ------------------------------------------------------------------------
+#
+# Allows turning Run-Time Type Identification on or off.
+
+config("rtti") {
+  if (is_win) {
+    cflags_cc = [ "/GR" ]
+  } else {
+    cflags_cc = [ "-frtti" ]
+  }
+}
+
+config("no_rtti") {
+  # Some sanitizer configs may require RTTI to be left enabled globally
+  if (!use_rtti) {
+    if (is_win) {
+      cflags_cc = [ "/GR-" ]
+    } else {
+      cflags_cc = [ "-fno-rtti" ]
+      cflags_objcc = cflags_cc
+    }
+  }
+}
+
+# export_dynamic ---------------------------------------------------------------
+#
+# Ensures all exported symbols are added to the dynamic symbol table.  This is
+# necessary to expose Chrome's custom operator new() and operator delete() (and
+# other memory-related symbols) to libraries.  Otherwise, they might
+# (de)allocate memory on a different heap, which would spell trouble if pointers
+# to heap-allocated memory are passed over shared library boundaries.
+config("export_dynamic") {
+  # TODO(crbug.com/1052397): Revisit after target_os flip is completed.
+  if (is_linux || is_bsd || is_chromeos_lacros || export_libcxxabi_from_executables) {
+    ldflags = [ "-rdynamic" ]
+  }
+}
+
+# thin_archive -----------------------------------------------------------------
+#
+# Enables thin archives on posix, and on windows when the lld linker is used.
+# Regular archives directly include the object files used to generate it.
+# Thin archives merely reference the object files.
+# This makes building them faster since it requires less disk IO, but is
+# inappropriate if you wish to redistribute your static library.
+# This config is added to the global config, so thin archives should already be
+# enabled.  If you want to make a distributable static library, you need to do 2
+# things:
+# 1. Set complete_static_lib so that all dependencies of the library make it
+#    into the library. See `gn help complete_static_lib` for details.
+# 2. Remove the thin_archive config, so that the .a file actually contains all
+#    .o files, instead of just references to .o files in the build directoy
+config("thin_archive") {
+  # The macOS and iOS default linker ld64 does not support reading thin
+  # archives.
+  # TODO(crbug.com/1221615): Enable on is_apple if use_lld once that no longer
+  # confuses lldb.
+  if ((is_posix && !is_nacl && !is_apple) || is_fuchsia) {
+    arflags = [ "-T" ]
+  } else if (is_win && use_lld) {
+    arflags = [ "/llvmlibthin" ]
+  }
+}
+
+# exceptions -------------------------------------------------------------------
+#
+# Allows turning Exceptions on or off.
+# Note: exceptions are disallowed in Google code.
+
+config("exceptions") {
+  if (is_win) {
+    # Enables exceptions in the STL.
+    if (!use_custom_libcxx) {
+      defines = [ "_HAS_EXCEPTIONS=1" ]
+    }
+    cflags_cc = [ "/EHsc" ]
+  } else {
+    cflags_cc = [ "-fexceptions" ]
+    cflags_objcc = cflags_cc
+  }
+}
+
+config("no_exceptions") {
+  if (is_win) {
+    # Disables exceptions in the STL.
+    # libc++ uses the __has_feature macro to control whether to use exceptions,
+    # so defining this macro is unnecessary. Defining _HAS_EXCEPTIONS to 0 also
+    # breaks libc++ because it depends on MSVC headers that only provide certain
+    # declarations if _HAS_EXCEPTIONS is 1. Those MSVC headers do not use
+    # exceptions, despite being conditional on _HAS_EXCEPTIONS.
+    if (!use_custom_libcxx) {
+      defines = [ "_HAS_EXCEPTIONS=0" ]
+    }
+  } else {
+    cflags_cc = [ "-fno-exceptions" ]
+    cflags_objcc = cflags_cc
+  }
+}
+
+# Warnings ---------------------------------------------------------------------
+
+# Generate a warning for code that might emit a static initializer.
+# See: //docs/static_initializers.md
+# See: https://groups.google.com/a/chromium.org/d/topic/chromium-dev/B9Q5KTD7iCo/discussion
+config("wglobal_constructors") {
+  if (is_clang) {
+    cflags = [ "-Wglobal-constructors" ]
+  }
+}
+
+# This will generate warnings when using Clang if code generates exit-time
+# destructors, which will slow down closing the program.
+# TODO(thakis): Make this a blocklist instead, http://crbug.com/101600
+config("wexit_time_destructors") {
+  if (is_clang) {
+    cflags = [ "-Wexit-time-destructors" ]
+  }
+}
+
+# Some code presumes that pointers to structures/objects are compatible
+# regardless of whether what they point to is already known to be valid.
+# gcc 4.9 and earlier had no way of suppressing this warning without
+# suppressing the rest of them.  Here we centralize the identification of
+# the gcc 4.9 toolchains.
+config("no_incompatible_pointer_warnings") {
+  cflags = []
+  if (is_clang) {
+    cflags += [ "-Wno-incompatible-pointer-types" ]
+  } else if (target_cpu == "mipsel" || target_cpu == "mips64el") {
+    cflags += [ "-w" ]
+  } else if (is_chromeos_ash && target_cpu == "arm") {
+    cflags += [ "-w" ]
+  }
+}
+
+# Optimization -----------------------------------------------------------------
+#
+# The BUILDCONFIG file sets the "default_optimization" config on targets by
+# default. It will be equivalent to either "optimize" (release) or
+# "no_optimize" (debug) optimization configs.
+#
+# You can override the optimization level on a per-target basis by removing the
+# default config and then adding the named one you want:
+#
+#   configs -= [ "//build/config/compiler:default_optimization" ]
+#   configs += [ "//build/config/compiler:optimize_max" ]
+
+# Shared settings for both "optimize" and "optimize_max" configs.
+# IMPORTANT: On Windows "/O1" and "/O2" must go before the common flags.
+if (is_win) {
+  common_optimize_on_cflags = [
+    "/Ob2",  # Both explicit and auto inlining.
+    "/Oy-",  # Disable omitting frame pointers, must be after /O2.
+    "/Zc:inline",  # Remove unreferenced COMDAT (faster links).
+  ]
+  if (!is_asan) {
+    common_optimize_on_cflags += [
+      # Put data in separate COMDATs. This allows the linker
+      # to put bit-identical constants at the same address even if
+      # they're unrelated constants, which saves binary size.
+      # This optimization can't be used when ASan is enabled because
+      # it is not compatible with the ASan ODR checker.
+      "/Gw",
+    ]
+  }
+  common_optimize_on_ldflags = []
+
+  # /OPT:ICF is not desirable in Debug builds, since code-folding can result in
+  # misleading symbols in stack traces.
+  if (!is_debug && !is_component_build) {
+    common_optimize_on_ldflags += [ "/OPT:ICF" ]  # Redundant COMDAT folding.
+  }
+
+  if (is_official_build) {
+    common_optimize_on_ldflags += [ "/OPT:REF" ]  # Remove unreferenced data.
+    # TODO(thakis): Add LTO/PGO clang flags eventually, https://crbug.com/598772
+  }
+} else {
+  common_optimize_on_cflags = []
+  common_optimize_on_ldflags = []
+
+  if (is_android) {
+    # TODO(jdduke) Re-enable on mips after resolving linking
+    # issues with libc++ (crbug.com/456380).
+    if (target_cpu != "mipsel" && target_cpu != "mips64el") {
+      common_optimize_on_ldflags += [
+        # Warn in case of text relocations.
+        "-Wl,--warn-shared-textrel",
+      ]
+    }
+  }
+
+  if (is_apple) {
+    common_optimize_on_ldflags += [ "-Wl,-dead_strip" ]
+
+    if (is_official_build) {
+      common_optimize_on_ldflags += [
+        "-Wl,-no_data_in_code_info",
+        "-Wl,-no_function_starts",
+      ]
+    }
+  } else if (current_os != "aix") {
+    # Non-Mac Posix flags.
+    # Aix does not support these.
+
+    common_optimize_on_cflags += [
+      # Put data and code in their own sections, so that unused symbols
+      # can be removed at link time with --gc-sections.
+      "-fdata-sections",
+      "-ffunction-sections",
+    ]
+    if (!is_nacl && is_clang) {
+      # We don't care about unique section names, this makes object files a bit
+      # smaller.
+      common_optimize_on_cflags += [ "-fno-unique-section-names" ]
+    }
+
+    common_optimize_on_ldflags += [
+      # Specifically tell the linker to perform optimizations.
+      # See http://lwn.net/Articles/192624/ .
+      # -O2 enables string tail merge optimization in gold and lld.
+      "-Wl,-O2",
+      "-Wl,--gc-sections",
+    ]
+  }
+}
+
+config("default_stack_frames") {
+  if (is_posix || is_fuchsia) {
+    if (enable_frame_pointers) {
+      cflags = [ "-fno-omit-frame-pointer" ]
+
+      # Omit frame pointers for leaf functions on x86, otherwise building libyuv
+      # gives clang's register allocator issues, see llvm.org/PR15798 /
+      # crbug.com/233709
+      if (is_clang && target_cpu == "x86" && !is_apple) {
+        cflags += [ "-momit-leaf-frame-pointer" ]
+      }
+    } else {
+      cflags = [ "-fomit-frame-pointer" ]
+    }
+  }
+  # On Windows, the flag to enable framepointers "/Oy-" must always come after
+  # the optimization flag [e.g. "/O2"]. The optimization flag is set by one of
+  # the "optimize" configs, see rest of this file. The ordering that cflags are
+  # applied is well-defined by the GN spec, and there is no way to ensure that
+  # cflags set by "default_stack_frames" is applied after those set by an
+  # "optimize" config. Similarly, there is no way to propagate state from this
+  # config into the "optimize" config. We always apply the "/Oy-" config in the
+  # definition for common_optimize_on_cflags definition, even though this may
+  # not be correct.
+}
+
+# Default "optimization on" config.
+config("optimize") {
+  if (is_win) {
+    if (chrome_pgo_phase != 2) {
+      # Favor size over speed, /O1 must be before the common flags.
+      # /O1 implies /Os and /GF.
+      cflags = [ "/O1" ] + common_optimize_on_cflags + [ "/Oi" ]
+    } else {
+      # PGO requires all translation units to be compiled with /O2. The actual
+      # optimization level will be decided based on the profiling data.
+      cflags = [ "/O2" ] + common_optimize_on_cflags + [ "/Oi" ]
+    }
+  } else if (optimize_for_size && !is_nacl) {
+    # Favor size over speed.
+    # TODO(crbug.com/718650): Fix -Os in PNaCl compiler and remove the is_nacl
+    # guard above.
+    if (is_clang) {
+      cflags = [ "-Oz" ] + common_optimize_on_cflags
+    } else {
+      cflags = [ "-Os" ] + common_optimize_on_cflags
+    }
+  } else if (is_chromeos_ash) {
+    # TODO(gbiv): This is partially favoring size over speed. CrOS exclusively
+    # uses clang, and -Os in clang is more of a size-conscious -O2 than "size at
+    # any cost" (AKA -Oz). It'd be nice to:
+    # - Make `optimize_for_size` apply to all platforms where we're optimizing
+    #   for size by default (so, also Windows)
+    # - Investigate -Oz here, maybe just for ARM?
+    cflags = [ "-Os" ] + common_optimize_on_cflags
+  } else {
+    cflags = [ "-O2" ] + common_optimize_on_cflags
+  }
+  if (optimize_for_size) {
+    rustflags = [ "-Copt-level=s" ]
+  } else {
+    rustflags = [ "-Copt-level=3" ]
+  }
+  ldflags = common_optimize_on_ldflags
+}
+
+# Turn off optimizations.
+config("no_optimize") {
+  if (is_win) {
+    cflags = [
+      "/Od",  # Disable optimization.
+      "/Ob0",  # Disable all inlining (on by default).
+      "/GF",  # Enable string pooling (off by default).
+    ]
+
+    if (target_cpu == "arm64") {
+      # Disable omitting frame pointers for no_optimize build because stack
+      # traces on Windows ARM64 rely on it.
+      cflags += [ "/Oy-" ]
+    }
+  } else if (is_android && !android_full_debug) {
+    # On Android we kind of optimize some things that don't affect debugging
+    # much even when optimization is disabled to get the binary size down.
+    if (is_clang) {
+      cflags = [ "-Oz" ] + common_optimize_on_cflags
+    } else {
+      cflags = [ "-Os" ] + common_optimize_on_cflags
+    }
+
+    if (!is_component_build) {
+      # Required for library partitions. Without this all symbols just end up
+      # in the base partition.
+      ldflags = [ "-Wl,--gc-sections" ]
+    }
+  } else if (is_fuchsia) {
+    # On Fuchsia, we optimize for size here to reduce the size of debug build
+    # packages so they can be run in a KVM. See crbug.com/910243 for details.
+    cflags = [ "-Og" ]
+  } else {
+    cflags = [ "-O0" ]
+    ldflags = []
+  }
+}
+
+# Turns up the optimization level. On Windows, this implies whole program
+# optimization and link-time code generation which is very expensive and should
+# be used sparingly.
+config("optimize_max") {
+  if (is_nacl && is_nacl_irt) {
+    # The NaCl IRT is a special case and always wants its own config.
+    # Various components do:
+    #   if (!is_debug) {
+    #     configs -= [ "//build/config/compiler:default_optimization" ]
+    #     configs += [ "//build/config/compiler:optimize_max" ]
+    #   }
+    # So this config has to have the selection logic just like
+    # "default_optimization", below.
+    configs = [ "//build/config/nacl:irt_optimize" ]
+  } else {
+    ldflags = common_optimize_on_ldflags
+    if (is_win) {
+      # Favor speed over size, /O2 must be before the common flags.
+      # /O2 implies /Ot, /Oi, and /GF.
+      cflags = [ "/O2" ] + common_optimize_on_cflags
+    } else if (optimize_for_fuzzing) {
+      cflags = [ "-O1" ] + common_optimize_on_cflags
+    } else {
+      cflags = [ "-O2" ] + common_optimize_on_cflags
+    }
+    rustflags = [ "-Copt-level=3" ]
+  }
+}
+
+# This config can be used to override the default settings for per-component
+# and whole-program optimization, optimizing the particular target for speed
+# instead of code size. This config is exactly the same as "optimize_max"
+# except that we use -O3 instead of -O2 on non-win, non-IRT platforms.
+#
+# TODO(crbug.com/621335) - rework how all of these configs are related
+# so that we don't need this disclaimer.
+config("optimize_speed") {
+  if (is_nacl && is_nacl_irt) {
+    # The NaCl IRT is a special case and always wants its own config.
+    # Various components do:
+    #   if (!is_debug) {
+    #     configs -= [ "//build/config/compiler:default_optimization" ]
+    #     configs += [ "//build/config/compiler:optimize_max" ]
+    #   }
+    # So this config has to have the selection logic just like
+    # "default_optimization", below.
+    configs = [ "//build/config/nacl:irt_optimize" ]
+  } else {
+    ldflags = common_optimize_on_ldflags
+    if (is_win) {
+      # Favor speed over size, /O2 must be before the common flags.
+      # /O2 implies /Ot, /Oi, and /GF.
+      cflags = [ "/O2" ] + common_optimize_on_cflags
+    } else if (optimize_for_fuzzing) {
+      cflags = [ "-O1" ] + common_optimize_on_cflags
+    } else {
+      cflags = [ "-O3" ] + common_optimize_on_cflags
+    }
+    rustflags = [ "-Copt-level=3" ]
+  }
+}
+
+config("optimize_fuzzing") {
+  cflags = [ "-O1" ] + common_optimize_on_cflags
+  rustflags = [ "-Copt-level=1" ]
+  ldflags = common_optimize_on_ldflags
+  visibility = [ ":default_optimization" ]
+}
+
+# The default optimization applied to all targets. This will be equivalent to
+# either "optimize" or "no_optimize", depending on the build flags.
+config("default_optimization") {
+  if (is_nacl && is_nacl_irt) {
+    # The NaCl IRT is a special case and always wants its own config.
+    # It gets optimized the same way regardless of the type of build.
+    configs = [ "//build/config/nacl:irt_optimize" ]
+  } else if (is_debug) {
+    configs = [ ":no_optimize" ]
+  } else if (optimize_for_fuzzing) {
+    assert(!is_win, "Fuzzing optimize level not supported on Windows")
+
+    # Coverage build is quite slow. Using "optimize_for_fuzzing" makes it even
+    # slower as it uses "-O1" instead of "-O3". Prevent that from happening.
+    assert(!use_clang_coverage,
+           "optimize_for_fuzzing=true should not be used with " +
+               "use_clang_coverage=true.")
+    configs = [ ":optimize_fuzzing" ]
+  } else {
+    configs = [ ":optimize" ]
+  }
+}
+
+_clang_sample_profile = ""
+if (is_clang && is_a_target_toolchain) {
+  if (clang_sample_profile_path != "") {
+    _clang_sample_profile = clang_sample_profile_path
+  } else if (clang_use_default_sample_profile) {
+    assert(build_with_chromium,
+           "Our default profiles currently only apply to Chromium")
+    assert(is_android || is_chromeos_lacros || is_chromeos_ash || is_chromecast,
+           "The current platform has no default profile")
+    if (is_android || is_chromecast) {
+      _clang_sample_profile = "//chrome/android/profiles/afdo.prof"
+    } else {
+      assert(chromeos_afdo_platform == "atom" ||
+                 chromeos_afdo_platform == "bigcore",
+             "Only atom and bigcore are valid Chrome OS profiles.")
+      _clang_sample_profile =
+          "//chromeos/profiles/${chromeos_afdo_platform}.afdo.prof"
+    }
+  }
+}
+
+# Clang offers a way to assert that AFDO profiles are accurate, which causes it
+# to optimize functions not represented in a profile more aggressively for size.
+# This config can be toggled in cases where shaving off binary size hurts
+# performance too much.
+config("afdo_optimize_size") {
+  if (_clang_sample_profile != "" && sample_profile_is_accurate) {
+    cflags = [ "-fprofile-sample-accurate" ]
+  }
+}
+
+# GCC and clang support a form of profile-guided optimization called AFDO.
+# There are some targeted places that AFDO regresses (and an icky interaction
+# between //base/allocator:tcmalloc and AFDO on GCC), so we provide a separate
+# config to allow AFDO to be disabled per-target.
+config("afdo") {
+  if (is_clang) {
+    cflags = []
+    if (clang_emit_debug_info_for_profiling) {
+      # Add the following flags to generate debug info for profiling.
+      cflags += [ "-gline-tables-only" ]
+      if (!is_nacl) {
+        cflags += [ "-fdebug-info-for-profiling" ]
+      }
+    }
+    if (_clang_sample_profile != "") {
+      assert(chrome_pgo_phase == 0, "AFDO can't be used in PGO builds")
+      rebased_clang_sample_profile =
+          rebase_path(_clang_sample_profile, root_build_dir)
+      cflags += [ "-fprofile-sample-use=${rebased_clang_sample_profile}" ]
+      inputs = [ _clang_sample_profile ]
+    }
+  } else if (auto_profile_path != "" && is_a_target_toolchain) {
+    cflags = [ "-fauto-profile=${auto_profile_path}" ]
+    inputs = [ auto_profile_path ]
+  }
+}
+
+# Symbols ----------------------------------------------------------------------
+
+# The BUILDCONFIG file sets the "default_symbols" config on targets by
+# default. It will be equivalent to one the three specific symbol levels.
+#
+# You can override the symbol level on a per-target basis by removing the
+# default config and then adding the named one you want:
+#
+#   configs -= [ "//build/config/compiler:default_symbols" ]
+#   configs += [ "//build/config/compiler:symbols" ]
+
+# A helper config that all configs passing /DEBUG to the linker should
+# include as sub-config.
+config("win_pdbaltpath") {
+  visibility = [
+    ":minimal_symbols",
+    ":symbols",
+  ]
+
+  # /DEBUG causes the linker to generate a pdb file, and to write the absolute
+  # path to it in the executable file it generates.  This flag turns that
+  # absolute path into just the basename of the pdb file, which helps with
+  # build reproducibility. Debuggers look for pdb files next to executables,
+  # so there's minimal downside to always using this. However, post-mortem
+  # debugging of Chromium crash dumps and ETW tracing can be complicated by this
+  # switch so an option to omit it is important.
+  if (!use_full_pdb_paths) {
+    ldflags = [ "/pdbaltpath:%_PDB%" ]
+  }
+}
+
+# Full symbols.
+config("symbols") {
+  if (is_win) {
+    if (is_clang) {
+      cflags = [ "/Z7" ]  # Debug information in the .obj files.
+    } else {
+      cflags = [ "/Zi" ]  # Produce PDB file, no edit and continue.
+    }
+
+    if (is_clang && use_lld && use_ghash) {
+      cflags += [ "-gcodeview-ghash" ]
+      ldflags = [ "/DEBUG:GHASH" ]
+    } else {
+      ldflags = [ "/DEBUG" ]
+    }
+
+    # All configs using /DEBUG should include this:
+    configs = [ ":win_pdbaltpath" ]
+  } else {
+    cflags = []
+    if (is_mac && enable_dsyms) {
+      # If generating dSYMs, specify -fno-standalone-debug. This was
+      # originally specified for https://crbug.com/479841 because dsymutil
+      # could not handle a 4GB dSYM file. But dsymutil from Xcodes prior to
+      # version 7 also produces debug data that is incompatible with Breakpad
+      # dump_syms, so this is still required (https://crbug.com/622406).
+      cflags += [ "-fno-standalone-debug" ]
+    } else if (is_mac && !use_dwarf5) {
+      # clang defaults to DWARF2 on macOS unless mac_deployment_target is
+      # at least 10.11.
+      # TODO(thakis): Remove this once mac_deployment_target is 10.11.
+      cflags += [ "-gdwarf-4" ]
+    }
+
+    if (use_dwarf5 && !is_nacl) {
+      cflags += [ "-gdwarf-5" ]
+    }
+
+    # The gcc-based nacl compilers don't support -fdebug-compilation-dir (see
+    # elsewhere in this file), so they can't have build-dir-independent output.
+    # Disable symbols for nacl object files to get deterministic,
+    # build-directory-independent output. pnacl and nacl-clang do support that
+    # flag, so we can use use -g1 for pnacl and nacl-clang compiles.
+    # gcc nacl is is_nacl && !is_clang, pnacl and nacl-clang are && is_clang.
+    if (!is_nacl || is_clang) {
+      cflags += [ "-g2" ]
+    }
+
+    if (!is_nacl && is_clang && !is_tsan && !is_asan) {
+      # gcc generates dwarf-aranges by default on -g1 and -g2. On clang it has
+      # to be manually enabled.
+      #
+      # It is skipped in tsan and asan because enabling it causes some
+      # formatting changes in the output which would require fixing bunches
+      # of expectation regexps.
+      cflags += [ "-gdwarf-aranges" ]
+    }
+
+    if (is_apple) {
+      swiftflags = [ "-g" ]
+    }
+
+    if (use_debug_fission) {
+      cflags += [ "-gsplit-dwarf" ]
+    }
+    asmflags = cflags
+    ldflags = []
+
+    # Split debug info with all thinlto builds except nacl and apple.
+    # thinlto requires -gsplit-dwarf in ldflags.
+    if (use_debug_fission && use_thin_lto && !is_nacl && !is_apple) {
+      ldflags += [ "-gsplit-dwarf" ]
+    }
+
+    # TODO(thakis): Figure out if there's a way to make this go for 32-bit,
+    # currently we get "warning:
+    # obj/native_client/src/trusted/service_runtime/sel_asm/nacl_switch_32.o:
+    # DWARF info may be corrupt; offsets in a range list entry are in different
+    # sections" there.  Maybe just a bug in nacl_switch_32.S.
+    if (!is_apple && !is_nacl && target_cpu != "x86" &&
+        (use_gold || use_lld)) {
+      if (is_clang) {
+        # This flag enables the GNU-format pubnames and pubtypes sections,
+        # which lld needs in order to generate a correct GDB index.
+        # TODO(pcc): Try to make lld understand non-GNU-format pubnames
+        # sections (llvm.org/PR34820).
+        cflags += [ "-ggnu-pubnames" ]
+      }
+      ldflags += [ "-Wl,--gdb-index" ]
+    }
+  }
+
+  if (is_clang && !is_nacl && !use_xcode_clang) {
+    if (is_apple) {
+      # TODO(https://crbug.com/1050118): Investigate missing debug info on mac.
+      # Make sure we don't use constructor homing on mac.
+      cflags += [
+        "-Xclang",
+        "-debug-info-kind=limited",
+      ]
+    } else {
+      # Use constructor homing for debug info. This option reduces debug info
+      # by emitting class type info only when constructors are emitted.
+      cflags += [
+        "-Xclang",
+        "-fuse-ctor-homing",
+      ]
+    }
+  }
+  rustflags = [ "-g" ]
+}
+
+# Minimal symbols.
+# This config guarantees to hold symbol for stack trace which are shown to user
+# when crash happens in unittests running on buildbot.
+config("minimal_symbols") {
+  if (is_win) {
+    # Functions, files, and line tables only.
+    cflags = []
+
+    if (is_clang && use_lld && use_ghash) {
+      cflags += [ "-gcodeview-ghash" ]
+      ldflags = [ "/DEBUG:GHASH" ]
+    } else {
+      ldflags = [ "/DEBUG" ]
+    }
+
+    # All configs using /DEBUG should include this:
+    configs = [ ":win_pdbaltpath" ]
+
+    # Enable line tables for clang. MSVC doesn't have an equivalent option.
+    if (is_clang) {
+      # -gline-tables-only is the same as -g1, but clang-cl only exposes the
+      # former.
+      cflags += [ "-gline-tables-only" ]
+    }
+  } else {
+    cflags = []
+    if (is_mac && !use_dwarf5) {
+      # clang defaults to DWARF2 on macOS unless mac_deployment_target is
+      # at least 10.11.
+      # TODO(thakis): Remove this once mac_deployment_target is 10.11.
+      cflags += [ "-gdwarf-4" ]
+    }
+
+    if (use_dwarf5 && !is_nacl) {
+      cflags += [ "-gdwarf-5" ]
+    }
+
+    # The gcc-based nacl compilers don't support -fdebug-compilation-dir (see
+    # elsewhere in this file), so they can't have build-dir-independent output.
+    # Disable symbols for nacl object files to get deterministic,
+    # build-directory-independent output. pnacl and nacl-clang do support that
+    # flag, so we can use use -g1 for pnacl and nacl-clang compiles.
+    # gcc nacl is is_nacl && !is_clang, pnacl and nacl-clang are && is_clang.
+    if (!is_nacl || is_clang) {
+      cflags += [ "-g1" ]
+    }
+
+    if (!is_nacl && is_clang && !is_tsan && !is_asan) {
+      # See comment for -gdwarf-aranges in config("symbols").
+      cflags += [ "-gdwarf-aranges" ]
+    }
+
+    ldflags = []
+    if (is_android && is_clang) {
+      # Android defaults to symbol_level=1 builds in production builds
+      # (https://crbug.com/648948), but clang, unlike gcc, doesn't emit
+      # DW_AT_linkage_name in -g1 builds. -fdebug-info-for-profiling enables
+      # that (and a bunch of other things we don't need), so that we get
+      # qualified names in stacks.
+      # TODO(thakis): Consider making clang emit DW_AT_linkage_name in -g1 mode;
+      #               failing that consider doing this on non-Android too.
+      cflags += [ "-fdebug-info-for-profiling" ]
+    }
+
+    # Note: debug_fission is no-op with symbol_level=1 since all -g1 debug_info
+    # will stay in the executable.
+
+    asmflags = cflags
+  }
+  rustflags = [ "-Cdebuginfo=1" ]
+}
+
+# This configuration contains function names only. That is, the compiler is
+# told to not generate debug information and the linker then just puts function
+# names in the final debug information.
+config("no_symbols") {
+  if (is_win) {
+    ldflags = [ "/DEBUG" ]
+
+    # All configs using /DEBUG should include this:
+    configs = [ ":win_pdbaltpath" ]
+  } else {
+    cflags = [ "-g0" ]
+    asmflags = cflags
+  }
+}
+
+# Default symbols.
+config("default_symbols") {
+  if (symbol_level == 0) {
+    configs = [ ":no_symbols" ]
+  } else if (symbol_level == 1) {
+    configs = [ ":minimal_symbols" ]
+  } else if (symbol_level == 2) {
+    configs = [ ":symbols" ]
+  } else {
+    assert(false)
+  }
+
+  # This config is removed by base unittests apk.
+  if (is_android && is_clang && strip_debug_info) {
+    configs += [ ":strip_debug" ]
+  }
+}
+
+config("strip_debug") {
+  if (!defined(ldflags)) {
+    ldflags = []
+  }
+  ldflags += [ "-Wl,--strip-debug" ]
+}
+
+if (is_apple) {
+  # On Mac and iOS, this enables support for ARC (automatic ref-counting).
+  # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html.
+  config("enable_arc") {
+    common_flags = [ "-fobjc-arc" ]
+    cflags_objc = common_flags
+    cflags_objcc = common_flags
+  }
+}
+
+if (is_chromeos_ash && is_chromeos_device) {
+  # This config is intended to be a temporary to facilitate
+  # the transition to use orderfile in Chrome OS. Once orderfile
+  # use becomes a default in Chrome OS, this config should not
+  # be needed.
+  config("use_orderfile_for_hugepage") {
+    if (chrome_orderfile_path != "") {
+      defines = [ "CHROMEOS_ORDERFILE_USE" ]
+    }
+  }
+}
+
+if (is_android || (is_chromeos_ash && is_chromeos_device)) {
+  # Use orderfile for linking Chrome on Android and Chrome OS.
+  # This config enables using an orderfile for linking in LLD.
+  # TODO: Consider using call graph sort instead, at least on Android.
+  config("chrome_orderfile_config") {
+    if (chrome_orderfile_path != "" && !enable_call_graph_profile_sort) {
+      assert(use_lld)
+      _rebased_orderfile = rebase_path(chrome_orderfile_path, root_build_dir)
+      ldflags = [
+        "-Wl,--symbol-ordering-file",
+        "-Wl,$_rebased_orderfile",
+        "-Wl,--no-warn-symbol-ordering",
+      ]
+      inputs = [ chrome_orderfile_path ]
+    }
+  }
+}
+
+# Initialize all variables on the stack if needed.
+config("default_init_stack_vars") {
+  cflags = []
+  if (init_stack_vars && is_clang && !is_nacl && !using_sanitizer) {
+    cflags += [ "-ftrivial-auto-var-init=pattern" ]
+  }
+}
+
+buildflag_header("compiler_buildflags") {
+  header = "compiler_buildflags.h"
+
+  flags = [
+    "CLANG_PGO=$chrome_pgo_phase",
+    "SYMBOL_LEVEL=$symbol_level",
+  ]
+}
+
+config("cet_shadow_stack") {
+  if (enable_cet_shadow_stack && is_win) {
+    assert(target_cpu == "x64")
+    ldflags = [ "/CETCOMPAT" ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/compiler/compiler.gni b/third_party/libwebrtc/build/config/compiler/compiler.gni
new file mode 100644
index 0000000000..55ae571ab7
--- /dev/null
+++ b/third_party/libwebrtc/build/config/compiler/compiler.gni
@@ -0,0 +1,324 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chrome_build.gni")
+import("//build/config/chromecast_build.gni")
+import("//build/config/chromeos/args.gni")
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/config/compiler/pgo/pgo.gni")
+import("//build/config/sanitizers/sanitizers.gni")
+import("//build/toolchain/cc_wrapper.gni")
+import("//build/toolchain/goma.gni")
+import("//build/toolchain/toolchain.gni")
+import("//build_overrides/build.gni")
+
+if (is_android) {
+  import("//build/config/android/abi.gni")
+}
+if (target_cpu == "arm" || target_cpu == "arm64") {
+  import("//build/config/arm.gni")
+}
+
+if (is_apple) {
+  import("//build/config/apple/symbols.gni")
+}
+
+if (is_ios) {
+  import("//build/config/ios/config.gni")
+}
+
+declare_args() {
+  # Default to warnings as errors for default workflow, where we catch
+  # warnings with known toolchains. Allow overriding this e.g. for Chromium
+  # builds on Linux that could use a different version of the compiler.
+  # With GCC, warnings in no-Chromium code are always not treated as errors.
+  treat_warnings_as_errors = true
+
+  # How many symbols to include in the build. This affects the performance of
+  # the build since the symbols are large and dealing with them is slow.
+  #   2 means regular build with symbols.
+  #   1 means minimal symbols, usually enough for backtraces only. Symbols with
+  # internal linkage (static functions or those in anonymous namespaces) may not
+  # appear when using this level.
+  #   0 means no symbols.
+  #   -1 means auto-set according to debug/release and platform.
+  symbol_level = -1
+
+  # Android-only: Strip the debug info of libraries within lib.unstripped to
+  # reduce size. As long as symbol_level > 0, this will still allow stacks to be
+  # symbolized.
+  strip_debug_info = false
+
+  # Compile in such a way as to enable profiling of the generated code. For
+  # example, don't omit the frame pointer and leave in symbols.
+  enable_profiling = false
+
+  # use_debug_fission: whether to use split DWARF debug info
+  # files. This can reduce link time significantly, but is incompatible
+  # with some utilities such as icecc and ccache. Requires gold and
+  # gcc >= 4.8 or clang.
+  # http://gcc.gnu.org/wiki/DebugFission
+  #
+  # This is a placeholder value indicating that the code below should set
+  # the default.  This is necessary to delay the evaluation of the default
+  # value expression until after its input values such as use_gold have
+  # been set, e.g. by a toolchain_args() block.
+  use_debug_fission = "default"
+
+  # Enables support for ThinLTO, which links 3x-10x faster than full LTO. See
+  # also http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html
+  # Use it by default on official-optimized android and Chrome OS builds, but
+  # not ARC or linux-chromeos since it's been seen to not play nicely with
+  # Chrome's clang. crbug.com/1033839
+  use_thin_lto =
+      is_cfi ||
+      (is_official_build && chrome_pgo_phase != 1 &&
+       (is_linux || is_win || (is_android && target_os != "chromeos") ||
+        ((is_chromeos_ash || is_chromeos_lacros) && is_chromeos_device)))
+
+  # If true, use Goma for ThinLTO code generation where applicable.
+  use_goma_thin_lto = false
+
+  # Whether we're using a sample profile collected on an architecture different
+  # than the one we're compiling for.
+  #
+  # It's currently not possible to collect AFDO profiles on anything but
+  # x86{,_64}.
+  using_mismatched_sample_profile = target_cpu != "x64" && target_cpu != "x86"
+
+  # Whether an error should be raised on attempts to make debug builds with
+  # is_component_build=false. Very large debug symbols can have unwanted side
+  # effects so this is enforced by default for chromium.
+  forbid_non_component_debug_builds = build_with_chromium
+
+  # Exclude unwind tables by default for official builds as unwinding can be
+  # done from stack dumps produced by Crashpad at a later time "offline" in the
+  # crash server. Since this increases binary size, we don't recommend including
+  # them in shipping builds.
+  # For unofficial (e.g. development) builds and non-Chrome branded (e.g. Cronet
+  # which doesn't use Crashpad, crbug.com/479283) builds it's useful to be able
+  # to unwind at runtime.
+  # Include the unwind tables on Android even for official builds, as otherwise
+  # the crash dumps generated by Android's debuggerd are largely useless, and
+  # having this additional mechanism to understand issues is particularly helpful
+  # to WebView.
+  exclude_unwind_tables = is_official_build && !is_android
+
+  # Where to redirect clang crash diagnoses
+  clang_diagnostic_dir =
+      rebase_path("//tools/clang/crashreports", root_build_dir)
+
+  # Mark binaries as compatible with Shadow Stack of Control-flow Enforcement
+  # Technology (CET). If Windows version and hardware supports the feature and
+  # it's enabled by OS then additional validation of return address will be
+  # performed as mitigation against Return-oriented programming (ROP).
+  # https://chromium.googlesource.com/chromium/src/+/main/docs/design/sandbox.md#cet-shadow-stack
+  enable_cet_shadow_stack = target_cpu == "x64"
+}
+
+assert(!is_cfi || use_thin_lto, "CFI requires ThinLTO")
+
+# If true, optimize for size. Does not affect windows builds.
+# Linux & Mac favor speed over size.
+# TODO(brettw) it's weird that Mac and desktop Linux are different. We should
+# explore favoring size over speed in this case as well.
+optimize_for_size = is_android || is_chromecast || is_fuchsia || is_ios
+
+declare_args() {
+  # Whether we should consider the profile we're using to be accurate. Accurate
+  # profiles have the benefit of (potentially substantial) binary size
+  # reductions, by instructing the compiler to optimize cold and uncovered
+  # functions heavily for size. This often comes at the cost of performance.
+  sample_profile_is_accurate = optimize_for_size
+}
+
+# Determine whether to enable or disable frame pointers, based on the platform
+# and build arguments.
+# TODO(crbug.com/1052397): Consider changing is_chromeos_ash to is_chromeos after
+# lacros-chrome switches to target_os="chromeos".
+if (is_chromeos_ash || is_chromeos_lacros) {
+  # ChromeOS generally prefers frame pointers, to support CWP.
+  # However, Clang does not currently generate usable frame pointers in ARM
+  # 32-bit builds (https://bugs.llvm.org/show_bug.cgi?id=18505) so disable them
+  # there to avoid the unnecessary overhead.
+  enable_frame_pointers = target_cpu != "arm"
+} else if (is_apple || is_linux || is_chromeos) {
+  enable_frame_pointers = true
+} else if (is_win) {
+  # 64-bit Windows ABI doesn't support frame pointers.
+  if (target_cpu == "x64") {
+    enable_frame_pointers = false
+  } else {
+    enable_frame_pointers = true
+  }
+} else if (is_android) {
+  enable_frame_pointers =
+      enable_profiling ||
+      # Ensure that stacks from arm64 crash dumps are usable (crbug.com/391706).
+      target_cpu == "arm64" ||
+      # For x86 Android, unwind tables are huge without frame pointers
+      # (crbug.com/762629). Enabling frame pointers grows the code size slightly
+      # but overall shrinks binaries considerably by avoiding huge unwind
+      # tables.
+      (target_cpu == "x86" && !exclude_unwind_tables && optimize_for_size) ||
+      using_sanitizer ||
+      # For caller-callee instrumentation version which needs frame pointers to
+      # get the caller address.
+      use_call_graph
+} else {
+  # Explicitly ask for frame pointers, otherwise:
+  # * Stacks may be missing for sanitizer and profiling builds.
+  # * Debug tcmalloc can crash (crbug.com/636489).
+  enable_frame_pointers = using_sanitizer || enable_profiling || is_debug
+}
+
+# In general assume that if we have frame pointers then we can use them to
+# unwind the stack. However, this requires that they are enabled by default for
+# most translation units, that they are emitted correctly, and that the
+# compiler or platform provides a way to access them.
+can_unwind_with_frame_pointers = enable_frame_pointers
+if (target_cpu == "arm" && arm_use_thumb) {
+  # We cannot currently unwind ARM Thumb frame pointers correctly.
+  # See https://bugs.llvm.org/show_bug.cgi?id=18505
+  can_unwind_with_frame_pointers = false
+} else if (is_win) {
+  # Windows 32-bit does provide frame pointers, but the compiler does not
+  # provide intrinsics to access them, so we don't use them.
+  can_unwind_with_frame_pointers = false
+}
+
+assert(!can_unwind_with_frame_pointers || enable_frame_pointers)
+
+# Unwinding with CFI table is only possible on static library builds and
+# requried only when frame pointers are not enabled.
+can_unwind_with_cfi_table = is_android && !is_component_build &&
+                            !enable_frame_pointers && target_cpu == "arm"
+
+# Whether or not cfi table should be enabled on arm.
+# TODO(crbug.com/1090409): Replace can_unwind_with_cfi_table with this once
+# sampling profiler is enabled on android.
+enable_arm_cfi_table = is_android && !is_component_build && target_cpu == "arm"
+
+declare_args() {
+  # If this running on a GPU FYI bot.
+  # TODO(https://crbug.com/1233871): Remove this again.
+  is_gpu_fyi_bot = false
+}
+
+declare_args() {
+  # Set to true to use lld, the LLVM linker.
+  # In late bring-up on macOS (see docs/mac_lld.md).
+  # Tentatively used on iOS, except in cronet builds (cronet still supports 32-bit builds, which
+  # lld doesn't support).
+  # The default linker everywhere else.
+  use_lld =
+      is_clang && !(is_ios && is_cronet_build) && !(is_mac && is_gpu_fyi_bot)
+}
+
+declare_args() {
+  # Whether to use the gold linker from binutils instead of lld or bfd.
+  use_gold = !use_lld && !(is_chromecast && is_linux &&
+                           (target_cpu == "arm" || target_cpu == "mipsel")) &&
+             (((is_linux || is_chromeos_lacros) &&
+               (target_cpu == "x64" || target_cpu == "x86" ||
+                target_cpu == "arm" || target_cpu == "arm64" ||
+                target_cpu == "mipsel" || target_cpu == "mips64el")) ||
+              (is_android && (target_cpu == "x86" || target_cpu == "x64" ||
+                              target_cpu == "arm" || target_cpu == "arm64")))
+}
+
+# Use relative paths for debug info. This is important to make the build
+# results independent of the checkout and build directory names, which
+# in turn is important for goma compile hit rate.
+# Setting this to true may make it harder to debug binaries on Linux, see
+# https://chromium.googlesource.com/chromium/src/+/main/docs/linux/debugging.md#Source-level-debug-with-fdebug_compilation_dir
+# It's not clear if the crash server will correctly handle dSYMs with relative
+# paths, so we disable this feature for official benefit. The main benefit is
+# deterministic builds to reduce compile times, so this is less relevant for
+# official builders.
+strip_absolute_paths_from_debug_symbols_default =
+    is_android || is_fuchsia || is_nacl || (is_win && use_lld) || is_linux ||
+    is_chromeos || (is_apple && !enable_dsyms)
+
+# If the platform uses stripped absolute paths by default, then we don't expose
+# it as a configuration option. If this is causing problems, please file a bug.
+if (strip_absolute_paths_from_debug_symbols_default) {
+  strip_absolute_paths_from_debug_symbols = true
+} else {
+  declare_args() {
+    strip_absolute_paths_from_debug_symbols = false
+  }
+}
+
+# If it wasn't manually set, then default use_debug_fission to false.
+assert(
+    use_debug_fission == "default" || use_debug_fission || !use_debug_fission,
+    "Invalid use_debug_fission.")
+if (use_debug_fission == "default") {
+  use_debug_fission = is_debug && !is_android && !is_fuchsia && !is_apple &&
+                      !is_win && (use_gold || use_lld) && cc_wrapper == ""
+}
+
+# If it wasn't manually set, set to an appropriate default.
+assert(symbol_level >= -1 && symbol_level <= 2, "Invalid symbol_level")
+if (symbol_level == -1) {
+  if (is_android && !is_component_build && !use_debug_fission) {
+    # Reduce symbol level when it will cause invalid elf files to be created
+    # (due to file size). https://crbug.com/648948.
+    symbol_level = 1
+  } else if (is_chromeos_device) {
+    # Use lower symbol level in Simple Chrome build for faster link time.
+    # For Simple Chrome, this should take precedence over is_official_build,
+    # turned on by --internal.
+    if ((target_cpu == "x64" || target_cpu == "x86") && !is_debug) {
+      # For release x86/x64 build, specify symbol_level=0 for faster link time.
+      # x86/x64 shows backtraces with symbol_level=0 (arm requires
+      # symbol_level=1).
+      symbol_level = 0
+    } else {
+      symbol_level = 1
+    }
+  } else if (using_sanitizer) {
+    # Sanitizers need line table info for stack traces. They don't need type
+    # info or variable info, so we can leave that out to speed up the build.
+    # Sanitizers also require symbols for filename suppressions to work.
+    symbol_level = 1
+  } else if ((!is_nacl && !is_linux && !is_chromeos && !is_fuchsia &&
+              current_os != "aix") || is_debug || is_official_build ||
+             is_chromecast) {
+    # Linux builds slower by having symbols as part of the target binary,
+    # whereas Mac and Windows have them separate, so in Release Linux, default
+    # them off, but keep them on for Official builds and Chromecast builds.
+    symbol_level = 2
+  } else {
+    symbol_level = 0
+  }
+}
+
+# Split dwarf works only for symbol_level == 2.
+use_debug_fission = use_debug_fission && symbol_level == 2
+
+# Non-component debug builds with symbol_level = 2 are an undesirable (very slow
+# build times) and unsupported (some test binaries will fail with > 4 GB PDBs)
+# combination. This is only checked when current_toolchain == default_toolchain
+# because the is_component_build flag is set to false in various components of
+# the build (like nacl) and we don't want to assert on those.
+# iOS does not support component builds so add an exception for this platform.
+if (forbid_non_component_debug_builds) {
+  assert(symbol_level != 2 || current_toolchain != default_toolchain ||
+             is_component_build || !is_debug || is_ios,
+         "Can't do non-component debug builds at symbol_level=2")
+}
+
+# Assert that the configuration isn't going to hit https://crbug.com/648948.
+# An exception is made when target_os == "chromeos" as we only use the Android
+# toolchain there to build relatively small binaries.
+assert(
+    ignore_elf32_limitations || !is_android || target_os == "chromeos" ||
+        is_component_build || symbol_level < 2 || use_debug_fission ||
+        (android_64bit_target_cpu && skip_secondary_abi_for_cq),
+    "Android 32-bit non-component builds without DWARF Fission cannot " +
+        "have symbol_level=2 due to 4GiB file size limit, see " +
+        "https://crbug.com/648948. " + "If you really want to try this out, " +
+        "set ignore_elf32_limitations=true.")
diff --git a/third_party/libwebrtc/build/config/compiler/pgo/BUILD.gn b/third_party/libwebrtc/build/config/compiler/pgo/BUILD.gn
new file mode 100644
index 0000000000..3e8502ed77
--- /dev/null
+++ b/third_party/libwebrtc/build/config/compiler/pgo/BUILD.gn
@@ -0,0 +1,100 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/config/clang/clang.gni")
+import("//build/config/compiler/compiler.gni")
+import("//build/config/compiler/pgo/pgo.gni")
+import("//build/toolchain/toolchain.gni")
+
+# Configuration that enables PGO instrumentation.
+config("pgo_instrumentation_flags") {
+  visibility = [ ":default_pgo_flags" ]
+
+  # Only add flags when chrome_pgo_phase == 1, so that variables we would use
+  # are not required to be defined when we're not actually using PGO.
+  if (chrome_pgo_phase == 1 && is_clang && !is_nacl && is_a_target_toolchain) {
+    cflags = [ "-fprofile-generate" ]
+    if (!is_win) {
+      # Windows directly calls link.exe instead of the compiler driver when
+      # linking, and embeds the path to the profile runtime library as
+      # dependent library into each object file.
+      ldflags = [ "-fprofile-generate" ]
+    }
+  }
+}
+
+# Configuration that enables optimization using profile data.
+config("pgo_optimization_flags") {
+  visibility = [ ":default_pgo_flags" ]
+
+  # Only add flags when chrome_pgo_phase == 2, so that variables we would use
+  # are not required to be defined when we're not actually using PGO.
+  if (chrome_pgo_phase == 2 && is_clang && !is_nacl && is_a_target_toolchain) {
+    _pgo_target = ""
+
+    # There are txt files used by //tools/update_pgo_profiles.py to decide which
+    # profiles to use, adding them as inputs so that analyzer recognizes the
+    # dependencies.
+    inputs = []
+
+    if (is_win) {
+      if (target_cpu == "x64") {
+        _pgo_target = "win64"
+        inputs = [ "//chrome/build/win64.pgo.txt" ]
+      } else {
+        _pgo_target = "win32"
+        inputs = [ "//chrome/build/win32.pgo.txt" ]
+      }
+    } else if (is_mac) {
+      _pgo_target = "mac"
+      inputs = [ "//chrome/build/mac.pgo.txt" ]
+    } else if (is_linux || is_chromeos_lacros) {
+      _pgo_target = "linux"
+      inputs = [ "//chrome/build/linux.pgo.txt" ]
+    }
+
+    if (pgo_data_path == "" && _pgo_target != "") {
+      pgo_data_path = rebase_path(exec_script("//tools/update_pgo_profiles.py",
+                                              [
+                                                "--target",
+                                                _pgo_target,
+                                                "get_profile_path",
+                                              ],
+                                              "value"),
+                                  root_build_dir)
+    }
+    assert(pgo_data_path != "",
+           "Please set pgo_data_path to point at the profile data")
+    cflags = [
+      "-fprofile-instr-use=$pgo_data_path",
+
+      # It's possible to have some profile data legitimately missing,
+      # and at least some profile data always ends up being considered
+      # out of date, so make sure we don't error for those cases.
+      "-Wno-profile-instr-unprofiled",
+      "-Wno-profile-instr-out-of-date",
+
+      # Some hashing conflict results in a lot of warning like this when doing
+      # a PGO build:
+      #   warning: foo.cc: Function control flow change detected (hash mismatch)
+      #   [-Wbackend-plugin]
+      # See https://crbug.com/978401
+      "-Wno-backend-plugin",
+    ]
+  }
+}
+
+# Applies flags necessary when profile-guided optimization is used.
+# Flags are only added if PGO is enabled, so that this config is safe to
+# include by default.
+config("default_pgo_flags") {
+  if (chrome_pgo_phase == 0) {
+    # Nothing. This config should be a no-op when chrome_pgo_phase == 0.
+  } else if (chrome_pgo_phase == 1) {
+    configs = [ ":pgo_instrumentation_flags" ]
+  } else if (chrome_pgo_phase == 2) {
+    configs = [ ":pgo_optimization_flags" ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/compiler/pgo/pgo.gni b/third_party/libwebrtc/build/config/compiler/pgo/pgo.gni
new file mode 100644
index 0000000000..c053eb530b
--- /dev/null
+++ b/third_party/libwebrtc/build/config/compiler/pgo/pgo.gni
@@ -0,0 +1,25 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chromecast_build.gni")
+import("//build/config/chromeos/ui_mode.gni")
+
+declare_args() {
+  # Specify the current PGO phase.
+  # Here's the different values that can be used:
+  #     0 : Means that PGO is turned off.
+  #     1 : Used during the PGI (instrumentation) phase.
+  #     2 : Used during the PGO (optimization) phase.
+  chrome_pgo_phase = 0
+  if (is_official_build &&
+      # TODO(crbug.com/1052397): Remove chromeos_is_browser_only once
+      # target_os switch for lacros-chrome is completed.
+      (is_win || is_mac ||
+       (is_linux && !chromeos_is_browser_only && !is_chromecast))) {
+    chrome_pgo_phase = 2
+  }
+
+  # When using chrome_pgo_phase = 2, read profile data from this path.
+  pgo_data_path = ""
+}
diff --git a/third_party/libwebrtc/build/config/compute_inputs_for_analyze.gni b/third_party/libwebrtc/build/config/compute_inputs_for_analyze.gni
new file mode 100644
index 0000000000..050ab70a3f
--- /dev/null
+++ b/third_party/libwebrtc/build/config/compute_inputs_for_analyze.gni
@@ -0,0 +1,14 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  # Enable this flag when running "gn analyze".
+  #
+  # This causes some gn actions to compute inputs immediately (via exec_script)
+  # where they would normally compute them only when executed (and write them to
+  # a depfile).
+  #
+  # This flag will slow down GN, but is required for analyze to work properly.
+  compute_inputs_for_analyze = false
+}
diff --git a/third_party/libwebrtc/build/config/coverage/BUILD.gn b/third_party/libwebrtc/build/config/coverage/BUILD.gn
new file mode 100644
index 0000000000..09c227dce8
--- /dev/null
+++ b/third_party/libwebrtc/build/config/coverage/BUILD.gn
@@ -0,0 +1,34 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/coverage/coverage.gni")
+
+config("default_coverage") {
+  if (use_clang_coverage) {
+    ldflags = []
+    if (!is_win) {
+      # Windows directly calls link.exe instead of the compiler driver when
+      # linking, and embeds the path to the profile runtime library as
+      # dependent library into each object file.
+      ldflags += [ "-fprofile-instr-generate" ]
+    }
+
+    cflags = [
+      "-fprofile-instr-generate",
+      "-fcoverage-mapping",
+
+      # Following experimental flags removes unused header functions from the
+      # coverage mapping data embedded in the test binaries, and the reduction
+      # of binary size enables building Chrome's large unit test targets on
+      # MacOS. Please refer to crbug.com/796290 for more details.
+      "-mllvm",
+      "-limited-coverage-experimental=true",
+    ]
+
+    if (is_linux || is_chromeos) {
+      # TODO(crbug.com/1194301): Remove this flag.
+      cflags += [ "-fno-use-cxa-atexit" ]
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/coverage/OWNERS b/third_party/libwebrtc/build/config/coverage/OWNERS
new file mode 100644
index 0000000000..0fc481f477
--- /dev/null
+++ b/third_party/libwebrtc/build/config/coverage/OWNERS
@@ -0,0 +1,3 @@
+inferno@chromium.org
+liaoyuke@chromium.org
+ochang@chromium.org
diff --git a/third_party/libwebrtc/build/config/coverage/coverage.gni b/third_party/libwebrtc/build/config/coverage/coverage.gni
new file mode 100644
index 0000000000..b0e01c1d4e
--- /dev/null
+++ b/third_party/libwebrtc/build/config/coverage/coverage.gni
@@ -0,0 +1,40 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/toolchain/toolchain.gni")
+if (is_fuchsia) {
+  import("//third_party/fuchsia-sdk/sdk/build/component.gni")
+}
+
+# There are two ways to enable code coverage instrumentation:
+# 1. When |use_clang_coverage| or |use_jacoco_coverage| is true and
+#    |coverage_instrumentation_input_file| is empty, all source files or
+#    Java class files are instrumented.
+# 2. When |use_clang_coverage| or |use_jacoco_coverage| is true and
+#    |coverage_instrumentation_input_file| is NOT empty and points to
+#    a text file on the file system, ONLY source files specified in the
+#    input file or Java class files related to source files are instrumented.
+declare_args() {
+  # Enable Clang's Source-based Code Coverage.
+  if (is_fuchsia) {
+    use_clang_coverage = fuchsia_code_coverage
+  } else {
+    use_clang_coverage = false
+  }
+
+  # Enables JaCoCo Java code coverage.
+  use_jacoco_coverage = false
+
+  # The path to the coverage instrumentation input file should be a source root
+  # absolute path (e.g. //out/Release/coverage_instrumentation_input.txt), and
+  # the file consists of multiple lines where each line represents a path to a
+  # source file, and the paths must be relative to the root build directory.
+  # e.g. ../../base/task/post_task.cc for build directory 'out/Release'.
+  #
+  # NOTE that this arg will be non-op if use_clang_coverage is false.
+  coverage_instrumentation_input_file = ""
+}
+
+assert(!use_clang_coverage || is_clang,
+       "Clang Source-based Code Coverage requires clang.")
diff --git a/third_party/libwebrtc/build/config/crypto.gni b/third_party/libwebrtc/build/config/crypto.gni
new file mode 100644
index 0000000000..4d2c01128d
--- /dev/null
+++ b/third_party/libwebrtc/build/config/crypto.gni
@@ -0,0 +1,15 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This file declares build flags for the SSL library configuration.
+#
+# TODO(brettw) this should probably be moved to src/crypto or somewhere, and
+# the global build dependency on it should be removed.
+#
+# PLEASE TRY TO AVOID ADDING FLAGS TO THIS FILE in cases where grit isn't
+# required. See the declare_args block of BUILDCONFIG.gn for advice on how
+# to set up feature flags.
+
+# True if NSS is used for certificate handling.
+use_nss_certs = is_linux || is_chromeos
diff --git a/third_party/libwebrtc/build/config/dcheck_always_on.gni b/third_party/libwebrtc/build/config/dcheck_always_on.gni
new file mode 100644
index 0000000000..0e8443f907
--- /dev/null
+++ b/third_party/libwebrtc/build/config/dcheck_always_on.gni
@@ -0,0 +1,40 @@
+# Copyright (c) 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# TODO(crbug.com/1233050): Until the bug is resolved we need to include
+# gclient_args for the definition of build_with_chromium and build_overrides
+# for client overrides of that flag. The latter should go away.
+import("//build/config/gclient_args.gni")
+import("//build_overrides/build.gni")
+declare_args() {
+  # Enables DCHECKs to be built-in, but to default to being non-fatal/log-only.
+  # DCHECKS can then be set as fatal/non-fatal via the DCheckIsFatal feature.
+  # See https://bit.ly/dcheck-albatross for details on how this is used.
+  dcheck_is_configurable = false
+}
+
+declare_args() {
+  # Set to false to disable DCHECK in Release builds. This is enabled by default
+  # for non-official builds on the below platforms.
+  # This default only affects Chromium as indicated by build_with_chromium.
+  # Other clients typically set this to false. If another client wants to use
+  # the same default value as Chromium, we'd need to add a separate gclient
+  # variable to replace build_with_chromium here.
+  # Note: If you are here to revert because DCHECKs are failing on a specific OS
+  # please prefer excluding OSes rather than reverting . I.e. if Mac builds
+  # break badly but other platforms are reasonably stable, add "&& !is_mac"
+  # instead of reverting.
+  dcheck_always_on =
+      (build_with_chromium && !is_official_build) || dcheck_is_configurable
+}
+
+declare_args() {
+  # Set to false to disable EXPENSIVE_DCHECK()s.
+  # TODO(crbug.com/1225701): Hash out whether expensive DCHECKs need to be
+  # disabled for developers by default. There's concern that disabling these
+  # globally by default effectively reduces them to zero coverage. This is
+  # in place so that you can disable expensive DCHECKs while retaining some
+  # DCHECK coverage, which is especially important in user-facing builds.
+  enable_expensive_dchecks = is_debug || dcheck_always_on
+}
diff --git a/third_party/libwebrtc/build/config/devtools.gni b/third_party/libwebrtc/build/config/devtools.gni
new file mode 100644
index 0000000000..7a6d2b2f06
--- /dev/null
+++ b/third_party/libwebrtc/build/config/devtools.gni
@@ -0,0 +1,37 @@
+# Copyright (c) 2021 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chrome_build.gni")
+import("//build_overrides/build.gni")
+
+declare_args() {
+  if (build_with_chromium) {
+    # devtools_location is used in DevTools to resolve to the correct location
+    # for any script/file referenced in the DevTools build scripts. Since
+    # DevTools supports both a standalone build and build integration with
+    # Chromium, we need to differentiate between the two versions.
+    # devtools_location points to the Chromium version in both Chrome-branded
+    # and not Chrome-branded builds. devtools_root_location points to the root
+    # of the Chrome-branded version when is_chrome_branded is true and to the root
+    # of the Chromium version when is_chrome_branded is false.
+    # devtools_grd_location is the location of the GRD file listing all DevTools
+    # resources.
+    if (is_chrome_branded) {
+      devtools_root_location = "third_party/devtools-frontend-internal"
+      devtools_location = "$devtools_root_location/devtools-frontend/"
+      devtools_grd_location =
+          "$devtools_root_location/chrome_devtools_resources.grd"
+    } else {
+      devtools_root_location = "third_party/devtools-frontend/src"
+      devtools_location = "third_party/devtools-frontend/src/"
+      devtools_grd_location =
+          "$devtools_root_location/front_end/devtools_resources.grd"
+    }
+  } else {
+    # DevTools is building a standalone version
+    devtools_location = ""
+    devtools_root_location = ""
+    devtools_grd_location = ""
+  }
+}
diff --git a/third_party/libwebrtc/build/config/features.gni b/third_party/libwebrtc/build/config/features.gni
new file mode 100644
index 0000000000..62bf4bcb35
--- /dev/null
+++ b/third_party/libwebrtc/build/config/features.gni
@@ -0,0 +1,40 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# =============================================
+#   PLEASE DO NOT ADD MORE FLAGS TO THIS FILE
+# =============================================
+#
+# These flags are effectively global. Your feature flag should go near the
+# code it controls. Most of these items are here now because they control
+# legacy global #defines passed to the compiler (now replaced with generated
+# buildflag headers -- see //build/buildflag_header.gni).
+#
+# There is more advice on where to put build flags in the "Build flag" section
+# of //build/config/BUILDCONFIG.gn.
+
+import("//build/config/chrome_build.gni")
+import("//build/config/chromecast_build.gni")
+
+declare_args() {
+  # Enables proprietary codecs and demuxers; e.g. H264, AAC, MP3, and MP4.
+  # We always build Google Chrome and Chromecast with proprietary codecs.
+  #
+  # Note: this flag is used by WebRTC which is DEPSed into Chrome. Moving it
+  # out of //build will require using the build_overrides directory.
+  proprietary_codecs = is_chrome_branded || is_chromecast
+
+  # libudev usage. This currently only affects the content layer.
+  use_udev = (is_linux || is_chromeos) && !is_chromecast
+
+  use_dbus = (is_linux || is_chromeos) && !is_chromecast
+
+  use_gio = is_linux && !is_chromecast
+}
+#
+# =============================================
+#   PLEASE DO NOT ADD MORE FLAGS TO THIS FILE
+# =============================================
+#
+# See comment at the top.
diff --git a/third_party/libwebrtc/build/config/freetype/BUILD.gn b/third_party/libwebrtc/build/config/freetype/BUILD.gn
new file mode 100644
index 0000000000..76cb025fbb
--- /dev/null
+++ b/third_party/libwebrtc/build/config/freetype/BUILD.gn
@@ -0,0 +1,14 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/features.gni")
+import("//build/config/freetype/freetype.gni")
+
+group("freetype") {
+  if (use_system_freetype) {
+    public_configs = [ "//build/linux:freetype_from_pkgconfig" ]
+  } else {
+    public_deps = [ "//third_party:freetype_harfbuzz" ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/freetype/OWNERS b/third_party/libwebrtc/build/config/freetype/OWNERS
new file mode 100644
index 0000000000..3277f87312
--- /dev/null
+++ b/third_party/libwebrtc/build/config/freetype/OWNERS
@@ -0,0 +1,2 @@
+bungeman@chromium.org
+drott@chromium.org
diff --git a/third_party/libwebrtc/build/config/freetype/freetype.gni b/third_party/libwebrtc/build/config/freetype/freetype.gni
new file mode 100644
index 0000000000..b4eced2d65
--- /dev/null
+++ b/third_party/libwebrtc/build/config/freetype/freetype.gni
@@ -0,0 +1,14 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  # Blink needs a recent and properly build-configured FreeType version to
+  # support OpenType variations, color emoji and avoid security bugs. By default
+  # we ship and link such a version as part of Chrome. For distributions that
+  # prefer to keep linking to the version the system, FreeType must be newer
+  # than version 2.7.1 and have color bitmap support compiled in. WARNING:
+  # System FreeType configurations other than as described WILL INTRODUCE TEXT
+  # RENDERING AND SECURITY REGRESSIONS.
+  use_system_freetype = false
+}
diff --git a/third_party/libwebrtc/build/config/fuchsia/BUILD.gn b/third_party/libwebrtc/build/config/fuchsia/BUILD.gn
new file mode 100644
index 0000000000..88922a11e8
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/BUILD.gn
@@ -0,0 +1,30 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chromecast_build.gni")
+
+assert(is_fuchsia)
+assert(!is_posix)
+
+config("compiler") {
+  configs = [ "//third_party/fuchsia-sdk/sdk/build/config:compiler" ]
+
+  # TODO(https://crbug.com/706592): The stack defaults to 256k on Fuchsia (see
+  # https://fuchsia.googlesource.com/zircon/+/master/system/private/zircon/stack.h#9),
+  # but on other platforms it's much higher, so a variety of code assumes more
+  # will be available. Raise to 8M which matches e.g. macOS.
+  ldflags = [ "-Wl,-z,stack-size=0x800000" ]
+
+  # Allow this in chromium-only builds, but do not allow this in Chromecast
+  # builds.
+  if (!is_chromecast) {
+    cflags_cc = [ "-fexperimental-relative-c++-abi-vtables" ]
+    ldflags += [ "-fexperimental-relative-c++-abi-vtables" ]
+  }
+}
+
+# Settings for executables.
+config("executable_config") {
+  ldflags = [ "-pie" ]
+}
diff --git a/third_party/libwebrtc/build/config/fuchsia/DIR_METADATA b/third_party/libwebrtc/build/config/fuchsia/DIR_METADATA
new file mode 100644
index 0000000000..6d8f079aa5
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/DIR_METADATA
@@ -0,0 +1,7 @@
+monorail {
+  component: "Fuchsia"
+}
+
+team_email: "cr-fuchsia@chromium.org"
+
+os: FUCHSIA
diff --git a/third_party/libwebrtc/build/config/fuchsia/OWNERS b/third_party/libwebrtc/build/config/fuchsia/OWNERS
new file mode 100644
index 0000000000..3a1056b296
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/OWNERS
@@ -0,0 +1,4 @@
+file://build/fuchsia/OWNERS
+
+per-file *.cmx=set noparent
+per-file *.cmx=file://fuchsia/SECURITY_OWNERS
diff --git a/third_party/libwebrtc/build/config/fuchsia/build_cmx_from_fragment.py b/third_party/libwebrtc/build/config/fuchsia/build_cmx_from_fragment.py
new file mode 100644
index 0000000000..ac7e34988d
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/build_cmx_from_fragment.py
@@ -0,0 +1,49 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+"""Creates a complete CMX (v1) component manifest, from a program name and
+   manifest fragment file."""
+
+import argparse
+import json
+import sys
+
+
+def BuildCmxFromFragment(output_file, fragment_file, program_binary):
+  """Reads a CMX fragment specifying e.g. features & sandbox, and a program
+     binary's filename, and writes out the full CMX.
+
+     output_file: Build-relative filename at which to write the full CMX.
+     fragment_file: Build-relative filename of the CMX fragment to read from.
+     program_binary: Package-relative filename of the program binary.
+  """
+
+  with open(output_file, 'w') as component_manifest_file:
+    component_manifest = json.load(open(fragment_file, 'r'))
+    component_manifest.update({
+        'program': {
+            'binary': program_binary
+        },
+    })
+    json.dump(component_manifest, component_manifest_file)
+
+
+def main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument(
+      '--cmx-fragment',
+      required=True,
+      help='Path to the CMX fragment to read from')
+  parser.add_argument(
+      '--cmx', required=True, help='Path to write the complete CMX file to')
+  parser.add_argument(
+      '--program',
+      required=True,
+      help='Package-relative path to the program binary')
+  args = parser.parse_args()
+
+  return BuildCmxFromFragment(args.cmx, args.cmx_fragment, args.program)
+
+
+if __name__ == '__main__':
+  sys.exit(main())
diff --git a/third_party/libwebrtc/build/config/fuchsia/build_symbol_archive.py b/third_party/libwebrtc/build/config/fuchsia/build_symbol_archive.py
new file mode 100755
index 0000000000..c763627bf9
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/build_symbol_archive.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python
+#
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Creates a compressed archive of unstripped binaries cataloged by
+"ids.txt"."""
+
+import argparse
+import os
+import subprocess
+import sys
+import tarfile
+
+
+def main(args):
+  parser = argparse.ArgumentParser()
+  parser.add_argument('ids_txt', type=str, nargs=1,
+                      help='Path to ids.txt files.')
+  parser.add_argument('-o', '--output_tarball', nargs=1, type=str,
+                      help='Path which the tarball will be written to.')
+  parser.add_argument('--fuchsia-build-id-dir', type=str, required=True,
+                      help='Directory containing symbols for SDK prebuilts.')
+  args = parser.parse_args(args)
+
+  ids_txt = args.ids_txt[0]
+  build_ids_archive = tarfile.open(args.output_tarball[0], 'w:bz2')
+  for line in open(ids_txt, 'r'):
+    build_id, binary_path = line.strip().split(' ')
+
+    # Look for prebuilt symbols in the SDK first.
+    symbol_source_path = os.path.join(args.fuchsia_build_id_dir,
+                                      build_id[:2],
+                                      build_id[2:] + '.debug')
+    if not os.path.exists(symbol_source_path):
+      symbol_source_path = os.path.abspath(
+          os.path.join(os.path.dirname(ids_txt), binary_path))
+
+      if os.path.getsize(symbol_source_path) == 0:
+        # This is a prebuilt which wasn't accompanied by SDK symbols.
+        continue
+
+    # Exclude stripped binaries (indicated by their lack of symbol tables).
+    readelf_output = subprocess.check_output(
+        ['readelf', '-S', symbol_source_path], universal_newlines=True)
+    if not '.symtab' in readelf_output:
+      continue
+
+    # Archive the unstripped ELF binary, placing it in a hierarchy keyed to the
+    # GNU build ID. The binary resides in a directory whose name is the first
+    # two characters of the build ID, with the binary file itself named after
+    # the remaining characters of the build ID. So, a binary file with the build
+    # ID "deadbeef" would be located at the path 'de/adbeef.debug'.
+    build_ids_archive.add(symbol_source_path,
+                          '%s/%s.debug' % (build_id[:2], build_id[2:]))
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))
diff --git a/third_party/libwebrtc/build/config/fuchsia/config.gni b/third_party/libwebrtc/build/config/fuchsia/config.gni
new file mode 100644
index 0000000000..5a00cc5a85
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/config.gni
@@ -0,0 +1,11 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+assert(is_fuchsia)
+
+# Compute the AEMU path.
+aemu_root = "//third_party/aemu-${host_os}-${target_cpu}"
+
+# Compute the path to the arch-specific boot image directory.
+boot_image_root = "//third_party/fuchsia-sdk/images/${target_cpu}"
diff --git a/third_party/libwebrtc/build/config/fuchsia/extend_fvm.py b/third_party/libwebrtc/build/config/fuchsia/extend_fvm.py
new file mode 100644
index 0000000000..44e5ee30e1
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/extend_fvm.py
@@ -0,0 +1,26 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Copies a FVM file and extends it by a specified amount.
+
+Arg #1: path to 'fvm'.
+    #2: the path to the source fvm.blk.
+    #3: the path that the extended FVM file will be written to.
+    #4: the additional number of bytes to grow fvm.blk by."""
+
+import os
+import shutil
+import subprocess
+import sys
+
+def ExtendFVM(fvm_tool_path, src_path, dest_path, delta):
+  old_size = os.path.getsize(src_path)
+  new_size = old_size + int(delta)
+  shutil.copyfile(src_path, dest_path)
+  subprocess.check_call([fvm_tool_path, dest_path, 'extend', '--length',
+                         str(new_size)])
+  return 0
+
+if __name__ == '__main__':
+  sys.exit(ExtendFVM(*sys.argv[1:]))
diff --git a/third_party/libwebrtc/build/config/fuchsia/generate_runner_scripts.gni b/third_party/libwebrtc/build/config/fuchsia/generate_runner_scripts.gni
new file mode 100644
index 0000000000..3349b2b869
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/generate_runner_scripts.gni
@@ -0,0 +1,284 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+assert(is_fuchsia)
+
+import("//build/config/chromecast_build.gni")
+import("//build/config/fuchsia/config.gni")
+import("//build/config/fuchsia/package.gni")
+import("//build/config/gclient_args.gni")
+import("//build/config/sysroot.gni")
+import("//build/util/generate_wrapper.gni")
+
+declare_args() {
+  # Sets the Fuchsia Amber repository which will be used by default by the
+  # generated installation scripts. If not specified, then no default directory
+  # will be used.
+  default_fuchsia_build_dir_for_installation = ""
+
+  # Sets the Fuchsia device node name which will be used by default by the
+  # generated runner scripts. If not specficed, then no default node name will
+  # be used.
+  default_fuchsia_device_node_name = ""
+
+  # CPU architecture of the host used to run the tests.
+  test_host_cpu = host_cpu
+
+  # Sets whether emulators need to be included in the test isolates
+  test_isolate_uses_emulator = true
+
+  # A list of additional Fuchsia boot images to include in the test isolates.
+  fuchsia_additional_boot_images = []
+}
+
+# Generates a script which deploys and optionally executes a package on a
+# device.
+#
+# Parameters:
+#   package: The package() target which will be run.
+#   package_name_override: Specifies the name of the generated package, if its
+#       name is different than the |package| target name. This value must match
+#       package_name_override in the |package| target.
+#   package_deps: An array of [package, package_name_override] array pairs
+#       which specify additional dependency packages to be installed
+#       prior to execution.
+#   runner_script: The runner script implementation to use, relative to
+#       "build/fuchsia". Defaults to "test_runner.py".
+#   install_only: If true, executing the script will only install the package
+#       on the device, but not run it.
+#   is_test_exe: If true, the generated script will run the command under
+#       test_env.py and add arguments expected to be passed to test exes.
+template("fuchsia_package_runner") {
+  forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "runner_script" ])
+
+  if (defined(invoker.package_name_override)) {
+    _pkg_shortname = invoker.package_name_override
+  } else {
+    _pkg_shortname = get_label_info(invoker.package, "name")
+  }
+
+  _pkg_dir = "$root_out_dir/gen/" + get_label_info(invoker.package, "dir") +
+             "/" + _pkg_shortname
+  _package_path = "$_pkg_dir/${_pkg_shortname}.far"
+
+  generated_run_pkg_script_path = "$root_build_dir/bin/run_${_pkg_shortname}"
+  generated_install_pkg_script_path =
+      "$root_build_dir/bin/install_$_pkg_shortname"
+
+  _generate_runner_target = "${target_name}__generate_runner"
+  _generate_installer_target = "${target_name}__generate_installer"
+
+  # Generates a script which installs and runs a test.
+  generate_wrapper(_generate_runner_target) {
+    forward_variables_from(invoker, [ "target" ])
+
+    _is_test_exe = defined(invoker.is_test_exe) && invoker.is_test_exe
+
+    if (defined(runner_script)) {
+      _runner_script = runner_script
+    } else {
+      _runner_script = "//build/fuchsia/test_runner.py"
+    }
+
+    if (_is_test_exe) {
+      executable = "//testing/test_env.py"
+      executable_args =
+          [ "@WrappedPath(" + rebase_path(_runner_script, root_out_dir) + ")" ]
+      data = [
+        _runner_script,
+        "//.vpython",
+      ]
+      data_deps = [ "//testing:test_scripts_shared" ]
+    } else {
+      executable = rebase_path(_runner_script)
+      executable_args = []
+      data = []
+      data_deps = []
+    }
+
+    if (defined(invoker.data)) {
+      data += invoker.data
+    }
+
+    wrapper_script = generated_run_pkg_script_path
+
+    data_deps += [
+      invoker.package,
+
+      # Runner scripts require access to "ids.txt" for symbolization, and to
+      # the "package" from which to get the name & version to deploy, which
+      # are outputs of the archive manifest generation action.
+      "${invoker.package}__archive-manifest",
+
+      # Runner scripts require access to "meta.far" from which to calculate the
+      # expected Merkle root for the package, to verify it has been cached.
+      "${invoker.package}__archive-metadata",
+    ]
+    if (defined(invoker.data_deps)) {
+      data_deps += invoker.data_deps
+    }
+
+    # Declares the files that are needed for test execution on the
+    # swarming test client.
+    data += [
+      "//build/fuchsia/",
+      "//build/util/lib/",
+      "//third_party/fuchsia-sdk/sdk/.build-id/",
+      "//third_party/fuchsia-sdk/sdk/bin/fpave.sh",
+      "//third_party/fuchsia-sdk/sdk/bin/fuchsia-common.sh",
+      "//third_party/fuchsia-sdk/sdk/meta/manifest.json",
+    ]
+
+    # TODO(crbug.com/1137662): Remove checkout_fuchsia_for_arm64_host from
+    # gclient_gn_args in //DEPS as well as this condition when builders have
+    # test_host_cpu set correctly.
+    if (checkout_fuchsia_for_arm64_host) {
+      test_host_cpu = "arm64"
+    }
+
+    if (test_host_cpu == "x64") {
+      data_deps +=
+          [ "//build/config/clang:llvm-symbolizer_data($host_toolchain)" ]
+    }
+
+    data += [
+      "//third_party/fuchsia-sdk/sdk/tools/${test_host_cpu}/device-finder",
+      "//third_party/fuchsia-sdk/sdk/tools/${test_host_cpu}/ffx",
+      "//third_party/fuchsia-sdk/sdk/tools/${test_host_cpu}/fvm",
+      "//third_party/fuchsia-sdk/sdk/tools/${test_host_cpu}/merkleroot",
+      "//third_party/fuchsia-sdk/sdk/tools/${test_host_cpu}/pm",
+
+      # TODO(crbug.com/1162314) Remove "symbolize" when transition to
+      # "symbolizer" is complete.
+      "//third_party/fuchsia-sdk/sdk/tools/${test_host_cpu}/symbolize",
+
+      "//third_party/fuchsia-sdk/sdk/tools/${test_host_cpu}/symbolizer",
+      "//third_party/fuchsia-sdk/sdk/tools/${test_host_cpu}/zbi",
+    ]
+
+    if (test_isolate_uses_emulator) {
+      data += [
+        "${boot_image_root}/qemu/qemu-kernel.kernel",
+        "${boot_image_root}/qemu/storage-full.blk",
+        "${boot_image_root}/qemu/zircon-a.zbi",
+        "//third_party/fuchsia-sdk/sdk/tools/${test_host_cpu}/fvdl",
+        "//third_party/qemu-${host_os}-${test_host_cpu}/",
+        "${aemu_root}/",
+      ]
+    }
+
+    foreach(fuchsia_additional_boot_image, fuchsia_additional_boot_images) {
+      data += [ "${fuchsia_additional_boot_image}/" ]
+    }
+
+    package_paths = [ rebase_path(_package_path, root_build_dir) ]
+    if (defined(invoker.package_deps)) {
+      foreach(package_dep, invoker.package_deps) {
+        package_dep_target = package_dep[0]
+        package_dep_name = package_dep[1]
+
+        data_deps += [
+          package_dep_target,
+          package_dep_target + "__archive-manifest",
+          package_dep_target + "__archive-metadata",
+        ]
+        package_dep_path = rebase_path(
+                get_label_info(package_dep_target, "target_gen_dir") + "/" +
+                    package_dep_name + "/" + package_dep_name + ".far",
+                root_build_dir)
+        package_paths += [ package_dep_path ]
+      }
+    }
+
+    foreach(package_path, package_paths) {
+      executable_args += [
+        "--package",
+        "@WrappedPath(${package_path})",
+      ]
+    }
+
+    executable_args += [
+      "--out-dir",
+      "@WrappedPath(.)",
+      "--target-cpu",
+      target_cpu,
+      "--package-name",
+      _pkg_shortname,
+    ]
+
+    if (defined(invoker.use_run_test_component) &&
+        invoker.use_run_test_component) {
+      executable_args += [ "--use-run-test-component" ]
+    }
+
+    if (defined(invoker.use_test_server) && invoker.use_test_server) {
+      executable_args += [ "--enable-test-server" ]
+    }
+
+    if (default_fuchsia_build_dir_for_installation != "") {
+      executable_args += [
+        "--fuchsia-out-dir",
+        default_fuchsia_build_dir_for_installation,
+      ]
+    }
+
+    if (default_fuchsia_device_node_name != "") {
+      executable_args += [
+        "--node-name",
+        default_fuchsia_device_node_name,
+      ]
+    }
+  }
+
+  # Produces a script which installs a package and its dependencies into the
+  # package repository of a pre-existing Fuchsia build directory.
+  generate_wrapper(_generate_installer_target) {
+    executable = rebase_path("//build/fuchsia/deploy_to_pkg_repo.py")
+    wrapper_script = generated_install_pkg_script_path
+
+    data_deps = [ invoker.package ]
+    if (defined(invoker.data_deps)) {
+      data_deps += invoker.data_deps
+    }
+
+    # Build a list of all packages to install, and pass the list to the runner
+    # script.
+    package_paths = [ rebase_path(_package_path, root_build_dir) ]
+    if (defined(invoker.package_deps)) {
+      foreach(package_dep, invoker.package_deps) {
+        package_dep_target = package_dep[0]
+        package_dep_name = package_dep[1]
+
+        data_deps += [ package_dep_target ]
+        package_dep_path = rebase_path(
+                get_label_info(package_dep_target, "target_gen_dir") + "/" +
+                    package_dep_name + "/" + package_dep_name + ".far",
+                root_build_dir)
+        package_paths += [ package_dep_path ]
+      }
+    }
+    executable_args = []
+    foreach(package_path, package_paths) {
+      executable_args += [
+        "--package",
+        "@WrappedPath(${package_path})",
+      ]
+
+      if (default_fuchsia_build_dir_for_installation != "") {
+        executable_args += [
+          "--fuchsia-out-dir",
+          default_fuchsia_build_dir_for_installation,
+        ]
+      }
+    }
+  }
+
+  group(target_name) {
+    deps = [ ":${_generate_installer_target}" ]
+
+    if (!defined(invoker.install_only) || invoker.install_only == false) {
+      deps += [ ":${_generate_runner_target}" ]
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/fuchsia/gfx_tests.cmx b/third_party/libwebrtc/build/config/fuchsia/gfx_tests.cmx
new file mode 100644
index 0000000000..0786fb0b98
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/gfx_tests.cmx
@@ -0,0 +1,31 @@
+{
+  "sandbox": {
+    "features": [
+      "deprecated-ambient-replace-as-executable",
+      "isolated-persistent-storage",
+      "isolated-temp",
+      "vulkan"
+    ],
+    "dev": [
+      "null",
+      "zero"
+    ],
+    "services": [
+      "fuchsia.accessibility.semantics.SemanticsManager",
+      "fuchsia.device.NameProvider",
+      "fuchsia.fonts.Provider",
+      "fuchsia.intl.PropertyProvider",
+      "fuchsia.logger.LogSink",
+      "fuchsia.media.ProfileProvider",
+      "fuchsia.memorypressure.Provider",
+      "fuchsia.process.Launcher",
+      "fuchsia.sys.Environment",
+      "fuchsia.sys.Loader",
+      "fuchsia.sysmem.Allocator",
+      "fuchsia.tracing.provider.Registry",
+      "fuchsia.ui.policy.Presenter",
+      "fuchsia.ui.scenic.Scenic",
+      "fuchsia.vulkan.loader.Loader"
+    ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/fuchsia/package.gni b/third_party/libwebrtc/build/config/fuchsia/package.gni
new file mode 100644
index 0000000000..ff6ffd0a3d
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/package.gni
@@ -0,0 +1,114 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//third_party/fuchsia-sdk/sdk/build/component.gni")
+import("//third_party/fuchsia-sdk/sdk/build/package.gni")
+
+# DEPRECATED: Use the Fuchsia SDK's fuchsia_component() and fuchsia_package()
+# templates directly, in new code.
+#
+# Creates a Fuchsia .far package file containing a Fuchsia component.
+#
+# Parameters are:
+# package_name_override: Specifies the name of the package to generate,
+#     if different than |target_name|.
+# binary: The executable target which should be launched.
+# manifest: A path to the manifest that will be used.
+#     "testonly" targets default to using
+#     //build/config/fuchsia/tests-with-exec.cmx.
+#     Non-test targets must explicitly specify a |manifest|.
+# additional_manifests: Manifest files that should be included in the package in
+#     the /meta directory. This allows to package more than one component per
+#     manifest. These manifest files must specify program/binary to run, which
+#     is not required for the main manifest file where this parameter is added
+#     during build.
+# component_name_override: If set, specifies the name of the component.
+#     By default, the component name is the same as the package name.
+# deps: Additional targets to build and include in the package (optional).
+#
+# TODO(https://crbug.com/1050703): Migrate consumers to GN SDK equivalents.
+template("cr_fuchsia_package") {
+  assert(defined(invoker.binary))
+
+  if (defined(invoker.package_name_override)) {
+    _package_name = invoker.package_name_override
+  } else {
+    _package_name = invoker.target_name
+  }
+
+  _package_contents = [ invoker.binary ]
+  if (defined(invoker.deps)) {
+    _package_contents += invoker.deps
+  }
+
+  _component_cmx_target = target_name + "__cr-component-cmx"
+  _component_target = target_name + "__cr-component"
+  _package_components = [ ":${_component_target}" ]
+  _component_manifest = "${target_gen_dir}/${target_name}.cmx"
+
+  # Process the CMX fragment in |manifest| to get a full manifest.
+  action(_component_cmx_target) {
+    forward_variables_from(invoker,
+                           [
+                             "deps",
+                             "testonly",
+                           ])
+
+    script = "//build/config/fuchsia/build_cmx_from_fragment.py"
+
+    inputs = [ invoker.manifest ]
+    outputs = [ _component_manifest ]
+
+    args = [
+      "--cmx-fragment",
+      rebase_path(invoker.manifest),
+      "--cmx",
+      rebase_path(_component_manifest),
+      "--program",
+      get_label_info(invoker.binary, "name"),
+    ]
+  }
+
+  # Declare the primary component for this package.
+  fuchsia_component(_component_target) {
+    forward_variables_from(invoker, [ "testonly" ])
+
+    deps = [ ":${_component_cmx_target}" ]
+    data_deps = _package_contents
+    manifest = _component_manifest
+
+    if (defined(invoker.component_name_override)) {
+      manifest_output_name = "${invoker.component_name_override}"
+    } else {
+      manifest_output_name = "${_package_name}"
+    }
+  }
+
+  # Bundle manifests providing additional entrypoints into the package.
+  if (defined(invoker.additional_manifests)) {
+    foreach(filename, invoker.additional_manifests) {
+      _additional_component_target =
+          target_name + "_" + get_path_info(filename, "name")
+      _package_components += [ ":${_additional_component_target}" ]
+      fuchsia_component(_additional_component_target) {
+        forward_variables_from(invoker, [ "testonly" ])
+        data_deps = _package_contents
+        manifest = filename
+
+        # Depend upon the invoker's |deps|, in case they include a dependency
+        # responsible for generating this additional component's manifest file.
+        deps = _package_contents
+      }
+    }
+  }
+
+  fuchsia_package(target_name) {
+    forward_variables_from(invoker, [ "testonly" ])
+    package_name = _package_name
+    if (defined(invoker.excluded_files)) {
+      excluded_files = invoker.excluded_files
+    }
+    deps = _package_components
+  }
+}
diff --git a/third_party/libwebrtc/build/config/fuchsia/rules.gni b/third_party/libwebrtc/build/config/fuchsia/rules.gni
new file mode 100644
index 0000000000..689e130b65
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/rules.gni
@@ -0,0 +1,5 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/fuchsia/generate_runner_scripts.gni")
diff --git a/third_party/libwebrtc/build/config/fuchsia/sizes.gni b/third_party/libwebrtc/build/config/fuchsia/sizes.gni
new file mode 100644
index 0000000000..20a5bf831e
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/sizes.gni
@@ -0,0 +1,46 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/util/generate_wrapper.gni")
+
+template("compute_fuchsia_package_sizes") {
+  generate_wrapper(target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "data",
+                             "data_deps",
+                           ])
+    testonly = true
+    executable = "//build/fuchsia/binary_sizes.py"
+    wrapper_script = "$root_out_dir/bin/run_${target_name}"
+
+    assert(target_cpu == "arm64" || target_cpu == "x64",
+           "target_cpu must be arm64 or x64")
+
+    if (!defined(data)) {
+      data = []
+    }
+
+    if (!defined(data_deps)) {
+      data_deps = []
+    }
+
+    # Declares the files that are needed for test execution on the
+    # swarming test client.
+    data += [
+      "//build/fuchsia/",
+      "//fuchsia/release/size_tests/",
+      "//third_party/fuchsia-sdk/sdk/arch/",
+      "//third_party/fuchsia-sdk/sdk/tools/${target_cpu}/",
+    ]
+
+    executable_args = [
+      "--output-directory",
+      "@WrappedPath(.)",
+    ]
+    if (defined(invoker.executable_args)) {
+      executable_args += invoker.executable_args
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/fuchsia/symbol_archive.gni b/third_party/libwebrtc/build/config/fuchsia/symbol_archive.gni
new file mode 100644
index 0000000000..9dcb53cae0
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/symbol_archive.gni
@@ -0,0 +1,47 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+assert(is_fuchsia)
+
+# Creates a tarball of unstripped binaries, structured according to the
+# ".build_ids" convention used by the symbolizer and GNU GDB.
+#
+# Parameters:
+#   deps: Must all be cr_fuchsia_package() or fuchsia_package() targets.
+#   ids_txt: The "ids.txt" file which lists the relative paths to unstripped
+#            executables and libraries, along with their build IDs.
+#   archive_name: The path to the compressed tarball that will be generated.
+template("symbol_archive") {
+  assert(!is_debug)
+
+  action(target_name) {
+    _ids_txt = invoker.ids_txt
+    _build_ids = invoker.archive_name
+
+    script = "//build/config/fuchsia/build_symbol_archive.py"
+
+    inputs = [ _ids_txt ]
+
+    outputs = [ _build_ids ]
+
+    # For each package in |deps| it is necessary to additionally depend upon
+    # the corresponding archive-manifest target, which is what creates the
+    # ids.txt file.
+    deps = []
+    foreach(package, invoker.deps) {
+      deps += [
+        package,
+        package + "__archive-manifest",
+      ]
+    }
+
+    args = [
+      rebase_path(_ids_txt),
+      "-o",
+      rebase_path(_build_ids),
+      "--fuchsia-build-id-dir",
+      rebase_path("//third_party/fuchsia-sdk/sdk/.build-id"),
+    ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/OWNERS b/third_party/libwebrtc/build/config/fuchsia/test/OWNERS
new file mode 100644
index 0000000000..3be17de545
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/OWNERS
@@ -0,0 +1,7 @@
+file://build/fuchsia/OWNERS
+
+per-file *.test-cmx=set noparent
+per-file *.test-cmx=ddorwin@chromium.org
+per-file *.test-cmx=wez@chromium.org
+# Please prefer the above when possible.
+per-file *.test-cmx=file://fuchsia/SECURITY_OWNERS
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/README.md b/third_party/libwebrtc/build/config/fuchsia/test/README.md
new file mode 100644
index 0000000000..8427f4a49f
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/README.md
@@ -0,0 +1,61 @@
+## CMX Fragments
+
+This directory contains the cmx fragments that are required for running
+Fuchsia tests hermetically. Tests start from `minimum_capabilities.test-cmx`
+and add additional capabilities as necessary by providing the
+`additional_manifest_fragments` argument. Some fragments are explained in detail
+below:
+
+### General Purpose Fragments
+
+#### font_capabilities.test-cmx
+For tests that test fonts by providing `fuchsia.fonts.Provider`.
+
+#### jit_capabilities.test-cmx
+Required by tests that execute JavaScript. Should only be required in a small
+number of tests.
+
+#### minimum_capabilites.test-cmx
+Capabilities required by anything that uses `//base/test`, used as the base
+fragment for all test suites.
+
+#### read_debug_data.test-cmx
+Required by tests that need access to its debug directory. Should only be
+required in a small number of tests.
+
+#### test_logger_capabilities.test-cmx
+For tests that test logging functionality by providing `fuchsia.logger.Log`.
+
+### WebEngine Fragments
+The following fragments are specific to WebEngine functionality as documented
+documentation at
+https://fuchsia.dev/reference/fidl/fuchsia.web#CreateContextParams and
+https://fuchsia.dev/reference/fidl/fuchsia.web#ContextFeatureFlags.
+Any test-specific exceptions are documented for each file.
+
+#### audio_capabilities.test-cmx
+Corresponds to the `AUDIO` flag. Required for enabling audio input and output.
+
+#### network_capabilities.test-cmx
+Corresponds to the `NETWORK` flag. Required for enabling network access. Note
+that access to the root SSL certificates is not needed if ContextProvider is
+used to launch the `Context`. The `fuchsia.device.NameProvider` dependency comes
+from fdio.
+
+#### present_view_capabilities.test-cmx
+Services that are needed to render web content in a Scenic view and present it.
+Most services are required per the FIDL documentation.
+`fuchsia.ui.policy.Presenter` is additionally required by tests that create
+views.
+
+#### vulkan_capabilities.test-cmx
+Corresponds to the `VULKAN` flag. Required for enabling GPU-accelerated
+rendering of the web content.
+
+#### web_engine_required_capabilities.test-cmx
+Contains services that need to be present when creating a
+`fuchsia.web.Context`. Note that the `fuchsia.scheduler.ProfileProvider` service
+is only used in tests that encounter memory pressure code.
+
+#### web_instance_host_capabilities.test-cmx
+Contains services that need to be present to use `WebInstanceHost`.
\ No newline at end of file
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/audio_capabilities.test-cmx b/third_party/libwebrtc/build/config/fuchsia/test/audio_capabilities.test-cmx
new file mode 100644
index 0000000000..2e2013f9ea
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/audio_capabilities.test-cmx
@@ -0,0 +1,18 @@
+{
+  "facets": {
+    "fuchsia.test": {
+      "injected-services": {
+        "fuchsia.mediacodec.CodecFactory": "fuchsia-pkg://fuchsia.com/codec_factory#meta/codec_factory.cmx"
+      },
+      "system-services": [
+        "fuchsia.media.Audio"
+      ]
+    }
+  },
+  "sandbox": {
+    "services": [
+      "fuchsia.media.Audio",
+      "fuchsia.mediacodec.CodecFactory"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/font_capabilities.test-cmx b/third_party/libwebrtc/build/config/fuchsia/test/font_capabilities.test-cmx
new file mode 100644
index 0000000000..4c8661bb80
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/font_capabilities.test-cmx
@@ -0,0 +1,14 @@
+{
+  "facets": {
+    "fuchsia.test": {
+      "injected-services": {
+        "fuchsia.fonts.Provider": "fuchsia-pkg://fuchsia.com/fonts#meta/fonts.cmx",
+      }
+    }
+  },
+  "sandbox": {
+    "services": [
+      "fuchsia.fonts.Provider"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/jit_capabilities.test-cmx b/third_party/libwebrtc/build/config/fuchsia/test/jit_capabilities.test-cmx
new file mode 100644
index 0000000000..ff70e256be
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/jit_capabilities.test-cmx
@@ -0,0 +1,7 @@
+{
+  "sandbox": {
+    "features": [
+      "deprecated-ambient-replace-as-executable"
+    ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/minimum_capabilities.test-cmx b/third_party/libwebrtc/build/config/fuchsia/test/minimum_capabilities.test-cmx
new file mode 100644
index 0000000000..5b9f7bf705
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/minimum_capabilities.test-cmx
@@ -0,0 +1,30 @@
+{
+  "facets": {
+    "fuchsia.test": {
+      "injected-services": {
+        "fuchsia.intl.PropertyProvider": "fuchsia-pkg://fuchsia.com/intl_property_manager#meta/intl_property_manager.cmx"
+      },
+      "system-services": [
+        "fuchsia.boot.ReadOnlyLog"
+      ]
+    }
+  },
+  "sandbox": {
+    "dev": [
+      "null",
+      "zero"
+    ],
+    "features": [
+      "isolated-persistent-storage",
+      "isolated-temp"
+    ],
+    "services": [
+      "fuchsia.intl.PropertyProvider",
+      "fuchsia.logger.LogSink",
+      "fuchsia.media.ProfileProvider",
+      "fuchsia.process.Launcher",
+      "fuchsia.sys.Launcher",
+      "fuchsia.sys.Loader"
+    ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/network_capabilities.test-cmx b/third_party/libwebrtc/build/config/fuchsia/test/network_capabilities.test-cmx
new file mode 100644
index 0000000000..7218c3f875
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/network_capabilities.test-cmx
@@ -0,0 +1,25 @@
+{
+  "facets": {
+    "fuchsia.test": {
+      "injected-services": {
+        "fuchsia.net.interfaces.State": "fuchsia-pkg://fuchsia.com/netstack#meta/netstack.cmx",
+        "fuchsia.net.name.Lookup": "fuchsia-pkg://fuchsia.com/dns-resolver#meta/dns-resolver.cmx",
+        "fuchsia.posix.socket.Provider": "fuchsia-pkg://fuchsia.com/netstack#meta/netstack.cmx"
+      },
+      "system-services": [
+        "fuchsia.device.NameProvider"
+      ]
+    }
+  },
+  "sandbox": {
+    "features": [
+      "root-ssl-certificates"
+    ],
+    "services": [
+      "fuchsia.device.NameProvider",
+      "fuchsia.net.name.Lookup",
+      "fuchsia.net.interfaces.State",
+      "fuchsia.posix.socket.Provider"
+    ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/present_view_capabilities.test-cmx b/third_party/libwebrtc/build/config/fuchsia/test/present_view_capabilities.test-cmx
new file mode 100644
index 0000000000..201c8b2212
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/present_view_capabilities.test-cmx
@@ -0,0 +1,24 @@
+{
+  "facets": {
+    "fuchsia.test": {
+      "injected-services": {
+        "fuchsia.accessibility.semantics.SemanticsManager": "fuchsia-pkg://fuchsia.com/a11y-manager#meta/a11y-manager.cmx",
+        "fuchsia.ui.input3.Keyboard": "fuchsia-pkg://fuchsia.com/ime_service#meta/ime_service.cmx",
+      },
+      "system-services": [
+        "fuchsia.sysmem.Allocator",
+        "fuchsia.ui.policy.Presenter",
+        "fuchsia.ui.scenic.Scenic"
+      ]
+    }
+  },
+  "sandbox": {
+    "services": [
+      "fuchsia.accessibility.semantics.SemanticsManager",
+      "fuchsia.sysmem.Allocator",
+      "fuchsia.ui.input3.Keyboard",
+      "fuchsia.ui.policy.Presenter",
+      "fuchsia.ui.scenic.Scenic"
+    ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/read_debug_data.test-cmx b/third_party/libwebrtc/build/config/fuchsia/test/read_debug_data.test-cmx
new file mode 100644
index 0000000000..b0c95b0883
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/read_debug_data.test-cmx
@@ -0,0 +1,7 @@
+{
+  "sandbox": {
+    "features": [
+      "hub"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/test_logger_capabilities.test-cmx b/third_party/libwebrtc/build/config/fuchsia/test/test_logger_capabilities.test-cmx
new file mode 100644
index 0000000000..68b2a67012
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/test_logger_capabilities.test-cmx
@@ -0,0 +1,7 @@
+{
+  "sandbox": {
+    "services": [
+      "fuchsia.logger.Log"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/vulkan_capabilities.test-cmx b/third_party/libwebrtc/build/config/fuchsia/test/vulkan_capabilities.test-cmx
new file mode 100644
index 0000000000..0436ffd5e3
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/vulkan_capabilities.test-cmx
@@ -0,0 +1,19 @@
+{
+  "facets": {
+    "fuchsia.test": {
+      "system-services": [
+        "fuchsia.sysmem.Allocator",
+        "fuchsia.vulkan.loader.Loader"
+      ]
+    }
+  },
+  "sandbox": {
+    "features": [
+      "vulkan"
+    ],
+    "services": [
+      "fuchsia.sysmem.Allocator",
+      "fuchsia.vulkan.loader.Loader"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/web_engine_required_capabilities.test-cmx b/third_party/libwebrtc/build/config/fuchsia/test/web_engine_required_capabilities.test-cmx
new file mode 100644
index 0000000000..4cb61fe7f1
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/web_engine_required_capabilities.test-cmx
@@ -0,0 +1,25 @@
+{
+  "facets": {
+    "fuchsia.test": {
+      "injected-services": {
+        "fuchsia.fonts.Provider": "fuchsia-pkg://fuchsia.com/fonts#meta/fonts.cmx",
+        "fuchsia.memorypressure.Provider": "fuchsia-pkg://fuchsia.com/memory_monitor#meta/memory_monitor.cmx",
+        "fuchsia.web.ContextProvider": "fuchsia-pkg://fuchsia.com/web_engine#meta/context_provider.cmx",
+      },
+      "system-services": [
+        "fuchsia.device.NameProvider",
+        "fuchsia.scheduler.ProfileProvider",
+        "fuchsia.sysmem.Allocator"
+      ]
+    }
+  },
+  "sandbox": {
+    "services": [
+      "fuchsia.device.NameProvider",
+      "fuchsia.fonts.Provider",
+      "fuchsia.memorypressure.Provider",
+      "fuchsia.sysmem.Allocator",
+      "fuchsia.web.ContextProvider"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/third_party/libwebrtc/build/config/fuchsia/test/web_instance_host_capabilities.test-cmx b/third_party/libwebrtc/build/config/fuchsia/test/web_instance_host_capabilities.test-cmx
new file mode 100644
index 0000000000..762916ba9f
--- /dev/null
+++ b/third_party/libwebrtc/build/config/fuchsia/test/web_instance_host_capabilities.test-cmx
@@ -0,0 +1,8 @@
+{
+  "sandbox": {
+    "services": [
+      "fuchsia.sys.Environment",
+      "fuchsia.sys.Loader"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/third_party/libwebrtc/build/config/gcc/BUILD.gn b/third_party/libwebrtc/build/config/gcc/BUILD.gn
new file mode 100644
index 0000000000..ff47e2542c
--- /dev/null
+++ b/third_party/libwebrtc/build/config/gcc/BUILD.gn
@@ -0,0 +1,116 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/c++/c++.gni")
+import("//build/config/compiler/compiler.gni")
+import("//build/config/sanitizers/sanitizers.gni")
+import("//build/config/sysroot.gni")
+import("//build/toolchain/toolchain.gni")
+
+declare_args() {
+  # When non empty, overrides the target rpath value. This allows a user to
+  # make a Chromium build where binaries and shared libraries are meant to be
+  # installed into separate directories, like /usr/bin/chromium and
+  # /usr/lib/chromium for instance. It is useful when a build system that
+  # generates a whole target root filesystem (like Yocto) is used on top of gn,
+  # especially when cross-compiling.
+  # Note: this gn arg is similar to gyp target_rpath generator flag.
+  gcc_target_rpath = ""
+  ldso_path = ""
+}
+
+# This config causes functions not to be automatically exported from shared
+# libraries. By default, all symbols are exported but this means there are
+# lots of exports that slow everything down. In general we explicitly mark
+# which functions we want to export from components.
+#
+# Some third_party code assumes all functions are exported so this is separated
+# into its own config so such libraries can remove this config to make symbols
+# public again.
+#
+# See http://gcc.gnu.org/wiki/Visibility
+config("symbol_visibility_hidden") {
+  cflags = [ "-fvisibility=hidden" ]
+
+  # Visibility attribute is not supported on AIX.
+  if (current_os != "aix") {
+    cflags_cc = [ "-fvisibility-inlines-hidden" ]
+    cflags_objcc = cflags_cc
+  }
+}
+
+# This config is usually set when :symbol_visibility_hidden is removed.
+# It's often a good idea to set visibility explicitly, as there're flags
+# which would error out otherwise (e.g. -fsanitize=cfi-unrelated-cast)
+config("symbol_visibility_default") {
+  cflags = [ "-fvisibility=default" ]
+}
+
+# The rpath is the dynamic library search path. Setting this config on a link
+# step will put the directory where the build generates shared libraries into
+# the rpath.
+#
+# This is required for component builds since the build generates many shared
+# libraries in the build directory that we expect to be automatically loaded.
+# It will be automatically applied in this case by :executable_config.
+#
+# In non-component builds, certain test binaries may expect to load dynamic
+# libraries from the current directory. As long as these aren't distributed,
+# this is OK. For these cases use something like this:
+#
+#  if ((is_linux || is_chromeos) && !is_component_build) {
+#    configs += [ "//build/config/gcc:rpath_for_built_shared_libraries" ]
+#  }
+config("rpath_for_built_shared_libraries") {
+  if (!is_android && current_os != "aix") {
+    # Note: Android, Aix don't support rpath.
+    if (current_toolchain != default_toolchain || gcc_target_rpath == "") {
+      ldflags = [
+        # Want to pass "\$". GN will re-escape as required for ninja.
+        "-Wl,-rpath=\$ORIGIN",
+      ]
+    } else {
+      ldflags = [ "-Wl,-rpath=${gcc_target_rpath}" ]
+    }
+    if (current_toolchain == default_toolchain && ldso_path != "") {
+      ldflags += [ "-Wl,--dynamic-linker=${ldso_path}" ]
+    }
+  }
+}
+
+if (is_component_build && !is_android) {
+  # See the rpath_for... config above for why this is necessary for component
+  # builds.
+  executable_and_shared_library_configs_ =
+      [ ":rpath_for_built_shared_libraries" ]
+} else {
+  executable_and_shared_library_configs_ = []
+}
+
+# Settings for executables.
+config("executable_config") {
+  configs = executable_and_shared_library_configs_
+  ldflags = [ "-pie" ]
+  if (is_android) {
+    ldflags += [
+      "-Bdynamic",
+      "-Wl,-z,nocopyreloc",
+    ]
+  }
+
+  if (!is_android && current_os != "aix") {
+    ldflags += [
+      # TODO(GYP): Do we need a check on the binutils version here?
+      #
+      # Newer binutils don't set DT_RPATH unless you disable "new" dtags
+      # and the new DT_RUNPATH doesn't work without --no-as-needed flag.
+      "-Wl,--disable-new-dtags",
+    ]
+  }
+}
+
+# Settings for shared libraries.
+config("shared_library_config") {
+  configs = executable_and_shared_library_configs_
+}
diff --git a/third_party/libwebrtc/build/config/gclient_args.gni b/third_party/libwebrtc/build/config/gclient_args.gni
new file mode 100644
index 0000000000..fa77ecc6d4
--- /dev/null
+++ b/third_party/libwebrtc/build/config/gclient_args.gni
@@ -0,0 +1 @@
+# Generated from 'DEPS'
\ No newline at end of file
diff --git a/third_party/libwebrtc/build/config/get_host_byteorder.py b/third_party/libwebrtc/build/config/get_host_byteorder.py
new file mode 100755
index 0000000000..fc01d85718
--- /dev/null
+++ b/third_party/libwebrtc/build/config/get_host_byteorder.py
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Get Byteorder of host architecture"""
+
+from __future__ import print_function
+
+import sys
+
+print(sys.byteorder)
diff --git a/third_party/libwebrtc/build/config/host_byteorder.gni b/third_party/libwebrtc/build/config/host_byteorder.gni
new file mode 100644
index 0000000000..48a1a7f1e3
--- /dev/null
+++ b/third_party/libwebrtc/build/config/host_byteorder.gni
@@ -0,0 +1,27 @@
+# Copyright (c) 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This header file defines the "host_byteorder" variable.
+# Not that this is currently used only for building v8.
+# The chromium code generally assumes little-endianness.
+declare_args() {
+  host_byteorder = "undefined"
+}
+
+# Detect host byteorder
+# ppc64 can be either BE or LE
+if (host_cpu == "ppc64") {
+  if (current_os == "aix") {
+    host_byteorder = "big"
+  } else {
+    # Only use the script when absolutely necessary
+    host_byteorder =
+        exec_script("//build/config/get_host_byteorder.py", [], "trim string")
+  }
+} else if (host_cpu == "ppc" || host_cpu == "s390" || host_cpu == "s390x" ||
+           host_cpu == "mips" || host_cpu == "mips64") {
+  host_byteorder = "big"
+} else {
+  host_byteorder = "little"
+}
diff --git a/third_party/libwebrtc/build/config/ios/BUILD.gn b/third_party/libwebrtc/build/config/ios/BUILD.gn
new file mode 100644
index 0000000000..525c439e7e
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/BUILD.gn
@@ -0,0 +1,264 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/ios/ios_sdk.gni")
+import("//build/toolchain/goma.gni")
+import("//build/toolchain/toolchain.gni")
+import("//build_overrides/build.gni")
+
+declare_args() {
+  # Enabling this option makes clang compile to an intermediate
+  # representation ("bitcode"), and not to native code. This is preferred
+  # when including WebRTC in the apps that will be sent to Apple's App Store
+  # and mandatory for the apps that run on watchOS or tvOS.
+  # The option only works when building with Xcode (use_xcode_clang = true).
+  # Mimicking how Xcode handles it, the production builds (is_debug = false)
+  # get real bitcode sections added, while the debug builds (is_debug = true)
+  # only get bitcode-section "markers" added in them.
+  enable_ios_bitcode = false
+}
+
+# This is included by reference in the //build/config/compiler config that
+# is applied to all targets. It is here to separate out the logic.
+config("compiler") {
+  # These flags are shared between the C compiler and linker.
+  common_flags = []
+
+  # CPU architecture.
+  if (target_cpu == "x64") {
+    triplet_cpu = "x86_64"
+  } else if (target_cpu == "x86") {
+    triplet_cpu = "i386"
+  } else if (target_cpu == "arm" || target_cpu == "armv7") {
+    triplet_cpu = "armv7"
+  } else if (target_cpu == "arm64") {
+    triplet_cpu = "arm64"
+  } else {
+    assert(false, "unsupported cpu: $target_cpu")
+  }
+
+  # Environment.
+  if (target_environment == "simulator") {
+    triplet_environment = "-simulator"
+  } else if (target_environment == "device") {
+    triplet_environment = ""
+  } else if (target_environment == "catalyst") {
+    triplet_environment = "-macabi"
+  } else {
+    assert(false, "unsupported environment: $target_environment")
+  }
+
+  # OS.
+  triplet_os = "apple-ios"
+
+  # Set target.
+  common_flags = [
+    "-target",
+    "$triplet_cpu-$triplet_os$ios_deployment_target$triplet_environment",
+  ]
+
+  # This is here so that all files get recompiled after an Xcode update.
+  # (defines are passed via the command line, and build system rebuild things
+  # when their commandline changes). Nothing should ever read this define.
+  defines = [ "CR_XCODE_VERSION=$xcode_version" ]
+
+  asmflags = common_flags
+  cflags = common_flags
+  swiftflags = common_flags
+
+  swiftflags += [
+    "-swift-version",
+    "5",
+  ]
+
+  # Without this, the constructors and destructors of a C++ object inside
+  # an Objective C struct won't be called, which is very bad.
+  cflags_objcc = [ "-fobjc-call-cxx-cdtors" ]
+
+  ldflags = common_flags
+}
+
+# This is included by reference in the //build/config/compiler:runtime_library
+# config that is applied to all targets. It is here to separate out the logic
+# that is iOS-only. Please see that target for advice on what should go in
+# :runtime_library vs. :compiler.
+config("runtime_library") {
+  # The variable ios_sdk_path is relative to root_build_dir when using Goma RBE
+  # and system Xcode (since Goma RBE only supports paths relative to source).
+  # Rebase the value in that case since gn does not convert paths in compiler
+  # flags (since it is not aware they are paths).
+  _sdk_root = ios_sdk_path
+  if (use_system_xcode && use_goma) {
+    _sdk_root = rebase_path(ios_sdk_path, root_build_dir)
+  }
+
+  common_flags = [
+    "-isysroot",
+    _sdk_root,
+  ]
+  swiftflags = [
+    "-sdk",
+    _sdk_root,
+  ]
+
+  if (target_environment == "catalyst") {
+    common_flags += [
+      "-isystem",
+      "$_sdk_root/System/iOSSupport/usr/include",
+      "-iframework",
+      "$_sdk_root/System/iOSSupport/System/Library/Frameworks",
+    ]
+  }
+
+  if (use_xcode_clang && enable_ios_bitcode) {
+    if (is_debug) {
+      common_flags += [ "-fembed-bitcode-marker" ]
+    } else {
+      common_flags += [ "-fembed-bitcode" ]
+    }
+  }
+
+  asmflags = common_flags
+  cflags = common_flags
+  ldflags = common_flags
+}
+
+config("ios_executable_flags") {
+  ldflags = []
+
+  # On "catalyst", the bundle structure is different (uses the same structure
+  # as a regular macOS app), so an additional -rpath is required.
+  if (target_environment == "catalyst") {
+    ldflags += [ "-Wl,-rpath,@loader_path/../Frameworks" ]
+  }
+
+  ldflags += [ "-Wl,-rpath,@executable_path/Frameworks" ]
+}
+
+config("ios_extension_executable_flags") {
+  configs = default_executable_configs
+
+  ldflags = [
+    "-e",
+    "_NSExtensionMain",
+    "-fapplication-extension",
+  ]
+
+  # On "catalyst", the bundle structure is different (uses the same structure
+  # as a regular macOS app), so an additional -rpath is required.
+  if (target_environment == "catalyst") {
+    ldflags += [ "-Wl,-rpath,@loader_path/../../../../Frameworks" ]
+  }
+
+  ldflags += [ "-Wl,-rpath,@executable_path/../../Frameworks" ]
+}
+
+config("ios_dynamic_flags") {
+  ldflags = [
+    # Always load Objective-C categories and class.
+    "-Wl,-ObjC",
+  ]
+
+  # The path to the Swift compatibility libraries (required to run code built
+  # with version N of the SDK on older version of the OS) is relative to the
+  # toolchains directory and changes with the environment.
+  _swift_compatibility_libs_dir_prefix = "$ios_toolchains_path/usr/lib/swift"
+  if (target_environment == "simulator") {
+    _swift_compatibility_libs_dir =
+        "$_swift_compatibility_libs_dir_prefix/iphonesimulator"
+  } else if (target_environment == "device") {
+    _swift_compatibility_libs_dir =
+        "$_swift_compatibility_libs_dir_prefix/iphoneos"
+  } else if (target_environment == "catalyst") {
+    _swift_compatibility_libs_dir =
+        "$_swift_compatibility_libs_dir_prefix/maccatalyst"
+  }
+
+  lib_dirs = [
+    "$ios_sdk_path/usr/lib/swift",
+    _swift_compatibility_libs_dir,
+  ]
+}
+
+config("ios_shared_library_flags") {
+  ldflags = [
+    "-Wl,-rpath,@executable_path/Frameworks",
+    "-Wl,-rpath,@loader_path/Frameworks",
+  ]
+}
+
+config("disable_implicit_retain_self_warning") {
+  cflags_objc = [ "-Wno-implicit-retain-self" ]
+  cflags_objcc = cflags_objc
+}
+
+config("xctest_config") {
+  # Use -iframework for XCTest.framework so that the compiler will treat it as a
+  # system framework and ignore warnings in XCTest framework headers.
+  common_flags = [
+    "-iframework",
+    rebase_path("$ios_sdk_platform_path/Developer/Library/Frameworks",
+                root_build_dir),
+  ]
+  cflags = common_flags
+  ldflags = common_flags
+
+  frameworks = [
+    "Foundation.framework",
+    "XCTest.framework",
+  ]
+}
+
+group("xctest") {
+  public_configs = [ ":xctest_config" ]
+}
+
+_xctrunner_path =
+    "$ios_sdk_platform_path/Developer/Library/Xcode/Agents/XCTRunner.app"
+
+# When building with Goma RBE, $ios_sdk_platform_path corresponds to a symlink
+# below $root_build_dir that points to the real SDK to use. Because the files
+# are below $root_build_dir, it is not possible to list them as a target input
+# without gn complaining (as it can't find a target creating those files).
+#
+# The symlinks are created by //build/config/apple/sdk_info.py script invoked
+# via exec_script() from //build/config/{ios/ios_sdk.gni,mac/mac_sdk.gni}.
+# As the invocation is done by exec_script, there is no target that can list
+# those files as output.
+#
+# To workaround this, add a target that pretends to create those files
+# (but does nothing). See https://crbug.com/1061487 for why this is needed.
+if (use_system_xcode && use_goma) {
+  action("copy_xctrunner_app") {
+    testonly = true
+    script = "//build/noop.py"
+    outputs = [
+      "$_xctrunner_path/Info.plist",
+      "$_xctrunner_path/PkgInfo",
+      "$_xctrunner_path/XCTRunner",
+    ]
+  }
+}
+
+# When creating the test runner for an XCUITest, the arm64e slice of the binary
+# must be removed (at least until the app ships with arm64e slice which is not
+# yet supported by Apple).
+action("xctest_runner_without_arm64e") {
+  testonly = true
+  script = "//build/config/ios/strip_arm64e.py"
+  sources = [ "$_xctrunner_path/XCTRunner" ]
+  outputs = [ "$target_out_dir/XCTRunner" ]
+  args = [
+    "--output",
+    rebase_path(outputs[0], root_build_dir),
+    "--input",
+    rebase_path(sources[0], root_build_dir),
+    "--xcode-version",
+    xcode_version,
+  ]
+
+  if (use_system_xcode && use_goma) {
+    deps = [ ":copy_xctrunner_app" ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/ios/BuildInfo.plist b/third_party/libwebrtc/build/config/ios/BuildInfo.plist
new file mode 100644
index 0000000000..3595e5aefb
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/BuildInfo.plist
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>BuildMachineOSBuild</key>
+  <string>${BUILD_MACHINE_OS_BUILD}</string>
+  <key>CFBundleSupportedPlatforms</key>
+  <array>
+    <string>${IOS_SUPPORTED_PLATFORM}</string>
+  </array>
+  <key>DTCompiler</key>
+  <string>${GCC_VERSION}</string>
+  <key>DTPlatformName</key>
+  <string>${IOS_PLATFORM_NAME}</string>
+  <key>DTPlatformVersion</key>
+  <string>${IOS_PLATFORM_VERSION}</string>
+  <key>DTPlatformBuild</key>
+  <string>${IOS_PLATFORM_BUILD}</string>
+  <key>DTSDKBuild</key>
+  <string>${IOS_SDK_BUILD}</string>
+  <key>DTSDKName</key>
+  <string>${IOS_SDK_NAME}</string>
+  <key>MinimumOSVersion</key>
+  <string>${IOS_DEPLOYMENT_TARGET}</string>
+  <key>DTXcode</key>
+  <string>${XCODE_VERSION}</string>
+  <key>DTXcodeBuild</key>
+  <string>${XCODE_BUILD}</string>
+  <key>UIDeviceFamily</key>
+  <array>
+    <integer>1</integer>
+    <integer>2</integer>
+  </array>
+</dict>
+</plist>
diff --git a/third_party/libwebrtc/build/config/ios/Host-Info.plist b/third_party/libwebrtc/build/config/ios/Host-Info.plist
new file mode 100644
index 0000000000..9f6f5deef9
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/Host-Info.plist
@@ -0,0 +1,126 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleDisplayName</key>
+	<string>${PRODUCT_NAME}</string>
+	<key>CFBundleExecutable</key>
+	<string>${EXECUTABLE_NAME}</string>
+	<key>CFBundleIdentifier</key>
+	<string>${IOS_BUNDLE_ID_PREFIX}.test.${EXECUTABLE_NAME:rfc1034identifier}</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>${PRODUCT_NAME}</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1.0</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsArbitraryLoads</key>
+		<true/>
+	</dict>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UILaunchImages</key>
+	<array>
+		<dict>
+			<key>UILaunchImageMinimumOSVersion</key>
+			<string>7.0</string>
+			<key>UILaunchImageName</key>
+			<string>Default</string>
+			<key>UILaunchImageOrientation</key>
+			<string>Portrait</string>
+			<key>UILaunchImageSize</key>
+			<string>{320, 480}</string>
+		</dict>
+		<dict>
+			<key>UILaunchImageMinimumOSVersion</key>
+			<string>7.0</string>
+			<key>UILaunchImageName</key>
+			<string>Default</string>
+			<key>UILaunchImageOrientation</key>
+			<string>Portrait</string>
+			<key>UILaunchImageSize</key>
+			<string>{320, 568}</string>
+		</dict>
+		<dict>
+			<key>UILaunchImageMinimumOSVersion</key>
+			<string>8.0</string>
+			<key>UILaunchImageName</key>
+			<string>Default</string>
+			<key>UILaunchImageOrientation</key>
+			<string>Portrait</string>
+			<key>UILaunchImageSize</key>
+			<string>{375, 667}</string>
+		</dict>
+		<dict>
+			<key>UILaunchImageMinimumOSVersion</key>
+			<string>8.0</string>
+			<key>UILaunchImageName</key>
+			<string>Default</string>
+			<key>UILaunchImageOrientation</key>
+			<string>Portrait</string>
+			<key>UILaunchImageSize</key>
+			<string>{414, 736}</string>
+		</dict>
+		<dict>
+			<key>UILaunchImageMinimumOSVersion</key>
+			<string>8.0</string>
+			<key>UILaunchImageName</key>
+			<string>Default</string>
+			<key>UILaunchImageOrientation</key>
+			<string>Landscape</string>
+			<key>UILaunchImageSize</key>
+			<string>{414, 736}</string>
+		</dict>
+	</array>
+	<key>UILaunchImages~ipad</key>
+	<array>
+		<dict>
+			<key>UILaunchImageMinimumOSVersion</key>
+			<string>7.0</string>
+			<key>UILaunchImageName</key>
+			<string>Default</string>
+			<key>UILaunchImageOrientation</key>
+			<string>Portrait</string>
+			<key>UILaunchImageSize</key>
+			<string>{768, 1024}</string>
+		</dict>
+		<dict>
+			<key>UILaunchImageMinimumOSVersion</key>
+			<string>7.0</string>
+			<key>UILaunchImageName</key>
+			<string>Default</string>
+			<key>UILaunchImageOrientation</key>
+			<string>Landscape</string>
+			<key>UILaunchImageSize</key>
+			<string>{768, 1024}</string>
+		</dict>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>
diff --git a/third_party/libwebrtc/build/config/ios/Module-Info.plist b/third_party/libwebrtc/build/config/ios/Module-Info.plist
new file mode 100644
index 0000000000..d1bf77faf0
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/Module-Info.plist
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>${EXECUTABLE_NAME}</string>
+  <key>CFBundleIdentifier</key>
+  <string>${IOS_BUNDLE_ID_PREFIX}.${MODULE_BUNDLE_ID:rfc1034identifier}</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>${PRODUCT_NAME}</string>
+  <key>CFBundlePackageType</key>
+  <string>BNDL</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1</string>
+  <key>NSPrincipalClass</key>
+  <string>${XCTEST_BUNDLE_PRINCIPAL_CLASS}</string>
+</dict>
+</plist>
diff --git a/third_party/libwebrtc/build/config/ios/OWNERS b/third_party/libwebrtc/build/config/ios/OWNERS
new file mode 100644
index 0000000000..6f3324f07c
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/OWNERS
@@ -0,0 +1 @@
+file://build/apple/OWNERS
diff --git a/third_party/libwebrtc/build/config/ios/asset_catalog.gni b/third_party/libwebrtc/build/config/ios/asset_catalog.gni
new file mode 100644
index 0000000000..84dd92cce2
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/asset_catalog.gni
@@ -0,0 +1,150 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/ios/ios_sdk.gni")
+
+# This template declares a bundle_data target that references an asset
+# catalog so that it is compiled to the asset catalog of the generated
+# bundle.
+#
+# The create_bundle target requires that all asset catalogs are part of an
+# .xcasset bundle. This requirement comes from actool that only receives
+# the path to the .xcasset bundle directory and not to the individual
+# .imageset directories.
+#
+# The requirement is a bit problematic as it prevents compiling only a
+# subset of the asset catakig that are contained in a .xcasset. This template
+# fixes that by instead copying the content of the asset catalog to temporary
+# .xcasset directory (below $root_out_dir) and defining a bundle_data
+# target that refers to those copies (this is efficient as the "copy" is
+# implemented by hardlinking if possible on macOS).
+#
+# Since the create_data target will only refer to the .xcasset directory
+# and additional "action" target that runs a dummy script is defined. It
+# does nothing but pretends to generate the .xcassets directory (while
+# it is really created as a side-effect of the "copy" step). This allows
+# to workaround the check in "gn" that all inputs below $root_out_dir have
+# to be outputs of another target with a public dependency path.
+#
+# This template also ensures that the file are only copied once when the
+# build targets multiple architectures at the same time (aka "fat build").
+#
+# Arguments
+#
+#     sources:
+#       required, list of strings, paths to the file contained in the
+#       asset catalog directory; this must contain the Contents.json file
+#       and all the image referenced by it (not enforced by the template).
+#
+#     asset_type:
+#       required, string, type of the asset catalog, that is the extension
+#       of the directory containing the images and the Contents.json file.
+#
+template("asset_catalog") {
+  assert(defined(invoker.sources) && invoker.sources != [],
+         "sources must be defined and not empty for $target_name")
+
+  assert(defined(invoker.asset_type) && invoker.asset_type != "",
+         "asset_type must be defined and not empty for $target_name")
+
+  if (is_fat_secondary_toolchain) {
+    group(target_name) {
+      public_deps = [ ":$target_name($primary_fat_toolchain_name)" ]
+    }
+  } else {
+    _copy_target_name = target_name + "__copy"
+    _data_target_name = target_name
+
+    _sources = invoker.sources
+    _outputs = []
+
+    # The compilation of resources into Assets.car is enabled automatically
+    # by the "create_bundle" target if any of the "bundle_data" sources's
+    # path is in a .xcassets directory and matches one of the know asset
+    # catalog type.
+    _xcassets_dir = "$target_gen_dir/${target_name}.xcassets"
+    _output_dir = "$_xcassets_dir/" +
+                  get_path_info(get_path_info(_sources[0], "dir"), "file")
+
+    foreach(_source, invoker.sources) {
+      _dir = get_path_info(_source, "dir")
+      _outputs += [ "$_output_dir/" + get_path_info(_source, "file") ]
+
+      assert(get_path_info(_dir, "extension") == invoker.asset_type,
+             "$_source dirname must have .${invoker.asset_type} extension")
+    }
+
+    action(_copy_target_name) {
+      # Forward "deps", "public_deps" and "testonly" in case some of the
+      # source files are generated.
+      forward_variables_from(invoker,
+                             [
+                               "deps",
+                               "public_deps",
+                               "testonly",
+                             ])
+
+      script = "//build/config/ios/hardlink.py"
+
+      visibility = [ ":$_data_target_name" ]
+      sources = _sources
+      outputs = _outputs + [ _xcassets_dir ]
+
+      args = [
+        rebase_path(get_path_info(_sources[0], "dir"), root_build_dir),
+        rebase_path(_output_dir, root_build_dir),
+      ]
+    }
+
+    bundle_data(_data_target_name) {
+      forward_variables_from(invoker,
+                             "*",
+                             [
+                               "deps",
+                               "outputs",
+                               "public_deps",
+                               "sources",
+                             ])
+
+      sources = _outputs
+      outputs = [ "{{bundle_resources_dir}}/{{source_file_part}}" ]
+      public_deps = [ ":$_copy_target_name" ]
+    }
+  }
+}
+
+# Those templates are specialisation of the asset_catalog template for known
+# types of asset catalog types (imageset, launchimage, appiconset).
+#
+# Arguments
+#
+#     sources:
+#       required, list of strings, paths to the file contained in the
+#       asset catalog directory; this must contain the Contents.json file
+#       and all the image referenced by it (not enforced by the template).
+#
+template("appiconset") {
+  asset_catalog(target_name) {
+    forward_variables_from(invoker, "*", [ "asset_type" ])
+    asset_type = "appiconset"
+  }
+}
+template("colorset") {
+  asset_catalog(target_name) {
+    forward_variables_from(invoker, "*", [ "asset_type" ])
+    asset_type = "colorset"
+  }
+}
+template("imageset") {
+  asset_catalog(target_name) {
+    forward_variables_from(invoker, "*", [ "asset_type" ])
+    asset_type = "imageset"
+  }
+}
+template("launchimage") {
+  asset_catalog(target_name) {
+    forward_variables_from(invoker, "*", [ "asset_type" ])
+    asset_type = "launchimage"
+  }
+}
diff --git a/third_party/libwebrtc/build/config/ios/codesign.py b/third_party/libwebrtc/build/config/ios/codesign.py
new file mode 100644
index 0000000000..15d25a78df
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/codesign.py
@@ -0,0 +1,691 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from __future__ import print_function
+
+import argparse
+import codecs
+import datetime
+import fnmatch
+import glob
+import json
+import os
+import plistlib
+import shutil
+import subprocess
+import sys
+import tempfile
+
+if sys.version_info.major < 3:
+  basestring_compat = basestring
+else:
+  basestring_compat = str
+
+
+def GetProvisioningProfilesDir():
+  """Returns the location of the installed mobile provisioning profiles.
+
+  Returns:
+    The path to the directory containing the installed mobile provisioning
+    profiles as a string.
+  """
+  return os.path.join(
+      os.environ['HOME'], 'Library', 'MobileDevice', 'Provisioning Profiles')
+
+
+def ReadPlistFromString(plist_bytes):
+  """Parse property list from given |plist_bytes|.
+
+    Args:
+      plist_bytes: contents of property list to load. Must be bytes in python 3.
+
+    Returns:
+      The contents of property list as a python object.
+    """
+  if sys.version_info.major == 2:
+    return plistlib.readPlistFromString(plist_bytes)
+  else:
+    return plistlib.loads(plist_bytes)
+
+
+def LoadPlistFile(plist_path):
+  """Loads property list file at |plist_path|.
+
+  Args:
+    plist_path: path to the property list file to load.
+
+  Returns:
+    The content of the property list file as a python object.
+  """
+  if sys.version_info.major == 2:
+    return plistlib.readPlistFromString(
+        subprocess.check_output(
+            ['xcrun', 'plutil', '-convert', 'xml1', '-o', '-', plist_path]))
+  else:
+    with open(plist_path, 'rb') as fp:
+      return plistlib.load(fp)
+
+
+def CreateSymlink(value, location):
+  """Creates symlink with value at location if the target exists."""
+  target = os.path.join(os.path.dirname(location), value)
+  if os.path.exists(location):
+    os.unlink(location)
+  os.symlink(value, location)
+
+
+class Bundle(object):
+  """Wraps a bundle."""
+
+  def __init__(self, bundle_path, platform):
+    """Initializes the Bundle object with data from bundle Info.plist file."""
+    self._path = bundle_path
+    self._kind = Bundle.Kind(platform, os.path.splitext(bundle_path)[-1])
+    self._data = None
+
+  def Load(self):
+    self._data = LoadPlistFile(self.info_plist_path)
+
+  @staticmethod
+  def Kind(platform, extension):
+    if platform == 'iphonesimulator' or platform == 'iphoneos':
+      return 'ios'
+    if platform == 'macosx':
+      if extension == '.framework':
+        return 'mac_framework'
+      return 'mac'
+    raise ValueError('unknown bundle type %s for %s' % (extension, platform))
+
+  @property
+  def kind(self):
+    return self._kind
+
+  @property
+  def path(self):
+    return self._path
+
+  @property
+  def contents_dir(self):
+    if self._kind == 'mac':
+      return os.path.join(self.path, 'Contents')
+    if self._kind == 'mac_framework':
+      return os.path.join(self.path, 'Versions/A')
+    return self.path
+
+  @property
+  def executable_dir(self):
+    if self._kind == 'mac':
+      return os.path.join(self.contents_dir, 'MacOS')
+    return self.contents_dir
+
+  @property
+  def resources_dir(self):
+    if self._kind == 'mac' or self._kind == 'mac_framework':
+      return os.path.join(self.contents_dir, 'Resources')
+    return self.path
+
+  @property
+  def info_plist_path(self):
+    if self._kind == 'mac_framework':
+      return os.path.join(self.resources_dir, 'Info.plist')
+    return os.path.join(self.contents_dir, 'Info.plist')
+
+  @property
+  def signature_dir(self):
+    return os.path.join(self.contents_dir, '_CodeSignature')
+
+  @property
+  def identifier(self):
+    return self._data['CFBundleIdentifier']
+
+  @property
+  def binary_name(self):
+    return self._data['CFBundleExecutable']
+
+  @property
+  def binary_path(self):
+    return os.path.join(self.executable_dir, self.binary_name)
+
+  def Validate(self, expected_mappings):
+    """Checks that keys in the bundle have the expected value.
+
+    Args:
+      expected_mappings: a dictionary of string to object, each mapping will
+      be looked up in the bundle data to check it has the same value (missing
+      values will be ignored)
+
+    Returns:
+      A dictionary of the key with a different value between expected_mappings
+      and the content of the bundle (i.e. errors) so that caller can format the
+      error message. The dictionary will be empty if there are no errors.
+    """
+    errors = {}
+    for key, expected_value in expected_mappings.items():
+      if key in self._data:
+        value = self._data[key]
+        if value != expected_value:
+          errors[key] = (value, expected_value)
+    return errors
+
+
+class ProvisioningProfile(object):
+  """Wraps a mobile provisioning profile file."""
+
+  def __init__(self, provisioning_profile_path):
+    """Initializes the ProvisioningProfile with data from profile file."""
+    self._path = provisioning_profile_path
+    self._data = ReadPlistFromString(
+        subprocess.check_output([
+            'xcrun', 'security', 'cms', '-D', '-u', 'certUsageAnyCA', '-i',
+            provisioning_profile_path
+        ]))
+
+  @property
+  def path(self):
+    return self._path
+
+  @property
+  def team_identifier(self):
+    return self._data.get('TeamIdentifier', [''])[0]
+
+  @property
+  def name(self):
+    return self._data.get('Name', '')
+
+  @property
+  def application_identifier_pattern(self):
+    return self._data.get('Entitlements', {}).get('application-identifier', '')
+
+  @property
+  def application_identifier_prefix(self):
+    return self._data.get('ApplicationIdentifierPrefix', [''])[0]
+
+  @property
+  def entitlements(self):
+    return self._data.get('Entitlements', {})
+
+  @property
+  def expiration_date(self):
+    return self._data.get('ExpirationDate', datetime.datetime.now())
+
+  def ValidToSignBundle(self, bundle_identifier):
+    """Checks whether the provisioning profile can sign bundle_identifier.
+
+    Args:
+      bundle_identifier: the identifier of the bundle that needs to be signed.
+
+    Returns:
+      True if the mobile provisioning profile can be used to sign a bundle
+      with the corresponding bundle_identifier, False otherwise.
+    """
+    return fnmatch.fnmatch(
+        '%s.%s' % (self.application_identifier_prefix, bundle_identifier),
+        self.application_identifier_pattern)
+
+  def Install(self, installation_path):
+    """Copies mobile provisioning profile info to |installation_path|."""
+    shutil.copy2(self.path, installation_path)
+
+
+class Entitlements(object):
+  """Wraps an Entitlement plist file."""
+
+  def __init__(self, entitlements_path):
+    """Initializes Entitlements object from entitlement file."""
+    self._path = entitlements_path
+    self._data = LoadPlistFile(self._path)
+
+  @property
+  def path(self):
+    return self._path
+
+  def ExpandVariables(self, substitutions):
+    self._data = self._ExpandVariables(self._data, substitutions)
+
+  def _ExpandVariables(self, data, substitutions):
+    if isinstance(data, basestring_compat):
+      for key, substitution in substitutions.items():
+        data = data.replace('$(%s)' % (key,), substitution)
+      return data
+
+    if isinstance(data, dict):
+      for key, value in data.items():
+        data[key] = self._ExpandVariables(value, substitutions)
+      return data
+
+    if isinstance(data, list):
+      for i, value in enumerate(data):
+        data[i] = self._ExpandVariables(value, substitutions)
+
+    return data
+
+  def LoadDefaults(self, defaults):
+    for key, value in defaults.items():
+      if key not in self._data:
+        self._data[key] = value
+
+  def WriteTo(self, target_path):
+    with open(target_path, 'wb') as fp:
+      if sys.version_info.major == 2:
+        plistlib.writePlist(self._data, fp)
+      else:
+        plistlib.dump(self._data, fp)
+
+
+def FindProvisioningProfile(bundle_identifier, required):
+  """Finds mobile provisioning profile to use to sign bundle.
+
+  Args:
+    bundle_identifier: the identifier of the bundle to sign.
+
+  Returns:
+    The ProvisioningProfile object that can be used to sign the Bundle
+    object or None if no matching provisioning profile was found.
+  """
+  provisioning_profile_paths = glob.glob(
+      os.path.join(GetProvisioningProfilesDir(), '*.mobileprovision'))
+
+  # Iterate over all installed mobile provisioning profiles and filter those
+  # that can be used to sign the bundle, ignoring expired ones.
+  now = datetime.datetime.now()
+  valid_provisioning_profiles = []
+  one_hour = datetime.timedelta(0, 3600)
+  for provisioning_profile_path in provisioning_profile_paths:
+    provisioning_profile = ProvisioningProfile(provisioning_profile_path)
+    if provisioning_profile.expiration_date - now < one_hour:
+      sys.stderr.write(
+          'Warning: ignoring expired provisioning profile: %s.\n' %
+          provisioning_profile_path)
+      continue
+    if provisioning_profile.ValidToSignBundle(bundle_identifier):
+      valid_provisioning_profiles.append(provisioning_profile)
+
+  if not valid_provisioning_profiles:
+    if required:
+      sys.stderr.write(
+          'Error: no mobile provisioning profile found for "%s".\n' %
+          bundle_identifier)
+      sys.exit(1)
+    return None
+
+  # Select the most specific mobile provisioning profile, i.e. the one with
+  # the longest application identifier pattern (prefer the one with the latest
+  # expiration date as a secondary criteria).
+  selected_provisioning_profile = max(
+      valid_provisioning_profiles,
+      key=lambda p: (len(p.application_identifier_pattern), p.expiration_date))
+
+  one_week = datetime.timedelta(7)
+  if selected_provisioning_profile.expiration_date - now < 2 * one_week:
+    sys.stderr.write(
+        'Warning: selected provisioning profile will expire soon: %s' %
+        selected_provisioning_profile.path)
+  return selected_provisioning_profile
+
+
+def CodeSignBundle(bundle_path, identity, extra_args):
+  process = subprocess.Popen(
+      ['xcrun', 'codesign', '--force', '--sign', identity, '--timestamp=none'] +
+      list(extra_args) + [bundle_path],
+      stderr=subprocess.PIPE,
+      universal_newlines=True)
+  _, stderr = process.communicate()
+  if process.returncode:
+    sys.stderr.write(stderr)
+    sys.exit(process.returncode)
+  for line in stderr.splitlines():
+    if line.endswith(': replacing existing signature'):
+      # Ignore warning about replacing existing signature as this should only
+      # happen when re-signing system frameworks (and then it is expected).
+      continue
+    sys.stderr.write(line)
+    sys.stderr.write('\n')
+
+
+def InstallSystemFramework(framework_path, bundle_path, args):
+  """Install framework from |framework_path| to |bundle| and code-re-sign it."""
+  installed_framework_path = os.path.join(
+      bundle_path, 'Frameworks', os.path.basename(framework_path))
+
+  if os.path.isfile(framework_path):
+    shutil.copy(framework_path, installed_framework_path)
+  elif os.path.isdir(framework_path):
+    if os.path.exists(installed_framework_path):
+      shutil.rmtree(installed_framework_path)
+    shutil.copytree(framework_path, installed_framework_path)
+
+  CodeSignBundle(installed_framework_path, args.identity,
+      ['--deep', '--preserve-metadata=identifier,entitlements,flags'])
+
+
+def GenerateEntitlements(path, provisioning_profile, bundle_identifier):
+  """Generates an entitlements file.
+
+  Args:
+    path: path to the entitlements template file
+    provisioning_profile: ProvisioningProfile object to use, may be None
+    bundle_identifier: identifier of the bundle to sign.
+  """
+  entitlements = Entitlements(path)
+  if provisioning_profile:
+    entitlements.LoadDefaults(provisioning_profile.entitlements)
+    app_identifier_prefix = \
+      provisioning_profile.application_identifier_prefix + '.'
+  else:
+    app_identifier_prefix = '*.'
+  entitlements.ExpandVariables({
+      'CFBundleIdentifier': bundle_identifier,
+      'AppIdentifierPrefix': app_identifier_prefix,
+  })
+  return entitlements
+
+
+def GenerateBundleInfoPlist(bundle, plist_compiler, partial_plist):
+  """Generates the bundle Info.plist for a list of partial .plist files.
+
+  Args:
+    bundle: a Bundle instance
+    plist_compiler: string, path to the Info.plist compiler
+    partial_plist: list of path to partial .plist files to merge
+  """
+
+  # Filter empty partial .plist files (this happens if an application
+  # does not compile any asset catalog, in which case the partial .plist
+  # file from the asset catalog compilation step is just a stamp file).
+  filtered_partial_plist = []
+  for plist in partial_plist:
+    plist_size = os.stat(plist).st_size
+    if plist_size:
+      filtered_partial_plist.append(plist)
+
+  # Invoke the plist_compiler script. It needs to be a python script.
+  subprocess.check_call([
+      'python',
+      plist_compiler,
+      'merge',
+      '-f',
+      'binary1',
+      '-o',
+      bundle.info_plist_path,
+  ] + filtered_partial_plist)
+
+
+class Action(object):
+  """Class implementing one action supported by the script."""
+
+  @classmethod
+  def Register(cls, subparsers):
+    parser = subparsers.add_parser(cls.name, help=cls.help)
+    parser.set_defaults(func=cls._Execute)
+    cls._Register(parser)
+
+
+class CodeSignBundleAction(Action):
+  """Class implementing the code-sign-bundle action."""
+
+  name = 'code-sign-bundle'
+  help = 'perform code signature for a bundle'
+
+  @staticmethod
+  def _Register(parser):
+    parser.add_argument(
+        '--entitlements', '-e', dest='entitlements_path',
+        help='path to the entitlements file to use')
+    parser.add_argument(
+        'path', help='path to the iOS bundle to codesign')
+    parser.add_argument(
+        '--identity', '-i', required=True,
+        help='identity to use to codesign')
+    parser.add_argument(
+        '--binary', '-b', required=True,
+        help='path to the iOS bundle binary')
+    parser.add_argument(
+        '--framework', '-F', action='append', default=[], dest='frameworks',
+        help='install and resign system framework')
+    parser.add_argument(
+        '--disable-code-signature', action='store_true', dest='no_signature',
+        help='disable code signature')
+    parser.add_argument(
+        '--disable-embedded-mobileprovision', action='store_false',
+        default=True, dest='embedded_mobileprovision',
+        help='disable finding and embedding mobileprovision')
+    parser.add_argument(
+        '--platform', '-t', required=True,
+        help='platform the signed bundle is targeting')
+    parser.add_argument(
+        '--partial-info-plist', '-p', action='append', default=[],
+        help='path to partial Info.plist to merge to create bundle Info.plist')
+    parser.add_argument(
+        '--plist-compiler-path', '-P', action='store',
+        help='path to the plist compiler script (for --partial-info-plist)')
+    parser.set_defaults(no_signature=False)
+
+  @staticmethod
+  def _Execute(args):
+    if not args.identity:
+      args.identity = '-'
+
+    bundle = Bundle(args.path, args.platform)
+
+    if args.partial_info_plist:
+      GenerateBundleInfoPlist(bundle, args.plist_compiler_path,
+                              args.partial_info_plist)
+
+    # The bundle Info.plist may have been updated by GenerateBundleInfoPlist()
+    # above. Load the bundle information from Info.plist after the modification
+    # have been written to disk.
+    bundle.Load()
+
+    # According to Apple documentation, the application binary must be the same
+    # as the bundle name without the .app suffix. See crbug.com/740476 for more
+    # information on what problem this can cause.
+    #
+    # To prevent this class of error, fail with an error if the binary name is
+    # incorrect in the Info.plist as it is not possible to update the value in
+    # Info.plist at this point (the file has been copied by a different target
+    # and ninja would consider the build dirty if it was updated).
+    #
+    # Also checks that the name of the bundle is correct too (does not cause the
+    # build to be considered dirty, but still terminate the script in case of an
+    # incorrect bundle name).
+    #
+    # Apple documentation is available at:
+    # https://developer.apple.com/library/content/documentation/CoreFoundation/Conceptual/CFBundles/BundleTypes/BundleTypes.html
+    bundle_name = os.path.splitext(os.path.basename(bundle.path))[0]
+    errors = bundle.Validate({
+        'CFBundleName': bundle_name,
+        'CFBundleExecutable': bundle_name,
+    })
+    if errors:
+      for key in sorted(errors):
+        value, expected_value = errors[key]
+        sys.stderr.write('%s: error: %s value incorrect: %s != %s\n' % (
+            bundle.path, key, value, expected_value))
+      sys.stderr.flush()
+      sys.exit(1)
+
+    # Delete existing embedded mobile provisioning.
+    embedded_provisioning_profile = os.path.join(
+        bundle.path, 'embedded.mobileprovision')
+    if os.path.isfile(embedded_provisioning_profile):
+      os.unlink(embedded_provisioning_profile)
+
+    # Delete existing code signature.
+    if os.path.exists(bundle.signature_dir):
+      shutil.rmtree(bundle.signature_dir)
+
+    # Install system frameworks if requested.
+    for framework_path in args.frameworks:
+      InstallSystemFramework(framework_path, args.path, args)
+
+    # Copy main binary into bundle.
+    if not os.path.isdir(bundle.executable_dir):
+      os.makedirs(bundle.executable_dir)
+    shutil.copy(args.binary, bundle.binary_path)
+
+    if bundle.kind == 'mac_framework':
+      # Create Versions/Current -> Versions/A symlink
+      CreateSymlink('A', os.path.join(bundle.path, 'Versions/Current'))
+
+      # Create $binary_name -> Versions/Current/$binary_name symlink
+      CreateSymlink(os.path.join('Versions/Current', bundle.binary_name),
+                    os.path.join(bundle.path, bundle.binary_name))
+
+      # Create optional symlinks.
+      for name in ('Headers', 'Resources', 'Modules'):
+        target = os.path.join(bundle.path, 'Versions/A', name)
+        if os.path.exists(target):
+          CreateSymlink(os.path.join('Versions/Current', name),
+                        os.path.join(bundle.path, name))
+        else:
+          obsolete_path = os.path.join(bundle.path, name)
+          if os.path.exists(obsolete_path):
+            os.unlink(obsolete_path)
+
+    if args.no_signature:
+      return
+
+    codesign_extra_args = []
+
+    if args.embedded_mobileprovision:
+      # Find mobile provisioning profile and embeds it into the bundle (if a
+      # code signing identify has been provided, fails if no valid mobile
+      # provisioning is found).
+      provisioning_profile_required = args.identity != '-'
+      provisioning_profile = FindProvisioningProfile(
+          bundle.identifier, provisioning_profile_required)
+      if provisioning_profile and args.platform != 'iphonesimulator':
+        provisioning_profile.Install(embedded_provisioning_profile)
+
+        if args.entitlements_path is not None:
+          temporary_entitlements_file = \
+              tempfile.NamedTemporaryFile(suffix='.xcent')
+          codesign_extra_args.extend(
+              ['--entitlements', temporary_entitlements_file.name])
+
+          entitlements = GenerateEntitlements(
+              args.entitlements_path, provisioning_profile, bundle.identifier)
+          entitlements.WriteTo(temporary_entitlements_file.name)
+
+    CodeSignBundle(bundle.path, args.identity, codesign_extra_args)
+
+
+class CodeSignFileAction(Action):
+  """Class implementing code signature for a single file."""
+
+  name = 'code-sign-file'
+  help = 'code-sign a single file'
+
+  @staticmethod
+  def _Register(parser):
+    parser.add_argument(
+        'path', help='path to the file to codesign')
+    parser.add_argument(
+        '--identity', '-i', required=True,
+        help='identity to use to codesign')
+    parser.add_argument(
+        '--output', '-o',
+        help='if specified copy the file to that location before signing it')
+    parser.set_defaults(sign=True)
+
+  @staticmethod
+  def _Execute(args):
+    if not args.identity:
+      args.identity = '-'
+
+    install_path = args.path
+    if args.output:
+
+      if os.path.isfile(args.output):
+        os.unlink(args.output)
+      elif os.path.isdir(args.output):
+        shutil.rmtree(args.output)
+
+      if os.path.isfile(args.path):
+        shutil.copy(args.path, args.output)
+      elif os.path.isdir(args.path):
+        shutil.copytree(args.path, args.output)
+
+      install_path = args.output
+
+    CodeSignBundle(install_path, args.identity,
+      ['--deep', '--preserve-metadata=identifier,entitlements'])
+
+
+class GenerateEntitlementsAction(Action):
+  """Class implementing the generate-entitlements action."""
+
+  name = 'generate-entitlements'
+  help = 'generate entitlements file'
+
+  @staticmethod
+  def _Register(parser):
+    parser.add_argument(
+        '--entitlements', '-e', dest='entitlements_path',
+        help='path to the entitlements file to use')
+    parser.add_argument(
+        'path', help='path to the entitlements file to generate')
+    parser.add_argument(
+        '--info-plist', '-p', required=True,
+        help='path to the bundle Info.plist')
+
+  @staticmethod
+  def _Execute(args):
+    info_plist = LoadPlistFile(args.info_plist)
+    bundle_identifier = info_plist['CFBundleIdentifier']
+    provisioning_profile = FindProvisioningProfile(bundle_identifier, False)
+    entitlements = GenerateEntitlements(
+        args.entitlements_path, provisioning_profile, bundle_identifier)
+    entitlements.WriteTo(args.path)
+
+
+class FindProvisioningProfileAction(Action):
+  """Class implementing the find-codesign-identity action."""
+
+  name = 'find-provisioning-profile'
+  help = 'find provisioning profile for use by Xcode project generator'
+
+  @staticmethod
+  def _Register(parser):
+    parser.add_argument('--bundle-id',
+                        '-b',
+                        required=True,
+                        help='bundle identifier')
+
+  @staticmethod
+  def _Execute(args):
+    provisioning_profile_info = {}
+    provisioning_profile = FindProvisioningProfile(args.bundle_id, False)
+    for key in ('team_identifier', 'name'):
+      if provisioning_profile:
+        provisioning_profile_info[key] = getattr(provisioning_profile, key)
+      else:
+        provisioning_profile_info[key] = ''
+    print(json.dumps(provisioning_profile_info))
+
+
+def Main():
+  # Cache this codec so that plistlib can find it. See
+  # https://crbug.com/999461#c12 for more details.
+  codecs.lookup('utf-8')
+
+  parser = argparse.ArgumentParser('codesign iOS bundles')
+  subparsers = parser.add_subparsers()
+
+  actions = [
+      CodeSignBundleAction,
+      CodeSignFileAction,
+      GenerateEntitlementsAction,
+      FindProvisioningProfileAction,
+  ]
+
+  for action in actions:
+    action.Register(subparsers)
+
+  args = parser.parse_args()
+  args.func(args)
+
+
+if __name__ == '__main__':
+  sys.exit(Main())
diff --git a/third_party/libwebrtc/build/config/ios/compile_ib_files.py b/third_party/libwebrtc/build/config/ios/compile_ib_files.py
new file mode 100644
index 0000000000..84781c1773
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/compile_ib_files.py
@@ -0,0 +1,57 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from __future__ import print_function
+
+import argparse
+import logging
+import os
+import re
+import subprocess
+import sys
+
+
+def main():
+  parser = argparse.ArgumentParser(
+      description='A script to compile xib and storyboard.',
+      fromfile_prefix_chars='@')
+  parser.add_argument('-o', '--output', required=True,
+                      help='Path to output bundle.')
+  parser.add_argument('-i', '--input', required=True,
+                      help='Path to input xib or storyboard.')
+  args, unknown_args = parser.parse_known_args()
+
+  ibtool_args = [
+      'xcrun', 'ibtool',
+      '--errors', '--warnings', '--notices',
+      '--output-format', 'human-readable-text'
+  ]
+  ibtool_args += unknown_args
+  ibtool_args += [
+      '--compile',
+      os.path.abspath(args.output),
+      os.path.abspath(args.input)
+  ]
+
+  ibtool_section_re = re.compile(r'/\*.*\*/')
+  ibtool_re = re.compile(r'.*note:.*is clipping its content')
+  try:
+    stdout = subprocess.check_output(ibtool_args)
+  except subprocess.CalledProcessError as e:
+    print(e.output)
+    raise
+  current_section_header = None
+  for line in stdout.splitlines():
+    if ibtool_section_re.match(line):
+      current_section_header = line
+    elif not ibtool_re.match(line):
+      if current_section_header:
+        print(current_section_header)
+        current_section_header = None
+      print(line)
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())
diff --git a/third_party/libwebrtc/build/config/ios/compile_xcassets_unittests.py b/third_party/libwebrtc/build/config/ios/compile_xcassets_unittests.py
new file mode 100644
index 0000000000..7655df8c05
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/compile_xcassets_unittests.py
@@ -0,0 +1,141 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import unittest
+import compile_xcassets
+
+
+class TestFilterCompilerOutput(unittest.TestCase):
+
+  relative_paths = {
+    '/Users/janedoe/chromium/src/Chromium.xcassets':
+        '../../Chromium.xcassets',
+    '/Users/janedoe/chromium/src/out/Default/Chromium.app/Assets.car':
+        'Chromium.app/Assets.car',
+  }
+
+  def testNoError(self):
+    self.assertEquals(
+        '',
+        compile_xcassets.FilterCompilerOutput(
+            '/* com.apple.actool.compilation-results */\n'
+            '/Users/janedoe/chromium/src/out/Default/Chromium.app/Assets.car\n',
+            self.relative_paths))
+
+  def testNoErrorRandomMessages(self):
+    self.assertEquals(
+        '',
+        compile_xcassets.FilterCompilerOutput(
+            '2017-07-04 04:59:19.460 ibtoold[23487:41214] CoreSimulator is att'
+                'empting to unload a stale CoreSimulatorService job.  Existing'
+                ' job (com.apple.CoreSimulator.CoreSimulatorService.179.1.E8tt'
+                'yeDeVgWK) is from an older version and is being removed to pr'
+                'event problems.\n'
+            '/* com.apple.actool.compilation-results */\n'
+            '/Users/janedoe/chromium/src/out/Default/Chromium.app/Assets.car\n',
+            self.relative_paths))
+
+  def testWarning(self):
+    self.assertEquals(
+        '/* com.apple.actool.document.warnings */\n'
+        '../../Chromium.xcassets:./image1.imageset/[universal][][][1x][][][]['
+            '][][]: warning: The file "image1.png" for the image set "image1"'
+            ' does not exist.\n',
+        compile_xcassets.FilterCompilerOutput(
+            '/* com.apple.actool.document.warnings */\n'
+            '/Users/janedoe/chromium/src/Chromium.xcassets:./image1.imageset/['
+                'universal][][][1x][][][][][][]: warning: The file "image1.png'
+                '" for the image set "image1" does not exist.\n'
+            '/* com.apple.actool.compilation-results */\n'
+            '/Users/janedoe/chromium/src/out/Default/Chromium.app/Assets.car\n',
+            self.relative_paths))
+
+  def testError(self):
+    self.assertEquals(
+        '/* com.apple.actool.errors */\n'
+        '../../Chromium.xcassets: error: The output directory "/Users/janedoe/'
+            'chromium/src/out/Default/Chromium.app" does not exist.\n',
+        compile_xcassets.FilterCompilerOutput(
+            '/* com.apple.actool.errors */\n'
+            '/Users/janedoe/chromium/src/Chromium.xcassets: error: The output '
+                'directory "/Users/janedoe/chromium/src/out/Default/Chromium.a'
+                'pp" does not exist.\n'
+            '/* com.apple.actool.compilation-results */\n',
+            self.relative_paths))
+
+  def testSpurious(self):
+    self.assertEquals(
+        '/* com.apple.actool.document.warnings */\n'
+        '../../Chromium.xcassets:./AppIcon.appiconset: warning: A 1024x1024 ap'
+            'p store icon is required for iOS apps\n',
+        compile_xcassets.FilterCompilerOutput(
+            '/* com.apple.actool.document.warnings */\n'
+            '/Users/janedoe/chromium/src/Chromium.xcassets:./AppIcon.appiconse'
+                't: warning: A 1024x1024 app store icon is required for iOS ap'
+                'ps\n'
+            '/* com.apple.actool.document.notices */\n'
+            '/Users/janedoe/chromium/src/Chromium.xcassets:./AppIcon.appiconse'
+                't/[][ipad][76x76][][][1x][][]: notice: (null)\n',
+            self.relative_paths))
+
+  def testComplexError(self):
+    self.assertEquals(
+        '/* com.apple.actool.errors */\n'
+        ': error: Failed to find a suitable device for the type SimDeviceType '
+            ': com.apple.dt.Xcode.IBSimDeviceType.iPad-2x with runtime SimRunt'
+            'ime : 10.3.1 (14E8301) - com.apple.CoreSimulator.SimRuntime.iOS-1'
+            '0-3\n'
+        '    Failure Reason: Failed to create SimDeviceSet at path /Users/jane'
+            'doe/Library/Developer/Xcode/UserData/IB Support/Simulator Devices'
+            '. You\'ll want to check the logs in ~/Library/Logs/CoreSimulator '
+            'to see why creating the SimDeviceSet failed.\n'
+        '    Underlying Errors:\n'
+        '        Description: Failed to initialize simulator device set.\n'
+        '        Failure Reason: Failed to subscribe to notifications from Cor'
+            'eSimulatorService.\n'
+        '        Underlying Errors:\n'
+        '            Description: Error returned in reply to notification requ'
+            'est: Connection invalid\n'
+        '            Failure Reason: Software caused connection abort\n',
+        compile_xcassets.FilterCompilerOutput(
+            '2017-07-07 10:37:27.367 ibtoold[88538:12553239] CoreSimulator det'
+                'ected Xcode.app relocation or CoreSimulatorService version ch'
+                'ange.  Framework path (/Applications/Xcode.app/Contents/Devel'
+                'oper/Library/PrivateFrameworks/CoreSimulator.framework) and v'
+                'ersion (375.21) does not match existing job path (/Library/De'
+                'veloper/PrivateFrameworks/CoreSimulator.framework/Versions/A/'
+                'XPCServices/com.apple.CoreSimulator.CoreSimulatorService.xpc)'
+                ' and version (459.13).  Attempting to remove the stale servic'
+                'e in order to add the expected version.\n'
+            '2017-07-07 10:37:27.625 ibtoold[88538:12553256] CoreSimulatorServ'
+                'ice connection interrupted.  Resubscribing to notifications.\n'
+            '2017-07-07 10:37:27.632 ibtoold[88538:12553264] CoreSimulatorServ'
+                'ice connection became invalid.  Simulator services will no lo'
+                'nger be available.\n'
+            '2017-07-07 10:37:27.642 ibtoold[88538:12553274] CoreSimulatorServ'
+                'ice connection became invalid.  Simulator services will no lo'
+                'nger be available.\n'
+            '/* com.apple.actool.errors */\n'
+            ': error: Failed to find a suitable device for the type SimDeviceT'
+                'ype : com.apple.dt.Xcode.IBSimDeviceType.iPad-2x with runtime'
+                ' SimRuntime : 10.3.1 (14E8301) - com.apple.CoreSimulator.SimR'
+                'untime.iOS-10-3\n'
+            '    Failure Reason: Failed to create SimDeviceSet at path /Users/'
+                'janedoe/Library/Developer/Xcode/UserData/IB Support/Simulator'
+                ' Devices. You\'ll want to check the logs in ~/Library/Logs/Co'
+                'reSimulator to see why creating the SimDeviceSet failed.\n'
+            '    Underlying Errors:\n'
+            '        Description: Failed to initialize simulator device set.\n'
+            '        Failure Reason: Failed to subscribe to notifications from'
+                ' CoreSimulatorService.\n'
+            '        Underlying Errors:\n'
+            '            Description: Error returned in reply to notification '
+                'request: Connection invalid\n'
+            '            Failure Reason: Software caused connection abort\n'
+            '/* com.apple.actool.compilation-results */\n',
+            self.relative_paths))
+
+
+if __name__ == '__main__':
+  unittest.main()
diff --git a/third_party/libwebrtc/build/config/ios/config.gni b/third_party/libwebrtc/build/config/ios/config.gni
new file mode 100644
index 0000000000..358c7ccd2a
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/config.gni
@@ -0,0 +1,28 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  # Configure the environment for which to build. Could be either "device",
+  # "simulator" or "catalyst". If unspecified, then it will be assumed to be
+  # "simulator" if the target_cpu is "x68" or "x64", "device" otherwise. The
+  # default is only there for compatibility reasons and will be removed (see
+  # crbug.com/1138425 for more details).
+  target_environment = ""
+
+  # Control whether cronet is built (this is usually set by the script
+  # components/cronet/tools/cr_cronet.py as cronet requires specific
+  # gn args to build correctly).
+  is_cronet_build = false
+}
+
+if (target_environment == "") {
+  if (target_cpu == "x86" || target_cpu == "x64") {
+    target_environment = "simulator"
+  } else {
+    target_environment = "device"
+  }
+}
+
+assert(target_environment == "simulator" || target_environment == "device" ||
+       target_environment == "catalyst")
diff --git a/third_party/libwebrtc/build/config/ios/dummy.py b/third_party/libwebrtc/build/config/ios/dummy.py
new file mode 100644
index 0000000000..b23b7dab96
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/dummy.py
@@ -0,0 +1,15 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Empty script that does nothing and return success error code.
+
+This script is used by some gn targets that pretend creating some output
+but instead depend on another target creating the output indirectly (in
+general this output is a directory that is used as input by a bundle_data
+target).
+
+It ignores all parameters and terminate with a success error code. It
+does the same thing as the unix command "true", but gn can only invoke
+python scripts.
+"""
diff --git a/third_party/libwebrtc/build/config/ios/entitlements.plist b/third_party/libwebrtc/build/config/ios/entitlements.plist
new file mode 100644
index 0000000000..429762e3a3
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/entitlements.plist
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>application-identifier</key>
+	<string>$(AppIdentifierPrefix)$(CFBundleIdentifier)</string>
+	<key>keychain-access-groups</key>
+	<array>
+		<string>$(AppIdentifierPrefix)$(CFBundleIdentifier)</string>
+	</array>
+</dict>
+</plist>
diff --git a/third_party/libwebrtc/build/config/ios/find_signing_identity.py b/third_party/libwebrtc/build/config/ios/find_signing_identity.py
new file mode 100644
index 0000000000..d508e2bb46
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/find_signing_identity.py
@@ -0,0 +1,89 @@
+# Copyright (c) 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from __future__ import print_function
+
+import argparse
+import os
+import subprocess
+import sys
+import re
+
+
+def Redact(value, from_nth_char=5):
+  """Redact value past the N-th character."""
+  return value[:from_nth_char] + '*' * (len(value) - from_nth_char)
+
+
+class Identity(object):
+  """Represents a valid identity."""
+
+  def __init__(self, identifier, name, team):
+    self.identifier = identifier
+    self.name = name
+    self.team = team
+
+  def redacted(self):
+    return Identity(Redact(self.identifier), self.name, Redact(self.team))
+
+  def format(self):
+    return '%s: "%s (%s)"' % (self.identifier, self.name, self.team)
+
+
+def ListIdentities():
+  return subprocess.check_output([
+      'xcrun',
+      'security',
+      'find-identity',
+      '-v',
+      '-p',
+      'codesigning',
+  ]).decode('utf8')
+
+
+def FindValidIdentity(pattern):
+  """Find all identities matching the pattern."""
+  lines = list(l.strip() for l in ListIdentities().splitlines())
+  # Look for something like "2) XYZ "iPhone Developer: Name (ABC)""
+  regex = re.compile('[0-9]+\) ([A-F0-9]+) "([^"(]*) \(([^)"]*)\)"')
+
+  result = []
+  for line in lines:
+    res = regex.match(line)
+    if res is None:
+      continue
+    if pattern is None or pattern in res.group(2):
+      result.append(Identity(*res.groups()))
+  return result
+
+
+def Main(args):
+  parser = argparse.ArgumentParser('codesign iOS bundles')
+  parser.add_argument('--matching-pattern',
+                      dest='pattern',
+                      help='Pattern used to select the code signing identity.')
+  parsed = parser.parse_args(args)
+
+  identities = FindValidIdentity(parsed.pattern)
+  if len(identities) == 1:
+    print(identities[0].identifier, end='')
+    return 0
+
+  all_identities = FindValidIdentity(None)
+
+  print('Automatic code signing identity selection was enabled but could not')
+  print('find exactly one codesigning identity matching "%s".' % parsed.pattern)
+  print('')
+  print('Check that the keychain is accessible and that there is exactly one')
+  print('valid codesigning identity matching the pattern. Here is the parsed')
+  print('output of `xcrun security find-identity -v -p codesigning`:')
+  print()
+  for i, identity in enumerate(all_identities):
+    print('  %d) %s' % (i + 1, identity.redacted().format()))
+  print('    %d valid identities found' % (len(all_identities)))
+  return 1
+
+
+if __name__ == '__main__':
+  sys.exit(Main(sys.argv[1:]))
diff --git a/third_party/libwebrtc/build/config/ios/generate_umbrella_header.py b/third_party/libwebrtc/build/config/ios/generate_umbrella_header.py
new file mode 100644
index 0000000000..8547e18aa7
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/generate_umbrella_header.py
@@ -0,0 +1,75 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Generates an umbrella header for an iOS framework."""
+
+import argparse
+import datetime
+import os
+import re
+import string
+
+
+HEADER_TEMPLATE = string.Template('''\
+// Copyright $year The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// This file is auto-generated by //build/ios/config/generate_umbrella_header.py
+
+#ifndef $header_guard
+#define $header_guard
+
+$imports
+
+#endif  // $header_guard
+''')
+
+
+def ComputeHeaderGuard(file_path):
+  """Computes the header guard for a file path.
+
+  Args:
+    file_path: The path to convert into an header guard.
+  Returns:
+    The header guard string for the file_path.
+  """
+  return re.sub(r'[.+/\\]', r'_', file_path.upper()) + '_'
+
+
+def WriteUmbrellaHeader(output_path, imported_headers):
+  """Writes the umbrella header.
+
+  Args:
+    output_path: The path to the umbrella header.
+    imported_headers: A list of headers to #import in the umbrella header.
+  """
+  year = datetime.date.today().year
+  header_guard = ComputeHeaderGuard(output_path)
+  imports = '\n'.join([
+      '#import "%s"' % os.path.basename(header)
+          for header in sorted(imported_headers)
+      ])
+  with open(output_path, 'w') as output_file:
+    output_file.write(
+        HEADER_TEMPLATE.safe_substitute({
+            'year': year,
+            'header_guard': header_guard,
+            'imports': imports,
+        }))
+
+
+def Main():
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.add_argument('--output-path', required=True, type=str,
+                      help='Path to the generated umbrella header.')
+  parser.add_argument('imported_headers', type=str, nargs='+',
+                      help='Headers to #import in the umbrella header.')
+  options = parser.parse_args()
+
+  return WriteUmbrellaHeader(options.output_path, options.imported_headers)
+
+
+if __name__ == '__main__':
+  Main()
diff --git a/third_party/libwebrtc/build/config/ios/hardlink.py b/third_party/libwebrtc/build/config/ios/hardlink.py
new file mode 100644
index 0000000000..38f60d4013
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/hardlink.py
@@ -0,0 +1,71 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Recursively create hardlink to target named output."""
+
+
+import argparse
+import os
+import shutil
+
+
+def CreateHardlinkHelper(target, output):
+  """Recursively create a hardlink named output pointing to target.
+
+  Args:
+    target: path to an existing file or directory
+    output: path to the newly created hardlink
+
+  This function assumes that output does not exists but that the parent
+  directory containing output does. If those conditions are false, then
+  the function will fails with an exception corresponding to an OS error.
+  """
+  if os.path.islink(target):
+    os.symlink(os.readlink(target), output)
+  elif not os.path.isdir(target):
+    try:
+      os.link(target, output)
+    except:
+      shutil.copy(target, output)
+  else:
+    os.mkdir(output)
+    for name in os.listdir(target):
+      CreateHardlinkHelper(
+          os.path.join(target, name),
+          os.path.join(output, name))
+
+
+def CreateHardlink(target, output):
+  """Recursively create a hardlink named output pointing to target.
+
+  Args:
+    target: path to an existing file or directory
+    output: path to the newly created hardlink
+
+  If output already exists, it is first removed. In all cases, the
+  parent directory containing output is created.
+  """
+  if os.path.isdir(output):
+    shutil.rmtree(output)
+  elif os.path.exists(output):
+    os.unlink(output)
+
+  parent_dir = os.path.dirname(os.path.abspath(output))
+  if not os.path.isdir(parent_dir):
+    os.makedirs(parent_dir)
+
+  CreateHardlinkHelper(target, output)
+
+
+def Main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument('target', help='path to the file or directory to link to')
+  parser.add_argument('output', help='name of the hardlink to create')
+  args = parser.parse_args()
+
+  CreateHardlink(args.target, args.output)
+
+
+if __name__ == '__main__':
+  Main()
diff --git a/third_party/libwebrtc/build/config/ios/ios_sdk.gni b/third_party/libwebrtc/build/config/ios/ios_sdk.gni
new file mode 100644
index 0000000000..ffff5921d8
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/ios_sdk.gni
@@ -0,0 +1,185 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/ios/config.gni")
+import("//build/config/ios/ios_sdk_overrides.gni")
+import("//build/toolchain/goma.gni")
+import("//build/toolchain/goma.gni")
+import("//build/toolchain/toolchain.gni")
+import("//build_overrides/build.gni")
+
+assert(current_os == "ios")
+assert(use_system_xcode, "Hermetic xcode doesn't work for ios.")
+
+declare_args() {
+  # SDK path to use. When empty this will use the default SDK based on the
+  # value of target_environment.
+  ios_bin_path = ""
+  ios_sdk_path = ""
+  ios_sdk_name = ""
+  ios_sdk_version = ""
+  ios_sdk_platform = ""
+  ios_sdk_platform_path = ""
+  ios_toolchains_path = ""
+  xcode_version = ""
+  xcode_version_int = 0
+  xcode_build = ""
+  machine_os_build = ""
+
+  # Set DEVELOPER_DIR while running sdk_info.py.
+  ios_sdk_developer_dir = ""
+
+  # Control whether codesiging is enabled (ignored for simulator builds).
+  ios_enable_code_signing = true
+
+  # Explicitly select the identity to use for codesigning. If defined, must
+  # be set to a non-empty string that will be passed to codesigning. Can be
+  # left unspecified if ios_code_signing_identity_description is used instead.
+  ios_code_signing_identity = ""
+
+  # Pattern used to select the identity to use for codesigning. If defined,
+  # must be a substring of the description of exactly one of the identities by
+  # `security find-identity -v -p codesigning`.
+  ios_code_signing_identity_description = "Apple Development"
+
+  # Prefix for CFBundleIdentifier property of iOS bundles (correspond to the
+  # "Organization Identifier" in Xcode). Code signing will fail if no mobile
+  # provisioning for the selected code signing identify support that prefix.
+  ios_app_bundle_id_prefix = "org.chromium"
+
+  # If non-empty, this list must contain valid cpu architecture, and the final
+  # build will be a multi-architecture build (aka fat build) supporting the
+  # main $target_cpu architecture and all of $additional_target_cpus.
+  #
+  # For example to build an application that will run on both arm64 and armv7
+  # devices, you would use the following in args.gn file when running "gn args":
+  #
+  #   target_os = "ios"
+  #   target_cpu = "arm64"
+  #   additional_target_cpus = [ "arm" ]
+  #
+  # You can also pass the value via "--args" parameter for "gn gen" command by
+  # using the syntax --args='additional_target_cpus=["arm"] target_cpu="arm64"'.
+  additional_target_cpus = []
+}
+
+declare_args() {
+  # This variable is set by the toolchain. It is set to true if the toolchain
+  # is a secondary toolchain as part of a "fat" build.
+  is_fat_secondary_toolchain = false
+
+  # This variable is set by the toolchain. It is the name of the primary
+  # toolchain for the fat build (could be current_toolchain).
+  primary_fat_toolchain_name = ""
+}
+
+# Official builds may not use goma.
+assert(!(use_goma && is_chrome_branded && is_official_build &&
+             target_cpu == "arm64"),
+       "goma use is forbidden for official iOS builds.")
+
+assert(custom_toolchain == "" || additional_target_cpus == [],
+       "cannot define both custom_toolchain and additional_target_cpus")
+
+# If codesigning is enabled, use must configure either a codesigning identity
+# or a filter to automatically select the codesigning identity.
+if (target_environment == "device" && ios_enable_code_signing) {
+  assert(ios_code_signing_identity == "" ||
+             ios_code_signing_identity_description == "",
+         "You should either specify the precise identity to use with " +
+             "ios_code_signing_identity or let the code select an identity " +
+             "automatically (via find_signing_identity.py which use the " +
+             "variable ios_code_signing_identity_description to set the " +
+             "pattern to match the identity to use).")
+}
+
+# Initialize additional_toolchains from additional_target_cpus. Assert here
+# that the list does not contains $target_cpu nor duplicates as this would
+# cause weird errors during the build.
+additional_toolchains = []
+if (additional_target_cpus != [] && !is_fat_secondary_toolchain) {
+  foreach(_additional_target_cpu, additional_target_cpus) {
+    assert(_additional_target_cpu != target_cpu,
+           "target_cpu must not be listed in additional_target_cpus")
+
+    _toolchain = "${current_toolchain}_fat_${_additional_target_cpu}"
+    foreach(_additional_toolchain, additional_toolchains) {
+      assert(_toolchain != _additional_toolchain,
+             "additional_target_cpus must not contains duplicate values")
+    }
+
+    additional_toolchains += [ _toolchain ]
+  }
+}
+
+if (ios_sdk_path == "") {
+  # Compute default target.
+  if (target_environment == "simulator") {
+    ios_sdk_name = "iphonesimulator"
+    ios_sdk_platform = "iPhoneSimulator"
+  } else if (target_environment == "device") {
+    ios_sdk_name = "iphoneos"
+    ios_sdk_platform = "iPhoneOS"
+  } else if (target_environment == "catalyst") {
+    ios_sdk_name = "macosx"
+    ios_sdk_platform = "MacOSX"
+  } else {
+    assert(false, "unsupported environment: $target_environment")
+  }
+
+  ios_sdk_info_args = [
+    "--get_sdk_info",
+    "--get_machine_info",
+  ]
+  ios_sdk_info_args += [ ios_sdk_name ]
+  if (ios_sdk_developer_dir != "") {
+    ios_sdk_info_args += [
+      "--developer_dir",
+      ios_sdk_developer_dir,
+    ]
+  }
+  if (use_system_xcode && use_goma) {
+    ios_sdk_info_args += [
+      "--create_symlink_at",
+      "sdk/xcode_links",
+    ]
+  }
+  script_name = "//build/config/apple/sdk_info.py"
+  _ios_sdk_result = exec_script(script_name, ios_sdk_info_args, "scope")
+  ios_bin_path =
+      rebase_path("${_ios_sdk_result.toolchains_path}/usr/bin/", root_build_dir)
+  ios_sdk_path = _ios_sdk_result.sdk_path
+  ios_sdk_platform_path = _ios_sdk_result.sdk_platform_path
+  ios_sdk_version = _ios_sdk_result.sdk_version
+  ios_sdk_build = _ios_sdk_result.sdk_build
+  ios_toolchains_path = _ios_sdk_result.toolchains_path
+  xcode_version = _ios_sdk_result.xcode_version
+  xcode_version_int = _ios_sdk_result.xcode_version_int
+  xcode_build = _ios_sdk_result.xcode_build
+  machine_os_build = _ios_sdk_result.machine_os_build
+  if (target_environment == "simulator") {
+    # This is weird, but Xcode sets DTPlatformBuild to an empty field for
+    # simulator builds.
+    ios_platform_build = ""
+  } else {
+    ios_platform_build = ios_sdk_build
+  }
+}
+
+if (target_environment == "device" && ios_enable_code_signing) {
+  # Automatically select a codesigning identity if no identity is configured.
+  # This only applies to device build as simulator builds are not signed.
+  if (ios_code_signing_identity == "") {
+    find_signing_identity_args = []
+    if (ios_code_signing_identity_description != "") {
+      find_signing_identity_args = [
+        "--matching-pattern",
+        ios_code_signing_identity_description,
+      ]
+    }
+    ios_code_signing_identity = exec_script("find_signing_identity.py",
+                                            find_signing_identity_args,
+                                            "trim string")
+  }
+}
diff --git a/third_party/libwebrtc/build/config/ios/ios_sdk_overrides.gni b/third_party/libwebrtc/build/config/ios/ios_sdk_overrides.gni
new file mode 100644
index 0000000000..12d52521da
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/ios_sdk_overrides.gni
@@ -0,0 +1,17 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This file contains arguments that subprojects may choose to override. It
+# asserts that those overrides are used, to prevent unused args warnings.
+
+declare_args() {
+  # Version of iOS that we're targeting.
+  ios_deployment_target = "14.0"
+}
+
+# Always assert that ios_deployment_target is used on non-iOS platforms to
+# prevent unused args warnings.
+if (!is_ios) {
+  assert(ios_deployment_target == "14.0" || true)
+}
diff --git a/third_party/libwebrtc/build/config/ios/ios_test_runner_wrapper.gni b/third_party/libwebrtc/build/config/ios/ios_test_runner_wrapper.gni
new file mode 100644
index 0000000000..115db7ffdb
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/ios_test_runner_wrapper.gni
@@ -0,0 +1,143 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/coverage/coverage.gni")
+import("//build/config/ios/ios_sdk.gni")
+import("//build/util/generate_wrapper.gni")
+
+# Invokes generate_wrapper to create an executable script wrapping iOS'
+# run.py with baked in arguments. Only takes effect when test entry in
+# gn_isolate_map.pyl is updated to type="generated_script" with script
+# set to the wrapper output path.
+#
+# Arguments:
+#
+# data
+#   (optional, default [ "//ios/build/bots/scripts/" ]) list of files or
+#   directories required to run target
+#
+# data_deps
+#   (optional) list of target non-linked labels
+#
+# deps
+#   (optional) list of files or directories required to run target
+#
+# executable_args
+#   (optional) a list of string arguments to pass to run.py
+#
+# retries
+#   (optional, default 3) number of retry attempts
+#
+# shards
+#   (optional, default 1) number of shards to execute tests in parallel. not
+#   the same as swarming shards.
+#
+# wrapper_output_name
+#   (optional, default "run_${target_name}") name of the wrapper script
+#
+template("ios_test_runner_wrapper") {
+  generate_wrapper(target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "deps",
+                             "retries",
+                             "shards",
+                             "wrapper_output_name",
+                           ])
+    testonly = true
+    executable = "//testing/test_env.py"
+
+    # iOS main test runner
+    _runner_path =
+        rebase_path("//ios/build/bots/scripts/run.py", root_build_dir)
+
+    executable_args = [ "@WrappedPath(${_runner_path})" ]
+
+    # arguments passed to run.py
+    if (defined(invoker.executable_args)) {
+      executable_args += invoker.executable_args
+    }
+
+    _rebased_mac_toolchain = rebase_path("//mac_toolchain", root_build_dir)
+    _rebased_xcode_path = rebase_path("//Xcode.app", root_build_dir)
+    _rebased_ios_runtime_cache_prefix =
+        rebase_path("//Runtime-ios-", root_build_dir)
+
+    # --out-dir argument is specified in gn_isolate_map.pyl because
+    # ${ISOLATED_OUTDIR} doesn't get resolved through this wrapper.
+    executable_args += [
+      "--xcode-path",
+      "@WrappedPath(${_rebased_xcode_path})",
+      "--mac-toolchain-cmd",
+      "@WrappedPath(${_rebased_mac_toolchain})",
+      "--runtime-cache-prefix",
+      "@WrappedPath(${_rebased_ios_runtime_cache_prefix})",
+    ]
+
+    # Default retries to 3
+    if (!defined(retries)) {
+      retries = 3
+    }
+    executable_args += [
+      "--retries",
+      "${retries}",
+    ]
+
+    # Default shards to 1
+    if (!defined(shards)) {
+      shards = 1
+    }
+    executable_args += [
+      "--shards",
+      "${shards}",
+    ]
+
+    data_deps = [ "//testing:test_scripts_shared" ]
+    if (defined(invoker.data_deps)) {
+      data_deps += invoker.data_deps
+    }
+
+    # test runner relies on iossim for simulator builds.
+    if (target_environment == "simulator") {
+      _rebased_root_build_dir = rebase_path("${root_build_dir}", root_build_dir)
+      data_deps += [ "//testing/iossim" ]
+
+      executable_args += [
+        "--iossim",
+        "@WrappedPath(${_rebased_root_build_dir}/iossim)",
+      ]
+    }
+
+    if (use_clang_coverage) {
+      executable_args += [ "--use-clang-coverage" ]
+    }
+
+    if (!is_debug) {
+      executable_args += [ "--release" ]
+    }
+
+    # wrapper script output name and path
+    if (!defined(wrapper_output_name)) {
+      _wrapper_output_name = "run_${target_name}"
+    } else {
+      _wrapper_output_name = wrapper_output_name
+    }
+
+    # Test targets may attempt to generate multiple wrappers for a suite with
+    # multiple different toolchains when running with additional_target_cpus.
+    # Generate the wrapper script into root_out_dir rather than root_build_dir
+    # to ensure those wrappers are distinct.
+    wrapper_script = "${root_out_dir}/bin/${_wrapper_output_name}"
+
+    data = []
+    if (defined(invoker.data)) {
+      data += invoker.data
+    }
+    data += [
+      "//.vpython",
+      "//ios/build/bots/scripts/",
+      "//testing/test_env.py",
+    ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/ios/resources/XCTRunnerAddition+Info.plist b/third_party/libwebrtc/build/config/ios/resources/XCTRunnerAddition+Info.plist
new file mode 100644
index 0000000000..cf9463f694
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/resources/XCTRunnerAddition+Info.plist
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleIdentifier</key>
+  <string>com.apple.test.${EXECUTABLE_NAME}</string>
+  <key>CFBundleName</key>
+  <string>${PRODUCT_NAME}</string>
+  <key>CFBundleExecutable</key>
+  <string>${EXECUTABLE_NAME}</string>
+</dict>
+</plist>
diff --git a/third_party/libwebrtc/build/config/ios/rules.gni b/third_party/libwebrtc/build/config/ios/rules.gni
new file mode 100644
index 0000000000..04d605dd97
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/rules.gni
@@ -0,0 +1,2173 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/apple/apple_info_plist.gni")
+import("//build/config/apple/symbols.gni")
+import("//build/config/ios/ios_sdk.gni")
+import("//build/toolchain/goma.gni")
+import("//build/toolchain/toolchain.gni")
+import("//build_overrides/build.gni")
+
+declare_args() {
+  # Set to true if an Xcode project is generated for this build. Set this to
+  # false if you do not plan to run `gn gen --ide=xcode` in this directory.
+  # This will speed up the generation at the cost of generating an invalid
+  # Xcode project if `gn gen --ide=xcode` is used. Defaults to true (favor
+  # correctness over speed).
+  ios_set_attributes_for_xcode_project_generation = true
+}
+
+# Constants corresponding to the bundle type identifiers use application,
+# application extension, XCTest and XCUITest targets respectively.
+_ios_xcode_app_bundle_id = "com.apple.product-type.application"
+_ios_xcode_appex_bundle_id = "com.apple.product-type.app-extension"
+_ios_xcode_xctest_bundle_id = "com.apple.product-type.bundle.unit-test"
+_ios_xcode_xcuitest_bundle_id = "com.apple.product-type.bundle.ui-testing"
+
+# Invokes lipo on multiple arch-specific binaries to create a fat binary.
+#
+# Arguments
+#
+#   arch_binary_target
+#     name of the target generating the arch-specific binaries, they must
+#     be named $target_out_dir/$toolchain_cpu/$arch_binary_output.
+#
+#   arch_binary_output
+#     (optional, defaults to the name of $arch_binary_target) base name of
+#     the arch-specific binary generated by arch_binary_target.
+#
+#   output_name
+#     (optional, defaults to $target_name) base name of the target output,
+#     the full path will be $target_out_dir/$output_name.
+#
+#   configs
+#     (optional) a list of configurations, this is used to check whether
+#     the binary should be stripped, when "enable_stripping" is true.
+#
+template("lipo_binary") {
+  assert(defined(invoker.arch_binary_target),
+         "arch_binary_target must be defined for $target_name")
+
+  assert(!is_fat_secondary_toolchain,
+         "lipo_binary can only be used in the primary toolchain of a fat build")
+
+  _target_name = target_name
+  _output_name = target_name
+  if (defined(invoker.output_name)) {
+    _output_name = invoker.output_name
+  }
+
+  _all_target_cpu = [ target_cpu ] + additional_target_cpus
+  _all_toolchains = [ current_toolchain ] + additional_toolchains
+
+  _arch_binary_target = invoker.arch_binary_target
+  _arch_binary_output = get_label_info(_arch_binary_target, "name")
+  if (defined(invoker.arch_binary_output)) {
+    _arch_binary_output = invoker.arch_binary_output
+  }
+
+  action(_target_name) {
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "arch_binary_output",
+                             "arch_binary_target",
+                             "configs",
+                             "output_name",
+                           ])
+
+    script = "//build/toolchain/apple/linker_driver.py"
+
+    # http://crbug.com/762840. Fix for bots running out of memory.
+    pool = "//build/toolchain:link_pool($default_toolchain)"
+
+    outputs = [ "$target_out_dir/$_output_name" ]
+
+    deps = []
+    _index = 0
+    inputs = []
+    foreach(_cpu, _all_target_cpu) {
+      _toolchain = _all_toolchains[_index]
+      _index = _index + 1
+
+      inputs +=
+          [ get_label_info("$_arch_binary_target($_toolchain)",
+                           "target_out_dir") + "/$_cpu/$_arch_binary_output" ]
+
+      deps += [ "$_arch_binary_target($_toolchain)" ]
+    }
+
+    args = [
+             "xcrun",
+             "lipo",
+             "-create",
+             "-output",
+             rebase_path("$target_out_dir/$_output_name", root_build_dir),
+           ] + rebase_path(inputs, root_build_dir)
+
+    if (enable_dsyms) {
+      _dsyms_output_dir = "$root_out_dir/$_output_name.dSYM"
+      outputs += [
+        "$_dsyms_output_dir/",
+        "$_dsyms_output_dir/Contents/Info.plist",
+        "$_dsyms_output_dir/Contents/Resources/DWARF/$_output_name",
+      ]
+      args += [ "-Wcrl,dsym," + rebase_path("$root_out_dir/.", root_build_dir) ]
+      if (!use_xcode_clang) {
+        args += [ "-Wcrl,dsymutilpath," +
+                  rebase_path("//tools/clang/dsymutil/bin/dsymutil",
+                              root_build_dir) ]
+      }
+    }
+
+    if (enable_stripping) {
+      args += [ "-Wcrl,strip,-x,-S" ]
+      if (save_unstripped_output) {
+        outputs += [ "$root_out_dir/$_output_name.unstripped" ]
+        args += [ "-Wcrl,unstripped," +
+                  rebase_path("$root_out_dir/.", root_build_dir) ]
+      }
+    }
+  }
+}
+
+# Wrapper around create_bundle taking care of code signature settings.
+#
+# Arguments
+#
+#   product_type
+#       string, product type for the generated Xcode project.
+#
+#   bundle_gen_dir
+#       (optional) directory where the bundle is generated; must be below
+#       root_out_dir and defaults to root_out_dir if omitted.
+#
+#   bundle_deps
+#       (optional) list of additional dependencies.
+#
+#   bundle_deps_filter
+#       (optional) list of dependencies to filter (for more information
+#       see "gn help bundle_deps_filter").
+#
+#   bundle_extension
+#       string, extension of the bundle, used to generate bundle name.
+#
+#   bundle_binary_target
+#       (optional) string, label of the target generating the bundle main
+#       binary. This target and bundle_binary_path are mutually exclusive.
+#
+#   bundle_binary_output
+#       (optional) string, base name of the binary generated by the
+#       bundle_binary_target target, defaults to the target name.
+#
+#   bundle_binary_path
+#       (optional) string, path to the bundle main binary. This target and
+#       bundle_binary_target are mutually exclusive.
+#
+#   output_name:
+#       (optional) string, name of the generated application, if omitted,
+#       defaults to the target_name.
+#
+#   extra_system_frameworks
+#       (optional) list of system framework to copy to the bundle.
+#
+#   enable_code_signing
+#       (optional) boolean, control whether code signing is enabled or not,
+#       default to ios_enable_code_signing if not defined.
+#
+#   entitlements_path:
+#       (optional) path to the template to use to generate the application
+#       entitlements by performing variable substitutions, defaults to
+#       //build/config/ios/entitlements.plist.
+#
+#   entitlements_target:
+#       (optional) label of the target generating the application
+#       entitlements (must generate a single file as output); cannot be
+#       defined if entitlements_path is set.
+#
+#   has_public_headers:
+#       (optional) boolean, defaults to false; only meaningful if the bundle
+#       is a framework bundle; if true, then the frameworks includes public
+#       headers
+#
+#   disable_entitlements
+#       (optional, defaults to false) boolean, control whether entitlements willi
+#       be embedded in the application during signature. If false and no
+#       entitlements are provided, default empty entitlements will be used.
+#
+#   disable_embedded_mobileprovision
+#       (optional, default to false) boolean, control whether mobile provisions
+#       will be embedded in the bundle. If true, the existing
+#       embedded.mobileprovision will be deleted.
+#
+#   xcode_extra_attributes
+#       (optional) scope, extra attributes for Xcode projects.
+#
+#   xcode_test_application_name:
+#       (optional) string, name of the test application for Xcode unit or ui
+#       test target.
+#
+#   xcode_product_bundle_id:
+#       (optional) string, the bundle ID that will be added in the XCode
+#       attributes to enable some features when debugging (e.g. MetricKit).
+#
+#   primary_info_plist:
+#       (optional) path to Info.plist to merge with the $partial_info_plist
+#       generated by the compilation of the asset catalog.
+#
+#   partial_info_plist:
+#       (optional) path to the partial Info.plist generated by the asset
+#       catalog compiler; if defined $primary_info_plist must also be defined.
+#
+template("create_signed_bundle") {
+  assert(defined(invoker.product_type),
+         "product_type must be defined for $target_name")
+  assert(defined(invoker.bundle_extension),
+         "bundle_extension must be defined for $target_name")
+  assert(defined(invoker.bundle_binary_target) !=
+             defined(invoker.bundle_binary_path),
+         "Only one of bundle_binary_target or bundle_binary_path may be " +
+             "specified for $target_name")
+  assert(!defined(invoker.partial_info_plist) ||
+             defined(invoker.primary_info_plist),
+         "primary_info_plist must be defined when partial_info_plist is " +
+             "defined for $target_name")
+
+  if (defined(invoker.xcode_test_application_name)) {
+    assert(
+        invoker.product_type == _ios_xcode_xctest_bundle_id ||
+            invoker.product_type == _ios_xcode_xcuitest_bundle_id,
+        "xcode_test_application_name can be only defined for Xcode unit or ui test target.")
+  }
+
+  _target_name = target_name
+  _output_name = target_name
+  if (defined(invoker.output_name)) {
+    _output_name = invoker.output_name
+  }
+
+  if (defined(invoker.bundle_binary_path)) {
+    _bundle_binary_path = invoker.bundle_binary_path
+  } else {
+    _bundle_binary_target = invoker.bundle_binary_target
+    _bundle_binary_output = get_label_info(_bundle_binary_target, "name")
+    if (defined(invoker.bundle_binary_output)) {
+      _bundle_binary_output = invoker.bundle_binary_output
+    }
+    _bundle_binary_path =
+        get_label_info(_bundle_binary_target, "target_out_dir") +
+        "/$_bundle_binary_output"
+  }
+
+  _bundle_gen_dir = root_out_dir
+  if (defined(invoker.bundle_gen_dir)) {
+    _bundle_gen_dir = invoker.bundle_gen_dir
+  }
+
+  _bundle_extension = invoker.bundle_extension
+
+  _enable_embedded_mobileprovision = true
+  if (defined(invoker.disable_embedded_mobileprovision)) {
+    _enable_embedded_mobileprovision = !invoker.disable_embedded_mobileprovision
+  }
+
+  if (target_environment == "catalyst") {
+    _enable_embedded_mobileprovision = false
+  }
+
+  _enable_entitlements = true
+  if (defined(invoker.disable_entitlements)) {
+    _enable_entitlements = !invoker.disable_entitlements
+  }
+
+  if (_enable_entitlements) {
+    if (!defined(invoker.entitlements_target)) {
+      _entitlements_path = "//build/config/ios/entitlements.plist"
+      if (defined(invoker.entitlements_path)) {
+        _entitlements_path = invoker.entitlements_path
+      }
+    } else {
+      assert(!defined(invoker.entitlements_path),
+             "Cannot define both entitlements_path and entitlements_target " +
+                 "for $target_name")
+
+      _entitlements_target_outputs =
+          get_target_outputs(invoker.entitlements_target)
+      _entitlements_path = _entitlements_target_outputs[0]
+    }
+  }
+
+  _enable_code_signing = ios_enable_code_signing
+  if (defined(invoker.enable_code_signing)) {
+    _enable_code_signing = invoker.enable_code_signing
+  }
+
+  if (!ios_set_attributes_for_xcode_project_generation) {
+    not_needed(invoker,
+               [
+                 "xcode_product_bundle_id",
+                 "xcode_extra_attributes",
+               ])
+  }
+
+  create_bundle(_target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "bundle_deps_filter",
+                             "data_deps",
+                             "deps",
+                             "partial_info_plist",
+                             "product_type",
+                             "public_configs",
+                             "public_deps",
+                             "testonly",
+                             "visibility",
+                             "xcode_test_application_name",
+                           ])
+
+    bundle_root_dir = "$_bundle_gen_dir/$_output_name$_bundle_extension"
+    if (target_environment == "simulator" || target_environment == "device") {
+      bundle_contents_dir = bundle_root_dir
+      bundle_resources_dir = bundle_contents_dir
+      bundle_executable_dir = bundle_contents_dir
+    } else if (target_environment == "catalyst") {
+      if (_bundle_extension != ".framework") {
+        bundle_contents_dir = "$bundle_root_dir/Contents"
+        bundle_resources_dir = "$bundle_contents_dir/Resources"
+        bundle_executable_dir = "$bundle_contents_dir/MacOS"
+      } else {
+        bundle_contents_dir = "$bundle_root_dir/Versions/A"
+        bundle_resources_dir = "$bundle_contents_dir/Resources"
+        bundle_executable_dir = bundle_contents_dir
+      }
+    }
+
+    if (!defined(public_deps)) {
+      public_deps = []
+    }
+
+    if (ios_set_attributes_for_xcode_project_generation) {
+      _xcode_product_bundle_id = ""
+      if (defined(invoker.xcode_product_bundle_id)) {
+        _xcode_product_bundle_id = invoker.xcode_product_bundle_id
+      }
+
+      if (_xcode_product_bundle_id != "") {
+        _ios_provisioning_profile_info =
+            exec_script("//build/config/ios/codesign.py",
+                        [
+                          "find-provisioning-profile",
+                          "-b=" + _xcode_product_bundle_id,
+                        ],
+                        "json")
+      }
+
+      xcode_extra_attributes = {
+        IPHONEOS_DEPLOYMENT_TARGET = ios_deployment_target
+        if (_xcode_product_bundle_id != "") {
+          CODE_SIGN_IDENTITY = "iPhone Developer"
+          DEVELOPMENT_TEAM = _ios_provisioning_profile_info.team_identifier
+          PRODUCT_BUNDLE_IDENTIFIER = _xcode_product_bundle_id
+          PROVISIONING_PROFILE_SPECIFIER = _ios_provisioning_profile_info.name
+        }
+
+        # If invoker has defined extra attributes, they override the defaults.
+        if (defined(invoker.xcode_extra_attributes)) {
+          forward_variables_from(invoker.xcode_extra_attributes, "*")
+        }
+      }
+    }
+
+    if (defined(invoker.bundle_binary_target)) {
+      public_deps += [ invoker.bundle_binary_target ]
+    }
+
+    if (defined(invoker.bundle_deps)) {
+      if (!defined(deps)) {
+        deps = []
+      }
+      deps += invoker.bundle_deps
+    }
+    if (!defined(deps)) {
+      deps = []
+    }
+
+    code_signing_script = "//build/config/ios/codesign.py"
+    code_signing_sources = [ _bundle_binary_path ]
+    if (_enable_entitlements) {
+      if (defined(invoker.entitlements_target)) {
+        deps += [ invoker.entitlements_target ]
+      }
+      code_signing_sources += [ _entitlements_path ]
+    }
+    code_signing_outputs = [ "$bundle_executable_dir/$_output_name" ]
+    if (_enable_code_signing) {
+      code_signing_outputs +=
+          [ "$bundle_contents_dir/_CodeSignature/CodeResources" ]
+    }
+    if (ios_code_signing_identity != "" && target_environment == "device" &&
+        _enable_embedded_mobileprovision) {
+      code_signing_outputs +=
+          [ "$bundle_contents_dir/embedded.mobileprovision" ]
+    }
+    if (_bundle_extension == ".framework") {
+      if (target_environment == "catalyst") {
+        code_signing_outputs += [
+          "$bundle_root_dir/Versions/Current",
+          "$bundle_root_dir/$_output_name",
+        ]
+
+        if (defined(invoker.has_public_headers) && invoker.has_public_headers) {
+          code_signing_outputs += [
+            "$bundle_root_dir/Headers",
+            "$bundle_root_dir/Modules",
+          ]
+        }
+      } else {
+        not_needed(invoker, [ "has_public_headers" ])
+      }
+    }
+
+    if (defined(invoker.extra_system_frameworks)) {
+      foreach(_framework, invoker.extra_system_frameworks) {
+        code_signing_outputs += [ "$bundle_contents_dir/Frameworks/" +
+                                  get_path_info(_framework, "file") ]
+      }
+    }
+
+    code_signing_args = [
+      "code-sign-bundle",
+      "-t=" + ios_sdk_name,
+      "-i=" + ios_code_signing_identity,
+      "-b=" + rebase_path(_bundle_binary_path, root_build_dir),
+    ]
+    if (_enable_entitlements) {
+      code_signing_args +=
+          [ "-e=" + rebase_path(_entitlements_path, root_build_dir) ]
+    }
+    if (!_enable_embedded_mobileprovision) {
+      code_signing_args += [ "--disable-embedded-mobileprovision" ]
+    }
+    code_signing_args += [ rebase_path(bundle_root_dir, root_build_dir) ]
+    if (!_enable_code_signing) {
+      code_signing_args += [ "--disable-code-signature" ]
+    }
+    if (defined(invoker.extra_system_frameworks)) {
+      # All framework in extra_system_frameworks are expected to be system
+      # framework and the path to be already system absolute so do not use
+      # rebase_path here unless using Goma RBE and system Xcode (as in that
+      # case the system framework are found via a symlink in root_build_dir).
+      foreach(_framework, invoker.extra_system_frameworks) {
+        if (use_system_xcode && use_goma) {
+          _framework_path = rebase_path(_framework, root_build_dir)
+        } else {
+          _framework_path = _framework
+        }
+        code_signing_args += [ "-F=$_framework_path" ]
+      }
+    }
+    if (defined(invoker.partial_info_plist)) {
+      _partial_info_plists = [
+        invoker.primary_info_plist,
+        invoker.partial_info_plist,
+      ]
+
+      _plist_compiler_path = "//build/apple/plist_util.py"
+
+      code_signing_sources += _partial_info_plists
+      code_signing_sources += [ _plist_compiler_path ]
+      if (target_environment != "catalyst" ||
+          _bundle_extension != ".framework") {
+        code_signing_outputs += [ "$bundle_contents_dir/Info.plist" ]
+      } else {
+        code_signing_outputs += [ "$bundle_resources_dir/Info.plist" ]
+      }
+
+      code_signing_args +=
+          [ "-P=" + rebase_path(_plist_compiler_path, root_build_dir) ]
+      foreach(_partial_info_plist, _partial_info_plists) {
+        code_signing_args +=
+            [ "-p=" + rebase_path(_partial_info_plist, root_build_dir) ]
+      }
+    }
+  }
+}
+
+# Generates Info.plist files for Mac apps and frameworks.
+#
+# Arguments
+#
+#     info_plist:
+#         (optional) string, path to the Info.plist file that will be used for
+#         the bundle.
+#
+#     info_plist_target:
+#         (optional) string, if the info_plist is generated from an action,
+#         rather than a regular source file, specify the target name in lieu
+#         of info_plist. The two arguments are mutually exclusive.
+#
+#     executable_name:
+#         string, name of the generated target used for the product
+#         and executable name as specified in the output Info.plist.
+#
+#     extra_substitutions:
+#         (optional) string array, 'key=value' pairs for extra fields which are
+#         specified in a source Info.plist template.
+template("ios_info_plist") {
+  assert(defined(invoker.info_plist) != defined(invoker.info_plist_target),
+         "Only one of info_plist or info_plist_target may be specified in " +
+             target_name)
+
+  if (defined(invoker.info_plist)) {
+    _info_plist = invoker.info_plist
+  } else {
+    _info_plist_target_output = get_target_outputs(invoker.info_plist_target)
+    _info_plist = _info_plist_target_output[0]
+  }
+
+  apple_info_plist(target_name) {
+    format = "binary1"
+    extra_substitutions = []
+    if (defined(invoker.extra_substitutions)) {
+      extra_substitutions = invoker.extra_substitutions
+    }
+    extra_substitutions += [
+      "IOS_BUNDLE_ID_PREFIX=$ios_app_bundle_id_prefix",
+      "IOS_PLATFORM_BUILD=$ios_platform_build",
+      "IOS_PLATFORM_NAME=$ios_sdk_name",
+      "IOS_PLATFORM_VERSION=$ios_sdk_version",
+      "IOS_SDK_BUILD=$ios_sdk_build",
+      "IOS_SDK_NAME=$ios_sdk_name$ios_sdk_version",
+      "IOS_SUPPORTED_PLATFORM=$ios_sdk_platform",
+      "BUILD_MACHINE_OS_BUILD=$machine_os_build",
+      "IOS_DEPLOYMENT_TARGET=$ios_deployment_target",
+      "XCODE_BUILD=$xcode_build",
+      "XCODE_VERSION=$xcode_version",
+    ]
+    plist_templates = [
+      "//build/config/ios/BuildInfo.plist",
+      _info_plist,
+    ]
+    if (defined(invoker.info_plist_target)) {
+      deps = [ invoker.info_plist_target ]
+    }
+    forward_variables_from(invoker,
+                           [
+                             "executable_name",
+                             "output_name",
+                             "visibility",
+                             "testonly",
+                           ])
+  }
+}
+
+# Template to build an application bundle for iOS.
+#
+# This should be used instead of "executable" built-in target type on iOS.
+# As the template forward the generation of the application executable to
+# an "executable" target, all arguments supported by "executable" targets
+# are also supported by this template.
+#
+# Arguments
+#
+#   output_name:
+#       (optional) string, name of the generated application, if omitted,
+#       defaults to the target_name.
+#
+#   extra_substitutions:
+#       (optional) list of string in "key=value" format, each value will
+#       be used as an additional variable substitution rule when generating
+#       the application Info.plist
+#
+#   info_plist:
+#       (optional) string, path to the Info.plist file that will be used for
+#       the bundle.
+#
+#   info_plist_target:
+#       (optional) string, if the info_plist is generated from an action,
+#       rather than a regular source file, specify the target name in lieu
+#       of info_plist. The two arguments are mutually exclusive.
+#
+#   entitlements_path:
+#       (optional) path to the template to use to generate the application
+#       entitlements by performing variable substitutions, defaults to
+#       //build/config/ios/entitlements.plist.
+#
+#   entitlements_target:
+#       (optional) label of the target generating the application
+#       entitlements (must generate a single file as output); cannot be
+#       defined if entitlements_path is set.
+#
+#   product_type
+#       (optional) string, product type for the generated Xcode project,
+#       default to "com.apple.product-type.application". Should only be
+#       overriden when building application extension.
+#
+#   enable_code_signing
+#       (optional) boolean, control whether code signing is enabled or not,
+#       default to ios_enable_code_signing if not defined.
+#
+#   variants
+#       (optional) list of scopes, each scope needs to define the attributes
+#       "name" and "bundle_deps"; if defined and non-empty, then one bundle
+#       named $target_out_dir/$variant/$output_name will be created for each
+#       variant with the same binary but the correct bundle_deps, the bundle
+#       at $target_out_dir/$output_name will be a copy of the first variant.
+#
+#   xcode_product_bundle_id:
+#       (optional) string, the bundle ID that will be added in the XCode
+#       attributes to enable some features when debugging (e.g. MetricKit).
+#       defaults to "$ios_app_bundle_id_prefix.$output_name".
+#
+# For more information, see "gn help executable".
+template("ios_app_bundle") {
+  _output_name = target_name
+  _target_name = target_name
+  if (defined(invoker.output_name)) {
+    _output_name = invoker.output_name
+  }
+
+  _primary_toolchain = current_toolchain
+  if (is_fat_secondary_toolchain) {
+    _primary_toolchain = primary_fat_toolchain_name
+  }
+
+  assert(
+      !defined(invoker.bundle_extension),
+      "bundle_extension must not be set for ios_app_bundle template for $target_name")
+
+  _xcode_product_bundle_id = "$ios_app_bundle_id_prefix.$_output_name"
+  if (defined(invoker.xcode_product_bundle_id)) {
+    _xcode_product_bundle_id = invoker.xcode_product_bundle_id
+    _xcode_product_bundle_id =
+        "$ios_app_bundle_id_prefix.$_xcode_product_bundle_id"
+  } else if (defined(invoker.bundle_id)) {
+    _xcode_product_bundle_id = invoker.bundle_id
+  }
+
+  # Bundle ID should respect rfc1034 and replace _ with -.
+  _xcode_product_bundle_id =
+      string_replace("$_xcode_product_bundle_id", "_", "-")
+
+  _arch_executable_source = _target_name + "_arch_executable_sources"
+  _arch_executable_target = _target_name + "_arch_executable"
+  _lipo_executable_target = _target_name + "_executable"
+
+  if (defined(invoker.variants) && invoker.variants != []) {
+    _variants = []
+
+    foreach(_variant, invoker.variants) {
+      assert(defined(_variant.name) && _variant.name != "",
+             "name must be defined for all $target_name variants")
+
+      assert(defined(_variant.bundle_deps),
+             "bundle_deps must be defined for all $target_name variants")
+
+      _variants += [
+        {
+          name = _variant.name
+          bundle_deps = _variant.bundle_deps
+          target_name = "${_target_name}_variants_${_variant.name}"
+          bundle_gen_dir = "$root_out_dir/variants/${_variant.name}"
+        },
+      ]
+    }
+  } else {
+    # If no variants are passed to the template, use a fake variant with
+    # no name to avoid duplicating code. As no variant can have an empty
+    # name except this fake variant, it is possible to know if a variant
+    # is fake or not.
+    _variants = [
+      {
+        name = ""
+        bundle_deps = []
+        target_name = _target_name
+        bundle_gen_dir = root_out_dir
+      },
+    ]
+  }
+
+  _default_variant = _variants[0]
+
+  source_set(_arch_executable_source) {
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "bundle_deps",
+                             "bundle_deps_filter",
+                             "bundle_extension",
+                             "enable_code_signing",
+                             "entitlements_path",
+                             "entitlements_target",
+                             "extra_substitutions",
+                             "extra_system_frameworks",
+                             "info_plist",
+                             "info_plist_target",
+                             "output_name",
+                             "product_type",
+                             "visibility",
+                             "xcode_extra_attributes",
+                           ])
+
+    visibility = [ ":$_arch_executable_target" ]
+  }
+
+  if (!is_fat_secondary_toolchain || target_environment == "simulator") {
+    _generate_entitlements_target = _target_name + "_gen_entitlements"
+    _generate_entitlements_output =
+        get_label_info(":$_generate_entitlements_target($_primary_toolchain)",
+                       "target_out_dir") + "/$_output_name.xcent"
+  }
+
+  _product_type = _ios_xcode_app_bundle_id
+  if (defined(invoker.product_type)) {
+    _product_type = invoker.product_type
+  }
+
+  if (_product_type == _ios_xcode_app_bundle_id) {
+    _bundle_extension = ".app"
+  } else if (_product_type == _ios_xcode_appex_bundle_id) {
+    _bundle_extension = ".appex"
+  } else {
+    assert(false, "unknown product_type \"$product_type\" for $_target_name")
+  }
+
+  _is_app_bundle = _product_type == _ios_xcode_app_bundle_id
+
+  executable(_arch_executable_target) {
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "bundle_deps",
+                             "bundle_deps_filter",
+                             "bundle_extension",
+                             "enable_code_signing",
+                             "entitlements_path",
+                             "entitlements_target",
+                             "extra_substitutions",
+                             "extra_system_frameworks",
+                             "info_plist",
+                             "info_plist_target",
+                             "output_name",
+                             "product_type",
+                             "sources",
+                             "visibility",
+                             "xcode_extra_attributes",
+                           ])
+
+    visibility = [ ":$_lipo_executable_target($_primary_toolchain)" ]
+    if (is_fat_secondary_toolchain) {
+      visibility += [ ":$_target_name" ]
+    }
+
+    if (!defined(deps)) {
+      deps = []
+    }
+    deps += [ ":$_arch_executable_source" ]
+
+    if (!defined(frameworks)) {
+      frameworks = []
+    }
+    frameworks += [ "UIKit.framework" ]
+
+    if (target_environment == "simulator") {
+      deps += [ ":$_generate_entitlements_target($_primary_toolchain)" ]
+
+      if (!defined(inputs)) {
+        inputs = []
+      }
+      inputs += [ _generate_entitlements_output ]
+
+      if (!defined(ldflags)) {
+        ldflags = []
+      }
+      ldflags += [ "-Wl,-sectcreate,__TEXT,__entitlements," +
+                   rebase_path(_generate_entitlements_output, root_build_dir) ]
+    }
+
+    output_name = _output_name
+    output_prefix_override = true
+    output_dir = "$target_out_dir/$target_cpu"
+  }
+
+  if (is_fat_secondary_toolchain) {
+    # For fat builds, only the default toolchain will generate an application
+    # bundle. For the other toolchains, the template is only used for building
+    # the arch-specific binary, thus the default target is just a group().
+
+    group(_target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "visibility",
+                               "testonly",
+                             ])
+      public_deps = [ ":$_arch_executable_target" ]
+    }
+  } else {
+    lipo_binary(_lipo_executable_target) {
+      forward_variables_from(invoker,
+                             [
+                               "configs",
+                               "testonly",
+                             ])
+
+      visibility = []
+      foreach(_variant, _variants) {
+        visibility += [ ":${_variant.target_name}" ]
+      }
+
+      output_name = _output_name
+      arch_binary_target = ":$_arch_executable_target"
+      arch_binary_output = _output_name
+    }
+
+    _generate_info_plist = target_name + "_generate_info_plist"
+    ios_info_plist(_generate_info_plist) {
+      forward_variables_from(invoker,
+                             [
+                               "extra_substitutions",
+                               "info_plist",
+                               "info_plist_target",
+                             ])
+
+      executable_name = _output_name
+    }
+
+    if (!is_fat_secondary_toolchain) {
+      if (!defined(invoker.entitlements_target)) {
+        _entitlements_path = "//build/config/ios/entitlements.plist"
+        if (defined(invoker.entitlements_path)) {
+          _entitlements_path = invoker.entitlements_path
+        }
+      } else {
+        assert(!defined(invoker.entitlements_path),
+               "Cannot define both entitlements_path and entitlements_target" +
+                   "for $_target_name")
+
+        _entitlements_target_outputs =
+            get_target_outputs(invoker.entitlements_target)
+        _entitlements_path = _entitlements_target_outputs[0]
+      }
+
+      action(_generate_entitlements_target) {
+        _gen_info_plist_outputs = get_target_outputs(":$_generate_info_plist")
+        _info_plist_path = _gen_info_plist_outputs[0]
+
+        script = "//build/config/ios/codesign.py"
+        deps = [ ":$_generate_info_plist" ]
+        if (defined(invoker.entitlements_target)) {
+          deps += [ invoker.entitlements_target ]
+        }
+        sources = [
+          _entitlements_path,
+          _info_plist_path,
+        ]
+        outputs = [ _generate_entitlements_output ]
+
+        args = [
+                 "generate-entitlements",
+                 "-e=" + rebase_path(_entitlements_path, root_build_dir),
+                 "-p=" + rebase_path(_info_plist_path, root_build_dir),
+               ] + rebase_path(outputs, root_build_dir)
+      }
+    }
+
+    # Only write PkgInfo for real application, not application extension.
+    if (_is_app_bundle) {
+      _create_pkg_info = target_name + "_pkg_info"
+      action(_create_pkg_info) {
+        forward_variables_from(invoker, [ "testonly" ])
+        script = "//build/apple/write_pkg_info.py"
+        inputs = [ "//build/apple/plist_util.py" ]
+        sources = get_target_outputs(":$_generate_info_plist")
+        outputs = [
+          # Cannot name the output PkgInfo as the name will not be unique if
+          # multiple ios_app_bundle are defined in the same BUILD.gn file. The
+          # file is renamed in the bundle_data outputs to the correct name.
+          "$target_gen_dir/$target_name",
+        ]
+        args = [ "--plist" ] + rebase_path(sources, root_build_dir) +
+               [ "--output" ] + rebase_path(outputs, root_build_dir)
+        deps = [ ":$_generate_info_plist" ]
+      }
+
+      _bundle_data_pkg_info = target_name + "_bundle_data_pkg_info"
+      bundle_data(_bundle_data_pkg_info) {
+        forward_variables_from(invoker, [ "testonly" ])
+        sources = get_target_outputs(":$_create_pkg_info")
+        outputs = [ "{{bundle_resources_dir}}/PkgInfo" ]
+        public_deps = [ ":$_create_pkg_info" ]
+      }
+    }
+
+    foreach(_variant, _variants) {
+      create_signed_bundle(_variant.target_name) {
+        forward_variables_from(invoker,
+                               [
+                                 "bundle_deps",
+                                 "bundle_deps_filter",
+                                 "data_deps",
+                                 "deps",
+                                 "enable_code_signing",
+                                 "entitlements_path",
+                                 "entitlements_target",
+                                 "extra_system_frameworks",
+                                 "public_configs",
+                                 "public_deps",
+                                 "testonly",
+                                 "visibility",
+                                 "xcode_extra_attributes",
+                               ])
+
+        output_name = _output_name
+        bundle_gen_dir = _variant.bundle_gen_dir
+        bundle_binary_target = ":$_lipo_executable_target"
+        bundle_binary_output = _output_name
+        bundle_extension = _bundle_extension
+        product_type = _product_type
+        xcode_product_bundle_id = _xcode_product_bundle_id
+
+        _generate_info_plist_outputs =
+            get_target_outputs(":$_generate_info_plist")
+        primary_info_plist = _generate_info_plist_outputs[0]
+        partial_info_plist =
+            "$target_gen_dir/${_variant.target_name}_partial_info.plist"
+
+        if (!defined(deps)) {
+          deps = []
+        }
+        deps += [ ":$_generate_info_plist" ]
+
+        if (!defined(bundle_deps)) {
+          bundle_deps = []
+        }
+        if (_is_app_bundle) {
+          bundle_deps += [ ":$_bundle_data_pkg_info" ]
+        }
+        bundle_deps += _variant.bundle_deps
+
+        if (target_environment == "simulator") {
+          if (!defined(data_deps)) {
+            data_deps = []
+          }
+          data_deps += [ "//testing/iossim" ]
+        }
+      }
+    }
+
+    if (_default_variant.name != "") {
+      _bundle_short_name = "$_output_name$_bundle_extension"
+      action(_target_name) {
+        forward_variables_from(invoker, [ "testonly" ])
+
+        script = "//build/config/ios/hardlink.py"
+        public_deps = []
+        foreach(_variant, _variants) {
+          public_deps += [ ":${_variant.target_name}" ]
+        }
+
+        sources = [ "${_default_variant.bundle_gen_dir}/$_bundle_short_name" ]
+        outputs = [ "$root_out_dir/$_bundle_short_name" ]
+
+        args = rebase_path(sources, root_build_dir) +
+               rebase_path(outputs, root_build_dir)
+      }
+    }
+  }
+
+  if (is_fat_secondary_toolchain) {
+    not_needed("*")
+  }
+}
+
+set_defaults("ios_app_bundle") {
+  configs = default_executable_configs
+}
+
+# Template to build an application extension bundle for iOS.
+#
+# This should be used instead of "executable" built-in target type on iOS.
+# As the template forward the generation of the application executable to
+# an "executable" target, all arguments supported by "executable" targets
+# are also supported by this template.
+#
+# Arguments
+#
+#   output_name:
+#       (optional) string, name of the generated application, if omitted,
+#       defaults to the target_name.
+#
+#   extra_substitutions:
+#       (optional) list of string in "key=value" format, each value will
+#       be used as an additional variable substitution rule when generating
+#       the application Info.plist
+#
+#   info_plist:
+#       (optional) string, path to the Info.plist file that will be used for
+#       the bundle.
+#
+#   info_plist_target:
+#       (optional) string, if the info_plist is generated from an action,
+#       rather than a regular source file, specify the target name in lieu
+#       of info_plist. The two arguments are mutually exclusive.
+#
+# For more information, see "gn help executable".
+template("ios_appex_bundle") {
+  ios_app_bundle(target_name) {
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "bundle_extension",
+                             "product_type",
+                           ])
+    product_type = _ios_xcode_appex_bundle_id
+  }
+}
+
+set_defaults("ios_appex_bundle") {
+  configs = [ "//build/config/ios:ios_extension_executable_flags" ]
+}
+
+# Template to compile .xib and .storyboard files.
+#
+# Arguments
+#
+#     sources:
+#         list of string, sources to compile
+#
+#     ibtool_flags:
+#         (optional) list of string, additional flags to pass to the ibtool
+template("compile_ib_files") {
+  action_foreach(target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "testonly",
+                             "visibility",
+                           ])
+    assert(defined(invoker.sources),
+           "sources must be specified for $target_name")
+    assert(defined(invoker.output_extension),
+           "output_extension must be specified for $target_name")
+
+    ibtool_flags = []
+    if (defined(invoker.ibtool_flags)) {
+      ibtool_flags = invoker.ibtool_flags
+    }
+
+    _output_extension = invoker.output_extension
+
+    script = "//build/config/ios/compile_ib_files.py"
+    sources = invoker.sources
+    outputs = [
+      "$target_gen_dir/$target_name/{{source_name_part}}.$_output_extension",
+    ]
+    args = [
+      "--input",
+      "{{source}}",
+      "--output",
+      rebase_path(
+          "$target_gen_dir/$target_name/{{source_name_part}}.$_output_extension",
+          root_build_dir),
+    ]
+    args += ibtool_flags
+  }
+}
+
+# Compile a xib or storyboard file and add it to a bundle_data so that it is
+# available at runtime in the bundle.
+#
+# Arguments
+#
+#   source:
+#       string, path of the xib or storyboard to compile.
+#
+# Forwards all variables to the bundle_data target.
+template("bundle_data_ib_file") {
+  assert(defined(invoker.source), "source needs to be defined for $target_name")
+
+  _source_extension = get_path_info(invoker.source, "extension")
+  assert(_source_extension == "xib" || _source_extension == "storyboard",
+         "source must be a .xib or .storyboard for $target_name")
+
+  _target_name = target_name
+  if (_source_extension == "xib") {
+    _compile_ib_file = target_name + "_compile_xib"
+    _output_extension = "nib"
+  } else {
+    _compile_ib_file = target_name + "_compile_storyboard"
+    _output_extension = "storyboardc"
+  }
+
+  compile_ib_files(_compile_ib_file) {
+    sources = [ invoker.source ]
+    output_extension = _output_extension
+    visibility = [ ":$_target_name" ]
+    ibtool_flags = [
+      "--minimum-deployment-target",
+      ios_deployment_target,
+      "--auto-activate-custom-fonts",
+      "--target-device",
+      "iphone",
+      "--target-device",
+      "ipad",
+    ]
+  }
+
+  bundle_data(_target_name) {
+    forward_variables_from(invoker, "*", [ "source" ])
+
+    if (!defined(public_deps)) {
+      public_deps = []
+    }
+    public_deps += [ ":$_compile_ib_file" ]
+
+    sources = get_target_outputs(":$_compile_ib_file")
+
+    outputs = [ "{{bundle_resources_dir}}/{{source_file_part}}" ]
+  }
+}
+
+# Compile a strings file and add it to a bundle_data so that it is available
+# at runtime in the bundle.
+#
+# Arguments
+#
+#   source:
+#       string, path of the strings file to compile.
+#
+#   output:
+#       string, path of the compiled file in the final bundle.
+#
+# Forwards all variables to the bundle_data target.
+template("bundle_data_strings") {
+  assert(defined(invoker.source), "source needs to be defined for $target_name")
+  assert(defined(invoker.output), "output needs to be defined for $target_name")
+
+  _source_extension = get_path_info(invoker.source, "extension")
+  assert(_source_extension == "strings",
+         "source must be a .strings for $target_name")
+
+  _target_name = target_name
+  _convert_target = target_name + "_compile_strings"
+
+  convert_plist(_convert_target) {
+    visibility = [ ":$_target_name" ]
+    source = invoker.source
+    output =
+        "$target_gen_dir/$_target_name/" + get_path_info(invoker.source, "file")
+    format = "binary1"
+  }
+
+  bundle_data(_target_name) {
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "source",
+                             "output",
+                           ])
+
+    if (!defined(public_deps)) {
+      public_deps = []
+    }
+    public_deps += [ ":$_convert_target" ]
+
+    sources = get_target_outputs(":$_convert_target")
+
+    outputs = [ invoker.output ]
+  }
+}
+
+# Template to package a shared library into an iOS framework bundle.
+#
+# By default, the bundle target this template generates does not link the
+# resulting framework into anything that depends on it. If a dependency wants
+# a link-time (as well as build-time) dependency on the framework bundle,
+# depend against "$target_name+link". If only the build-time dependency is
+# required (e.g., for copying into another bundle), then use "$target_name".
+#
+# Arguments
+#
+#     output_name:
+#         (optional) string, name of the generated framework without the
+#         .framework suffix. If omitted, defaults to target_name.
+#
+#     public_headers:
+#         (optional) list of paths to header file that needs to be copied
+#         into the framework bundle Headers subdirectory. If omitted or
+#         empty then the Headers subdirectory is not created.
+#
+#     sources
+#         (optional) list of files. Needs to be defined and non-empty if
+#         public_headers is defined and non-empty.
+#
+#   enable_code_signing
+#       (optional) boolean, control whether code signing is enabled or not,
+#       default to ios_enable_code_signing if not defined.
+#
+# This template provides two targets for the resulting framework bundle. The
+# link-time behavior varies depending on which of the two targets below is
+# added as a dependency:
+#   - $target_name only adds a build-time dependency. Targets that depend on
+#     it will not link against the framework.
+#   - $target_name+link adds a build-time and link-time dependency. Targets
+#     that depend on it will link against the framework.
+#
+# The build-time-only dependency is used for when a target needs to use the
+# framework either only for resources, or because the target loads it at run-
+# time, via dlopen() or NSBundle. The link-time dependency will cause the
+# dependee to have the framework loaded by dyld at launch.
+#
+# Example of build-time only dependency:
+#
+#     framework_bundle("CoreTeleportation") {
+#       sources = [ ... ]
+#     }
+#
+#     bundle_data("core_teleportation_bundle_data") {
+#       deps = [ ":CoreTeleportation" ]
+#       sources = [ "$root_out_dir/CoreTeleportation.framework" ]
+#       outputs = [ "{{bundle_contents_dir}}/Frameworks/{{source_file_part}}" ]
+#     }
+#
+#     app_bundle("GoatTeleporter") {
+#       sources = [ ... ]
+#       deps = [
+#         ":core_teleportation_bundle_data",
+#       ]
+#     }
+#
+# The GoatTeleporter.app will not directly link against
+# CoreTeleportation.framework, but it will be included in the bundle's
+# Frameworks directory.
+#
+# Example of link-time dependency:
+#
+#     framework_bundle("CoreTeleportation") {
+#       sources = [ ... ]
+#       ldflags = [
+#         "-install_name",
+#         "@executable_path/../Frameworks/$target_name.framework"
+#       ]
+#     }
+#
+#     bundle_data("core_teleportation_bundle_data") {
+#       deps = [ ":CoreTeleportation+link" ]
+#       sources = [ "$root_out_dir/CoreTeleportation.framework" ]
+#       outputs = [ "{{bundle_contents_dir}}/Frameworks/{{source_file_part}}" ]
+#     }
+#
+#     app_bundle("GoatTeleporter") {
+#       sources = [ ... ]
+#       deps = [
+#         ":core_teleportation_bundle_data",
+#       ]
+#     }
+#
+# Note that the framework is still copied to the app's bundle, but dyld will
+# load this library when the app is launched because it uses the "+link"
+# target as a dependency. This also requires that the framework set its
+# install_name so that dyld can locate it.
+#
+# See "gn help shared_library" for more information on arguments supported
+# by shared library target.
+template("ios_framework_bundle") {
+  _target_name = target_name
+  _output_name = target_name
+  if (defined(invoker.output_name)) {
+    _output_name = invoker.output_name
+  }
+
+  _has_public_headers =
+      defined(invoker.public_headers) && invoker.public_headers != []
+
+  _primary_toolchain = current_toolchain
+  if (is_fat_secondary_toolchain) {
+    _primary_toolchain = primary_fat_toolchain_name
+  }
+
+  # Public configs are not propagated across toolchain (see crbug.com/675224)
+  # so some configs have to be defined for both default_toolchain and all others
+  # toolchains when performing a fat build. Use "get_label_info" to construct
+  # the path since they need to be relative to the default_toolchain.
+
+  _default_toolchain_root_out_dir =
+      get_label_info("$_target_name($_primary_toolchain)", "root_out_dir")
+
+  _arch_shared_library_source = _target_name + "_arch_shared_library_sources"
+  _arch_shared_library_target = _target_name + "_arch_shared_library"
+  _lipo_shared_library_target = _target_name + "_shared_library"
+  _link_target_name = _target_name + "+link"
+
+  if (_has_public_headers) {
+    _default_toolchain_target_gen_dir =
+        get_label_info("$_target_name($_primary_toolchain)", "target_gen_dir")
+
+    _framework_headers_target = _target_name + "_framework_headers"
+
+    _headers_map_config = _target_name + "_headers_map"
+    _header_map_filename =
+        "$_default_toolchain_target_gen_dir/$_output_name.headers.hmap"
+    config(_headers_map_config) {
+      visibility = [
+        ":${_arch_shared_library_source}",
+        ":${_target_name}_signed_bundle",
+      ]
+      include_dirs = [ _header_map_filename ]
+    }
+  }
+
+  _framework_headers_config = _target_name + "_framework_headers_config"
+  config(_framework_headers_config) {
+    framework_dirs = [ _default_toolchain_root_out_dir ]
+  }
+
+  _framework_public_config = _target_name + "_public_config"
+  config(_framework_public_config) {
+    configs = [ ":$_framework_headers_config" ]
+    frameworks = [ "$_output_name.framework" ]
+  }
+
+  source_set(_arch_shared_library_source) {
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "bundle_deps",
+                             "bundle_deps_filter",
+                             "data_deps",
+                             "enable_code_signing",
+                             "extra_substitutions",
+                             "info_plist",
+                             "info_plist_target",
+                             "output_name",
+                             "public_configs",
+                             "visibility",
+                           ])
+
+    visibility = [ ":$_arch_shared_library_target" ]
+
+    if (_has_public_headers) {
+      configs += [ ":$_headers_map_config" ]
+
+      if (!defined(deps)) {
+        deps = []
+      }
+      deps += [ ":$_framework_headers_target($_primary_toolchain)" ]
+    }
+  }
+
+  shared_library(_arch_shared_library_target) {
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "bundle_deps",
+                             "bundle_deps_filter",
+                             "data_deps",
+                             "enable_code_signing",
+                             "extra_substitutions",
+                             "info_plist",
+                             "info_plist_target",
+                             "output_name",
+                             "sources",
+                             "public_configs",
+                             "visibility",
+                           ])
+
+    visibility = [ ":$_lipo_shared_library_target($_primary_toolchain)" ]
+    if (is_fat_secondary_toolchain) {
+      visibility += [
+        ":${_target_name}",
+        ":${_target_name}_signed_bundle",
+      ]
+    }
+
+    if (!defined(deps)) {
+      deps = []
+    }
+    deps += [ ":$_arch_shared_library_source" ]
+    if (_has_public_headers) {
+      deps += [ ":$_framework_headers_target($_primary_toolchain)" ]
+    }
+    if (!defined(ldflags)) {
+      ldflags = []
+    }
+    ldflags +=
+        [ "-Wl,-install_name,@rpath/$_output_name.framework/$_output_name" ]
+
+    output_extension = ""
+    output_name = _output_name
+    output_prefix_override = true
+    output_dir = "$target_out_dir/$target_cpu"
+  }
+
+  if (is_fat_secondary_toolchain) {
+    # For fat builds, only the default toolchain will generate a framework
+    # bundle. For the other toolchains, the template is only used for building
+    # the arch-specific binary, thus the default target is just a group().
+
+    group(_target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "visibility",
+                               "testonly",
+                             ])
+      public_deps = [ ":$_arch_shared_library_target" ]
+    }
+
+    group(_link_target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "public_configs",
+                               "visibility",
+                               "testonly",
+                             ])
+      public_deps = [ ":$_link_target_name($_primary_toolchain)" ]
+
+      if (_has_public_headers) {
+        if (!defined(public_configs)) {
+          public_configs = []
+        }
+        public_configs += [ ":$_framework_headers_config" ]
+      }
+      if (!defined(all_dependent_configs)) {
+        all_dependent_configs = []
+      }
+      all_dependent_configs += [ ":$_framework_public_config" ]
+    }
+
+    group("$_target_name+bundle") {
+      forward_variables_from(invoker, [ "testonly" ])
+      public_deps = [ ":$_target_name+bundle($_primary_toolchain)" ]
+    }
+
+    not_needed(invoker, "*")
+  } else {
+    if (_has_public_headers) {
+      _public_headers = invoker.public_headers
+
+      _framework_root_dir = "$root_out_dir/$_output_name.framework"
+      if (target_environment == "simulator" || target_environment == "device") {
+        _framework_contents_dir = _framework_root_dir
+      } else if (target_environment == "catalyst") {
+        _framework_contents_dir = "$_framework_root_dir/Versions/A"
+      }
+
+      _compile_headers_map_target = _target_name + "_compile_headers_map"
+      action(_compile_headers_map_target) {
+        visibility = [ ":$_framework_headers_target" ]
+        forward_variables_from(invoker,
+                               [
+                                 "deps",
+                                 "public_deps",
+                                 "testonly",
+                               ])
+        script = "//build/config/ios/write_framework_hmap.py"
+        outputs = [ _header_map_filename ]
+
+        # The header map generation only wants the list of headers, not all of
+        # sources, so filter any non-header source files from "sources". It is
+        # less error prone that having the developer duplicate the list of all
+        # headers in addition to "sources".
+        sources = []
+        foreach(_source, invoker.sources) {
+          if (get_path_info(_source, "extension") == "h") {
+            sources += [ _source ]
+          }
+        }
+
+        args = [
+                 rebase_path(_header_map_filename),
+                 rebase_path(_framework_root_dir, root_build_dir),
+               ] + rebase_path(sources, root_build_dir)
+      }
+
+      _create_module_map_target = _target_name + "_module_map"
+      action(_create_module_map_target) {
+        visibility = [ ":$_framework_headers_target" ]
+        script = "//build/config/ios/write_framework_modulemap.py"
+        outputs = [ "$_framework_contents_dir/Modules/module.modulemap" ]
+        args = [
+          _output_name,
+          rebase_path("$_framework_contents_dir/Modules", root_build_dir),
+        ]
+      }
+
+      _copy_public_headers_target = _target_name + "_copy_public_headers"
+      copy(_copy_public_headers_target) {
+        forward_variables_from(invoker,
+                               [
+                                 "testonly",
+                                 "deps",
+                               ])
+        visibility = [ ":$_framework_headers_target" ]
+        sources = _public_headers
+        outputs = [ "$_framework_contents_dir/Headers/{{source_file_part}}" ]
+
+        # Do not use forward_variables_from for "public_deps" as
+        # we do not want to forward those dependencies.
+        if (defined(invoker.public_deps)) {
+          if (!defined(deps)) {
+            deps = []
+          }
+          deps += invoker.public_deps
+        }
+      }
+
+      group(_framework_headers_target) {
+        forward_variables_from(invoker, [ "testonly" ])
+        deps = [
+          ":$_compile_headers_map_target",
+          ":$_create_module_map_target",
+        ]
+        public_deps = [ ":$_copy_public_headers_target" ]
+      }
+    }
+
+    lipo_binary(_lipo_shared_library_target) {
+      forward_variables_from(invoker,
+                             [
+                               "configs",
+                               "testonly",
+                             ])
+
+      visibility = [ ":${_target_name}_signed_bundle" ]
+      output_name = _output_name
+      arch_binary_target = ":$_arch_shared_library_target"
+      arch_binary_output = _output_name
+    }
+
+    _info_plist_target = _target_name + "_info_plist"
+    _info_plist_bundle = _target_name + "_info_plist_bundle"
+    ios_info_plist(_info_plist_target) {
+      visibility = [ ":$_info_plist_bundle" ]
+      executable_name = _output_name
+      forward_variables_from(invoker,
+                             [
+                               "extra_substitutions",
+                               "info_plist",
+                               "info_plist_target",
+                             ])
+    }
+
+    bundle_data(_info_plist_bundle) {
+      visibility = [ ":${_target_name}_signed_bundle" ]
+      forward_variables_from(invoker, [ "testonly" ])
+      sources = get_target_outputs(":$_info_plist_target")
+      public_deps = [ ":$_info_plist_target" ]
+
+      if (target_environment != "catalyst") {
+        outputs = [ "{{bundle_contents_dir}}/Info.plist" ]
+      } else {
+        outputs = [ "{{bundle_resources_dir}}/Info.plist" ]
+      }
+    }
+
+    create_signed_bundle(_target_name + "_signed_bundle") {
+      forward_variables_from(invoker,
+                             [
+                               "bundle_deps",
+                               "bundle_deps_filter",
+                               "data_deps",
+                               "deps",
+                               "enable_code_signing",
+                               "public_configs",
+                               "public_deps",
+                               "testonly",
+                               "visibility",
+                             ])
+
+      product_type = "com.apple.product-type.framework"
+      bundle_extension = ".framework"
+
+      output_name = _output_name
+      bundle_binary_target = ":$_lipo_shared_library_target"
+      bundle_binary_output = _output_name
+
+      has_public_headers = _has_public_headers
+
+      # Framework do not have entitlements nor mobileprovision because they use
+      # the one from the bundle using them (.app or .appex) as they are just
+      # dynamic library with shared code.
+      disable_entitlements = true
+      disable_embedded_mobileprovision = true
+
+      if (!defined(deps)) {
+        deps = []
+      }
+      deps += [ ":$_info_plist_bundle" ]
+    }
+
+    group(_target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "public_configs",
+                               "public_deps",
+                               "testonly",
+                               "visibility",
+                             ])
+      if (!defined(public_deps)) {
+        public_deps = []
+      }
+      public_deps += [ ":${_target_name}_signed_bundle" ]
+
+      if (_has_public_headers) {
+        if (!defined(public_configs)) {
+          public_configs = []
+        }
+        public_configs += [ ":$_framework_headers_config" ]
+      }
+    }
+
+    group(_link_target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "public_configs",
+                               "public_deps",
+                               "testonly",
+                               "visibility",
+                             ])
+      if (!defined(public_deps)) {
+        public_deps = []
+      }
+      public_deps += [ ":$_target_name" ]
+
+      if (!defined(all_dependent_configs)) {
+        all_dependent_configs = []
+      }
+      all_dependent_configs += [ ":$_framework_public_config" ]
+    }
+
+    bundle_data(_target_name + "+bundle") {
+      forward_variables_from(invoker,
+                             [
+                               "testonly",
+                               "visibility",
+                             ])
+      public_deps = [ ":$_target_name" ]
+      sources = [ "$root_out_dir/$_output_name.framework" ]
+      outputs = [ "{{bundle_contents_dir}}/Frameworks/$_output_name.framework" ]
+    }
+  }
+}
+
+set_defaults("ios_framework_bundle") {
+  configs = default_shared_library_configs
+}
+
+# Template to build a xctest bundle that contains a loadable module for iOS.
+#
+# Arguments
+#
+#   deps:
+#       list of labels to depends on, these values are used to create the
+#       loadable module.
+#
+#   product_type
+#       string, product type for the generated Xcode project, use
+#       "com.apple.product-type.bundle.unit-test" for unit test and
+#       "com.apple.product-type.bundle.ui-testing" for UI testing.
+#
+#   host_target:
+#       string, name of the target that depends on the generated bundle, this
+#       value is used to restrict visibilities.
+#
+#   xcode_test_application_name:
+#       string, name of the test application for Xcode unit or ui test target.
+#
+#   output_name
+#       (optional) string, name of the generated application, if omitted,
+#       defaults to the target_name.
+#
+# This template defines two targets, one named "${target_name}" is the xctest
+# bundle, and the other named "${target_name}_bundle" is a bundle_data that
+# wraps the xctest bundle and that only the "${host_target}" can depend on.
+#
+template("ios_xctest_bundle") {
+  assert(defined(invoker.deps), "deps must be defined for $target_name")
+  assert(defined(invoker.product_type),
+         "product_type must be defined for $target_name")
+  assert(invoker.product_type == _ios_xcode_xctest_bundle_id ||
+             invoker.product_type == _ios_xcode_xcuitest_bundle_id,
+         "product_type defined for $target_name is invalid.")
+  assert(defined(invoker.host_target),
+         "host_target must be defined for $target_name")
+  assert(defined(invoker.xcode_test_application_name),
+         "xcode_test_application_name must be defined for $target_name")
+
+  # Silence "assignment had no effect" error for non-default toolchains as
+  # following variables are only used in the expansion of the template for the
+  # default toolchain.
+  if (is_fat_secondary_toolchain) {
+    not_needed(invoker, "*")
+  }
+
+  _target_name = target_name
+  _output_name = target_name
+
+  if (defined(invoker.output_name)) {
+    _output_name = invoker.output_name
+  }
+
+  _arch_loadable_module_source = _target_name + "_arch_loadable_module_source"
+  _arch_loadable_module_target = _target_name + "_arch_loadable_module"
+  _lipo_loadable_module_target = _target_name + "_loadable_module"
+
+  _primary_toolchain = current_toolchain
+  if (is_fat_secondary_toolchain) {
+    _primary_toolchain = primary_fat_toolchain_name
+  }
+
+  source_set(_arch_loadable_module_source) {
+    forward_variables_from(invoker, [ "deps" ])
+
+    testonly = true
+    visibility = [ ":$_arch_loadable_module_target" ]
+  }
+
+  loadable_module(_arch_loadable_module_target) {
+    testonly = true
+    visibility = [ ":$_lipo_loadable_module_target($_primary_toolchain)" ]
+    if (is_fat_secondary_toolchain) {
+      visibility += [ ":$_target_name" ]
+    }
+
+    deps = [ ":$_arch_loadable_module_source" ]
+    configs += [ "//build/config/ios:xctest_config" ]
+
+    output_dir = "$target_out_dir/$target_cpu"
+    output_name = _output_name
+    output_prefix_override = true
+    output_extension = ""
+  }
+
+  if (is_fat_secondary_toolchain) {
+    # For fat builds, only the default toolchain will generate a test bundle.
+    # For the other toolchains, the template is only used for building the
+    # arch-specific binary, thus the default target is just a group().
+    group(_target_name) {
+      forward_variables_from(invoker, [ "visibility" ])
+      testonly = true
+
+      public_deps = [ ":$_arch_loadable_module_target" ]
+    }
+
+    not_needed(invoker, "*")
+  } else {
+    _info_plist_target = _target_name + "_info_plist"
+    _info_plist_bundle = _target_name + "_info_plist_bundle"
+
+    ios_info_plist(_info_plist_target) {
+      testonly = true
+      visibility = [ ":$_info_plist_bundle" ]
+
+      info_plist = "//build/config/ios/Module-Info.plist"
+      executable_name = _output_name
+
+      if (defined(invoker.xctest_bundle_principal_class)) {
+        _principal_class = invoker.xctest_bundle_principal_class
+      } else {
+        # Fall back to a reasonable default value.
+        _principal_class = "NSObject"
+      }
+      extra_substitutions = [
+        "XCTEST_BUNDLE_PRINCIPAL_CLASS=${_principal_class}",
+        "MODULE_BUNDLE_ID=gtest.$_output_name",
+      ]
+    }
+
+    bundle_data(_info_plist_bundle) {
+      testonly = true
+      visibility = [ ":$_target_name" ]
+
+      public_deps = [ ":$_info_plist_target" ]
+
+      sources = get_target_outputs(":$_info_plist_target")
+      outputs = [ "{{bundle_contents_dir}}/Info.plist" ]
+    }
+
+    lipo_binary(_lipo_loadable_module_target) {
+      forward_variables_from(invoker, [ "configs" ])
+
+      testonly = true
+      visibility = [ ":$_target_name" ]
+
+      output_name = _output_name
+      arch_binary_target = ":$_arch_loadable_module_target"
+      arch_binary_output = _output_name
+    }
+
+    _xctest_bundle = _target_name + "_bundle"
+    create_signed_bundle(_target_name) {
+      forward_variables_from(invoker,
+                             [
+                               "bundle_id",
+                               "data_deps",
+                               "enable_code_signing",
+                               "product_type",
+                               "xcode_test_application_name",
+                             ])
+
+      testonly = true
+      visibility = [ ":$_xctest_bundle" ]
+
+      bundle_extension = ".xctest"
+
+      output_name = _output_name
+      bundle_binary_target = ":$_lipo_loadable_module_target"
+      bundle_binary_output = _output_name
+
+      if (ios_set_attributes_for_xcode_project_generation) {
+        _xcode_product_bundle_id =
+            "$ios_app_bundle_id_prefix.gtest.$_output_name"
+
+        _ios_provisioning_profile_info =
+            exec_script("//build/config/ios/codesign.py",
+                        [
+                          "find-provisioning-profile",
+                          "-b=" + _xcode_product_bundle_id,
+                        ],
+                        "json")
+
+        xcode_extra_attributes = {
+          IPHONEOS_DEPLOYMENT_TARGET = ios_deployment_target
+          CODE_SIGN_IDENTITY = "iPhone Developer"
+          DEVELOPMENT_TEAM = _ios_provisioning_profile_info.team_identifier
+          PRODUCT_BUNDLE_IDENTIFIER = _xcode_product_bundle_id
+          PROVISIONING_PROFILE_SPECIFIER = _ios_provisioning_profile_info.name
+
+          # For XCUITest, Xcode requires specifying the host application name
+          # via the TEST_TARGET_NAME attribute.
+          if (invoker.product_type == _ios_xcode_xcuitest_bundle_id) {
+            TEST_TARGET_NAME = invoker.xcode_test_application_name
+          }
+
+          # For XCTest, Xcode requires specifying the host application path via
+          # both BUNDLE_LOADER and TEST_HOST attributes.
+          if (invoker.product_type == _ios_xcode_xctest_bundle_id) {
+            _xcode_app_name = invoker.xcode_test_application_name
+            if (defined(invoker.xcode_test_application_output_name)) {
+              _xcode_app_name = invoker.xcode_test_application_output_name
+            }
+
+            BUNDLE_LOADER = "\$(TEST_HOST)"
+            TEST_HOST = "\$(BUILT_PRODUCTS_DIR)/" +
+                        "${_xcode_app_name}.app/${_xcode_app_name}"
+          }
+        }
+      } else {
+        not_needed(invoker,
+                   [
+                     "xcode_test_application_name",
+                     "xcode_test_application_output_name",
+                   ])
+      }
+
+      deps = [ ":$_info_plist_bundle" ]
+    }
+
+    bundle_data(_xctest_bundle) {
+      forward_variables_from(invoker, [ "host_target" ])
+
+      testonly = true
+      visibility = [ ":$host_target" ]
+
+      public_deps = [ ":$_target_name" ]
+      sources = [ "$root_out_dir/$_output_name.xctest" ]
+      outputs = [ "{{bundle_contents_dir}}/PlugIns/$_output_name.xctest" ]
+    }
+  }
+}
+
+set_defaults("ios_xctest_bundle") {
+  configs = default_shared_library_configs
+}
+
+# For Chrome on iOS we want to run XCTests for all our build configurations
+# (Debug, Release, ...). In addition, the symbols visibility is configured to
+# private by default. To simplify testing with those constraints, our tests are
+# compiled in the TEST_HOST target instead of the .xctest bundle.
+template("ios_xctest_test") {
+  _target_name = target_name
+  _output_name = target_name
+  if (defined(invoker.output_name)) {
+    _output_name = invoker.output_name
+  }
+
+  _xctest_target = _target_name + "_module"
+  _xctest_output = _output_name + "_module"
+
+  _host_target = _target_name
+  _host_output = _output_name
+
+  # Allow invokers to specify their own target for the xctest module, but
+  # fall back to a default (empty) module otherwise.
+  if (defined(invoker.xctest_module_target)) {
+    _xctest_module_target = invoker.xctest_module_target
+  } else {
+    _xctest_module_target_name = _xctest_target + "shell_source"
+    _xctest_module_target = ":$_xctest_module_target_name"
+    source_set(_xctest_module_target_name) {
+      sources = [ "//build/config/ios/xctest_shell.mm" ]
+
+      configs += [ "//build/config/ios:xctest_config" ]
+    }
+  }
+
+  ios_xctest_bundle(_xctest_target) {
+    forward_variables_from(invoker, [ "data_deps" ])
+    output_name = _xctest_output
+    product_type = _ios_xcode_xctest_bundle_id
+    host_target = _host_target
+
+    # TODO(crbug.com/1056328) The change in output name results in a mismatch
+    # between this value and the ios_app_bundle target name. To mitigate, this
+    # has been modified to _host_target. output_name is set to _host_output
+    # to mitigate the naming.
+    xcode_test_application_name = _host_target
+    xcode_test_application_output_name = _host_output
+
+    deps = [ _xctest_module_target ]
+  }
+
+  ios_app_bundle(_host_target) {
+    forward_variables_from(invoker, "*", [ "testonly" ])
+
+    testonly = true
+    output_name = _host_output
+    configs += [ "//build/config/ios:xctest_config" ]
+
+    if (!defined(invoker.info_plist) && !defined(invoker.info_plist_target)) {
+      info_plist = "//build/config/ios/Host-Info.plist"
+    }
+
+    # Xcode needs the following frameworks installed in the application (and
+    # signed) for the XCTest to run, so install them using
+    # extra_system_frameworks.
+    extra_system_frameworks = [
+      "$ios_sdk_platform_path/Developer/Library/Frameworks/XCTest.framework",
+      "$ios_sdk_platform_path/Developer/Library/PrivateFrameworks/XCTAutomationSupport.framework",
+      "$ios_sdk_platform_path/Developer/usr/lib/libXCTestBundleInject.dylib",
+    ]
+
+    # Xcode 13 now depends on XCTestCore. To keep things future proof, copy over
+    # everything that Xcode copies.
+    if (xcode_version_int >= 1300) {
+      extra_system_frameworks += [
+        "$ios_sdk_platform_path/Developer/Library/PrivateFrameworks/XCTestCore.framework",
+        "$ios_sdk_platform_path/Developer/Library/PrivateFrameworks/XCUIAutomation.framework",
+        "$ios_sdk_platform_path/Developer/Library/PrivateFrameworks/XCUnit.framework",
+        "$ios_sdk_platform_path/Developer/usr/lib/libXCTestSwiftSupport.dylib",
+      ]
+    }
+
+    _xctest_bundle = _xctest_target + "_bundle"
+    if (!is_fat_secondary_toolchain) {
+      if (!defined(bundle_deps)) {
+        bundle_deps = []
+      }
+      bundle_deps += [ ":$_xctest_bundle" ]
+    }
+  }
+}
+
+set_defaults("ios_xctest_test") {
+  configs = default_executable_configs
+}
+
+# Template to build a xcuitest test runner bundle.
+#
+# Xcode requires a test runner application with a copy of the XCTest dynamic
+# library bundle in it for the XCUITest to run. The test runner bundle is created
+# by copying the system bundle XCTRunner.app from Xcode SDK with the plist file
+# being properly tweaked, and a xctest and it needs to be code signed in order
+# to run on devices.
+#
+# Arguments
+#
+#   xctest_bundle
+#       string, name of the dependent xctest bundle target.
+#
+#   output_name
+#       (optional) string, name of the generated application, if omitted,
+#       defaults to the target_name.
+#
+template("ios_xcuitest_test_runner_bundle") {
+  assert(defined(invoker.xctest_bundle),
+         "xctest_bundle must be defined for $target_name")
+
+  _target_name = target_name
+  _output_name = target_name
+  if (defined(invoker.output_name)) {
+    _output_name = invoker.output_name
+  }
+
+  _xctrunner_path =
+      "$ios_sdk_platform_path/Developer/Library/Xcode/Agents/XCTRunner.app"
+
+  _info_plist_merge_plist = _target_name + "_info_plist_merge_plist"
+  _info_plist_target = _target_name + "_info_plist"
+  _info_plist_bundle = _target_name + "_info_plist_bundle"
+
+  action(_info_plist_merge_plist) {
+    testonly = true
+    script = "//build/apple/plist_util.py"
+
+    sources = [
+      "$_xctrunner_path/Info.plist",
+
+      # NOTE: The XCTRunnerAddition+Info.plist must come after the Info.plist
+      # because it overrides the values under "CFBundleIdentifier" and
+      # "CFBundleName".
+      "//build/config/ios/resources/XCTRunnerAddition+Info.plist",
+    ]
+
+    _output_name = "$target_gen_dir/${_target_name}_merged.plist"
+    outputs = [ _output_name ]
+    args = [
+             "merge",
+             "-f=xml1",
+             "-x=$xcode_version",
+             "-o=" + rebase_path(_output_name, root_build_dir),
+           ] + rebase_path(sources, root_build_dir)
+
+    if (use_system_xcode && use_goma) {
+      deps = [ "//build/config/ios:copy_xctrunner_app" ]
+    }
+  }
+
+  ios_info_plist(_info_plist_target) {
+    testonly = true
+    visibility = [ ":$_info_plist_bundle" ]
+
+    executable_name = _output_name
+    info_plist_target = ":$_info_plist_merge_plist"
+  }
+
+  bundle_data(_info_plist_bundle) {
+    testonly = true
+    visibility = [ ":$_target_name" ]
+
+    public_deps = [ ":$_info_plist_target" ]
+
+    sources = get_target_outputs(":$_info_plist_target")
+    outputs = [ "{{bundle_contents_dir}}/Info.plist" ]
+  }
+
+  _pkginfo_bundle = _target_name + "_pkginfo_bundle"
+  bundle_data(_pkginfo_bundle) {
+    testonly = true
+    visibility = [ ":$_target_name" ]
+
+    sources = [ "$_xctrunner_path/PkgInfo" ]
+
+    outputs = [ "{{bundle_contents_dir}}/PkgInfo" ]
+
+    if (use_system_xcode && use_goma) {
+      public_deps = [ "//build/config/ios:copy_xctrunner_app" ]
+    }
+  }
+
+  _xctest_bundle = invoker.xctest_bundle
+  create_signed_bundle(_target_name) {
+    testonly = true
+
+    bundle_binary_target = "//build/config/ios:xctest_runner_without_arm64e"
+    bundle_binary_output = "XCTRunner"
+    bundle_extension = ".app"
+    product_type = _ios_xcode_app_bundle_id
+
+    output_name = _output_name
+
+    # Xcode needs the following frameworks installed in the application
+    # (and signed) for the XCUITest to run, so install them using
+    # extra_system_frameworks.
+    extra_system_frameworks = [
+      "$ios_sdk_platform_path/Developer/Library/Frameworks/XCTest.framework",
+      "$ios_sdk_platform_path/Developer/Library/PrivateFrameworks/XCTAutomationSupport.framework",
+    ]
+
+    # Xcode 13 now depends on XCTestCore. To keep things future proof, copy over
+    # everything that Xcode copies.
+    if (xcode_version_int >= 1300) {
+      extra_system_frameworks += [
+        "$ios_sdk_platform_path/Developer/Library/PrivateFrameworks/XCTestCore.framework",
+        "$ios_sdk_platform_path/Developer/Library/PrivateFrameworks/XCUIAutomation.framework",
+        "$ios_sdk_platform_path/Developer/Library/PrivateFrameworks/XCUnit.framework",
+        "$ios_sdk_platform_path/Developer/usr/lib/libXCTestSwiftSupport.dylib",
+      ]
+    }
+
+    bundle_deps = []
+    if (defined(invoker.bundle_deps)) {
+      bundle_deps += invoker.bundle_deps
+    }
+    bundle_deps += [
+      ":$_info_plist_bundle",
+      ":$_pkginfo_bundle",
+      ":$_xctest_bundle",
+    ]
+  }
+}
+
+# Template to build a XCUITest that consists of two parts: the test runner
+# application bundle and the xctest dynamic library.
+#
+# Arguments
+#
+#   deps:
+#       list of labels to depends on, these values are used to create the
+#       xctest dynamic library.
+#
+#   xcode_test_application_name:
+#       string, name of the test application for the ui test target.
+#
+# This template defines two targets, one named "${target_name}_module" is the
+# xctest dynamic library, and the other named "${target_name}_runner" is the
+# test runner application bundle.
+#
+template("ios_xcuitest_test") {
+  assert(defined(invoker.deps), "deps must be defined for $target_name")
+  assert(defined(invoker.xcode_test_application_name),
+         "xcode_test_application_name must be defined for $target_name")
+
+  _xcuitest_target = target_name
+  if (defined(invoker.output_name)) {
+    _xcuitest_target = invoker.output_name
+  }
+
+  _xcuitest_runner_target = _xcuitest_target + "_runner"
+  _xcuitest_module_target = _xcuitest_target + "_module"
+
+  group(target_name) {
+    testonly = true
+
+    deps = [ ":$_xcuitest_runner_target" ]
+  }
+
+  _xcuitest_module_output = _xcuitest_target
+  ios_xctest_bundle(_xcuitest_module_target) {
+    forward_variables_from(invoker,
+                           [
+                             "xcode_test_application_name",
+                             "xctest_bundle_principal_class",
+                             "data_deps",
+                           ])
+
+    product_type = _ios_xcode_xcuitest_bundle_id
+    host_target = _xcuitest_runner_target
+    output_name = _xcuitest_module_output
+
+    deps = invoker.deps
+  }
+
+  _xcuitest_runner_output = _xcuitest_target + "-Runner"
+  ios_xcuitest_test_runner_bundle(_xcuitest_runner_target) {
+    output_name = _xcuitest_runner_output
+    xctest_bundle = _xcuitest_module_target + "_bundle"
+    forward_variables_from(invoker, [ "bundle_deps" ])
+  }
+}
+
+set_defaults("ios_xcuitest_test") {
+  configs = default_executable_configs
+}
diff --git a/third_party/libwebrtc/build/config/ios/strip_arm64e.py b/third_party/libwebrtc/build/config/ios/strip_arm64e.py
new file mode 100644
index 0000000000..f21baf423d
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/strip_arm64e.py
@@ -0,0 +1,70 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+"""Strip arm64e architecture from a binary if present."""
+
+import argparse
+import os
+import shutil
+import subprocess
+import sys
+
+
+def check_output(command):
+  """Returns the output from |command| or propagates error, quitting script."""
+  process = subprocess.Popen(
+      command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+  outs, errs = process.communicate()
+  if process.returncode:
+    sys.stderr.write('error: command failed with retcode %d: %s\n\n' %
+                     (process.returncode, ' '.join(map(repr, command))))
+    sys.stderr.write(errs.decode('UTF-8', errors='ignore'))
+    sys.exit(process.returncode)
+  return outs.decode('UTF-8')
+
+
+def check_call(command):
+  """Invokes |command| or propagates error."""
+  check_output(command)
+
+
+def parse_args(args):
+  """Parses the command-line."""
+  parser = argparse.ArgumentParser()
+  parser.add_argument('--input', required=True, help='Path to input binary')
+  parser.add_argument('--output', required=True, help='Path to output binary')
+  parser.add_argument('--xcode-version', required=True, help='Version of Xcode')
+  return parser.parse_args(args)
+
+
+def get_archs(path):
+  """Extracts the architectures present in binary at |path|."""
+  outputs = check_output(["xcrun", "lipo", "-info", os.path.abspath(path)])
+  return outputs.split(': ')[-1].split()
+
+
+def main(args):
+  parsed = parse_args(args)
+
+  outdir = os.path.dirname(parsed.output)
+  if not os.path.isdir(outdir):
+    os.makedirs(outdir)
+
+  if os.path.exists(parsed.output):
+    os.unlink(parsed.output)
+
+  # As "lipo" fails with an error if asked to remove an architecture that is
+  # not included, only use it if "arm64e" is present in the binary. Otherwise
+  # simply copy the file.
+  if 'arm64e' in get_archs(parsed.input):
+    check_output([
+        "xcrun", "lipo", "-remove", "arm64e", "-output",
+        os.path.abspath(parsed.output),
+        os.path.abspath(parsed.input)
+    ])
+  else:
+    shutil.copy(parsed.input, parsed.output)
+
+
+if __name__ == '__main__':
+  main(sys.argv[1:])
diff --git a/third_party/libwebrtc/build/config/ios/write_framework_hmap.py b/third_party/libwebrtc/build/config/ios/write_framework_hmap.py
new file mode 100644
index 0000000000..ac467ee92a
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/write_framework_hmap.py
@@ -0,0 +1,103 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from __future__ import print_function
+
+import os
+import struct
+import sys
+
+def Main(args):
+  if len(args) < 4:
+    print(
+        "Usage: %s output.hmap Foo.framework header1.h..." % args[0],
+        file=sys.stderr)
+    return 1
+
+  (out, framework, all_headers) = args[1], args[2], args[3:]
+
+  framework_name = os.path.basename(framework).split('.')[0]
+  all_headers = map(os.path.abspath, all_headers)
+  filelist = {}
+  for header in all_headers:
+    filename = os.path.basename(header)
+    filelist[filename] = header
+    filelist[os.path.join(framework_name, filename)] = header
+  WriteHmap(out, filelist)
+  return 0
+
+
+def NextGreaterPowerOf2(x):
+  return 2**(x).bit_length()
+
+
+def WriteHmap(output_name, filelist):
+  """Generates a header map based on |filelist|.
+
+  Per Mark Mentovai:
+    A header map is structured essentially as a hash table, keyed by names used
+    in #includes, and providing pathnames to the actual files.
+
+  The implementation below and the comment above comes from inspecting:
+    http://www.opensource.apple.com/source/distcc/distcc-2503/distcc_dist/include_server/headermap.py?txt
+  while also looking at the implementation in clang in:
+    https://llvm.org/svn/llvm-project/cfe/trunk/lib/Lex/HeaderMap.cpp
+  """
+  magic = 1751998832
+  version = 1
+  _reserved = 0
+  count = len(filelist)
+  capacity = NextGreaterPowerOf2(count)
+  strings_offset = 24 + (12 * capacity)
+  max_value_length = len(max(filelist.values(), key=lambda v: len(v)))
+
+  out = open(output_name, 'wb')
+  out.write(struct.pack('<LHHLLLL', magic, version, _reserved, strings_offset,
+                        count, capacity, max_value_length))
+
+  # Create empty hashmap buckets.
+  buckets = [None] * capacity
+  for file, path in filelist.items():
+    key = 0
+    for c in file:
+      key += ord(c.lower()) * 13
+
+    # Fill next empty bucket.
+    while buckets[key & capacity - 1] is not None:
+      key = key + 1
+    buckets[key & capacity - 1] = (file, path)
+
+  next_offset = 1
+  for bucket in buckets:
+    if bucket is None:
+      out.write(struct.pack('<LLL', 0, 0, 0))
+    else:
+      (file, path) = bucket
+      key_offset = next_offset
+      prefix_offset = key_offset + len(file) + 1
+      suffix_offset = prefix_offset + len(os.path.dirname(path) + os.sep) + 1
+      next_offset = suffix_offset + len(os.path.basename(path)) + 1
+      out.write(struct.pack('<LLL', key_offset, prefix_offset, suffix_offset))
+
+  # Pad byte since next offset starts at 1.
+  out.write(struct.pack('<x'))
+
+  for bucket in buckets:
+    if bucket is not None:
+      (file, path) = bucket
+      base = os.path.dirname(path) + os.sep
+      path = os.path.basename(path)
+      file = file.encode('UTF-8')
+      base = base.encode('UTF-8')
+      path = path.encode('UTF-8')
+      out.write(struct.pack('<%ds' % len(file), file))
+      out.write(struct.pack('<s', b'\0'))
+      out.write(struct.pack('<%ds' % len(base), base))
+      out.write(struct.pack('<s', b'\0'))
+      out.write(struct.pack('<%ds' % len(path), path))
+      out.write(struct.pack('<s', b'\0'))
+
+
+if __name__ == '__main__':
+  sys.exit(Main(sys.argv))
diff --git a/third_party/libwebrtc/build/config/ios/write_framework_modulemap.py b/third_party/libwebrtc/build/config/ios/write_framework_modulemap.py
new file mode 100644
index 0000000000..dcc88a8ea6
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/write_framework_modulemap.py
@@ -0,0 +1,28 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import sys
+
+MODULE_MAP_TEMPLATE = '''\
+framework module %(framework_name)s {
+  umbrella header "%(framework_name)s.h"
+
+  export *
+  module * { export * }
+}
+'''
+
+
+def Main(framework_name, modules_dir):
+  # Find the name of the binary based on the part before the ".framework".
+  if not os.path.isdir(modules_dir):
+    os.makedirs(modules_dir)
+
+  with open(os.path.join(modules_dir, 'module.modulemap'), 'w') as module_file:
+    module_file.write(MODULE_MAP_TEMPLATE % {'framework_name': framework_name})
+
+
+if __name__ == '__main__':
+  Main(*sys.argv[1:])
diff --git a/third_party/libwebrtc/build/config/ios/xctest_shell.mm b/third_party/libwebrtc/build/config/ios/xctest_shell.mm
new file mode 100644
index 0000000000..dcf5bad5e7
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ios/xctest_shell.mm
@@ -0,0 +1,19 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <UIKit/UIKit.h>
+#import <XCTest/XCTest.h>
+
+// For Chrome on iOS we want to run EarlGrey tests (that are XCTests) for all
+// our build configurations (Debug, Release, ...). In addition, the symbols
+// visibility is configured to private by default. To simplify testing with
+// those constraints, our tests are compiled in the TEST_HOST target instead
+// of the .xctest bundle that all link against this single test (just there to
+// ensure that the bundle is not empty).
+
+@interface XCTestShellEmptyClass : NSObject
+@end
+
+@implementation XCTestShellEmptyClass
+@end
diff --git a/third_party/libwebrtc/build/config/linux/BUILD.gn b/third_party/libwebrtc/build/config/linux/BUILD.gn
new file mode 100644
index 0000000000..c036e4ae94
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/BUILD.gn
@@ -0,0 +1,79 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("../../../webrtc.gni")
+
+import("//build/config/c++/c++.gni")
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/config/linux/pkg_config.gni")
+import("//build/config/ui.gni")
+
+group("linux") {
+  visibility = [ "//:optimize_gn_gen" ]
+}
+
+# This is included by reference in the //build/config/compiler config that
+# is applied to all targets. It is here to separate out the logic that is
+# Linux-only. This is not applied to Android, but is applied to ChromeOS.
+config("compiler") {
+  if (target_cpu == "arm64") {
+    import("//build/config/arm.gni")
+    cflags = []
+    asmflags = []
+    if (arm_control_flow_integrity == "standard") {
+      cflags += [ "-mbranch-protection=standard" ]
+      asmflags += [ "-mbranch-protection=standard" ]
+    }
+  }
+}
+
+# This is included by reference in the //build/config/compiler:runtime_library
+# config that is applied to all targets. It is here to separate out the logic
+# that is Linux-only. Please see that target for advice on what should go in
+# :runtime_library vs. :compiler.
+config("runtime_library") {
+  # Set here because OS_CHROMEOS cannot be autodetected in build_config.h like
+  # OS_LINUX and the like.
+  if (is_chromeos) {
+    defines = [ "OS_CHROMEOS" ]
+  }
+
+  if ((!(is_chromeos_ash || is_chromeos_lacros) ||
+       default_toolchain != "//build/toolchain/cros:target") &&
+      (!use_custom_libcxx || target_cpu == "mipsel") && !build_with_mozilla) {
+    libs = [ "atomic" ]
+  }
+}
+
+config("libcap") {
+  libs = [ "cap" ]
+}
+
+config("libresolv") {
+  libs = [ "resolv" ]
+}
+
+if (false && use_glib) {
+  pkg_config("glib") {
+    packages = [
+      "glib-2.0",
+      "gmodule-2.0",
+      "gobject-2.0",
+      "gthread-2.0",
+    ]
+    defines = [
+      "GLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_40",
+      "GLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_40",
+    ]
+  }
+}
+
+# Ensures all exported symbols are added to the dynamic symbol table.  This is
+# necessary to expose Chrome's custom operator new() and operator delete() (and
+# other memory-related symbols) to libraries.  Otherwise, they might
+# (de)allocate memory on a different heap, which would spell trouble if pointers
+# to heap-allocated memory are passed over shared library boundaries.
+config("export_dynamic") {
+  ldflags = [ "-rdynamic" ]
+}
diff --git a/third_party/libwebrtc/build/config/linux/OWNERS b/third_party/libwebrtc/build/config/linux/OWNERS
new file mode 100644
index 0000000000..280ba478dc
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/OWNERS
@@ -0,0 +1 @@
+thomasanderson@chromium.org
diff --git a/third_party/libwebrtc/build/config/linux/atk/BUILD.gn b/third_party/libwebrtc/build/config/linux/atk/BUILD.gn
new file mode 100644
index 0000000000..92baff2a9b
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/atk/BUILD.gn
@@ -0,0 +1,35 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/config/features.gni")
+import("//build/config/linux/pkg_config.gni")
+import("//build/config/ui.gni")
+
+# CrOS doesn't install GTK or any gnome packages.
+assert(!is_chromeos)
+
+# These packages should _only_ be expected when building for a target.
+assert(current_toolchain == default_toolchain)
+
+if (use_atk) {
+  assert(use_glib, "use_atk=true requires that use_glib=true")
+}
+
+pkg_config("atk") {
+  packages = [
+    "atk",
+    "atk-bridge-2.0",
+  ]
+  atk_lib_dir = exec_script(pkg_config_script,
+                            pkg_config_args + [
+                                  "--libdir",
+                                  "atk",
+                                ],
+                            "string")
+  defines = [
+    "ATK_LIB_DIR=\"$atk_lib_dir\"",
+    "USE_ATK_BRIDGE",
+  ]
+}
diff --git a/third_party/libwebrtc/build/config/linux/atspi2/BUILD.gn b/third_party/libwebrtc/build/config/linux/atspi2/BUILD.gn
new file mode 100644
index 0000000000..988a995681
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/atspi2/BUILD.gn
@@ -0,0 +1,29 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/linux/pkg_config.gni")
+import("//build/config/ui.gni")
+
+# These packages should _only_ be expected when building for a target.
+assert(current_toolchain == default_toolchain)
+
+if (use_atk) {
+  pkg_config("atspi2") {
+    packages = [ "atspi-2" ]
+    atspi_version = exec_script(pkg_config_script,
+                                pkg_config_args + [
+                                      "atspi-2",
+                                      "--version-as-components",
+                                    ],
+                                "value")
+    atspi_major_version = atspi_version[0]
+    atspi_minor_version = atspi_version[1]
+    atspi_micro_version = atspi_version[2]
+    defines = [
+      "ATSPI_MAJOR_VERSION=$atspi_major_version",
+      "ATSPI_MINOR_VERSION=$atspi_minor_version",
+      "ATSPI_MICRO_VERSION=$atspi_micro_version",
+    ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/linux/dbus/BUILD.gn b/third_party/libwebrtc/build/config/linux/dbus/BUILD.gn
new file mode 100644
index 0000000000..f11cf7101c
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/dbus/BUILD.gn
@@ -0,0 +1,14 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/features.gni")
+import("//build/config/linux/pkg_config.gni")
+
+assert(use_dbus)
+
+# Note: if your target also depends on //dbus, you don't need to add this
+# config (it will get added automatically if you depend on //dbus).
+pkg_config("dbus") {
+  packages = [ "dbus-1" ]
+}
diff --git a/third_party/libwebrtc/build/config/linux/dri/BUILD.gn b/third_party/libwebrtc/build/config/linux/dri/BUILD.gn
new file mode 100644
index 0000000000..cad883b76d
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/dri/BUILD.gn
@@ -0,0 +1,18 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/linux/pkg_config.gni")
+
+assert(is_linux, "This file should only be referenced on Linux")
+
+pkg_config("dri") {
+  packages = [ "dri" ]
+  dri_driver_dir = exec_script(pkg_config_script,
+                               pkg_config_args + [
+                                     "--dridriverdir",
+                                     "dri",
+                                   ],
+                               "string")
+  defines = [ "DRI_DRIVER_DIR=\"$dri_driver_dir\"" ]
+}
diff --git a/third_party/libwebrtc/build/config/linux/gtk/BUILD.gn b/third_party/libwebrtc/build/config/linux/gtk/BUILD.gn
new file mode 100644
index 0000000000..6590023971
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/gtk/BUILD.gn
@@ -0,0 +1,69 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/linux/gtk/gtk.gni")
+import("//build/config/linux/pkg_config.gni")
+
+assert(is_linux, "This file should only be referenced on Linux")
+
+declare_args() {
+  # The (major) version of GTK to build against.  A different version may be
+  # loaded at runtime.
+  gtk_version = 3
+}
+
+# GN doesn't check visibility for configs so we give this an obviously internal
+# name to discourage random targets from accidentally depending on this and
+# bypassing the GTK target's visibility.
+pkg_config("gtk_internal_config") {
+  # Gtk requires gmodule, but it does not list it as a dependency in some
+  # misconfigured systems.
+  packages = [
+    "gmodule-2.0",
+    "gthread-2.0",
+  ]
+  if (gtk_version == 3) {
+    packages += [ "gtk+-3.0" ]
+  } else {
+    assert(gtk_version == 4)
+    packages += [ "gtk4" ]
+  }
+}
+
+group("gtk") {
+  visibility = [
+    # This is the only target that can depend on GTK.  Do not add more targets
+    # to this list.
+    "//ui/gtk:gtk_stubs",
+
+    # These are allow-listed for WebRTC builds.
+    "//examples:peerconnection_client",
+    "//remoting/host:common",
+    "//remoting/host:remoting_me2me_host_static",
+    "//remoting/host/file_transfer",
+    "//remoting/host/it2me:common",
+    "//remoting/host/it2me:remote_assistance_host",
+    "//remoting/host/linux",
+    "//remoting/host/remote_open_url:common",
+    "//remoting/test:it2me_standalone_host_main",
+    "//webrtc/examples:peerconnection_client",
+  ]
+
+  public_configs = [ ":gtk_internal_config" ]
+}
+
+# Depend on "gtkprint" to get this.
+pkg_config("gtkprint_internal_config") {
+  if (gtk_version == 3) {
+    packages = [ "gtk+-unix-print-3.0" ]
+  } else {
+    assert(gtk_version == 4)
+    packages = [ "gtk4-unix-print" ]
+  }
+}
+
+group("gtkprint") {
+  visibility = [ "//ui/gtk:*" ]
+  public_configs = [ ":gtkprint_internal_config" ]
+}
diff --git a/third_party/libwebrtc/build/config/linux/gtk/gtk.gni b/third_party/libwebrtc/build/config/linux/gtk/gtk.gni
new file mode 100644
index 0000000000..70cb823154
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/gtk/gtk.gni
@@ -0,0 +1,10 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/ui.gni")
+
+declare_args() {
+  # Whether or not we should use libgtk.
+  use_gtk = (is_linux || is_bsd) && !is_chromecast
+}
diff --git a/third_party/libwebrtc/build/config/linux/libdrm/BUILD.gn b/third_party/libwebrtc/build/config/linux/libdrm/BUILD.gn
new file mode 100644
index 0000000000..79695cbc60
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/libdrm/BUILD.gn
@@ -0,0 +1,31 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+import("//build/config/chromecast_build.gni")
+import("//build/config/chromeos/args.gni")
+import("//build/config/linux/pkg_config.gni")
+
+assert(is_linux || is_chromeos)
+
+declare_args() {
+  # Controls whether the build should use the version of libdrm library shipped
+  # with the system. In release builds of desktop Linux and Chrome OS we use the
+  # system version. Some Chromecast devices use this as well.
+  use_system_libdrm = is_chromeos_device || ((is_linux || is_bsd) && !is_chromecast)
+}
+
+if (use_system_libdrm) {
+  pkg_config("libdrm_config") {
+    packages = [ "libdrm" ]
+  }
+  group("libdrm") {
+    public_configs = [ ":libdrm_config" ]
+  }
+} else {
+  group("libdrm") {
+    public_deps = [ "//third_party/libdrm" ]
+  }
+  config("libdrm_exynos_include_config") {
+    include_dirs = [ "//third_party/libdrm/src/exynos" ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/linux/libffi/BUILD.gn b/third_party/libwebrtc/build/config/linux/libffi/BUILD.gn
new file mode 100644
index 0000000000..fb4fa18bf7
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/libffi/BUILD.gn
@@ -0,0 +1,18 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/linux/pkg_config.gni")
+
+if (default_toolchain == "//build/toolchain/cros:target") {
+  pkg_config("libffi") {
+    packages = [ "libffi" ]
+  }
+} else {
+  # On Linux, statically link libffi.  This is necessary to prevent a situation
+  # where the runtime version of libffi is different from the build-time version
+  # from the sysroot.
+  config("libffi") {
+    libs = [ ":libffi_pic.a" ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/linux/libva/BUILD.gn b/third_party/libwebrtc/build/config/linux/libva/BUILD.gn
new file mode 100644
index 0000000000..ada5d665fb
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/libva/BUILD.gn
@@ -0,0 +1,17 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/linux/pkg_config.gni")
+
+assert(is_linux || is_chromeos, "This file should only be referenced on Linux")
+
+pkg_config("libva") {
+  packages = [ "libva" ]
+
+  # Do not use exec_script to check the version here. It is done with a
+  # static_assert instead.
+
+  # vaapi decoders use dlopen pre-sandbox anyway to improve startup times.
+  ignore_libs = true
+}
diff --git a/third_party/libwebrtc/build/config/linux/nss/BUILD.gn b/third_party/libwebrtc/build/config/linux/nss/BUILD.gn
new file mode 100644
index 0000000000..8c27938b76
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/nss/BUILD.gn
@@ -0,0 +1,22 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/linux/pkg_config.gni")
+
+if (is_linux || is_chromeos) {
+  # This is a dependency on NSS with no libssl. On Linux we use a built-in SSL
+  # library but the system NSS libraries. Non-Linux platforms using NSS use the
+  # hermetic one in //third_party/nss.
+  #
+  # Generally you should depend on //crypto:platform instead of using this
+  # config since that will properly pick up NSS or OpenSSL depending on
+  # platform and build config.
+  pkg_config("system_nss_no_ssl_config") {
+    packages = [ "nss" ]
+    extra_args = [
+      "-v",
+      "-lssl3",
+    ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/linux/pangocairo/BUILD.gn b/third_party/libwebrtc/build/config/linux/pangocairo/BUILD.gn
new file mode 100644
index 0000000000..ddcc754bbd
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/pangocairo/BUILD.gn
@@ -0,0 +1,19 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/linux/pangocairo/pangocairo.gni")
+import("//build/config/linux/pkg_config.gni")
+
+if (use_pangocairo) {
+  pkg_config("pangocairo") {
+    packages = [ "pangocairo" ]
+
+    # We don't want pkgconfig for pangocairo to explicitly request FreeType to get
+    # linked, because we control which FreeType to link to.
+    extra_args = [
+      "-v",
+      "freetype",
+    ]
+  }
+}
diff --git a/third_party/libwebrtc/build/config/linux/pangocairo/pangocairo.gni b/third_party/libwebrtc/build/config/linux/pangocairo/pangocairo.gni
new file mode 100644
index 0000000000..6bc75294cd
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/pangocairo/pangocairo.gni
@@ -0,0 +1,10 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/config/ui.gni")
+
+declare_args() {
+  use_pangocairo = is_linux && !is_chromecast
+}
diff --git a/third_party/libwebrtc/build/config/linux/pkg-config.py b/third_party/libwebrtc/build/config/linux/pkg-config.py
new file mode 100755
index 0000000000..5adf70cc3b
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/pkg-config.py
@@ -0,0 +1,248 @@
+#!/usr/bin/env python
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from __future__ import print_function
+
+import json
+import os
+import subprocess
+import sys
+import re
+from optparse import OptionParser
+
+# This script runs pkg-config, optionally filtering out some results, and
+# returns the result.
+#
+# The result will be [ <includes>, <cflags>, <libs>, <lib_dirs>, <ldflags> ]
+# where each member is itself a list of strings.
+#
+# You can filter out matches using "-v <regexp>" where all results from
+# pkgconfig matching the given regular expression will be ignored. You can
+# specify more than one regular expression my specifying "-v" more than once.
+#
+# You can specify a sysroot using "-s <sysroot>" where sysroot is the absolute
+# system path to the sysroot used for compiling. This script will attempt to
+# generate correct paths for the sysroot.
+#
+# When using a sysroot, you must also specify the architecture via
+# "-a <arch>" where arch is either "x86" or "x64".
+#
+# CrOS systemroots place pkgconfig files at <systemroot>/usr/share/pkgconfig
+# and one of <systemroot>/usr/lib/pkgconfig or <systemroot>/usr/lib64/pkgconfig
+# depending on whether the systemroot is for a 32 or 64 bit architecture. They
+# specify the 'lib' or 'lib64' of the pkgconfig path by defining the
+# 'system_libdir' variable in the args.gn file. pkg_config.gni communicates this
+# variable to this script with the "--system_libdir <system_libdir>" flag. If no
+# flag is provided, then pkgconfig files are assumed to come from
+# <systemroot>/usr/lib/pkgconfig.
+#
+# Additionally, you can specify the option --atleast-version. This will skip
+# the normal outputting of a dictionary and instead print true or false,
+# depending on the return value of pkg-config for the given package.
+
+
+def SetConfigPath(options):
+  """Set the PKG_CONFIG_LIBDIR environment variable.
+
+  This takes into account any sysroot and architecture specification from the
+  options on the given command line.
+  """
+
+  sysroot = options.sysroot
+  assert sysroot
+
+  # Compute the library path name based on the architecture.
+  arch = options.arch
+  if sysroot and not arch:
+    print("You must specify an architecture via -a if using a sysroot.")
+    sys.exit(1)
+
+  libdir = sysroot + '/usr/' + options.system_libdir + '/pkgconfig'
+  libdir += ':' + sysroot + '/usr/share/pkgconfig'
+  os.environ['PKG_CONFIG_LIBDIR'] = libdir
+  return libdir
+
+
+def GetPkgConfigPrefixToStrip(options, args):
+  """Returns the prefix from pkg-config where packages are installed.
+
+  This returned prefix is the one that should be stripped from the beginning of
+  directory names to take into account sysroots.
+  """
+  # Some sysroots, like the Chromium OS ones, may generate paths that are not
+  # relative to the sysroot. For example,
+  # /path/to/chroot/build/x86-generic/usr/lib/pkgconfig/pkg.pc may have all
+  # paths relative to /path/to/chroot (i.e. prefix=/build/x86-generic/usr)
+  # instead of relative to /path/to/chroot/build/x86-generic (i.e prefix=/usr).
+  # To support this correctly, it's necessary to extract the prefix to strip
+  # from pkg-config's |prefix| variable.
+  prefix = subprocess.check_output([options.pkg_config,
+      "--variable=prefix"] + args, env=os.environ).decode('utf-8')
+  if prefix[-4] == '/usr':
+    return prefix[4:]
+  return prefix
+
+
+def MatchesAnyRegexp(flag, list_of_regexps):
+  """Returns true if the first argument matches any regular expression in the
+  given list."""
+  for regexp in list_of_regexps:
+    if regexp.search(flag) != None:
+      return True
+  return False
+
+
+def RewritePath(path, strip_prefix, sysroot):
+  """Rewrites a path by stripping the prefix and prepending the sysroot."""
+  if os.path.isabs(path) and not path.startswith(sysroot):
+    if path.startswith(strip_prefix):
+      path = path[len(strip_prefix):]
+    path = path.lstrip('/')
+    return os.path.join(sysroot, path)
+  else:
+    return path
+
+
+def main():
+  # If this is run on non-Linux platforms, just return nothing and indicate
+  # success. This allows us to "kind of emulate" a Linux build from other
+  # platforms.
+  if "linux" not in sys.platform:
+    print("[[],[],[],[],[]]")
+    return 0
+
+  parser = OptionParser()
+  parser.add_option('-d', '--debug', action='store_true')
+  parser.add_option('-p', action='store', dest='pkg_config', type='string',
+                    default='pkg-config')
+  parser.add_option('-v', action='append', dest='strip_out', type='string')
+  parser.add_option('-s', action='store', dest='sysroot', type='string')
+  parser.add_option('-a', action='store', dest='arch', type='string')
+  parser.add_option('--system_libdir', action='store', dest='system_libdir',
+                    type='string', default='lib')
+  parser.add_option('--atleast-version', action='store',
+                    dest='atleast_version', type='string')
+  parser.add_option('--libdir', action='store_true', dest='libdir')
+  parser.add_option('--dridriverdir', action='store_true', dest='dridriverdir')
+  parser.add_option('--version-as-components', action='store_true',
+                    dest='version_as_components')
+  (options, args) = parser.parse_args()
+
+  # Make a list of regular expressions to strip out.
+  strip_out = []
+  if options.strip_out != None:
+    for regexp in options.strip_out:
+      strip_out.append(re.compile(regexp))
+
+  if options.sysroot:
+    libdir = SetConfigPath(options)
+    if options.debug:
+      sys.stderr.write('PKG_CONFIG_LIBDIR=%s\n' % libdir)
+    prefix = GetPkgConfigPrefixToStrip(options, args)
+  else:
+    prefix = ''
+
+  if options.atleast_version:
+    # When asking for the return value, just run pkg-config and print the return
+    # value, no need to do other work.
+    if not subprocess.call([options.pkg_config,
+                            "--atleast-version=" + options.atleast_version] +
+                            args):
+      print("true")
+    else:
+      print("false")
+    return 0
+
+  if options.version_as_components:
+    cmd = [options.pkg_config, "--modversion"] + args
+    try:
+      version_string = subprocess.check_output(cmd).decode('utf-8')
+    except:
+      sys.stderr.write('Error from pkg-config.\n')
+      return 1
+    print(json.dumps(list(map(int, version_string.strip().split(".")))))
+    return 0
+
+
+  if options.libdir:
+    cmd = [options.pkg_config, "--variable=libdir"] + args
+    if options.debug:
+      sys.stderr.write('Running: %s\n' % cmd)
+    try:
+      libdir = subprocess.check_output(cmd).decode('utf-8')
+    except:
+      print("Error from pkg-config.")
+      return 1
+    sys.stdout.write(libdir.strip())
+    return 0
+
+  if options.dridriverdir:
+    cmd = [options.pkg_config, "--variable=dridriverdir"] + args
+    if options.debug:
+      sys.stderr.write('Running: %s\n' % cmd)
+    try:
+      dridriverdir = subprocess.check_output(cmd).decode('utf-8')
+    except:
+      print("Error from pkg-config.")
+      return 1
+    sys.stdout.write(dridriverdir.strip())
+    return
+
+  cmd = [options.pkg_config, "--cflags", "--libs"] + args
+  if options.debug:
+    sys.stderr.write('Running: %s\n' % ' '.join(cmd))
+
+  try:
+    flag_string = subprocess.check_output(cmd).decode('utf-8')
+  except:
+    sys.stderr.write('Could not run pkg-config.\n')
+    return 1
+
+  # For now just split on spaces to get the args out. This will break if
+  # pkgconfig returns quoted things with spaces in them, but that doesn't seem
+  # to happen in practice.
+  all_flags = flag_string.strip().split(' ')
+
+
+  sysroot = options.sysroot
+  if not sysroot:
+    sysroot = ''
+
+  includes = []
+  cflags = []
+  libs = []
+  lib_dirs = []
+
+  for flag in all_flags[:]:
+    if len(flag) == 0 or MatchesAnyRegexp(flag, strip_out):
+      continue;
+
+    if flag[:2] == '-l':
+      libs.append(RewritePath(flag[2:], prefix, sysroot))
+    elif flag[:2] == '-L':
+      lib_dirs.append(RewritePath(flag[2:], prefix, sysroot))
+    elif flag[:2] == '-I':
+      includes.append(RewritePath(flag[2:], prefix, sysroot))
+    elif flag[:3] == '-Wl':
+      # Don't allow libraries to control ld flags.  These should be specified
+      # only in build files.
+      pass
+    elif flag == '-pthread':
+      # Many libs specify "-pthread" which we don't need since we always include
+      # this anyway. Removing it here prevents a bunch of duplicate inclusions
+      # on the command line.
+      pass
+    else:
+      cflags.append(flag)
+
+  # Output a GN array, the first one is the cflags, the second are the libs. The
+  # JSON formatter prints GN compatible lists when everything is a list of
+  # strings.
+  print(json.dumps([includes, cflags, libs, lib_dirs]))
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())
diff --git a/third_party/libwebrtc/build/config/linux/pkg_config.gni b/third_party/libwebrtc/build/config/linux/pkg_config.gni
new file mode 100644
index 0000000000..f3b40755bd
--- /dev/null
+++ b/third_party/libwebrtc/build/config/linux/pkg_config.gni
@@ -0,0 +1,128 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/sysroot.gni")
+
+# Defines a config specifying the result of running pkg-config for the given
+# packages. Put the package names you want to query in the "packages" variable
+# inside the template invocation.
+#
+# You can also add defines via the "defines" variable. This can be useful to
+# add this to the config to pass defines that the library expects to get by
+# users of its headers.
+#
+# Example:
+#   pkg_config("mything") {
+#     packages = [ "mything1", "mything2" ]
+#     defines = [ "ENABLE_AWESOME" ]
+#   }
+#
+# You can also use "extra args" to filter out results (see pkg-config.py):
+#   extra_args = [ "-v, "foo" ]
+# To ignore libs and ldflags (only cflags/defines will be set, which is useful
+# when doing manual dynamic linking), set:
+#   ignore_libs = true
+
+declare_args() {
+  # A pkg-config wrapper to call instead of trying to find and call the right
+  # pkg-config directly. Wrappers like this are common in cross-compilation
+  # environments.
+  # Leaving it blank defaults to searching PATH for 'pkg-config' and relying on
+  # the sysroot mechanism to find the right .pc files.
+  pkg_config = ""
+
+  # A optional pkg-config wrapper to use for tools built on the host.
+  host_pkg_config = ""
+
+  # CrOS systemroots place pkgconfig files at <systemroot>/usr/share/pkgconfig
+  # and one of <systemroot>/usr/lib/pkgconfig or <systemroot>/usr/lib64/pkgconfig
+  # depending on whether the systemroot is for a 32 or 64 bit architecture.
+  #
+  # When build under GYP, CrOS board builds specify the 'system_libdir' variable
+  # as part of the GYP_DEFINES provided by the CrOS emerge build or simple
+  # chrome build scheme. This variable permits controlling this for GN builds
+  # in similar fashion by setting the `system_libdir` variable in the build's
+  # args.gn file to 'lib' or 'lib64' as appropriate for the target architecture.
+  system_libdir = "lib"
+}
+
+pkg_config_script = "//build/config/linux/pkg-config.py"
+
+# Define the args we pass to the pkg-config script for other build files that
+# need to invoke it manually.
+pkg_config_args = []
+
+if (sysroot != "") {
+  # Pass the sysroot if we're using one (it requires the CPU arch also).
+  pkg_config_args += [
+    "-s",
+    rebase_path(sysroot),
+    "-a",
+    target_cpu,
+  ]
+}
+
+if (pkg_config != "") {
+  pkg_config_args += [
+    "-p",
+    pkg_config,
+  ]
+}
+
+# Only use the custom libdir when building with the target sysroot.
+if (target_sysroot != "" && sysroot == target_sysroot) {
+  pkg_config_args += [
+    "--system_libdir",
+    system_libdir,
+  ]
+}
+
+if (host_pkg_config != "") {
+  host_pkg_config_args = [
+    "-p",
+    host_pkg_config,
+  ]
+} else {
+  host_pkg_config_args = pkg_config_args
+}
+
+template("pkg_config") {
+  assert(defined(invoker.packages),
+         "Variable |packages| must be defined to be a list in pkg_config.")
+  config(target_name) {
+    if (host_toolchain == current_toolchain) {
+      args = host_pkg_config_args + invoker.packages
+    } else {
+      args = pkg_config_args + invoker.packages
+    }
+    if (defined(invoker.extra_args)) {
+      args += invoker.extra_args
+    }
+
+    pkgresult = exec_script(pkg_config_script, args, "value")
+    cflags = pkgresult[1]
+
+    foreach(include, pkgresult[0]) {
+      if (use_sysroot) {
+        # We want the system include paths to use -isystem instead of -I to
+        # suppress warnings in those headers.
+        include_relativized = rebase_path(include, root_build_dir)
+        cflags += [ "-isystem$include_relativized" ]
+      } else {
+        cflags += [ "-I$include" ]
+      }
+    }
+
+    if (!defined(invoker.ignore_libs) || !invoker.ignore_libs) {
+      libs = pkgresult[2]
+      lib_dirs = pkgresult[3]
+    }
+
+    forward_variables_from(invoker,
+                           [
+                             "defines",
+                             "visibility",
+                           ])
+  }
+}
diff --git a/third_party/libwebrtc/build/config/locales.gni b/third_party/libwebrtc/build/config/locales.gni
new file mode 100644
index 0000000000..1d57b877dc
--- /dev/null
+++ b/third_party/libwebrtc/build/config/locales.gni
@@ -0,0 +1,251 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chromeos/ui_mode.gni")
+
+# This file creates the |locales| which is the set of current
+# locales based on the current platform. Locales in this list are formated
+# based on what .pak files expect.
+# The |locales| variable *may* contain pseudolocales, depending on the
+# |enable_pseudolocales| flag.
+# If you specifically want to have the locales variable with or without
+# pseudolocales, then use |locales_with_pseudolocales| or
+# |locales_without_pseudolocales|.
+
+# The following additional platform specific lists are created:
+# - |android_bundle_locales_as_resources| locales formatted for XML output names
+# - |locales_as_mac_outputs| formated for mac output bundles
+# - |ios_packed_locales| subset for iOS
+# - |ios_packed_locales_as_mac_outputs| subset for iOS output
+
+# Chrome on iOS only ships with a subset of the locales supported by other
+# version of Chrome as the corresponding locales are not supported by the
+# operating system (but for simplicity, the corresponding .pak files are
+# still generated).
+ios_unsupported_locales = [
+  "am",
+  "bn",
+  "et",
+  "fil",
+  "gu",
+  "kn",
+  "lv",
+  "ml",
+  "mr",
+  "sl",
+  "sw",
+  "ta",
+  "te",
+]
+
+# These list are defined even when not building for Android or iOS for the
+# sake of build/locale_tool.py. Ensure that GN doesn't complain about them
+# being unused.
+not_needed([ "ios_unsupported_locales" ])
+
+# Superset of all locales used in Chrome with platform specific changes noted.
+all_chrome_locales = [
+  "af",
+  "am",
+  "ar",
+  "as",
+  "az",
+  "be",
+  "bg",
+  "bn",
+  "bs",
+  "ca",
+  "cs",
+  "da",
+  "de",
+  "el",
+  "en-GB",
+  "en-US",
+  "es",
+  "es-419",  # "es-MX" in iOS (Mexico vs Latin America) "es-US" on Android
+  "et",
+  "eu",
+  "fa",
+  "fi",
+  "fil",  # "tl" in .xml but "fil" in TC and .pak
+  "fr",
+  "fr-CA",
+  "gl",
+  "gu",
+  "he",  # "iw" in .xml and TC but "he" in .pak
+  "hi",
+  "hr",
+  "hu",
+  "hy",
+  "id",  # "in" in .xml but "id" in TC and .pak
+  "is",
+  "it",
+  "ja",
+  "ka",
+  "kk",
+  "km",
+  "kn",
+  "ko",
+  "ky",
+  "lo",
+  "lt",
+  "lv",
+  "mk",
+  "ml",
+  "mn",
+  "mr",
+  "ms",
+  "my",
+  "nb",  # "no" in TC but "nb" in .xml and .pak
+  "ne",
+  "nl",
+  "or",
+  "pa",
+  "pl",
+  "pt-BR",  # just "pt" in iOS
+  "pt-PT",
+  "ro",
+  "ru",
+  "si",
+  "sk",
+  "sl",
+  "sq",
+  "sr",
+  "sr-Latn",  # -b+sr+Latn in .xml
+  "sv",
+  "sw",
+  "ta",
+  "te",
+  "th",
+  "tr",
+  "uk",
+  "ur",
+  "uz",
+  "vi",
+  "zh-CN",
+  "zh-HK",
+  "zh-TW",
+  "zu",
+]
+
+# New locales added to Chrome Android bundle builds.
+android_bundle_only_locales = [
+  "af",
+  "as",
+  "az",
+  "be",
+  "bs",
+  "eu",
+  "fr-CA",
+  "gl",
+  "hy",
+  "is",
+  "ka",
+  "kk",
+  "km",
+  "ky",
+  "lo",
+  "mk",
+  "mn",
+  "my",
+  "ne",
+  "or",
+  "pa",
+  "si",
+  "sq",
+  "sr-Latn",
+  "ur",
+  "uz",
+  "zh-HK",
+  "zu",
+]
+
+# New locales added to ChromeOS builds.
+chromeos_only_locales = [ "is" ]
+
+if (is_android) {
+  locales = all_chrome_locales
+
+  # List for Android locale names in .xml exports. Note: needs to stay in sync
+  # with |ToAndroidLocaleName| in build/android/gyp/util/resource_utils.py.
+  #  - add r: (e.g. zh-HK -> zh-rHK )
+  android_bundle_locales_as_resources = []
+  foreach(_locale, locales) {
+    android_bundle_locales_as_resources +=
+        [ string_replace(_locale, "-", "-r") ]
+  }
+
+  #  - remove en-US
+  #  - swap: (he, id, en-419, fil) -> (iw, in, es-rUS, tl)
+  #  - sr-rLatn -> -b+sr+Latn
+  android_bundle_locales_as_resources -= [
+    "en-rUS",
+    "es-r419",
+    "fil",
+    "he",
+    "id",
+    "sr-rLatn",
+  ]
+  android_bundle_locales_as_resources += [
+    "b+sr+Latn",
+    "es-rUS",
+    "in",
+    "iw",
+    "tl",
+  ]
+} else if (is_chromeos_ash || is_chromeos_lacros) {
+  # In ChromeOS we support a few more locales than standard Chrome.
+  locales =
+      all_chrome_locales - android_bundle_only_locales + chromeos_only_locales
+} else {
+  # Change if other platforms support more locales.
+  locales = all_chrome_locales - android_bundle_only_locales
+}
+
+# Chrome on iOS uses different names for "es-419" and "pt-BR" (called
+# respectively "es-MX" and "pt" on iOS).
+if (is_ios) {
+  locales -= [
+    "es-419",
+    "pt-BR",
+  ]
+  locales += [
+    "es-MX",
+    "pt",
+  ]
+}
+
+pseudolocales = [
+  "ar-XB",
+  "en-XA",
+]
+locales_without_pseudolocales = locales
+locales_with_pseudolocales = locales + pseudolocales
+
+declare_args() {
+  # We want to give pseudolocales to everyone except end-users (devs & QA).
+  enable_pseudolocales = !is_official_build
+}
+
+if (enable_pseudolocales) {
+  # Note that this only packages the locales in, and doesn't add the ui to enable them.
+  locales += pseudolocales
+}
+
+# Same as the locales list but in the format Mac expects for output files:
+# it uses underscores instead of hyphens, and "en" instead of "en-US".
+locales_as_mac_outputs = []
+foreach(locale, locales) {
+  if (locale == "en-US") {
+    locales_as_mac_outputs += [ "en" ]
+  } else {
+    locales_as_mac_outputs += [ string_replace(locale, "-", "_") ]
+  }
+}
+
+if (is_ios) {
+  ios_packed_locales = locales - ios_unsupported_locales
+  ios_packed_locales_as_mac_outputs =
+      locales_as_mac_outputs - ios_unsupported_locales
+}
diff --git a/third_party/libwebrtc/build/config/logging.gni b/third_party/libwebrtc/build/config/logging.gni
new file mode 100644
index 0000000000..c2f94e929e
--- /dev/null
+++ b/third_party/libwebrtc/build/config/logging.gni
@@ -0,0 +1,13 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/config/dcheck_always_on.gni")
+
+declare_args() {
+  # Use LogErrorNotReached() for NOTREACHED().
+  enable_log_error_not_reached =
+      is_chromeos_ash && !(is_debug || dcheck_always_on)
+  enable_stack_trace_line_numbers = false
+}
diff --git a/third_party/libwebrtc/build/config/mac/BUILD.gn b/third_party/libwebrtc/build/config/mac/BUILD.gn
new file mode 100644
index 0000000000..032c77ee34
--- /dev/null
+++ b/third_party/libwebrtc/build/config/mac/BUILD.gn
@@ -0,0 +1,136 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/apple/symbols.gni")
+import("//build/config/c++/c++.gni")
+import("//build/config/mac/mac_sdk.gni")
+import("//build/config/sysroot.gni")
+
+# This is included by reference in the //build/config/compiler config that
+# is applied to all targets. It is here to separate out the logic.
+config("compiler") {
+  # These flags are shared between the C compiler and linker.
+  common_mac_flags = []
+
+  # CPU architecture.
+  if (target_cpu == "x64") {
+    clang_arch = "x86_64"
+  } else if (target_cpu == "x86") {
+    clang_arch = "i386"
+  } else if (target_cpu == "arm64") {
+    clang_arch = target_cpu
+  } else {
+    assert(false, "unknown target_cpu $target_cpu")
+  }
+  if (host_os == "mac") {
+    common_mac_flags += [
+      "-arch",
+      clang_arch,
+    ]
+  } else {
+    common_mac_flags += [ "--target=$clang_arch-apple-macos" ]
+  }
+
+  # This is here so that all files get recompiled after an Xcode update.
+  # (defines are passed via the command line, and build system rebuild things
+  # when their commandline changes). Nothing should ever read this define.
+  defines = [ "CR_XCODE_VERSION=$xcode_version" ]
+
+  asmflags = common_mac_flags
+  cflags = common_mac_flags
+
+  # Without this, the constructors and destructors of a C++ object inside
+  # an Objective C struct won't be called, which is very bad.
+  cflags_objcc = [ "-fobjc-call-cxx-cdtors" ]
+
+  ldflags = common_mac_flags
+
+  if (save_unstripped_output) {
+    ldflags += [ "-Wcrl,unstripped," + rebase_path(root_out_dir) ]
+  }
+
+  if (export_libcxxabi_from_executables) {
+    ldflags += [ "-Wl,-undefined,dynamic_lookup" ]
+  }
+}
+
+# This is included by reference in the //build/config/compiler:runtime_library
+# config that is applied to all targets. It is here to separate out the logic
+# that is Mac-only. Please see that target for advice on what should go in
+# :runtime_library vs. :compiler.
+config("runtime_library") {
+  common_flags = [
+    "-isysroot",
+    rebase_path(sysroot, root_build_dir),
+    "-mmacosx-version-min=$mac_deployment_target",
+  ]
+
+  asmflags = common_flags
+  cflags = common_flags
+  ldflags = common_flags
+
+  # Prevent Mac OS X AssertMacros.h (included by system header) from defining
+  # macros that collide with common names, like 'check', 'require', and
+  # 'verify'.
+  # http://opensource.apple.com/source/CarbonHeaders/CarbonHeaders-18.1/AssertMacros.h
+  defines = [ "__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES=0" ]
+}
+
+# On Mac, this is used for everything except static libraries.
+config("mac_dynamic_flags") {
+  ldflags = [ "-Wl,-ObjC" ]  # Always load Objective-C categories and classes.
+
+  if (is_component_build) {
+    ldflags += [
+      # Path for loading shared libraries for unbundled binaries.
+      "-Wl,-rpath,@loader_path/.",
+
+      # Path for loading shared libraries for bundled binaries. Get back from
+      # Binary.app/Contents/MacOS.
+      "-Wl,-rpath,@loader_path/../../..",
+    ]
+  }
+}
+
+# The ldflags referenced below are handled by
+# //build/toolchain/apple/linker_driver.py.
+# Remove this config if a target wishes to change the arguments passed to the
+# strip command during linking. This config by default strips all symbols
+# from a binary, but some targets may wish to specify an exports file to
+# preserve specific symbols.
+config("strip_all") {
+  if (enable_stripping) {
+    ldflags = [ "-Wcrl,strip,-x,-S" ]
+  }
+}
+
+# When building with Goma, all inputs must be relative to the build directory.
+# If using the system Xcode, which typically resides outside the build root, a
+# symlink to the SDK is created in the build directory, and the path to that
+# link is stored in $mac_sdk_path. If an action references a file in the SDK as
+# an input, GN will complain that no target generates the file because it is
+# below the $root_build_dir. The below action lists as outputs the files in the
+# SDK that are referenced as inputs to actions, so that GN thinks a target has
+# generated them. The list is centralized here, as multiple targets need to
+# reference the same files, and an output can only be generated once.
+#
+# The symbolic link for $mac_sdk_path is set up by
+# //build/config/apple/sdk_info.py in //build/config/mac/mac_sdk.gni.
+if (use_system_xcode && use_goma && target_os == "mac" &&
+    current_toolchain == default_toolchain) {
+  action("sdk_inputs") {
+    script = "//build/noop.py"
+    outputs = [
+      "$mac_sdk_path/usr/include/mach/exc.defs",
+      "$mac_sdk_path/usr/include/mach/mach_exc.defs",
+      "$mac_sdk_path/usr/include/mach/notify.defs",
+    ]
+  }
+} else {
+  group("sdk_inputs") {
+    if (current_toolchain != default_toolchain) {
+      public_deps = [ ":sdk_inputs($default_toolchain)" ]
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/mac/BuildInfo.plist b/third_party/libwebrtc/build/config/mac/BuildInfo.plist
new file mode 100644
index 0000000000..bfa3b8d573
--- /dev/null
+++ b/third_party/libwebrtc/build/config/mac/BuildInfo.plist
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>DTCompiler</key>
+  <string>${GCC_VERSION}</string>
+  <key>DTSDKBuild</key>
+  <string>${MAC_SDK_BUILD}</string>
+  <key>DTSDKName</key>
+  <string>${MAC_SDK_NAME}</string>
+  <key>DTXcode</key>
+  <string>${XCODE_VERSION}</string>
+  <key>DTXcodeBuild</key>
+  <string>${XCODE_BUILD}</string>
+</dict>
+</plist>
diff --git a/third_party/libwebrtc/build/config/mac/OWNERS b/third_party/libwebrtc/build/config/mac/OWNERS
new file mode 100644
index 0000000000..6f3324f07c
--- /dev/null
+++ b/third_party/libwebrtc/build/config/mac/OWNERS
@@ -0,0 +1 @@
+file://build/apple/OWNERS
diff --git a/third_party/libwebrtc/build/config/mac/mac_sdk.gni b/third_party/libwebrtc/build/config/mac/mac_sdk.gni
new file mode 100644
index 0000000000..6671893ae8
--- /dev/null
+++ b/third_party/libwebrtc/build/config/mac/mac_sdk.gni
@@ -0,0 +1,127 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chrome_build.gni")
+import("//build/config/gclient_args.gni")
+import("//build/config/mac/mac_sdk_overrides.gni")
+import("//build/toolchain/goma.gni")
+import("//build/toolchain/toolchain.gni")
+
+assert(current_os == "mac" || current_toolchain == default_toolchain)
+
+declare_args() {
+  # The MACOSX_DEPLOYMENT_TARGET variable used when compiling. This partially
+  # controls the minimum supported version of macOS for Chromium by
+  # affecting the symbol availability rules. This may differ from
+  # mac_min_system_version when dropping support for older macOSes but where
+  # additional code changes are required to be compliant with the availability
+  # rules.
+  # Must be of the form x.x.x for Info.plist files.
+  mac_deployment_target = "10.11.0"
+
+  # The value of the LSMinimmumSystemVersion in Info.plist files. This partially
+  # controls the minimum supported version of macOS for Chromium by
+  # affecting the Info.plist. This may differ from mac_deployment_target when
+  # dropping support for older macOSes. This should be greater than or equal to
+  # the mac_deployment_target version.
+  # Must be of the form x.x.x for Info.plist files.
+  mac_min_system_version = "10.11.0"
+
+  # Path to a specific version of the Mac SDK, not including a slash at the end.
+  # If empty, the path to the lowest version greater than or equal to
+  # mac_sdk_min is used.
+  mac_sdk_path = ""
+
+  # The SDK name as accepted by xcodebuild.
+  mac_sdk_name = "macosx"
+
+  # The SDK version used when making official builds. This is a single exact
+  # version, not a minimum. If this version isn't available official builds
+  # will fail.
+  mac_sdk_official_version = "11.3"
+
+  # Production builds should use hermetic Xcode. If you want to do production
+  # builds with system Xcode to test new SDKs, set this.
+  # Don't set this on any bots.
+  mac_allow_system_xcode_for_official_builds_for_testing = false
+}
+
+# Check that the version of macOS SDK used is the one requested when building
+# a version of Chrome shipped to the users. Disable the check if building for
+# iOS as the version macOS SDK used is not relevant for the tool build for the
+# host (they are not shipped) --- this is required as Chrome on iOS is usually
+# build with the latest version of Xcode that may not ship with the version of
+# the macOS SDK used to build Chrome on mac.
+# TODO(crbug.com/635745): the check for target_os should be replaced by a
+# check that current_toolchain is default_toolchain, and the file should
+# assert that current_os is "mac" once this file is no longer included by
+# iOS toolchains.
+if (is_chrome_branded && is_official_build && target_os != "ios") {
+  assert(!use_system_xcode ||
+             mac_allow_system_xcode_for_official_builds_for_testing,
+         "official branded builds should use hermetic xcode")
+}
+
+# The path to the hermetic install of Xcode. Only relevant when
+# use_system_xcode = false.
+if (!use_system_xcode) {
+  _hermetic_xcode_path = "//build/mac_files/xcode_binaries"
+}
+
+script_name = "//build/config/apple/sdk_info.py"
+sdk_info_args = []
+if (!use_system_xcode) {
+  sdk_info_args += [
+    "--developer_dir",
+    rebase_path(_hermetic_xcode_path, "", root_build_dir),
+  ]
+}
+
+# Goma RBE requires paths relative to source directory. When using system
+# Xcode, this is done by creating symbolic links in root_build_dir.
+if (use_system_xcode && use_goma) {
+  sdk_info_args += [
+    "--get_sdk_info",
+    "--create_symlink_at",
+    "sdk/xcode_links",
+  ]
+}
+sdk_info_args += [ mac_sdk_name ]
+
+#_mac_sdk_result = exec_script(script_name, sdk_info_args, "scope")
+#xcode_version = _mac_sdk_result.xcode_version
+#xcode_build = _mac_sdk_result.xcode_build
+if (mac_sdk_path == "" && use_system_xcode && use_goma) {
+  mac_sdk_path = _mac_sdk_result.sdk_path
+}
+
+if (use_system_xcode) {
+  # The tool will print the SDK path on the first line, and the version on the
+  # second line.
+  find_sdk_args = [
+    "--print_sdk_path",
+    "--print_bin_path",
+    mac_sdk_min,
+  ]
+  find_sdk_lines =
+      exec_script("//build/mac/find_sdk.py", find_sdk_args, "list lines")
+  mac_sdk_version = find_sdk_lines[2]
+  if (mac_sdk_path == "") {
+    mac_sdk_path = find_sdk_lines[0]
+    mac_bin_path = find_sdk_lines[1]
+  } else {
+    mac_bin_path = find_sdk_lines[1]
+  }
+} else {
+  mac_sdk_version = mac_sdk_official_version
+  _dev = _hermetic_xcode_path + "/Contents/Developer"
+  _sdk = "MacOSX${mac_sdk_version}.sdk"
+  mac_sdk_path = _dev + "/Platforms/MacOSX.platform/Developer/SDKs/$_sdk"
+  mac_bin_path = _dev + "/Toolchains/XcodeDefault.xctoolchain/usr/bin/"
+
+  # If we're using hermetic Xcode, then we want the paths to be relative so that
+  # generated ninja files are independent of the directory location.
+  # TODO(thakis): Do this at the uses of this variable instead.
+  mac_bin_path = rebase_path(mac_bin_path, root_build_dir)
+}
diff --git a/third_party/libwebrtc/build/config/mac/mac_sdk_overrides.gni b/third_party/libwebrtc/build/config/mac/mac_sdk_overrides.gni
new file mode 100644
index 0000000000..17eb3d9f62
--- /dev/null
+++ b/third_party/libwebrtc/build/config/mac/mac_sdk_overrides.gni
@@ -0,0 +1,16 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This file contains arguments that subprojects may choose to override. It
+# asserts that those overrides are used, to prevent unused args warnings.
+
+_sdk_min_from_env = getenv("FORCE_MAC_SDK_MIN")
+declare_args() {
+  # Minimum supported version of the Mac SDK.
+  if (_sdk_min_from_env == "") {
+    mac_sdk_min = "10.15"
+  } else {
+    mac_sdk_min = _sdk_min_from_env
+  }
+}
diff --git a/third_party/libwebrtc/build/config/mac/package_framework.py b/third_party/libwebrtc/build/config/mac/package_framework.py
new file mode 100644
index 0000000000..0026f466b4
--- /dev/null
+++ b/third_party/libwebrtc/build/config/mac/package_framework.py
@@ -0,0 +1,60 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import argparse
+import errno
+import os
+import shutil
+import sys
+
+def Main():
+  parser = argparse.ArgumentParser(description='Create Mac Framework symlinks')
+  parser.add_argument('--framework', action='store', type=str, required=True)
+  parser.add_argument('--version', action='store', type=str)
+  parser.add_argument('--contents', action='store', type=str, nargs='+')
+  parser.add_argument('--stamp', action='store', type=str, required=True)
+  args = parser.parse_args()
+
+  VERSIONS = 'Versions'
+  CURRENT = 'Current'
+
+  # Ensure the Foo.framework/Versions/A/ directory exists and create the
+  # Foo.framework/Versions/Current symlink to it.
+  if args.version:
+    try:
+      os.makedirs(os.path.join(args.framework, VERSIONS, args.version), 0o755)
+    except OSError as e:
+      if e.errno != errno.EEXIST:
+        raise e
+    _Relink(os.path.join(args.version),
+            os.path.join(args.framework, VERSIONS, CURRENT))
+
+  # Establish the top-level symlinks in the framework bundle. The dest of
+  # the symlinks may not exist yet.
+  if args.contents:
+    for item in args.contents:
+      _Relink(os.path.join(VERSIONS, CURRENT, item),
+              os.path.join(args.framework, item))
+
+  # Write out a stamp file.
+  if args.stamp:
+    with open(args.stamp, 'w') as f:
+      f.write(str(args))
+
+  return 0
+
+
+def _Relink(dest, link):
+  """Creates a symlink to |dest| named |link|. If |link| already exists,
+  it is overwritten."""
+  try:
+    os.remove(link)
+  except OSError as e:
+    if e.errno != errno.ENOENT:
+      shutil.rmtree(link)
+  os.symlink(dest, link)
+
+
+if __name__ == '__main__':
+  sys.exit(Main())
diff --git a/third_party/libwebrtc/build/config/mac/prepare_framework_version.py b/third_party/libwebrtc/build/config/mac/prepare_framework_version.py
new file mode 100644
index 0000000000..db92150698
--- /dev/null
+++ b/third_party/libwebrtc/build/config/mac/prepare_framework_version.py
@@ -0,0 +1,42 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import shutil
+import sys
+
+# Ensures that the current version matches the last-produced version, which is
+# stored in the version_file. If it does not, then the framework_root_dir is
+# obliterated.
+# Usage: python prepare_framework_version.py out/obj/version_file \
+#                                            out/Framework.framework \
+#                                            'A'
+
+def PrepareFrameworkVersion(version_file, framework_root_dir, version):
+  # Test what the current framework version is. Stop if it is up-to-date.
+  try:
+    with open(version_file, 'r') as f:
+      current_version = f.read()
+      if current_version == version:
+        return
+  except IOError:
+    pass
+
+  # The framework version has changed, so clobber the framework.
+  if os.path.exists(framework_root_dir):
+    shutil.rmtree(framework_root_dir)
+
+  # Write out the new framework version file, making sure its containing
+  # directory exists.
+  dirname = os.path.dirname(version_file)
+  if not os.path.isdir(dirname):
+    os.makedirs(dirname, 0o700)
+
+  with open(version_file, 'w+') as f:
+    f.write(version)
+
+
+if __name__ == '__main__':
+  PrepareFrameworkVersion(sys.argv[1], sys.argv[2], sys.argv[3])
+  sys.exit(0)
diff --git a/third_party/libwebrtc/build/config/mac/rules.gni b/third_party/libwebrtc/build/config/mac/rules.gni
new file mode 100644
index 0000000000..7753a97fe7
--- /dev/null
+++ b/third_party/libwebrtc/build/config/mac/rules.gni
@@ -0,0 +1,628 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/apple/apple_info_plist.gni")
+import("//build/config/apple/symbols.gni")
+import("//build/config/mac/mac_sdk.gni")
+
+# Generates Info.plist files for Mac apps and frameworks.
+#
+# Arguments
+#
+#     info_plist:
+#         (optional) string, path to the Info.plist file that will be used for
+#         the bundle.
+#
+#     info_plist_target:
+#         (optional) string, if the info_plist is generated from an action,
+#         rather than a regular source file, specify the target name in lieu
+#         of info_plist. The two arguments are mutually exclusive.
+#
+#     executable_name:
+#         string, name of the generated target used for the product
+#         and executable name as specified in the output Info.plist.
+#
+#     extra_substitutions:
+#         (optional) string array, 'key=value' pairs for extra fields which are
+#         specified in a source Info.plist template.
+template("mac_info_plist") {
+  assert(defined(invoker.info_plist) != defined(invoker.info_plist_target),
+         "Only one of info_plist or info_plist_target may be specified in " +
+             target_name)
+
+  if (defined(invoker.info_plist)) {
+    _info_plist = invoker.info_plist
+  } else {
+    _info_plist_target_output = get_target_outputs(invoker.info_plist_target)
+    _info_plist = _info_plist_target_output[0]
+  }
+
+  apple_info_plist(target_name) {
+    format = "xml1"
+    extra_substitutions = []
+    if (defined(invoker.extra_substitutions)) {
+      extra_substitutions = invoker.extra_substitutions
+    }
+    extra_substitutions += [
+      "MAC_SDK_BUILD=$mac_sdk_version",
+      "MAC_SDK_NAME=$mac_sdk_name$mac_sdk_version",
+      "MACOSX_DEPLOYMENT_TARGET=$mac_deployment_target",
+      "CHROMIUM_MIN_SYSTEM_VERSION=$mac_min_system_version",
+      "XCODE_BUILD=$xcode_build",
+      "XCODE_VERSION=$xcode_version",
+    ]
+    plist_templates = [
+      "//build/config/mac/BuildInfo.plist",
+      _info_plist,
+    ]
+    if (defined(invoker.info_plist_target)) {
+      deps = [ invoker.info_plist_target ]
+    }
+    forward_variables_from(invoker,
+                           [
+                             "testonly",
+                             "executable_name",
+                           ])
+  }
+}
+
+# Template to package a shared library into a Mac framework bundle.
+#
+# By default, the bundle target this template generates does not link the
+# resulting framework into anything that depends on it. If a dependency wants
+# a link-time (as well as build-time) dependency on the framework bundle,
+# depend against "$target_name+link". If only the build-time dependency is
+# required (e.g., for copying into another bundle), then use "$target_name".
+#
+# Arguments
+#
+#     framework_version:
+#         string, version of the framework. Typically this is a
+#         single letter, like "A".
+#
+#     framework_contents:
+#         list of string, top-level items in the framework. This is
+#         the list of symlinks to create in the .framework directory that link
+#         into Versions/Current/.
+#
+#     info_plist:
+#         (optional) string, path to the Info.plist file that will be used for
+#         the bundle.
+#
+#     info_plist_target:
+#         (optional) string, if the info_plist is generated from an action,
+#         rather than a regular source file, specify the target name in lieu
+#         of info_plist. The two arguments are mutually exclusive.
+#
+#     output_name:
+#         (optional) string, name of the generated framework without the
+#         .framework suffix. If omitted, defaults to target_name.
+#
+#     extra_substitutions:
+#         (optional) string array, 'key=value' pairs for extra fields which are
+#         specified in a source Info.plist template.
+#
+# This template provides three targets for the resulting framework bundle. The
+# link-time behavior varies depending on which of the two targets below is
+# added as a dependency:
+#   - $target_name only adds a build-time dependency. Targets that depend on
+#     it will not link against the framework.
+#   - $target_name+link adds a build-time and link-time dependency. Targets
+#     that depend on it will link against the framework.
+#   - $target_name+link_nested adds a build-time and link-time dependency, but
+#     only on the shared library and not the fully-assembled framework bundle.
+#     This should only be used for other nested binary components of the
+#     framework bundle (e.g. Helpers) that themselves depend on the main shared
+#     library of the framework bundle.
+#
+# The build-time-only dependency is used for when a target needs to use the
+# framework either only for resources, or because the target loads it at run-
+# time, via dlopen() or NSBundle. The link-time dependency will cause the
+# dependee to have the framework loaded by dyld at launch.
+#
+# Example of build-time only dependency:
+#
+#     mac_framework_bundle("CoreTeleportation") {
+#       sources = [ ... ]
+#     }
+#
+#     bundle_data("core_teleportation_bundle_data") {
+#       deps = [ ":CoreTeleportation" ]
+#       sources = [ "$root_out_dir/CoreTeleportation.framework" ]
+#       outputs = [ "{{bundle_contents_dir}}/Frameworks/{{source_file_part}}" ]
+#     }
+#
+#     app_bundle("GoatTeleporter") {
+#       sources = [ ... ]
+#       deps = [
+#         ":core_teleportation_bundle_data",
+#       ]
+#     }
+#
+# The GoatTeleporter.app will not directly link against
+# CoreTeleportation.framework, but it will be included in the bundle's
+# Frameworks directory.
+#
+# Example of link-time dependency:
+#
+#     mac_framework_bundle("CoreTeleportation") {
+#       sources = [ ... ]
+#       ldflags = [
+#         "-install_name",
+#         "@executable_path/../Frameworks/$target_name.framework"
+#       ]
+#     }
+#
+#     bundle_data("core_teleportation_bundle_data") {
+#       deps = [ ":CoreTeleportation+link" ]
+#       sources = [ "$root_out_dir/CoreTeleportation.framework" ]
+#       outputs = [ "{{bundle_contents_dir}}/Frameworks/{{source_file_part}}" ]
+#     }
+#
+#     app_bundle("GoatTeleporter") {
+#       sources = [ ... ]
+#       deps = [
+#         ":core_teleportation_bundle_data",
+#       ]
+#     }
+#
+# Note that the framework is still copied to the app's bundle, but dyld will
+# load this library when the app is launched because it uses the "+link"
+# target as a dependency. This also requires that the framework set its
+# install_name so that dyld can locate it.
+#
+# See "gn help shared_library" for more information on arguments supported
+# by shared library target.
+template("mac_framework_bundle") {
+  assert(defined(invoker.deps) || defined(invoker.public_deps),
+         "Dependencies must be specified for $target_name")
+  assert(invoker.framework_version != "", "framework_version is required")
+  assert(defined(invoker.framework_contents), "framework_contents is required")
+
+  _info_plist_target = target_name + "_info_plist"
+
+  mac_info_plist(_info_plist_target) {
+    executable_name = target_name
+    if (defined(invoker.output_name)) {
+      executable_name = invoker.output_name
+    }
+    forward_variables_from(invoker,
+                           [
+                             "extra_substitutions",
+                             "info_plist",
+                             "info_plist_target",
+                             "testonly",
+                           ])
+  }
+
+  _info_plist_bundle_data = _info_plist_target + "_bundle_data"
+
+  bundle_data(_info_plist_bundle_data) {
+    forward_variables_from(invoker, [ "testonly" ])
+    sources = get_target_outputs(":$_info_plist_target")
+    outputs = [ "{{bundle_resources_dir}}/Info.plist" ]
+    public_deps = [ ":$_info_plist_target" ]
+  }
+
+  _target_name = target_name
+  _output_name = target_name
+  if (defined(invoker.output_name)) {
+    _output_name = invoker.output_name
+  }
+
+  # Create a file to track the build dependency on the framework_version and
+  # framework_contents variables.
+  _framework_toc = [
+                     "Version=" + invoker.framework_version,
+                     _output_name,
+                   ] + invoker.framework_contents
+  _framework_contents = [ _output_name ] + invoker.framework_contents
+  _framework_toc_file = "$target_out_dir/${target_name}.toc"
+  write_file(_framework_toc_file, _framework_toc)
+
+  # Create local variables for referencing different parts of the bundle.
+  _framework_target = _target_name
+  _framework_name = _output_name + ".framework"
+  _framework_base_dir = "$root_out_dir/$_framework_name"
+  _framework_root_dir =
+      _framework_base_dir + "/Versions/${invoker.framework_version}"
+
+  # Clean the entire framework if the framework_version changes.
+  _version_file = "$target_out_dir/${target_name}_version"
+  exec_script("//build/config/mac/prepare_framework_version.py",
+              [
+                rebase_path(_version_file),
+                rebase_path(_framework_base_dir),
+                invoker.framework_version,
+              ])
+
+  # Create the symlinks.
+  _framework_package_target = target_name + "_package"
+  action(_framework_package_target) {
+    script = "//build/config/mac/package_framework.py"
+
+    # The TOC file never needs to be read, since its contents are the values
+    # of GN variables. It is only used to trigger this rule when the values
+    # change.
+    inputs = [ _framework_toc_file ]
+
+    _stamp_file = "$target_out_dir/run_${_framework_package_target}.stamp"
+    outputs = [ _stamp_file ]
+
+    visibility = [ ":$_framework_target" ]
+
+    args = [
+             "--framework",
+             rebase_path(_framework_base_dir, root_build_dir),
+             "--stamp",
+             rebase_path(_stamp_file, root_build_dir),
+             "--version",
+             invoker.framework_version,
+             "--contents",
+           ] + _framework_contents
+
+    # It is not possible to list _framework_contents as outputs, since
+    # ninja does not properly stat symbolic links.
+    # https://github.com/ninja-build/ninja/issues/1186
+  }
+
+  _link_shared_library_target = target_name + "_shared_library"
+  _shared_library_bundle_data = target_name + "_shared_library_bundle_data"
+
+  shared_library(_link_shared_library_target) {
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "assert_no_deps",
+                             "bundle_deps",
+                             "code_signing_enabled",
+                             "data_deps",
+                             "info_plist",
+                             "info_plist_target",
+                             "output_name",
+                             "visibility",
+                           ])
+    visibility = [
+      ":$_shared_library_bundle_data",
+      ":${_framework_target}+link_nested",
+    ]
+    output_name = _output_name
+    output_prefix_override = true
+    output_extension = ""
+    output_dir = "$target_out_dir/$_link_shared_library_target"
+  }
+
+  bundle_data(_shared_library_bundle_data) {
+    visibility = [ ":$_framework_target" ]
+    forward_variables_from(invoker, [ "testonly" ])
+    sources = [ "$target_out_dir/$_link_shared_library_target/$_output_name" ]
+    outputs = [ "{{bundle_executable_dir}}/$_output_name" ]
+    public_deps = [ ":$_link_shared_library_target" ]
+  }
+
+  _framework_public_config = _target_name + "_public_config"
+  config(_framework_public_config) {
+    visibility = [ ":$_framework_target+link" ]
+    framework_dirs = [ root_out_dir ]
+    frameworks = [ _framework_name ]
+  }
+
+  create_bundle(_framework_target) {
+    forward_variables_from(invoker,
+                           [
+                             "data_deps",
+                             "deps",
+                             "public_deps",
+                             "testonly",
+                           ])
+
+    if (defined(invoker.visibility)) {
+      visibility = invoker.visibility
+      visibility += [ ":$_target_name+link" ]
+    }
+
+    if (!defined(deps)) {
+      deps = []
+    }
+    deps += [ ":$_info_plist_bundle_data" ]
+
+    if (defined(invoker.bundle_deps)) {
+      deps += invoker.bundle_deps
+    }
+
+    if (!defined(public_deps)) {
+      public_deps = []
+    }
+    public_deps += [
+      ":$_framework_package_target",
+      ":$_shared_library_bundle_data",
+    ]
+
+    if (enable_dsyms) {
+      data = [
+        "$root_out_dir/$_output_name.dSYM/Contents/Info.plist",
+        "$root_out_dir/$_output_name.dSYM/Contents/Resources/DWARF/$_output_name",
+      ]
+    }
+
+    bundle_root_dir = _framework_base_dir
+    bundle_contents_dir = _framework_root_dir
+    bundle_resources_dir = "$bundle_contents_dir/Resources"
+    bundle_executable_dir = bundle_contents_dir
+  }
+
+  group(_target_name + "+link") {
+    forward_variables_from(invoker,
+                           [
+                             "public_configs",
+                             "testonly",
+                             "visibility",
+                           ])
+    public_deps = [ ":$_target_name" ]
+    if (!defined(public_configs)) {
+      public_configs = []
+    }
+    public_configs += [ ":$_framework_public_config" ]
+  }
+
+  group(_target_name + "+link_nested") {
+    forward_variables_from(invoker,
+                           [
+                             "public_configs",
+                             "testonly",
+                             "visibility",
+                           ])
+
+    # Depend only on the shared library. Nested code will be a dependency of
+    # the create_bundle target, which would be cyclic with depending on the
+    # framework itself. This is sufficient to link; for loading, a proper
+    # install_name should be set.
+    public_deps = [ ":$_link_shared_library_target" ]
+  }
+}
+
+set_defaults("mac_framework_bundle") {
+  configs = default_shared_library_configs
+}
+
+# Template to create a Mac executable application bundle.
+#
+# Arguments
+#
+#     package_type:
+#         (optional) string, the product package type to create. Options are:
+#             "app" to create a .app bundle (default)
+#             "xpc" to create an .xpc service bundle
+#
+#     info_plist:
+#         (optional) string, path to the Info.plist file that will be used for
+#         the bundle.
+#
+#     info_plist_target:
+#         (optional) string, if the info_plist is generated from an action,
+#         rather than a regular source file, specify the target name in lieu
+#         of info_plist. The two arguments are mutually exclusive.
+#
+#     output_name:
+#         (optional) string, name of the generated app without the
+#         .app suffix. If omitted, defaults to target_name.
+#
+#     extra_configs:
+#         (optional) list of label, additional configs to apply to the
+#         executable target.
+#
+#     remove_configs:
+#         (optional) list of label, default configs to remove from the target.
+#
+#     extra_substitutions:
+#         (optional) string array, 'key=value' pairs for extra fields which are
+#         specified in a source Info.plist template.
+template("mac_app_bundle") {
+  _target_name = target_name
+  _output_name = target_name
+  if (defined(invoker.output_name)) {
+    _output_name = invoker.output_name
+  }
+
+  _package_type = "app"
+  if (defined(invoker.package_type)) {
+    _package_type = invoker.package_type
+  }
+
+  if (_package_type == "app") {
+    _output_extension = "app"
+    _product_type = "com.apple.product-type.application"
+    _write_pkg_info = true
+  } else if (_package_type == "xpc") {
+    _output_extension = "xpc"
+    _product_type = "com.apple.product-type.xpc-service"
+    _write_pkg_info = false
+  } else if (_package_type == "bundle") {
+    _output_extension = "bundle"
+    _product_type = "com.apple.product-type.bundle"
+    _write_pkg_info = false
+  } else {
+    assert(false, "Unsupported packge_type: " + packge_type)
+  }
+
+  _executable_target = target_name + "_executable"
+  _executable_bundle_data = _executable_target + "_bundle_data"
+
+  _info_plist_target = target_name + "_info_plist"
+
+  mac_info_plist(_info_plist_target) {
+    executable_name = _output_name
+    forward_variables_from(invoker,
+                           [
+                             "extra_substitutions",
+                             "info_plist",
+                             "info_plist_target",
+                             "testonly",
+                           ])
+  }
+
+  if (_write_pkg_info) {
+    _pkg_info_target = target_name + "_pkg_info"
+
+    action(_pkg_info_target) {
+      forward_variables_from(invoker, [ "testonly" ])
+      script = "//build/apple/write_pkg_info.py"
+      inputs = [ "//build/apple/plist_util.py" ]
+      sources = get_target_outputs(":$_info_plist_target")
+      outputs = [ "$target_gen_dir/$_pkg_info_target" ]
+      args = [ "--plist" ] + rebase_path(sources, root_build_dir) +
+             [ "--output" ] + rebase_path(outputs, root_build_dir)
+      deps = [ ":$_info_plist_target" ]
+    }
+  }
+
+  executable(_executable_target) {
+    visibility = [ ":$_executable_bundle_data" ]
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "assert_no_deps",
+                             "data_deps",
+                             "info_plist",
+                             "output_name",
+                             "visibility",
+                           ])
+    if (defined(extra_configs)) {
+      configs += extra_configs
+    }
+    if (defined(remove_configs)) {
+      configs -= remove_configs
+    }
+    output_name = _output_name
+    output_dir = "$target_out_dir/$_executable_target"
+  }
+
+  bundle_data(_executable_bundle_data) {
+    visibility = [ ":$_target_name" ]
+    forward_variables_from(invoker, [ "testonly" ])
+    sources = [ "$target_out_dir/$_executable_target/$_output_name" ]
+    outputs = [ "{{bundle_executable_dir}}/$_output_name" ]
+    public_deps = [ ":$_executable_target" ]
+  }
+
+  _info_plist_bundle_data = _info_plist_target + "_bundle_data"
+
+  bundle_data(_info_plist_bundle_data) {
+    forward_variables_from(invoker, [ "testonly" ])
+    visibility = [ ":$_target_name" ]
+    sources = get_target_outputs(":$_info_plist_target")
+    outputs = [ "{{bundle_contents_dir}}/Info.plist" ]
+    public_deps = [ ":$_info_plist_target" ]
+  }
+
+  if (_write_pkg_info) {
+    _pkg_info_bundle_data = _pkg_info_target + "_bundle_data"
+
+    bundle_data(_pkg_info_bundle_data) {
+      forward_variables_from(invoker, [ "testonly" ])
+      visibility = [ ":$_target_name" ]
+      sources = get_target_outputs(":$_pkg_info_target")
+      outputs = [ "{{bundle_contents_dir}}/PkgInfo" ]
+      public_deps = [ ":$_pkg_info_target" ]
+    }
+  }
+
+  create_bundle(_target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "data_deps",
+                             "deps",
+                             "public_deps",
+                             "testonly",
+                           ])
+    if (!defined(deps)) {
+      deps = []
+    }
+    deps += [
+      ":$_executable_bundle_data",
+      ":$_info_plist_bundle_data",
+    ]
+    if (_write_pkg_info) {
+      deps += [ ":$_pkg_info_bundle_data" ]
+    }
+
+    if (enable_dsyms) {
+      data = [
+        "$root_out_dir/$_output_name.dSYM/Contents/Info.plist",
+        "$root_out_dir/$_output_name.dSYM/Contents/Resources/DWARF/$_output_name",
+      ]
+    }
+
+    product_type = _product_type
+    bundle_root_dir = "$root_out_dir/${_output_name}.${_output_extension}"
+    bundle_contents_dir = "$bundle_root_dir/Contents"
+    bundle_resources_dir = "$bundle_contents_dir/Resources"
+    bundle_executable_dir = "$bundle_contents_dir/MacOS"
+  }
+}
+
+# Template to package a loadable_module into a .plugin bundle.
+#
+# This takes no extra arguments that differ from a loadable_module.
+template("mac_plugin_bundle") {
+  assert(defined(invoker.deps),
+         "Dependencies must be specified for $target_name")
+
+  _target_name = target_name
+  _loadable_module_target = _target_name + "_loadable_module"
+  _loadable_module_bundle_data = _loadable_module_target + "_bundle_data"
+
+  _output_name = _target_name
+  if (defined(invoker.output_name)) {
+    _output_name = invoker.output_name
+  }
+
+  loadable_module(_loadable_module_target) {
+    visibility = [ ":$_loadable_module_bundle_data" ]
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "assert_no_deps",
+                             "data_deps",
+                             "output_name",
+                             "visibility",
+                           ])
+    output_dir = "$target_out_dir"
+    output_name = _output_name
+  }
+
+  bundle_data(_loadable_module_bundle_data) {
+    forward_variables_from(invoker, [ "testonly" ])
+    visibility = [ ":$_target_name" ]
+    sources = [ "$target_out_dir/$_output_name.so" ]
+    outputs = [ "{{bundle_executable_dir}}/$_output_name" ]
+    public_deps = [ ":$_loadable_module_target" ]
+  }
+
+  create_bundle(_target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "data_deps",
+                             "deps",
+                             "public_deps",
+                             "testonly",
+                             "visibility",
+                           ])
+    if (!defined(deps)) {
+      deps = []
+    }
+    deps += [ ":$_loadable_module_bundle_data" ]
+
+    if (enable_dsyms) {
+      data = [
+        "$root_out_dir/$_output_name.so.dSYM/Contents/Info.plist",
+        "$root_out_dir/$_output_name.so.dSYM/Contents/Resources/DWARF/$_output_name.so",
+      ]
+    }
+
+    bundle_root_dir = "$root_out_dir/$_output_name.plugin"
+    bundle_contents_dir = "$bundle_root_dir/Contents"
+    bundle_executable_dir = "$bundle_contents_dir/MacOS"
+  }
+}
diff --git a/third_party/libwebrtc/build/config/mips.gni b/third_party/libwebrtc/build/config/mips.gni
new file mode 100644
index 0000000000..8ad7e27911
--- /dev/null
+++ b/third_party/libwebrtc/build/config/mips.gni
@@ -0,0 +1,67 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/v8_target_cpu.gni")
+
+# These are primarily relevant in target_cpu == "mips*" contexts, where
+# MIPS code is being compiled.  But they can also be relevant in the
+# other contexts when the code will change its behavior based on the
+# cpu it wants to generate code for.
+declare_args() {
+  # MIPS MultiMedia Instruction compilation flag.
+  mips_use_mmi = false
+}
+
+if (target_cpu == "mipsel" || v8_target_cpu == "mipsel" ||
+    target_cpu == "mips" || v8_target_cpu == "mips") {
+  declare_args() {
+    # MIPS arch variant. Possible values are:
+    #   "r1"
+    #   "r2"
+    #   "r6"
+    #   "loongson3"
+    mips_arch_variant = "r1"
+
+    # MIPS DSP ASE revision. Possible values are:
+    #   0: unavailable
+    #   1: revision 1
+    #   2: revision 2
+    mips_dsp_rev = 0
+
+    # MIPS SIMD Arch compilation flag.
+    mips_use_msa = false
+
+    # MIPS floating-point ABI. Possible values are:
+    #   "hard": sets the GCC -mhard-float option.
+    #   "soft": sets the GCC -msoft-float option.
+    mips_float_abi = "hard"
+
+    # MIPS32 floating-point register width. Possible values are:
+    #   "fp32": sets the GCC -mfp32 option.
+    #   "fp64": sets the GCC -mfp64 option.
+    #   "fpxx": sets the GCC -mfpxx option.
+    mips_fpu_mode = "fp32"
+  }
+} else if (target_cpu == "mips64el" || v8_target_cpu == "mips64el" ||
+           target_cpu == "mips64" || v8_target_cpu == "mips64") {
+  # MIPS arch variant. Possible values are:
+  #   "r2"
+  #   "r6"
+  #   "loongson3"
+  if (current_os == "android" || target_os == "android") {
+    declare_args() {
+      mips_arch_variant = "r6"
+
+      # MIPS SIMD Arch compilation flag.
+      mips_use_msa = true
+    }
+  } else {
+    declare_args() {
+      mips_arch_variant = "r2"
+
+      # MIPS SIMD Arch compilation flag.
+      mips_use_msa = false
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/nacl/BUILD.gn b/third_party/libwebrtc/build/config/nacl/BUILD.gn
new file mode 100644
index 0000000000..89fbf85aa5
--- /dev/null
+++ b/third_party/libwebrtc/build/config/nacl/BUILD.gn
@@ -0,0 +1,143 @@
+# Copyright (c) 2014 The Native Client Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/nacl/config.gni")
+
+# Native Client Definitions
+config("nacl_defines") {
+  if (is_linux || is_chromeos || is_android || is_nacl) {
+    defines = [
+      "_POSIX_C_SOURCE=199506",
+      "_XOPEN_SOURCE=600",
+      "_GNU_SOURCE=1",
+      "__STDC_LIMIT_MACROS=1",
+    ]
+  } else if (is_win) {
+    defines = [ "__STDC_LIMIT_MACROS=1" ]
+  }
+
+  if (target_cpu == "pnacl" && !is_nacl_nonsfi) {
+    # TODO: Remove the following definition once NACL_BUILD_ARCH and
+    # NACL_BUILD_SUBARCH are defined by the PNaCl toolchain.
+    defines += [ "NACL_BUILD_ARCH=pnacl" ]
+  }
+}
+
+config("nexe_defines") {
+  defines = [
+    "DYNAMIC_ANNOTATIONS_ENABLED=1",
+    "DYNAMIC_ANNOTATIONS_PREFIX=NACL_",
+  ]
+}
+
+config("nacl_warnings") {
+  if (is_win) {
+    # Some NaCl code uses forward declarations of static const variables,
+    # with initialized definitions later on.  (The alternative would be
+    # many, many more forward declarations of everything used in that
+    # const variable's initializer before the definition.)  The Windows
+    # compiler is too stupid to notice that there is an initializer later
+    # in the file, and warns about the forward declaration.
+    cflags = [ "/wd4132" ]
+  }
+}
+
+# The base target that all targets in the NaCl build should depend on.
+# This allows configs to be modified for everything in the NaCl build, even when
+# the NaCl build is composed into the Chrome build.  (GN has no functionality to
+# add flags to everything in //native_client, having a base target works around
+# that limitation.)
+source_set("nacl_base") {
+  public_configs = [
+    ":nacl_defines",
+    ":nacl_warnings",
+  ]
+  if (current_os == "nacl") {
+    public_configs += [ ":nexe_defines" ]
+  }
+}
+
+config("compiler") {
+  configs = []
+  cflags = []
+  ldflags = []
+  libs = []
+
+  if (is_clang && target_cpu != "pnacl") {
+    # -no-integrated-as is the default in nacl-clang for historical
+    # compatibility with inline assembly code and so forth.  But there
+    # are no such cases in Chromium code, and -integrated-as is nicer in
+    # general.  Moreover, the IRT must be built using LLVM's assembler
+    # on x86-64 to preserve sandbox base address hiding.  Use it
+    # everywhere for consistency (and possibly quicker builds).
+    cflags += [ "-integrated-as" ]
+  }
+  if (is_nacl_nonsfi) {
+    cflags += [ "--pnacl-allow-translate" ]
+    ldflags += [
+      "--pnacl-allow-translate",
+      "--pnacl-allow-native",
+      "-Wl,--noirt",
+      "-Wt,--noirt",
+      "-Wt,--noirtshim",
+
+      # The clang driver automatically injects -lpthread when using libc++, but
+      # the toolchain doesn't have it yet.  To get around this, use
+      # -nodefaultlibs and make each executable target depend on
+      # "//native_client/src/nonsfi/irt:nacl_sys_private".
+      "-nodefaultlibs",
+    ]
+    libs += [
+      "c++",
+      "m",
+      "c",
+      "pnaclmm",
+    ]
+    include_dirs = [ "//native_client/src/public/linux_syscalls" ]
+  }
+
+  asmflags = cflags
+}
+
+config("compiler_codegen") {
+  cflags = []
+
+  if (is_nacl_irt) {
+    cflags += [
+      # A debugger should be able to unwind IRT call frames.  This is
+      # the default behavior on x86-64 and when compiling C++ with
+      # exceptions enabled; the change is for the benefit of x86-32 C.
+      # The frame pointer is unnecessary when unwind tables are used.
+      "-fasynchronous-unwind-tables",
+      "-fomit-frame-pointer",
+    ]
+
+    if (target_cpu == "x86") {
+      # The x86-32 IRT needs to be callable with an under-aligned
+      # stack; so we disable SSE instructions, which can fault on
+      # misaligned addresses.  See
+      # https://code.google.com/p/nativeclient/issues/detail?id=3935
+      cflags += [
+        "-mstackrealign",
+        "-mno-sse",
+      ]
+    }
+  }
+
+  asmflags = cflags
+}
+
+config("irt_optimize") {
+  cflags = [
+    # Optimize for space, keep the IRT nexe small.
+    "-Os",
+
+    # These are omitted from non-IRT libraries to keep the libraries
+    # themselves small.
+    "-ffunction-sections",
+    "-fdata-sections",
+  ]
+
+  ldflags = [ "-Wl,--gc-sections" ]
+}
diff --git a/third_party/libwebrtc/build/config/nacl/config.gni b/third_party/libwebrtc/build/config/nacl/config.gni
new file mode 100644
index 0000000000..9ebdb39c35
--- /dev/null
+++ b/third_party/libwebrtc/build/config/nacl/config.gni
@@ -0,0 +1,61 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  # Native Client supports multiple toolchains:
+  #   - nacl_glibc, based on gcc and glibc.
+  #   - pnacl_newlib, based on llvm 3.7 and newlib (default).
+  #   - saigo_newlib, based on llvm 12+ and newlib.
+
+  # True if nacl_glibc is used.
+  is_nacl_glibc = false
+
+  # True if saigo_newlib is used.
+  is_nacl_saigo = false
+}
+
+is_nacl_irt = false
+is_nacl_nonsfi = false
+
+nacl_toolchain_dir = "//native_client/toolchain/${host_os}_x86"
+
+if (is_nacl_glibc) {
+  if (target_cpu == "x86" || target_cpu == "x64") {
+    nacl_toolchain_package = "nacl_x86_glibc"
+  } else if (target_cpu == "arm") {
+    nacl_toolchain_package = "nacl_arm_glibc"
+  }
+} else {
+  nacl_toolchain_package = "pnacl_newlib"
+}
+
+if (target_cpu == "pnacl") {
+  _nacl_tuple = "pnacl"
+} else if (target_cpu == "x86" || target_cpu == "x64") {
+  _nacl_tuple = "x86_64-nacl"
+} else if (target_cpu == "arm") {
+  _nacl_tuple = "arm-nacl"
+} else if (target_cpu == "mipsel") {
+  _nacl_tuple = "mipsel-nacl"
+} else {
+  # In order to allow this file to be included unconditionally
+  # from build files that can't depend on //components/nacl/features.gni
+  # we provide a dummy value that should be harmless if nacl isn't needed.
+  # If nacl *is* needed this will result in a real error, indicating that
+  # people need to set the toolchain path correctly.
+  _nacl_tuple = "unknown"
+}
+
+nacl_toolchain_bindir = "${nacl_toolchain_dir}/${nacl_toolchain_package}/bin"
+nacl_toolchain_tooldir =
+    "${nacl_toolchain_dir}/${nacl_toolchain_package}/${_nacl_tuple}"
+nacl_toolprefix = "${nacl_toolchain_bindir}/${_nacl_tuple}-"
+
+nacl_irt_toolchain = "//build/toolchain/nacl:irt_" + target_cpu
+is_nacl_irt = current_toolchain == nacl_irt_toolchain
+
+# Non-SFI mode is a lightweight sandbox used by Chrome OS for running ARC
+# applications.
+nacl_nonsfi_toolchain = "//build/toolchain/nacl:newlib_pnacl_nonsfi"
+is_nacl_nonsfi = current_toolchain == nacl_nonsfi_toolchain
diff --git a/third_party/libwebrtc/build/config/nacl/rules.gni b/third_party/libwebrtc/build/config/nacl/rules.gni
new file mode 100644
index 0000000000..42bb248357
--- /dev/null
+++ b/third_party/libwebrtc/build/config/nacl/rules.gni
@@ -0,0 +1,180 @@
+# Copyright 2015 The Native Client Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/nacl/config.gni")
+
+# Generate a nmf file
+#
+# Native Client Manifest (nmf) is a JSON file that tells the browser where to
+# download and load Native Client application files and libraries.
+#
+# Variables:
+#   executables: .nexe/.pexe/.bc executables to generate nmf for
+#   lib_prefix: path to prepend to shared libraries in the nmf
+#   nmf: the name and the path of the output file
+#   nmfflags: additional flags for the nmf generator
+#   stage_dependencies: directory for staging libraries
+template("generate_nmf") {
+  assert(defined(invoker.executables), "Must define executables")
+  assert(defined(invoker.nmf), "Must define nmf")
+
+  action(target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "deps",
+                             "data_deps",
+                             "executables",
+                             "lib_prefix",
+                             "nmf",
+                             "nmfflags",
+                             "public_deps",
+                             "stage_dependencies",
+                             "testonly",
+                             "visibility",
+                           ])
+    if (!defined(nmfflags)) {
+      nmfflags = []
+    }
+
+    # TODO(phosek): Remove this conditional once
+    # https://bugs.chromium.org/p/nativeclient/issues/detail?id=4339 is
+    # resolved.
+    if (target_cpu == "pnacl") {
+      objdump = rebase_path("${nacl_toolchain_bindir}/x86_64-nacl-objdump")
+    } else {
+      objdump = rebase_path("${nacl_toolprefix}objdump")
+    }
+    if (host_os == "win") {
+      objdump += ".exe"
+    }
+
+    script = "//native_client_sdk/src/tools/create_nmf.py"
+    inputs = [ objdump ]
+    sources = executables
+    outputs = [ nmf ]
+    if (is_nacl_glibc) {
+      if (defined(stage_dependencies)) {
+        nmfflags += [ "--stage-dependencies=" +
+                      rebase_path(stage_dependencies, root_build_dir) ]
+        lib_path = stage_dependencies
+      } else {
+        lib_path = root_build_dir
+      }
+      if (defined(lib_prefix)) {
+        nmfflags += [ "--lib-prefix=" + lib_prefix ]
+        lib_path += "/${lib_prefix}"
+      }
+
+      # Starts empty so the code below can use += everywhere.
+      data = []
+
+      nmfflags +=
+          [ "--library-path=" + rebase_path(root_out_dir, root_build_dir) ]
+
+      # NOTE: There is no explicit dependency for the lib directory
+      # (lib32 and lib64 for x86/x64) created in the product directory.
+      # They are created as a side-effect of nmf creation.
+      if (target_cpu != "x86" && target_cpu != "x64") {
+        nmfflags +=
+            [ "--library-path=" +
+              rebase_path("${nacl_toolchain_tooldir}/lib", root_build_dir) ]
+        if (target_cpu == "arm") {
+          data += [ "${lib_path}/libarm/" ]
+        } else {
+          data += [ "${lib_path}/lib/" ]
+        }
+      } else {
+        # For x86-32, the lib/ directory is called lib32/ instead.
+        if (target_cpu == "x86") {
+          nmfflags +=
+              [ "--library-path=" +
+                rebase_path("${nacl_toolchain_tooldir}/lib32", root_build_dir) ]
+          data += [ "${lib_path}/lib32/" ]
+        }
+
+        # x86-32 Windows needs to build both x86-32 and x86-64 NaCl
+        # binaries into the same nmf covering both architectures.  That
+        # gets handled at a higher level (see the nacl_test_data template),
+        # so a single generate_nmf invocation gets both x86-32 and x86-64
+        # nexes listed in executables.
+        if (target_cpu == "x64" || target_os == "win") {
+          # For x86-64, the lib/ directory is called lib64/ instead
+          # when copied by create_nmf.py.
+          glibc_tc = "//build/toolchain/nacl:glibc"
+          assert(current_toolchain == "${glibc_tc}_${target_cpu}")
+          if (target_cpu == "x64") {
+            x64_out_dir = root_out_dir
+          } else {
+            x64_out_dir = get_label_info(":${target_name}(${glibc_tc}_x64)",
+                                         "root_out_dir")
+          }
+          nmfflags += [
+            "--library-path=" + rebase_path(x64_out_dir, root_build_dir),
+            "--library-path=" +
+                rebase_path("${nacl_toolchain_tooldir}/lib", root_build_dir),
+          ]
+          data += [ "${lib_path}/lib64/" ]
+        }
+      }
+    }
+    args = [
+             "--no-default-libpath",
+             "--objdump=" + rebase_path(objdump, root_build_dir),
+             "--output=" + rebase_path(nmf, root_build_dir),
+           ] + nmfflags + rebase_path(sources, root_build_dir)
+    if (is_nacl_glibc && target_cpu == "arm") {
+      deps += [ "//native_client/src/untrusted/elf_loader:elf_loader" ]
+    }
+  }
+}
+
+# Generate a nmf file for Non-SFI tests
+#
+# Non-SFI tests use a different manifest format from regular Native Client and
+# as such requires a different generator.
+#
+# Variables:
+#   executable: Non-SFI .nexe executable to generate nmf for
+#   nmf: the name and the path of the output file
+#   nmfflags: additional flags for the nmf generator
+template("generate_nonsfi_test_nmf") {
+  assert(defined(invoker.executable), "Must define executable")
+  assert(defined(invoker.nmf), "Must define nmf")
+
+  action(target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "deps",
+                             "data_deps",
+                             "executable",
+                             "nmf",
+                             "testonly",
+                             "public_deps",
+                             "visibility",
+                           ])
+
+    script = "//ppapi/tests/create_nonsfi_test_nmf.py"
+    sources = [ executable ]
+    outputs = [ nmf ]
+
+    # NOTE: We use target_cpu rather than target_cpu on purpose because
+    # target_cpu is always going to be pnacl for Non-SFI, but the Non-SFI
+    # .nexe executable is always translated to run on the target machine.
+    if (target_cpu == "x86") {
+      arch = "x86-32"
+    } else if (target_cpu == "x64") {
+      arch = "x86-64"
+    } else {
+      arch = target_cpu
+    }
+    args = [
+      "--program=" + rebase_path(executable, root_build_dir),
+      "--arch=${arch}",
+      "--output=" + rebase_path(nmf, root_build_dir),
+    ]
+    if (defined(invoker.nmfflags)) {
+      args += invoker.nmfflags
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/ozone.gni b/third_party/libwebrtc/build/config/ozone.gni
new file mode 100644
index 0000000000..bf6eb78272
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ozone.gni
@@ -0,0 +1,152 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chromecast_build.gni")
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/toolchain/toolchain.gni")
+
+declare_args() {
+  # Indicates if Ozone is enabled. Ozone is a low-level library layer for Linux
+  # that does not require X11.
+  use_ozone =
+      is_chromeos || (is_chromecast && !is_android) || is_fuchsia || is_linux || is_bsd
+}
+
+declare_args() {
+  # Ozone extra platforms file path. Can be overridden to build out of
+  # tree ozone platforms.
+  ozone_extra_path = "//build/config/ozone_extra.gni"
+
+  # Select platforms automatically. Turn this off for manual control.
+  ozone_auto_platforms = use_ozone
+
+  # TODO(petermcneeley): Backwards compatiblity support for VM images.
+  # Remove when deprecated. (https://crbug.com/1122009)
+  ozone_platform_gbm = -1
+
+  # Enable explicit apitrace (https://apitrace.github.io) loading.
+  # This requires apitrace library with additional bindings.
+  # See ChromeOS package for details:
+  # https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2659419
+  # Chrome will not start without an apitrace.so library.
+  # Trace will be saved to /tmp/gltrace.dat file by default. You can
+  # override it at run time with TRACE_FILE=<path> environment variable.
+  enable_opengl_apitrace = false
+}
+
+declare_args() {
+  # The platform that will used at runtime by default. This can be overridden
+  # with the command line flag --ozone-platform=<platform>.
+  ozone_platform = ""
+
+  # Compile the 'cast' platform.
+  ozone_platform_cast = false
+
+  # Compile the 'drm' platform.
+  ozone_platform_drm = false
+
+  # Compile the 'headless' platform.
+  ozone_platform_headless = false
+
+  # Compile the 'scenic' platform.
+  ozone_platform_scenic = false
+
+  # Compile the 'flatland' platform.
+  ozone_platform_flatland = false
+
+  # Compile the 'x11' platform.
+  ozone_platform_x11 = false
+
+  # Compile the 'wayland' platform.
+  ozone_platform_wayland = false
+
+  # Compile the 'windows' platform.
+  ozone_platform_windows = false
+
+  if (ozone_auto_platforms) {
+    # Use headless as the default platform unless modified below.
+    ozone_platform = "headless"
+    ozone_platform_headless = true
+
+    if (is_cast_audio_only) {
+      # Just use headless for audio-only Cast platforms.
+    } else if (is_chromecast && !is_fuchsia) {
+      # Enable the Cast ozone platform on all A/V Cast builds except Fuchsia.
+      ozone_platform_cast = true
+
+      # For visual desktop Chromecast builds, override the default "headless"
+      # platform with --ozone-platform=x11.
+      # TODO(halliwell): Create a libcast_graphics implementation for desktop
+      # using X11, and disable this platform.
+      if (is_cast_desktop_build && !is_cast_audio_only) {
+        ozone_platform_x11 = true
+      } else {
+        ozone_platform = "cast"
+      }
+    } else if (is_chromeos_ash) {
+      ozone_platform = "x11"
+      ozone_platform_drm = true
+      ozone_platform_x11 = true
+    } else if (is_chromeos_lacros) {
+      ozone_platform = "wayland"
+      ozone_platform_wayland = true
+    } else if (is_linux || is_bsd) {
+      ozone_platform = "x11"
+      ozone_platform_wayland = true
+      ozone_platform_x11 = true
+    } else if (is_win) {
+      ozone_platform = "windows"
+      ozone_platform_windows = true
+    } else if (is_fuchsia) {
+      ozone_platform = "scenic"
+      ozone_platform_scenic = true
+      ozone_platform_flatland = true
+    }
+  }
+
+  # TODO(petermcneeley): Backwards compatiblity support for VM images.
+  # Remove when deprecated. (https://crbug.com/1122009)
+  if (ozone_platform_gbm != -1) {
+    ozone_platform_drm = ozone_platform_gbm
+  }
+}
+
+declare_args() {
+  # Deprecated. Ozone/X11 is default path on Linux now. However, there are still
+  # some components like remoting, angle, webrtc (desktop capture) that relies
+  # on this gn arg and on the USE_X11 define. This will be gradually removed
+  # once all the other places are fixed.
+  # TODO(1096425): remove use_x11.
+  use_x11 =
+      ozone_platform_x11 && (is_linux || is_bsd) && !is_chromecast && !is_chromeos_lacros
+}
+
+import(ozone_extra_path)
+
+_ozone_extra_directory = get_path_info(ozone_extra_path, "dir")
+
+# Extra paths to add to targets visibility list.
+ozone_external_platform_visibility = [ "$_ozone_extra_directory/*" ]
+
+if (is_a_target_toolchain) {
+  assert(
+      use_ozone || !(ozone_platform_cast || ozone_platform_drm ||
+                         ozone_platform_flatland || ozone_platform_headless ||
+                         ozone_platform_x11 || ozone_platform_wayland ||
+                         ozone_platform_windows || ozone_platform_scenic),
+      "Must set use_ozone to select ozone platforms")
+}
+
+# TODO(petermcneeley): Backwards compatiblity support for VM images.
+# Remove when deprecated. (https://crbug.com/1122009)
+
+assert(ozone_platform_gbm == -1 || ozone_platform_drm == ozone_platform_gbm)
+
+ozone_platform_gbm = ozone_platform_drm
+
+if (ozone_platform == "gbm") {
+  ozone_platform = "drm"
+}
+
+assert(use_x11 == ozone_platform_x11 || !is_linux || !is_bsd || is_chromecast)
diff --git a/third_party/libwebrtc/build/config/ozone_extra.gni b/third_party/libwebrtc/build/config/ozone_extra.gni
new file mode 100644
index 0000000000..57fa791354
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ozone_extra.gni
@@ -0,0 +1,24 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This list contains the name of external platforms that are passed to the
+# --ozone-platform command line argument or used for the ozone_platform build
+# config. For example ozone_external_platforms = [ "foo1", "foo2", ... ]
+ozone_external_platforms = []
+
+# This list contains dependencies for external platforms. Typically, the Ozone
+# implementations are placed into ui/ozone/platform/ and so this will look
+# something like:
+# ozone_external_platform_deps = [ "platform/foo1", "platform/foo_2", ... ]
+ozone_external_platform_deps = []
+
+# If a platform has unit tests, the corresponding source_set can be listed here
+# so that they get included into ozone_unittests.
+# ozone_external_platform_test_deps = [ "platform/foo1:foo1_unitests", ... ]
+ozone_external_platform_test_deps = []
+
+# If a platform has test support files for ui, the corresponding source_set can
+# be listed here so that they get included into ui_test_support.
+# ozone_external_platform_ui_test_support_deps = [ "platform/foo1:ui_test_support", ... ]
+ozone_external_platform_ui_test_support_deps = []
diff --git a/third_party/libwebrtc/build/config/pch.gni b/third_party/libwebrtc/build/config/pch.gni
new file mode 100644
index 0000000000..efc8a3be36
--- /dev/null
+++ b/third_party/libwebrtc/build/config/pch.gni
@@ -0,0 +1,15 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/toolchain/goma.gni")
+import("//build/toolchain/rbe.gni")
+
+declare_args() {
+  # Precompiled header file support is by default available,
+  # but for distributed build system uses (like goma or rbe) or when
+  # doing official builds.
+  # On Linux it slows down the build, so don't enable it by default.
+  enable_precompiled_headers =
+      !is_official_build && !(use_goma || use_remoteexec) && !is_linux
+}
diff --git a/third_party/libwebrtc/build/config/posix/BUILD.gn b/third_party/libwebrtc/build/config/posix/BUILD.gn
new file mode 100644
index 0000000000..a49254f019
--- /dev/null
+++ b/third_party/libwebrtc/build/config/posix/BUILD.gn
@@ -0,0 +1,59 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/sysroot.gni")
+
+# This build configuration is used by both Fuchsia and POSIX systems.
+assert(is_posix || is_fuchsia)
+
+group("posix") {
+  visibility = [ "//:optimize_gn_gen" ]
+}
+
+# This is included by reference in the //build/config/compiler:runtime_library
+# config that is applied to all targets. It is here to separate out the logic
+# that is Posix-only. Please see that target for advice on what should go in
+# :runtime_library vs. :compiler.
+config("runtime_library") {
+  asmflags = []
+  cflags = []
+  cflags_c = []
+  cflags_cc = []
+  cflags_objc = []
+  cflags_objcc = []
+  defines = []
+  ldflags = []
+
+  if (!is_apple && sysroot != "") {
+    # Pass the sysroot to all C compiler variants, the assembler, and linker.
+    sysroot_flags = [ "--sysroot=" + rebase_path(sysroot, root_build_dir) ]
+    if (is_linux || is_chromeos) {
+      # This is here so that all files get recompiled after a sysroot roll and
+      # when turning the sysroot on or off. (defines are passed via the command
+      # line, and build system rebuilds things when their commandline
+      # changes). Nothing should ever read this define.
+      sysroot_hash =
+          exec_script("//build/linux/sysroot_scripts/install-sysroot.py",
+                      [ "--print-hash=$target_cpu" ],
+                      "trim string",
+                      [ "//build/linux/sysroot_scripts/sysroots.json" ])
+      defines += [ "CR_SYSROOT_HASH=$sysroot_hash" ]
+    }
+    asmflags += sysroot_flags
+    ldflags += sysroot_flags
+
+    # When use_custom_libcxx=true, some -isystem flags get passed to
+    # cflags_cc to set up libc++ include paths.  We want to make sure
+    # the sysroot includes take lower precendence than the libc++
+    # ones, so they must appear later in the command line.  However,
+    # the gn reference states "These variant-specific versions of
+    # cflags* will be appended on the compiler command line after
+    # 'cflags'."  Because of this, we must set the sysroot flags for
+    # all cflags variants instead of using 'cflags' directly.
+    cflags_c += sysroot_flags
+    cflags_cc += sysroot_flags
+    cflags_objc += sysroot_flags
+    cflags_objcc += sysroot_flags
+  }
+}
diff --git a/third_party/libwebrtc/build/config/profiling/OWNERS b/third_party/libwebrtc/build/config/profiling/OWNERS
new file mode 100644
index 0000000000..3d69566fd5
--- /dev/null
+++ b/third_party/libwebrtc/build/config/profiling/OWNERS
@@ -0,0 +1,2 @@
+liaoyuke@chromium.org
+sajjadm@chromium.org
diff --git a/third_party/libwebrtc/build/config/profiling/profiling.gni b/third_party/libwebrtc/build/config/profiling/profiling.gni
new file mode 100644
index 0000000000..9ca3d4aa1b
--- /dev/null
+++ b/third_party/libwebrtc/build/config/profiling/profiling.gni
@@ -0,0 +1,14 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/compiler/pgo/pgo.gni")
+import("//build/config/coverage/coverage.gni")
+
+declare_args() {
+  use_clang_profiling =
+      is_a_target_toolchain && (use_clang_coverage || chrome_pgo_phase == 1)
+}
+
+assert(!use_clang_profiling || is_clang,
+       "Clang Source-based profiling requires clang.")
diff --git a/third_party/libwebrtc/build/config/python.gni b/third_party/libwebrtc/build/config/python.gni
new file mode 100644
index 0000000000..2dfb7e9270
--- /dev/null
+++ b/third_party/libwebrtc/build/config/python.gni
@@ -0,0 +1,161 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Creates a group() that lists Python sources as |data|.
+# Having such targets serves two purposes:
+# 1) Causes files to be included in runtime_deps, so that they are uploaded to
+#    swarming when running tests remotely.
+# 2) Causes "gn analyze" to know about all Python inputs so that tests will be
+#    re-run when relevant Python files change.
+#
+# All non-trivial Python scripts should use a "pydeps" file to track their
+# sources. To create a .pydep file for a target in //example:
+#
+#   build/print_python_deps.py \
+#       --root example \
+#       --output example/$target_name.pydeps \
+#       path/to/your/script.py
+#
+# Keep the .pydep file up-to-date by adding to //PRESUBMIT.py under one of:
+#     _ANDROID_SPECIFIC_PYDEPS_FILES, _GENERIC_PYDEPS_FILES
+#
+# Variables
+#   pydeps_file: Path to .pydeps file to read sources from (optional).
+#   data: Additional files to include in data. E.g. non-.py files needed by the
+#         library, or .py files that are conditionally / lazily imported.
+#
+# Example
+#   python_library("my_library_py") {
+#      pydeps_file = "my_library.pydeps"
+#      data = [ "foo.dat" ]
+#   }
+template("python_library") {
+  group(target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "data_deps",
+                             "deps",
+                             "testonly",
+                             "visibility",
+                           ])
+
+    if (defined(invoker.pydeps_file)) {
+      # Read and filter out comments.
+      _pydeps_lines = read_file(invoker.pydeps_file, "list lines")
+      _pydeps_entries = filter_exclude(_pydeps_lines, [ "#*" ])
+
+      # Dependencies are listed relative to the pydeps file directory, but data
+      # parameter expects paths that are relative to the current BUILD.gn
+      _script_dir = get_path_info(invoker.pydeps_file, "dir")
+      _rebased_pydeps_entries = rebase_path(_pydeps_entries, ".", _script_dir)
+
+      # Even though the .pydep file is not used at runtime, it must be added
+      # so that "gn analyze" will mark the target as changed when .py files
+      # are removed but none are added or modified.
+      data = _rebased_pydeps_entries + [ invoker.pydeps_file ]
+    } else {
+      data = []
+    }
+    if (defined(invoker.data)) {
+      data += invoker.data
+    }
+  }
+}
+
+# A template used for actions that execute a Python script, which has an
+# associated .pydeps file. In other words:
+#
+# - This is very similar to just an action(), except that |script| must point
+#   to a Python script (e.g. "//build/.../foo.py") that has a corresponding
+#   .pydeps file in the source tree (e.g. "//build/.../foo.pydeps").
+#
+# - The .pydeps file contains a list of python dependencies (imports really)
+#   and is generated _manually_ by using a command like:
+#
+#     build/print_python_deps.py --inplace build/android/gyp/foo.py
+#
+# Example
+#   action_with_pydeps("create_foo") {
+#     script = "myscript.py"
+#     args = [...]
+#   }
+template("action_with_pydeps") {
+  action(target_name) {
+    # Ensure that testonly and visibility are forwarded
+    # explicitly, since this performs recursive scope lookups, which is
+    # required to ensure their definition from scopes above the caller are
+    # properly handled. All other variables are forwarded with "*", which
+    # doesn't perform recursive lookups at all. See https://crbug.com/862232
+    forward_variables_from(invoker,
+                           [
+                             "testonly",
+                             "visibility",
+                           ])
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "testonly",
+                             "visibility",
+                           ])
+
+    # Read and filter out comments.
+    # Happens every time the template is instantiated, but benchmarking shows no
+    # perceivable impact on overall 'gn gen' speed.
+    _pydeps_file = invoker.script + "deps"
+
+    _pydeps_lines =
+        read_file(_pydeps_file, "list lines")  # https://crbug.com/1102058
+    _pydeps_entries = filter_exclude(_pydeps_lines, [ "#*" ])
+
+    if (!defined(inputs)) {
+      inputs = []
+    }
+
+    # Dependencies are listed relative to the script directory, but inputs
+    # expects paths that are relative to the current BUILD.gn
+    _script_dir = get_path_info(_pydeps_file, "dir")
+    inputs += rebase_path(_pydeps_entries, ".", _script_dir)
+  }
+}
+
+template("action_foreach_with_pydeps") {
+  action_foreach(target_name) {
+    # Ensure that testonly and visibility are forwarded
+    # explicitly, since this performs recursive scope lookups, which is
+    # required to ensure their definition from scopes above the caller are
+    # properly handled. All other variables are forwarded with "*", which
+    # doesn't perform recursive lookups at all. See https://crbug.com/862232
+    forward_variables_from(invoker,
+                           [
+                             "testonly",
+                             "visibility",
+                           ])
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "testonly",
+                             "visibility",
+                           ])
+
+    # Read and filter out comments.
+    # Happens every time the template is instantiated, but benchmarking shows no
+    # perceivable impact on overall 'gn gen' speed.
+    if (defined(invoker.deps_file)) {
+      _pydeps_file = invoker.deps_file
+    } else {
+      _pydeps_file = invoker.script + "deps"
+    }
+    _pydeps_lines = read_file(_pydeps_file, "list lines")
+    _pydeps_entries = filter_exclude(_pydeps_lines, [ "#*" ])
+
+    if (!defined(inputs)) {
+      inputs = []
+    }
+
+    # Dependencies are listed relative to the script directory, but inputs
+    # expects paths that are relative to the current BUILD.gn
+    _script_dir = get_path_info(script, "dir")
+    inputs += rebase_path(_pydeps_entries, ".", _script_dir)
+  }
+}
diff --git a/third_party/libwebrtc/build/config/rts.gni b/third_party/libwebrtc/build/config/rts.gni
new file mode 100644
index 0000000000..677b3fa2fe
--- /dev/null
+++ b/third_party/libwebrtc/build/config/rts.gni
@@ -0,0 +1,5 @@
+declare_args() {
+  # For more info about RTS, please see
+  # //docs/testing/regression-test-selection.md
+  use_rts = false
+}
diff --git a/third_party/libwebrtc/build/config/rust.gni b/third_party/libwebrtc/build/config/rust.gni
new file mode 100644
index 0000000000..5ff90e6d19
--- /dev/null
+++ b/third_party/libwebrtc/build/config/rust.gni
@@ -0,0 +1,138 @@
+# Copyright 2021 The Chromium Project. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chrome_build.gni")
+import("//build/config/compiler/compiler.gni")
+import("//build/toolchain/toolchain.gni")
+
+if (is_android) {
+  import("//build/config/android/config.gni")
+}
+
+declare_args() {
+  # Whether to allow Rust code to be part of the Chromium *build process*.
+  # This can be used to create Rust test binaries, even if the flag below
+  # is false.
+  enable_rust = false
+
+  # Whether to allow Rust code to contribute to the main Chromium binaries.
+  enable_rust_in_chromium = false
+
+  # Use unverified, untrusted, Rust toolchains from the internet
+  # (which support more platforms and options than those we trust for real
+  # builds).
+  use_unverified_rust_toolchain = false
+
+  # If using an unverified Rust toolchain, use this prefix for where to find
+  # the binaries.
+  rust_bin_dir = ""
+
+  # Use LTO when using rustc to link binaries. Experimental. Currently incompatible
+  # with the options we use in our C++ toolchain to split LTO units.
+  # This has no effect on the production of normal Chrome binaries, which are
+  # linked by clang/lld rather than rustc.
+  # https://crbug.com/1229419
+  use_lto_in_rustc_linking = false
+
+  # Use goma for Rust builds. Experimental. The only known problem is
+  # b/193072381, but then again, we don't expect a build speedup before much
+  # more work is done.
+  use_goma_rust = false
+}
+
+# Rust code may end up being linked into a final executable by:
+# * rustc (which calls lld)
+# * our pre-existing C++ linker invocations
+# At the moment, this first pipeline is incompatible with the ldflags we use
+# for thin LTO, due to some problem in escaping gn rules. There's a further
+# problem with -lunwind on Android.
+# However, Rust code is still useful if it's contributing to our existing
+# C++ linker invocations, so this doesn't disable Rust entirely. It does
+# disable Rust unit test executables, so we do need to fix this.
+# https://crbug.com/1229423
+rustc_can_link = !use_thin_lto && !is_android
+
+# Has a Rust toolchain available in the build by default.
+toolchain_has_official_rust =
+    (!is_nacl &&
+     (is_android && (target_cpu == "arm" || target_cpu == "arm64" ||
+                     target_cpu == "x64" || target_cpu == "x86"))) ||
+    (is_linux && target_cpu == "x64")
+
+toolchain_has_rust = enable_rust && (toolchain_has_official_rust ||
+                                     use_unverified_rust_toolchain)
+
+# We use the Rust linker for building test executables, so we only build them
+# if we're able to use the Rust linker. We could use the C++ linker for this
+# too, we've just not set up GN to do so at the moment.
+build_rust_unit_tests = rustc_can_link
+
+if (use_unverified_rust_toolchain) {
+  assert(rust_bin_dir != "")
+  rust_prefix = "$rust_bin_dir/"
+} else if (toolchain_has_official_rust) {
+  if (host_os != "linux") {
+#     assert(false,
+#            "Attempt to use standard Rust toolchain on an unsupported platform")
+  }
+  rust_prefix =
+      rebase_path("//third_party/android_rust_toolchain/toolchain/1.54.0/bin/")
+}
+
+assert(!toolchain_has_rust || defined(rust_prefix))
+
+# Figure out the Rust target triple (aka 'rust_abi_target')
+#
+# This is here rather than in the toolchain files because it's used
+# also by //build/rust/std to find the Rust standard library.
+#
+# The list of architectures supported by Rust is here:
+# https://doc.rust-lang.org/nightly/rustc/platform-support.html
+# Although most of these are not yet supported by our limited
+# official Rust toolchain (see 'toolchain_has_official_rust' above)
+# it's useful to be able to experiment with our other platforms,
+# so we try to be comprehensive here.
+#
+# It's OK if rust_abi_target is blank. That means we're building for the host
+# and the host stdlib will be used.
+rust_abi_target = ""
+if (is_android) {
+  import("//build/config/android/abi.gni")
+  rust_abi_target = android_abi_target
+  if (rust_abi_target == "arm-linux-androideabi") {
+    # Android clang target specifications mostly match Rust, but this
+    # is an exception
+    rust_abi_target = "armv7-linux-androideabi"
+  }
+} else if (is_fuchsia) {
+  if (target_cpu == "arm64") {
+    rust_abi_target = "aarch64-fuchsia"
+  } else if (target_cpu == "x64") {
+    rust_abi_target = "x86_64-fuchsia"
+  } else {
+    assert(false, "Architecture not supported")
+  }
+} else if (is_ios) {
+  if (target_cpu == "arm64") {
+    rust_abi_target = "aarch64-apple-ios"
+  } else if (target_cpu == "arm") {
+    # There's also an armv7s-apple-ios, which targets a more recent ARMv7
+    # generation CPU found in later iPhones. We'll go with the older one for
+    # maximal compatibility. As we come to support all the different platforms
+    # with Rust, we might want to be more precise here.
+    rust_abi_target = "armv7-apple-ios"
+  } else if (target_cpu == "x64") {
+    rust_abi_target = "x86_64-apple-ios"
+  } else if (target_cpu == "x86") {
+    rust_abi_target = "i386-apple-ios"
+  } else {
+    assert(false, "Architecture not supported")
+  }
+}
+
+# Arguments for Rust invocation.
+# This is common between gcc/clang, Mac and Windows toolchains so specify once,
+# here. This is not the complete command-line: toolchains should add -o
+# and probably --emit arguments too.
+rustc_common_args = "--crate-name {{crate_name}} {{source}} --crate-type {{crate_type}} {{rustflags}} {{rustdeps}} {{externs}}"
diff --git a/third_party/libwebrtc/build/config/sanitizers/BUILD.gn b/third_party/libwebrtc/build/config/sanitizers/BUILD.gn
new file mode 100644
index 0000000000..8c31a78085
--- /dev/null
+++ b/third_party/libwebrtc/build/config/sanitizers/BUILD.gn
@@ -0,0 +1,610 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chrome_build.gni")
+import("//build/config/chromecast_build.gni")
+import("//build/config/clang/clang.gni")
+import("//build/config/sanitizers/sanitizers.gni")
+import("//build/toolchain/toolchain.gni")
+import("//build_overrides/build.gni")
+
+if (is_ios) {
+  import("//build/config/ios/ios_sdk.gni")
+}
+
+# Contains the dependencies needed for sanitizers to link into executables and
+# shared_libraries.
+group("deps") {
+  if (using_sanitizer) {
+    public_configs = [
+      ":sanitizer_options_link_helper",
+
+      # Even when a target removes default_sanitizer_flags, it may be depending
+      # on a library that did not remove default_sanitizer_flags. Thus, we need
+      # to add the ldflags here as well as in default_sanitizer_flags.
+      ":default_sanitizer_ldflags",
+    ]
+    deps = [ ":options_sources" ]
+    if (is_win) {
+      exe = ".exe"
+    } else {
+      exe = ""
+    }
+    data = [
+      "//tools/valgrind/asan/",
+      "$clang_base_path/bin/llvm-symbolizer${exe}",
+    ]
+    if (use_prebuilt_instrumented_libraries ||
+        use_locally_built_instrumented_libraries) {
+      deps += [ "//third_party/instrumented_libraries:deps" ]
+    }
+  }
+  if (is_asan) {
+    # ASAN is supported on iOS but the runtime library depends on the compiler
+    # used (Chromium version of clang versus Xcode version of clang). Only copy
+    # the ASAN runtime on iOS if building with Chromium clang.
+    if (is_win || is_mac || (is_ios && !use_xcode_clang)) {
+      data_deps = [ ":copy_asan_runtime" ]
+    }
+    if (is_mac || (is_ios && !use_xcode_clang)) {
+      public_deps = [ ":asan_runtime_bundle_data" ]
+    }
+  }
+}
+
+assert(!(is_win && is_asan && target_cpu == "x86"),
+       "ASan is only supported in 64-bit builds on Windows.")
+
+if ((is_mac || is_win || (is_ios && !use_xcode_clang)) && is_asan) {
+  if (is_mac) {
+    _clang_rt_dso_path = "darwin/libclang_rt.asan_osx_dynamic.dylib"
+  } else if (is_ios) {
+    _clang_rt_dso_path = "darwin/libclang_rt.asan_iossim_dynamic.dylib"
+  } else if (is_win && target_cpu == "x64") {
+    _clang_rt_dso_path = "windows/clang_rt.asan_dynamic-x86_64.dll"
+  }
+
+  _clang_rt_dso_full_path =
+      "$clang_base_path/lib/clang/$clang_version/lib/$_clang_rt_dso_path"
+
+  if (!is_ios) {
+    copy("copy_asan_runtime") {
+      sources = [ _clang_rt_dso_full_path ]
+      outputs = [ "$root_out_dir/{{source_file_part}}" ]
+    }
+  } else {
+    # On iOS, the runtime library need to be code signed (adhoc signature)
+    # starting with Xcode 8, so use an action instead of a copy on iOS.
+    action("copy_asan_runtime") {
+      script = "//build/config/ios/codesign.py"
+      sources = [ _clang_rt_dso_full_path ]
+      outputs = [ "$root_out_dir/" + get_path_info(sources[0], "file") ]
+      args = [
+        "code-sign-file",
+        "--identity=" + ios_code_signing_identity,
+        "--output=" + rebase_path(outputs[0], root_build_dir),
+        rebase_path(sources[0], root_build_dir),
+      ]
+    }
+  }
+
+  if (is_apple) {
+    bundle_data("asan_runtime_bundle_data") {
+      sources = get_target_outputs(":copy_asan_runtime")
+      outputs = [ "{{bundle_executable_dir}}/{{source_file_part}}" ]
+      public_deps = [ ":copy_asan_runtime" ]
+    }
+  }
+}
+
+config("sanitizer_options_link_helper") {
+  if (is_apple) {
+    ldflags = [ "-Wl,-U,_sanitizer_options_link_helper" ]
+  } else if (!is_win) {
+    ldflags = [ "-Wl,-u_sanitizer_options_link_helper" ]
+  }
+}
+
+static_library("options_sources") {
+  # This is a static_library instead of a source_set, as it shouldn't be
+  # unconditionally linked into targets.
+  visibility = [
+    ":deps",
+    "//:gn_visibility",
+  ]
+  sources = [ "//build/sanitizers/sanitizer_options.cc" ]
+
+  # Don't compile this target with any sanitizer code. It can be called from
+  # the sanitizer runtimes, so instrumenting these functions could cause
+  # recursive calls into the runtime if there is an error.
+  configs -= [ "//build/config/sanitizers:default_sanitizer_flags" ]
+
+  if (is_asan) {
+    if (!defined(asan_suppressions_file)) {
+      asan_suppressions_file = "//build/sanitizers/asan_suppressions.cc"
+    }
+    sources += [ asan_suppressions_file ]
+  }
+
+  if (is_lsan) {
+    if (!defined(lsan_suppressions_file)) {
+      lsan_suppressions_file = "//build/sanitizers/lsan_suppressions.cc"
+    }
+    sources += [ lsan_suppressions_file ]
+  }
+
+  if (is_tsan) {
+    if (!defined(tsan_suppressions_file)) {
+      tsan_suppressions_file = "//build/sanitizers/tsan_suppressions.cc"
+    }
+    sources += [ tsan_suppressions_file ]
+  }
+}
+
+# Applies linker flags necessary when either :deps or :default_sanitizer_flags
+# are used.
+config("default_sanitizer_ldflags") {
+  visibility = [
+    ":default_sanitizer_flags",
+    ":deps",
+
+    # https://crbug.com/360158.
+    "//tools/ipc_fuzzer/fuzzer:ipc_fuzzer",
+  ]
+
+  if (is_posix || is_fuchsia) {
+    ldflags = []
+    if (is_asan) {
+      ldflags += [ "-fsanitize=address" ]
+    }
+    if (is_hwasan) {
+      ldflags += [ "-fsanitize=hwaddress" ]
+    }
+    if (is_lsan) {
+      ldflags += [ "-fsanitize=leak" ]
+    }
+    if (is_tsan) {
+      ldflags += [ "-fsanitize=thread" ]
+    }
+    if (is_msan) {
+      ldflags += [ "-fsanitize=memory" ]
+    }
+    if (is_ubsan || is_ubsan_security) {
+      ldflags += [ "-fsanitize=undefined" ]
+    }
+    if (is_ubsan_null) {
+      ldflags += [ "-fsanitize=null" ]
+    }
+    if (is_ubsan_vptr) {
+      ldflags += [ "-fsanitize=vptr" ]
+    }
+
+    if (use_sanitizer_coverage) {
+      if (use_libfuzzer) {
+        ldflags += [ "-fsanitize=fuzzer-no-link" ]
+        if (is_mac) {
+          # TODO(crbug.com/926588): on macOS, dead code stripping does not work
+          # well with `pc-table` instrumentation enabled by `fuzzer-no-link`.
+          ldflags += [ "-fno-sanitize-coverage=pc-table" ]
+        }
+      } else {
+        ldflags += [ "-fsanitize-coverage=$sanitizer_coverage_flags" ]
+      }
+    }
+
+    if (is_cfi && current_toolchain == default_toolchain) {
+      ldflags += [ "-fsanitize=cfi-vcall" ]
+      if (use_cfi_cast) {
+        ldflags += [
+          "-fsanitize=cfi-derived-cast",
+          "-fsanitize=cfi-unrelated-cast",
+        ]
+      }
+      if (use_cfi_icall) {
+        ldflags += [ "-fsanitize=cfi-icall" ]
+      }
+      if (use_cfi_diag) {
+        ldflags += [ "-fno-sanitize-trap=cfi" ]
+        if (use_cfi_recover) {
+          ldflags += [ "-fsanitize-recover=cfi" ]
+        }
+      }
+    }
+  } else if (is_win) {
+    # Windows directly calls link.exe instead of the compiler driver when
+    # linking.  Hence, pass the runtime libraries instead of -fsanitize=address
+    # or -fsanitize=fuzzer.
+    if (is_asan && is_component_build) {
+      # In the static-library build, ASan libraries are different for
+      # executables and dlls, see link_executable and link_shared_library below.
+      # This here handles only the component build.
+      if (target_cpu == "x64") {
+        # Windows 64-bit.
+        libs = [
+          "clang_rt.asan_dynamic-x86_64.lib",
+          "clang_rt.asan_dynamic_runtime_thunk-x86_64.lib",
+        ]
+      } else {
+        assert(target_cpu == "x86", "WinASan unsupported architecture")
+        libs = [
+          "clang_rt.asan_dynamic-i386.lib",
+          "clang_rt.asan_dynamic_runtime_thunk-i386.lib",
+        ]
+      }
+    }
+    if (use_libfuzzer) {
+      assert(target_cpu == "x64", "LibFuzzer unsupported architecture")
+      assert(!is_component_build,
+             "LibFuzzer only supports non-component builds on Windows")
+
+      # Incremental linking causes padding that messes up SanitizerCoverage.
+      # Don't do it.
+      ldflags = [ "/INCREMENTAL:NO" ]
+    }
+  }
+}
+
+config("common_sanitizer_flags") {
+  cflags = []
+
+  if (using_sanitizer) {
+    assert(is_clang, "sanitizers only supported with clang")
+
+    # Allow non-default toolchains to enable sanitizers in toolchain_args even
+    # in official builds.
+    assert(current_toolchain != default_toolchain || !is_official_build,
+           "sanitizers not supported in official builds")
+
+    cflags += [
+      # Column info in debug data confuses Visual Studio's debugger, so don't
+      # use this by default.  However, clusterfuzz needs it for good
+      # attribution of reports to CLs, so turn it on there.
+      "-gcolumn-info",
+    ]
+
+    # Frame pointers are controlled in //build/config/compiler:default_stack_frames
+  }
+}
+
+config("asan_flags") {
+  cflags = []
+  if (is_asan) {
+    cflags += [ "-fsanitize=address" ]
+    if (is_win) {
+      if (!defined(asan_win_blocklist_path)) {
+        asan_win_blocklist_path =
+            rebase_path("//tools/memory/asan/blocklist_win.txt", root_build_dir)
+      }
+      cflags += [ "-fsanitize-ignorelist=$asan_win_blocklist_path" ]
+    }
+  }
+}
+
+config("link_executable") {
+  if (is_asan && is_win && !is_component_build) {
+    if (target_cpu == "x64") {
+      ldflags = [ "-wholearchive:clang_rt.asan-x86_64.lib" ]
+    } else {
+      assert(target_cpu == "x86", "WinASan unsupported architecture")
+      ldflags = [ "-wholearchive:clang_rt.asan-i386.lib" ]
+    }
+  }
+}
+
+config("link_shared_library") {
+  if (is_asan && is_win && !is_component_build) {
+    if (target_cpu == "x64") {
+      libs = [ "clang_rt.asan_dll_thunk-x86_64.lib" ]
+    } else {
+      assert(target_cpu == "x86", "WinASan unsupported architecture")
+      libs = [ "clang_rt.asan_dll_thunk-i386.lib" ]
+    }
+  }
+}
+
+config("cfi_flags") {
+  cflags = []
+  if (is_cfi && current_toolchain == default_toolchain) {
+    if (!defined(cfi_ignorelist_path)) {
+      cfi_ignorelist_path =
+          rebase_path("//tools/cfi/ignores.txt", root_build_dir)
+    }
+    cflags += [
+      "-fsanitize=cfi-vcall",
+      "-fsanitize-ignorelist=$cfi_ignorelist_path",
+    ]
+
+    if (use_cfi_cast) {
+      cflags += [
+        "-fsanitize=cfi-derived-cast",
+        "-fsanitize=cfi-unrelated-cast",
+      ]
+    }
+
+    if (use_cfi_icall) {
+      cflags += [ "-fsanitize=cfi-icall" ]
+    }
+
+    if (use_cfi_diag) {
+      cflags += [ "-fno-sanitize-trap=cfi" ]
+      if (is_win) {
+        cflags += [
+          "/Oy-",
+          "/Ob0",
+        ]
+      } else {
+        cflags += [
+          "-fno-inline-functions",
+          "-fno-inline",
+          "-fno-omit-frame-pointer",
+          "-O1",
+        ]
+      }
+      if (use_cfi_recover) {
+        cflags += [ "-fsanitize-recover=cfi" ]
+      }
+    }
+  }
+}
+
+# crbug.com/785442: Fix cfi-icall failures for code that casts pointer argument
+# types in function pointer type signatures.
+config("cfi_icall_generalize_pointers") {
+  if (is_clang && is_cfi && use_cfi_icall) {
+    cflags = [ "-fsanitize-cfi-icall-generalize-pointers" ]
+  }
+}
+
+config("cfi_icall_disable") {
+  if (is_clang && is_cfi && use_cfi_icall) {
+    cflags = [ "-fno-sanitize=cfi-icall" ]
+  }
+}
+
+config("coverage_flags") {
+  cflags = []
+  if (use_sanitizer_coverage) {
+    # Used by sandboxing code to allow coverage dump to be written on the disk.
+    defines = [ "SANITIZER_COVERAGE" ]
+
+    if (use_libfuzzer) {
+      cflags += [ "-fsanitize=fuzzer-no-link" ]
+      if (is_mac) {
+        # TODO(crbug.com/926588): on macOS, dead code stripping does not work
+        # well with `pc-table` instrumentation enabled by `fuzzer-no-link`.
+        cflags += [ "-fno-sanitize-coverage=pc-table" ]
+      }
+    } else {
+      cflags += [
+        "-fsanitize-coverage=$sanitizer_coverage_flags",
+        "-mllvm",
+        "-sanitizer-coverage-prune-blocks=1",
+      ]
+      if (target_cpu == "arm") {
+        # http://crbug.com/517105
+        cflags += [
+          "-mllvm",
+          "-sanitizer-coverage-block-threshold=0",
+        ]
+      }
+    }
+  }
+}
+
+config("hwasan_flags") {
+  if (is_hwasan) {
+    asmflags = [ "-fsanitize=hwaddress" ]
+    cflags = [ "-fsanitize=hwaddress" ]
+  }
+}
+
+config("lsan_flags") {
+  if (is_lsan) {
+    cflags = [ "-fsanitize=leak" ]
+  }
+}
+
+config("msan_flags") {
+  if (is_msan) {
+    assert(is_linux || is_chromeos,
+           "msan only supported on linux x86_64/ChromeOS")
+    if (!defined(msan_ignorelist_path)) {
+      msan_ignorelist_path =
+          rebase_path("//tools/msan/ignorelist.txt", root_build_dir)
+    }
+    cflags = [
+      "-fsanitize=memory",
+      "-fsanitize-memory-track-origins=$msan_track_origins",
+      "-fsanitize-ignorelist=$msan_ignorelist_path",
+    ]
+  }
+}
+
+config("tsan_flags") {
+  if (is_tsan) {
+    assert(is_linux || is_chromeos, "tsan only supported on linux x86_64")
+    if (!defined(tsan_ignorelist_path)) {
+      tsan_ignorelist_path =
+          rebase_path("//tools/memory/tsan_v2/ignores.txt", root_build_dir)
+    }
+    cflags = [
+      "-fsanitize=thread",
+      "-fsanitize-ignorelist=$tsan_ignorelist_path",
+    ]
+  }
+}
+
+config("ubsan_flags") {
+  cflags = []
+  if (is_ubsan) {
+    if (!defined(ubsan_ignorelist_path)) {
+      ubsan_ignorelist_path =
+          rebase_path("//tools/ubsan/ignorelist.txt", root_build_dir)
+    }
+    cflags += [
+      "-fsanitize=bool",
+      "-fsanitize=bounds",
+      "-fsanitize=builtin",
+      "-fsanitize=float-divide-by-zero",
+      "-fsanitize=integer-divide-by-zero",
+      "-fsanitize=null",
+      "-fsanitize=object-size",
+      "-fsanitize=return",
+      "-fsanitize=returns-nonnull-attribute",
+      "-fsanitize=shift-exponent",
+      "-fsanitize=signed-integer-overflow",
+      "-fsanitize=unreachable",
+      "-fsanitize=vla-bound",
+      "-fsanitize-ignorelist=$ubsan_ignorelist_path",
+    ]
+
+    # Chromecast ubsan builds fail to compile with these
+    # experimental flags, so only add them to non-chromecast ubsan builds.
+    if (!is_chromecast) {
+      cflags += [
+        # Employ the experimental PBQP register allocator to avoid slow
+        # compilation on files with too many basic blocks.
+        # See http://crbug.com/426271.
+        "-mllvm",
+        "-regalloc=pbqp",
+
+        # Speculatively use coalescing to slightly improve the code generated
+        # by PBQP regallocator. May increase compile time.
+        "-mllvm",
+        "-pbqp-coalescing",
+      ]
+    }
+  }
+}
+
+config("ubsan_no_recover") {
+  if (is_ubsan_no_recover) {
+    cflags = [ "-fno-sanitize-recover=undefined" ]
+  }
+}
+
+config("ubsan_security_flags") {
+  if (is_ubsan_security) {
+    if (!defined(ubsan_security_ignorelist_path)) {
+      ubsan_security_ignorelist_path =
+          rebase_path("//tools/ubsan/security_ignorelist.txt", root_build_dir)
+    }
+    cflags = [
+      "-fsanitize=function",
+      "-fsanitize=shift",
+      "-fsanitize=signed-integer-overflow",
+      "-fsanitize=vla-bound",
+      "-fsanitize-ignorelist=$ubsan_security_ignorelist_path",
+    ]
+  }
+}
+
+config("ubsan_null_flags") {
+  if (is_ubsan_null) {
+    cflags = [ "-fsanitize=null" ]
+  }
+}
+
+config("ubsan_vptr_flags") {
+  if (is_ubsan_vptr) {
+    if (!defined(ubsan_vptr_ignorelist_path)) {
+      ubsan_vptr_ignorelist_path =
+          rebase_path("//tools/ubsan/vptr_ignorelist.txt", root_build_dir)
+    }
+    cflags = [
+      "-fsanitize=vptr",
+      "-fsanitize-ignorelist=$ubsan_vptr_ignorelist_path",
+    ]
+  }
+}
+
+config("fuzzing_build_mode") {
+  if (use_fuzzing_engine && optimize_for_fuzzing) {
+    defines = [ "FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION" ]
+  }
+}
+
+all_sanitizer_configs = [
+  ":common_sanitizer_flags",
+  ":coverage_flags",
+  ":default_sanitizer_ldflags",
+  ":asan_flags",
+  ":cfi_flags",
+  ":hwasan_flags",
+  ":lsan_flags",
+  ":msan_flags",
+  ":tsan_flags",
+  ":ubsan_flags",
+  ":ubsan_no_recover",
+  ":ubsan_null_flags",
+  ":ubsan_security_flags",
+  ":ubsan_vptr_flags",
+  ":fuzzing_build_mode",
+]
+
+# This config is applied by default to all targets. It sets the compiler flags
+# for sanitizer usage, or, if no sanitizer is set, does nothing.
+#
+# This needs to be in a separate config so that targets can opt out of
+# sanitizers (by removing the config) if they desire. Even if a target
+# removes this config, executables & shared libraries should still depend on
+# :deps if any of their dependencies have not opted out of sanitizers.
+# Keep this list in sync with default_sanitizer_flags_but_ubsan_vptr.
+config("default_sanitizer_flags") {
+  configs = all_sanitizer_configs
+
+  if (use_sanitizer_configs_without_instrumentation) {
+    configs = []
+  }
+}
+
+# This config is equivalent to default_sanitizer_flags, but excludes ubsan_vptr.
+# This allows to selectively disable ubsan_vptr, when needed. In particular,
+# if some third_party code is required to be compiled without rtti, which
+# is a requirement for ubsan_vptr.
+config("default_sanitizer_flags_but_ubsan_vptr") {
+  configs = all_sanitizer_configs - [ ":ubsan_vptr_flags" ]
+
+  if (use_sanitizer_configs_without_instrumentation) {
+    configs = []
+  }
+}
+
+config("default_sanitizer_flags_but_coverage") {
+  configs = all_sanitizer_configs - [ ":coverage_flags" ]
+
+  if (use_sanitizer_configs_without_instrumentation) {
+    configs = []
+  }
+}
+
+# This config is used by parts of code that aren't targeted in fuzzers and
+# therefore don't need coverage instrumentation and possibly wont need
+# sanitizer instrumentation either. The config also tells the compiler to
+# perform additional optimizations on the configured code and ensures that
+# linking it to the rest of the binary which is instrumented with sanitizers
+# works. The config only does anything if the build is a fuzzing build.
+config("not_fuzzed") {
+  if (use_fuzzing_engine) {
+    # Since we aren't instrumenting with coverage, code size is less of a
+    # concern, so use a more aggressive optimization level than
+    # optimize_for_fuzzing (-O1). When given multiple optimization flags, clang
+    # obeys the last one, so as long as this flag comes after -O1, it should work.
+    # Since this config will always be depended on after
+    # "//build/config/compiler:default_optimization" (which adds -O1 when
+    # optimize_for_fuzzing is true), -O2 should always be the second flag. Even
+    # though this sounds fragile, it isn't a big deal if it breaks, since proto
+    # fuzzers will still work, they will just be slightly slower.
+    cflags = [ "-O2" ]
+
+    # We need to include this config when we remove default_sanitizer_flags or
+    # else there will be linking errors. We would remove default_sanitizer_flags
+    # here as well, but gn doesn't permit this.
+    if (!is_msan) {
+      # We don't actually remove sanitization when MSan is being used so there
+      # is no need to add default_sanitizer_ldflags in that case
+      configs = [ ":default_sanitizer_ldflags" ]
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/sanitizers/OWNERS b/third_party/libwebrtc/build/config/sanitizers/OWNERS
new file mode 100644
index 0000000000..f6a122b518
--- /dev/null
+++ b/third_party/libwebrtc/build/config/sanitizers/OWNERS
@@ -0,0 +1,3 @@
+inferno@chromium.org
+metzman@chromium.org
+ochang@chromium.org
diff --git a/third_party/libwebrtc/build/config/sanitizers/sanitizers.gni b/third_party/libwebrtc/build/config/sanitizers/sanitizers.gni
new file mode 100644
index 0000000000..3bb41df05f
--- /dev/null
+++ b/third_party/libwebrtc/build/config/sanitizers/sanitizers.gni
@@ -0,0 +1,298 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chrome_build.gni")
+import("//build/config/chromecast_build.gni")
+import("//build/config/chromeos/args.gni")
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/config/profiling/profiling.gni")
+import("//build/toolchain/toolchain.gni")
+
+declare_args() {
+  # Compile for Address Sanitizer to find memory bugs.
+  is_asan = false
+
+  # Compile for Hardware-Assisted Address Sanitizer to find memory bugs
+  # (android/arm64 only).
+  # See http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html
+  is_hwasan = false
+
+  # Compile for Leak Sanitizer to find leaks.
+  is_lsan = false
+
+  # Compile for Memory Sanitizer to find uninitialized reads.
+  is_msan = false
+
+  # Compile for Thread Sanitizer to find threading bugs.
+  is_tsan = false
+
+  # Compile for Undefined Behaviour Sanitizer to find various types of
+  # undefined behaviour (excludes vptr checks).
+  is_ubsan = false
+
+  # Halt the program if a problem is detected.
+  is_ubsan_no_recover = false
+
+  # Compile for Undefined Behaviour Sanitizer's null pointer checks.
+  is_ubsan_null = false
+
+  # Track where uninitialized memory originates from. From fastest to slowest:
+  # 0 - no tracking, 1 - track only the initial allocation site, 2 - track the
+  # chain of stores leading from allocation site to use site.
+  msan_track_origins = 2
+
+  # Use dynamic libraries instrumented by one of the sanitizers instead of the
+  # standard system libraries. Set this flag to build the libraries from source.
+  use_locally_built_instrumented_libraries = false
+
+  # Compile with Control Flow Integrity to protect virtual calls and casts.
+  # See http://clang.llvm.org/docs/ControlFlowIntegrity.html
+  #
+  # TODO(pcc): Remove this flag if/when CFI is enabled in all official builds.
+  #
+  # Disable this on linux-chromeos to avoid using ThinLTO there;
+  # crbug.com/1033839. Similarly, don't use this on ARC builds.
+  #
+  # TODO(crbug.com/1159424): Reassess the validity of the next expression.
+  is_cfi =
+      is_official_build &&
+      (((target_os == "linux" || is_chromeos_lacros) && target_cpu == "x64") ||
+       ((is_chromeos_ash || is_chromeos_lacros) && is_chromeos_device))
+
+  # Enable checks for indirect function calls via a function pointer.
+  # TODO(pcc): remove this when we're ready to add these checks by default.
+  # https://crbug.com/701919
+  #
+  # TODO(crbug.com/1159424): Reassess the validity of the next expression.
+  use_cfi_icall = (target_os == "linux" || is_chromeos_lacros) &&
+                  target_cpu == "x64" && is_official_build
+
+  # Print detailed diagnostics when Control Flow Integrity detects a violation.
+  use_cfi_diag = false
+
+  # Let Control Flow Integrity continue execution instead of crashing when
+  # printing diagnostics (use_cfi_diag = true).
+  use_cfi_recover = false
+
+  # Compile for fuzzing with LLVM LibFuzzer.
+  # See http://www.chromium.org/developers/testing/libfuzzer
+  use_libfuzzer = false
+
+  # Compile for fuzzing with AFL.
+  use_afl = false
+
+  # Compile for fuzzing with an external engine (e.g., Grammarinator).
+  use_external_fuzzing_engine = false
+
+  # Enables core ubsan security features. Will later be removed once it matches
+  # is_ubsan.
+  is_ubsan_security = false
+
+  # Helper variable for testing builds with disabled libfuzzer.
+  # Not for client use.
+  disable_libfuzzer = false
+
+  # Optimize for coverage guided fuzzing (balance between speed and number of
+  # branches). Can be also used to remove non-determinism and other issues.
+  optimize_for_fuzzing = false
+
+  # Value for -fsanitize-coverage flag. Setting this causes
+  # use_sanitizer_coverage to be enabled.
+  # This flag is not used for libFuzzer (use_libfuzzer=true). Instead, we use:
+  #     -fsanitize=fuzzer-no-link
+  # Default value when unset and use_fuzzing_engine=true:
+  #     trace-pc-guard
+  # Default value when unset and use_sanitizer_coverage=true:
+  #     trace-pc-guard,indirect-calls
+  sanitizer_coverage_flags = ""
+
+  # When enabled, only relevant sanitizer defines are set, but compilation
+  # happens with no extra flags. This is useful when in component build
+  # enabling sanitizers only in some of the components.
+  use_sanitizer_configs_without_instrumentation = false
+
+  # When true, seed corpora archives are built.
+  archive_seed_corpus = true
+}
+
+declare_args() {
+  # Enable checks for bad casts: derived cast and unrelated cast.
+  # TODO(krasin): remove this, when we're ready to add these checks by default.
+  # https://crbug.com/626794
+  use_cfi_cast = is_cfi && (is_chromeos_ash || is_chromeos_lacros)
+
+  # Compile for Undefined Behaviour Sanitizer's vptr checks.
+  is_ubsan_vptr = is_ubsan_security
+}
+
+assert(!is_hwasan || (target_os == "android" && target_cpu == "arm64"),
+       "HWASan only supported on Android ARM64 builds.")
+
+# Disable sanitizers for non-target toolchains.
+if (!is_a_target_toolchain) {
+  is_asan = false
+  is_cfi = false
+  is_hwasan = false
+  is_lsan = false
+  is_msan = false
+  is_tsan = false
+  is_ubsan = false
+  is_ubsan_null = false
+  is_ubsan_no_recover = false
+  is_ubsan_security = false
+  is_ubsan_vptr = false
+  msan_track_origins = 0
+  sanitizer_coverage_flags = ""
+  use_afl = false
+  use_cfi_diag = false
+  use_cfi_recover = false
+  use_libfuzzer = false
+  use_locally_built_instrumented_libraries = false
+  use_sanitizer_coverage = false
+} else if (target_cpu != "arm64") {
+  is_hwasan = false
+}
+
+# Use dynamic libraries instrumented by one of the sanitizers instead of the
+# standard system libraries. We have instrumented system libraries for msan,
+# which requires them to prevent false positives.
+# TODO(thakis): Maybe remove this variable.
+use_prebuilt_instrumented_libraries = is_msan
+
+# Whether we are doing a fuzzer build. Normally this should be checked instead
+# of checking "use_libfuzzer || use_afl" because often developers forget to
+# check for "use_afl".
+use_fuzzing_engine = use_libfuzzer || use_afl || use_external_fuzzing_engine
+
+# Args that are in turn dependent on other args must be in a separate
+# declare_args block. User overrides are only applied at the end of a
+# declare_args block.
+declare_args() {
+  # Generates an owners file for each fuzzer test.
+  # TODO(crbug.com/1194183): Remove this arg when finding OWNERS is faster.
+  generate_fuzzer_owners = use_fuzzing_engine
+
+  use_sanitizer_coverage =
+      !use_clang_coverage &&
+      (use_fuzzing_engine || sanitizer_coverage_flags != "")
+
+  # https://crbug.com/1002058: Code coverage works inside the sandbox via the
+  # help of several helper IPCs. Unfortunately, the sandbox-only path does not
+  # work well for fuzzing builds. Since fuzzing builds already disable the
+  # sandbox when dumping coverage, limit the sandbox-only path to non-fuzzing
+  # builds.
+  # Everything is IPC on Fuchsia, so this workaround for code coverage inside
+  # the sandbox does not apply.
+  use_clang_profiling_inside_sandbox =
+      use_clang_profiling && !use_fuzzing_engine && !is_fuchsia
+}
+
+if (use_fuzzing_engine && sanitizer_coverage_flags == "") {
+  sanitizer_coverage_flags = "trace-pc-guard"
+} else if (use_sanitizer_coverage && sanitizer_coverage_flags == "") {
+  sanitizer_coverage_flags = "trace-pc-guard,indirect-calls"
+}
+
+# Whether we are linking against a sanitizer runtime library. Among other
+# things, this changes the default symbol level and other settings in order to
+# prepare to create stack traces "live" using the sanitizer runtime.
+using_sanitizer = is_asan || is_hwasan || is_lsan || is_tsan || is_msan ||
+                  is_ubsan || is_ubsan_null || is_ubsan_vptr ||
+                  is_ubsan_security || use_sanitizer_coverage || use_cfi_diag
+
+assert(!using_sanitizer || is_clang,
+       "Sanitizers (is_*san) require setting is_clang = true in 'gn args'")
+
+assert(!is_cfi || is_clang,
+       "is_cfi requires setting is_clang = true in 'gn args'")
+
+prebuilt_instrumented_libraries_available =
+    is_msan && (msan_track_origins == 0 || msan_track_origins == 2)
+
+if (use_libfuzzer && (is_linux || is_chromeos)) {
+  if (is_asan) {
+    # We do leak checking with libFuzzer on Linux. Set is_lsan for code that
+    # relies on LEAK_SANITIZER define to avoid false positives.
+    is_lsan = true
+  }
+}
+
+# MSan only links Chrome properly in release builds (brettw -- 9/1/2015). The
+# same is possibly true for the other non-ASan sanitizers. But regardless of
+# whether it links, one would normally never run a sanitizer in debug mode.
+# Running in debug mode probably indicates you forgot to set the "is_debug =
+# false" flag in the build args. ASan seems to run fine in debug mode.
+#
+# If you find a use-case where you want to compile a sanitizer in debug mode
+# and have verified it works, ask brettw and we can consider removing it from
+# this condition. We may also be able to find another way to enable your case
+# without having people accidentally get broken builds by compiling an
+# unsupported or unadvisable configurations.
+#
+# For one-off testing, just comment this assertion out.
+assert(!is_debug || !(is_msan || is_ubsan || is_ubsan_null || is_ubsan_vptr),
+       "Sanitizers should generally be used in release (set is_debug=false).")
+
+assert(!is_msan || ((is_linux || is_chromeos) && target_cpu == "x64"),
+       "MSan currently only works on 64-bit Linux and ChromeOS builds.")
+
+assert(!is_lsan || is_asan, "is_lsan = true requires is_asan = true also.")
+
+# ASAN build on Windows is not working in debug mode. Intercepting memory
+# allocation functions is hard on Windows and not yet implemented in LLVM.
+assert(!is_win || !is_debug || !is_asan,
+       "ASan on Windows doesn't work in debug (set is_debug=false).")
+
+# libFuzzer targets can fail to build or behave incorrectly when built without
+# ASAN on Windows.
+assert(!is_win || !use_libfuzzer || is_asan,
+       "use_libfuzzer on Windows requires setting is_asan = true")
+
+# Make sure that if we recover on detection (i.e. not crash), diagnostics are
+# printed.
+assert(!use_cfi_recover || use_cfi_diag,
+       "Only use CFI recovery together with diagnostics.")
+
+# TODO(crbug.com/753445): the use_sanitizer_coverage arg is currently
+# not supported by the Chromium mac_clang_x64 toolchain on iOS distribution.
+# The coverage works with iOS toolchain but it is broken when the mac
+# toolchain is used as a secondary one on iOS distribution. E.g., it should be
+# possible to build the "net" target for iOS with the sanitizer coverage
+# enabled.
+assert(
+    !(use_sanitizer_coverage && is_mac && target_os == "ios"),
+    "crbug.com/753445: use_sanitizer_coverage=true is not supported by the " +
+        "Chromium mac_clang_x64 toolchain on iOS distribution. Please set " +
+        "the argument value to false.")
+
+# Use these lists of configs to disable instrumenting code that is part of a
+# fuzzer, but which isn't being targeted (such as libprotobuf-mutator, *.pb.cc
+# and libprotobuf when they are built as part of a proto fuzzer). Adding or
+# removing these lists does not have any effect if use_libfuzzer or use_afl are
+# not passed as arguments to gn.
+not_fuzzed_remove_configs = []
+not_fuzzed_remove_nonasan_configs = []
+
+if (use_fuzzing_engine) {
+  # Removing coverage should always just work.
+  not_fuzzed_remove_configs += [ "//build/config/coverage:default_coverage" ]
+  not_fuzzed_remove_nonasan_configs +=
+      [ "//build/config/coverage:default_coverage" ]
+
+  if (!is_msan) {
+    # Allow sanitizer instrumentation to be removed if we are not using MSan
+    # since binaries cannot be partially instrumented with MSan.
+    not_fuzzed_remove_configs +=
+        [ "//build/config/sanitizers:default_sanitizer_flags" ]
+
+    # Certain parts of binaries must be instrumented with ASan if the rest of
+    # the binary is. For these, only remove non-ASan sanitizer instrumentation.
+    if (!is_asan) {
+      not_fuzzed_remove_nonasan_configs +=
+          [ "//build/config/sanitizers:default_sanitizer_flags" ]
+
+      assert(not_fuzzed_remove_nonasan_configs == not_fuzzed_remove_configs)
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/sysroot.gni b/third_party/libwebrtc/build/config/sysroot.gni
new file mode 100644
index 0000000000..9d2c828c63
--- /dev/null
+++ b/third_party/libwebrtc/build/config/sysroot.gni
@@ -0,0 +1,81 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This header file defines the "sysroot" variable which is the absolute path
+# of the sysroot. If no sysroot applies, the variable will be an empty string.
+
+import("//build/config/chrome_build.gni")
+
+declare_args() {
+  # The path of the sysroot that is applied when compiling using the target
+  # toolchain.
+  target_sysroot = ""
+
+  # The path to directory containing linux sysroot images.
+  target_sysroot_dir = "//build/linux"
+
+  # The path of the sysroot for the current toolchain. If empty, default
+  # sysroot is used.
+  sysroot = ""
+
+  # Controls default is_linux sysroot. If set to true, and sysroot
+  # is empty, default sysroot is calculated.
+  use_sysroot = target_cpu == "x86" || target_cpu == "x64" ||
+                target_cpu == "arm" || target_cpu == "arm64" ||
+                target_cpu == "mipsel" || target_cpu == "mips64el"
+}
+
+if (sysroot == "") {
+  if (current_os == target_os && target_cpu == target_cpu &&
+      target_sysroot != "") {
+    sysroot = target_sysroot
+  } else if (is_android) {
+    import("//build/config/android/config.gni")
+
+    # Android uses unified headers, and thus a single compile time sysroot
+    sysroot = "$android_toolchain_root/sysroot"
+  } else if ((is_linux || is_chromeos) && use_sysroot) {
+    # By default build against a sysroot image downloaded from Cloud Storage
+    # during gclient runhooks.
+    if (target_cpu == "x64") {
+      sysroot = "$target_sysroot_dir/debian_sid_amd64-sysroot"
+    } else if (target_cpu == "x86") {
+      sysroot = "$target_sysroot_dir/debian_sid_i386-sysroot"
+    } else if (target_cpu == "mipsel") {
+      sysroot = "$target_sysroot_dir/debian_sid_mips-sysroot"
+    } else if (target_cpu == "mips64el") {
+      sysroot = "$target_sysroot_dir/debian_sid_mips64el-sysroot"
+    } else if (target_cpu == "arm") {
+      sysroot = "$target_sysroot_dir/debian_sid_arm-sysroot"
+    } else if (target_cpu == "arm64") {
+      sysroot = "$target_sysroot_dir/debian_sid_arm64-sysroot"
+    } else {
+      assert(false, "No linux sysroot for cpu: $target_cpu")
+    }
+
+    if (sysroot != "") {
+      _script_arch = target_cpu
+      if (_script_arch == "x86") {
+        _script_arch = "i386"
+      } else if (_script_arch == "x64") {
+        _script_arch = "amd64"
+      }
+      #assert(
+      #    exec_script("//build/dir_exists.py",
+      #                [ rebase_path(sysroot) ],
+      #                "string") == "True",
+      #    "Missing sysroot ($sysroot). To fix, run: build/linux/sysroot_scripts/install-sysroot.py --arch=$_script_arch")
+    }
+  } else if (is_mac) {
+    import("//build/config/mac/mac_sdk.gni")
+    sysroot = mac_sdk_path
+  } else if (is_ios) {
+    import("//build/config/ios/ios_sdk.gni")
+    sysroot = ios_sdk_path
+  } else if (is_fuchsia) {
+    if (target_cpu == "arm64" || target_cpu == "x64") {
+      sysroot = "//third_party/fuchsia-sdk/sdk/arch/$target_cpu/sysroot"
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/ui.gni b/third_party/libwebrtc/build/config/ui.gni
new file mode 100644
index 0000000000..1bcc33e192
--- /dev/null
+++ b/third_party/libwebrtc/build/config/ui.gni
@@ -0,0 +1,52 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# =============================================
+#   PLEASE DO NOT ADD MORE FLAGS TO THIS FILE
+# =============================================
+#
+# These flags are effectively global. Your feature flag should go near the
+# code it controls. Most of these items are here now because they control
+# legacy global #defines passed to the compiler (now replaced with generated
+# buildflag headers -- see //build/buildflag_header.gni).
+#
+# These flags are ui-related so should eventually be moved to various places
+# in //ui/*.
+#
+# There is more advice on where to put build flags in the "Build flag" section
+# of //build/config/BUILDCONFIG.gn.
+
+import("//build/config/chromecast_build.gni")
+import("//build/config/chromeos/args.gni")
+import("//build/config/chromeos/ui_mode.gni")
+import("//build/config/ozone.gni")
+
+declare_args() {
+  # Indicates if Aura is enabled. Aura is a low-level windowing library, sort
+  # of a replacement for GDI or GTK.
+  use_aura = is_win || is_linux || is_chromeos || is_fuchsia
+}
+
+declare_args() {
+  # True means the UI is built using the "views" framework.
+  toolkit_views = is_mac || is_win || is_linux || is_chromeos || is_fuchsia
+
+  use_glib = (is_linux || is_bsd) && !is_chromecast
+}
+
+assert(!use_glib || ((is_linux || is_bsd) && !is_chromecast))
+
+use_atk = (is_linux || is_bsd) && !is_chromecast && use_glib &&
+          current_toolchain == default_toolchain
+
+# Whether using Xvfb to provide a display server for a test might be
+# necessary.
+use_xvfb_in_this_config =
+    is_linux || (is_chromeos_lacros && !is_chromeos_device)
+#
+# =============================================
+#   PLEASE DO NOT ADD MORE FLAGS TO THIS FILE
+# =============================================
+#
+# See comment at the top.
diff --git a/third_party/libwebrtc/build/config/v8_target_cpu.gni b/third_party/libwebrtc/build/config/v8_target_cpu.gni
new file mode 100644
index 0000000000..305981f3fa
--- /dev/null
+++ b/third_party/libwebrtc/build/config/v8_target_cpu.gni
@@ -0,0 +1,61 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/sanitizers/sanitizers.gni")
+
+declare_args() {
+  # This arg is used when we want to tell the JIT-generating v8 code
+  # that we want to have it generate for an architecture that is different
+  # than the architecture that v8 will actually run on; we then run the
+  # code under an emulator. For example, we might run v8 on x86, but
+  # generate arm code and run that under emulation.
+  #
+  # This arg is defined here rather than in the v8 project because we want
+  # some of the common architecture-specific args (like arm_float_abi or
+  # mips_arch_variant) to be set to their defaults either if the current_cpu
+  # applies *or* if the v8_current_cpu applies.
+  #
+  # As described below, you can also specify the v8_target_cpu to use
+  # indirectly by specifying a `custom_toolchain` that contains v8_$cpu in the
+  # name after the normal toolchain.
+  #
+  # For example, `gn gen --args="custom_toolchain=...:clang_x64_v8_arm64"`
+  # is equivalent to setting --args=`v8_target_cpu="arm64"`. Setting
+  # `custom_toolchain` is more verbose but makes the toolchain that is
+  # (effectively) being used explicit.
+  #
+  # v8_target_cpu can only be used to target one architecture in a build,
+  # so if you wish to build multiple copies of v8 that are targeting
+  # different architectures, you will need to do something more
+  # complicated involving multiple toolchains along the lines of
+  # custom_toolchain, above.
+  v8_target_cpu = ""
+}
+
+if (v8_target_cpu == "") {
+  if (current_toolchain == "//build/toolchain/linux:clang_x64_v8_arm64") {
+    v8_target_cpu = "arm64"
+  } else if (current_toolchain == "//build/toolchain/linux:clang_x86_v8_arm") {
+    v8_target_cpu = "arm"
+  } else if (current_toolchain ==
+             "//build/toolchain/linux:clang_x86_v8_mips64el") {
+    v8_target_cpu = "mips64el"
+  } else if (current_toolchain ==
+             "//build/toolchain/linux:clang_x86_v8_mipsel") {
+    v8_target_cpu = "mipsel"
+  } else if (is_msan) {
+    # If we're running under a sanitizer, if we configure v8 to generate
+    # code that will be run under a simulator, then the generated code
+    # also gets the benefits of the sanitizer.
+    v8_target_cpu = "arm64"
+  } else {
+    v8_target_cpu = target_cpu
+  }
+}
+
+declare_args() {
+  # This argument is declared here so that it can be overridden in toolchains.
+  # It should never be explicitly set by the user.
+  v8_current_cpu = v8_target_cpu
+}
diff --git a/third_party/libwebrtc/build/config/win/BUILD.gn b/third_party/libwebrtc/build/config/win/BUILD.gn
new file mode 100644
index 0000000000..afeea308df
--- /dev/null
+++ b/third_party/libwebrtc/build/config/win/BUILD.gn
@@ -0,0 +1,610 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/c++/c++.gni")
+import("//build/config/chrome_build.gni")
+import("//build/config/clang/clang.gni")
+import("//build/config/compiler/compiler.gni")
+import("//build/config/sanitizers/sanitizers.gni")
+import("//build/config/win/control_flow_guard.gni")
+import("//build/config/win/visual_studio_version.gni")
+import("//build/timestamp.gni")
+import("//build/toolchain/goma.gni")
+import("//build/toolchain/toolchain.gni")
+
+assert(is_win)
+
+declare_args() {
+  # Turn this on to have the linker output extra timing information.
+  win_linker_timing = false
+
+  # possible values for target_winuwp_version:
+  #   "10" - Windows UWP 10
+  #   "8.1" - Windows RT 8.1
+  #   "8.0" - Windows RT 8.0
+  target_winuwp_version = "10"
+
+  # possible values:
+  #   "app" - Windows Store Applications
+  #   "phone" - Windows Phone Applications
+  #   "system" - Windows Drivers and Tools
+  #   "server" - Windows Server Applications
+  #   "desktop" - Windows Desktop Applications
+  target_winuwp_family = "app"
+
+  # Set this to use clang-style diagnostics format instead of MSVC-style, which
+  # is useful in e.g. Emacs compilation mode.
+  # E.g.:
+  #  Without this, clang emits a diagnostic message like this:
+  #    foo/bar.cc(12,34): error: something went wrong
+  #  and with this switch, clang emits it like this:
+  #    foo/bar.cc:12:34: error: something went wrong
+  use_clang_diagnostics_format = false
+}
+
+# This is included by reference in the //build/config/compiler config that
+# is applied to all targets. It is here to separate out the logic that is
+# Windows-only.
+config("compiler") {
+  if (target_cpu == "x86") {
+    asmflags = [
+      # When /safeseh is specified, the linker will only produce an image if it
+      # can also produce a table of the image's safe exception handlers. This
+      # table specifies for the operating system which exception handlers are
+      # valid for the image. Note that /SAFESEH isn't accepted on the command
+      # line, only /safeseh. This is only accepted by ml.exe, not ml64.exe.
+      "/safeseh",
+    ]
+  }
+
+  cflags = [
+    "/Gy",  # Enable function-level linking.
+    "/FS",  # Preserve previous PDB behavior.
+    "/bigobj",  # Some of our files are bigger than the regular limits.
+    "/utf-8",  # Assume UTF-8 by default to avoid code page dependencies.
+  ]
+
+  if (is_clang) {
+    cflags += [ "/Zc:twoPhase" ]
+  }
+
+  # Force C/C++ mode for the given GN detected file type. This is necessary
+  # for precompiled headers where the same source file is compiled in both
+  # modes.
+  cflags_c = [ "/TC" ]
+  cflags_cc = [ "/TP" ]
+
+  cflags += [
+    # Work around crbug.com/526851, bug in VS 2015 RTM compiler.
+    "/Zc:sizedDealloc-",
+  ]
+
+  if (is_clang) {
+    # Required to make the 19041 SDK compatible with clang-cl.
+    # See https://crbug.com/1089996 issue #2 for details.
+    cflags += [ "/D__WRL_ENABLE_FUNCTION_STATICS__" ]
+
+    # Tell clang which version of MSVC to emulate.
+    cflags += [ "-fmsc-version=1916" ]
+
+    if (is_component_build) {
+      cflags += [
+        # Do not export inline member functions. This makes component builds
+        # faster. This is similar to -fvisibility-inlines-hidden.
+        "/Zc:dllexportInlines-",
+      ]
+    }
+
+    if (target_cpu == "x86") {
+      cflags += [ "-m32" ]
+    } else if (target_cpu == "x64") {
+      cflags += [ "-m64" ]
+    } else if (target_cpu == "arm64") {
+      cflags += [ "--target=arm64-windows" ]
+    } else {
+      assert(false, "unknown target_cpu " + target_cpu)
+    }
+
+    # Chrome currently requires SSE3. Clang supports targeting any Intel
+    # microarchitecture. MSVC only supports a subset of architectures, and the
+    # next step after SSE2 will be AVX.
+    if (target_cpu == "x86" || target_cpu == "x64") {
+      cflags += [ "-msse3" ]
+    }
+
+    if (exec_script("//build/win/use_ansi_codes.py", [], "trim string") ==
+        "True") {
+      cflags += [
+        # cmd.exe doesn't understand ANSI escape codes by default,
+        # so only enable them if something emulating them is around.
+        "-fansi-escape-codes",
+      ]
+    }
+
+    if (use_clang_diagnostics_format) {
+      cflags += [ "/clang:-fdiagnostics-format=clang" ]
+    }
+  }
+
+  # Disabled with cc_wrapper because of https://github.com/mozilla/sccache/issues/264
+  if (use_lld && !use_thin_lto && (is_clang || !use_goma) && cc_wrapper == "") {
+    # /Brepro lets the compiler not write the mtime field in the .obj output.
+    # link.exe /incremental relies on this field to work correctly, but lld
+    # never looks at this timestamp, so it's safe to pass this flag with
+    # lld and get more deterministic compiler output in return.
+    # In LTO builds, the compiler doesn't write .obj files containing mtimes,
+    # so /Brepro is ignored there.
+    cflags += [ "/Brepro" ]
+  }
+
+  ldflags = []
+
+  if (use_lld) {
+    # lld defaults to writing the current time in the pe/coff header.
+    # For build reproducibility, pass an explicit timestamp. See
+    # build/compute_build_timestamp.py for how the timestamp is chosen.
+    # (link.exe also writes the current time, but it doesn't have a flag to
+    # override that behavior.)
+    ldflags += [ "/TIMESTAMP:" + build_timestamp ]
+
+    # Don't look for libpaths in %LIB%, similar to /X in cflags above.
+    ldflags += [ "/lldignoreenv" ]
+  }
+
+  if (!is_debug && !is_component_build) {
+    # Enable standard linker optimizations like GC (/OPT:REF) and ICF in static
+    # release builds.
+    # Release builds always want these optimizations, so enable them explicitly.
+    ldflags += [
+      "/OPT:REF",
+      "/OPT:ICF",
+      "/INCREMENTAL:NO",
+      "/FIXED:NO",
+    ]
+
+    if (use_lld) {
+      # String tail merging leads to smaller binaries, but they don't compress
+      # as well, leading to increased mini_installer size (crbug.com/838449).
+      ldflags += [ "/OPT:NOLLDTAILMERGE" ]
+    }
+
+    # TODO(siggi): Is this of any use anymore?
+    # /PROFILE ensures that the PDB file contains FIXUP information (growing the
+    # PDB file by about 5%) but does not otherwise alter the output binary. It
+    # is enabled opportunistically for builds where it is not prohibited (not
+    # supported when incrementally linking, or using /debug:fastlink).
+    ldflags += [ "/PROFILE" ]
+  }
+
+  # arflags apply only to static_libraries. The normal linker configs are only
+  # set for executable and shared library targets so arflags must be set
+  # elsewhere. Since this is relatively contained, we just apply them in this
+  # more general config and they will only have an effect on static libraries.
+  arflags = [
+    # "No public symbols found; archive member will be inaccessible." This
+    # means that one or more object files in the library can never be
+    # pulled in to targets that link to this library. It's just a warning that
+    # the source file is a no-op.
+    "/ignore:4221",
+  ]
+}
+
+# This is included by reference in the //build/config/compiler:runtime_library
+# config that is applied to all targets. It is here to separate out the logic
+# that is Windows-only. Please see that target for advice on what should go in
+# :runtime_library vs. :compiler.
+config("runtime_library") {
+  cflags = []
+  cflags_cc = []
+
+  # Defines that set up the CRT.
+  defines = [
+    "__STD_C",
+    "_CRT_RAND_S",
+    "_CRT_SECURE_NO_DEPRECATE",
+    "_SCL_SECURE_NO_DEPRECATE",
+  ]
+
+  # Defines that set up the Windows SDK.
+  defines += [
+    "_ATL_NO_OPENGL",
+    "_WINDOWS",
+    "CERT_CHAIN_PARA_HAS_EXTRA_FIELDS",
+    "PSAPI_VERSION=2",
+    "WIN32",
+    "_SECURE_ATL",
+  ]
+
+  if (current_os == "winuwp") {
+    # When targeting Windows Runtime, certain compiler/linker flags are
+    # necessary.
+    defines += [
+      "WINUWP",
+      "__WRL_NO_DEFAULT_LIB__",
+    ]
+    if (target_winuwp_family == "app") {
+      defines += [ "WINAPI_FAMILY=WINAPI_FAMILY_PC_APP" ]
+    } else if (target_winuwp_family == "phone") {
+      defines += [ "WINAPI_FAMILY=WINAPI_FAMILY_PHONE_APP" ]
+    } else if (target_winuwp_family == "system") {
+      defines += [ "WINAPI_FAMILY=WINAPI_FAMILY_SYSTEM" ]
+    } else if (target_winuwp_family == "server") {
+      defines += [ "WINAPI_FAMILY=WINAPI_FAMILY_SERVER" ]
+    } else {
+      defines += [ "WINAPI_FAMILY=WINAPI_FAMILY_DESKTOP_APP" ]
+    }
+    cflags_cc += [ "/EHsc" ]
+
+    # This warning is given because the linker cannot tell the difference
+    # between consuming WinRT APIs versus authoring WinRT within static
+    # libraries as such this warning is always given by the linker. Since
+    # consuming WinRT APIs within a library is legitimate but authoring
+    # WinRT APis is not allowed, this warning is disabled to ignore the
+    # legitimate consumption of WinRT APIs within static library builds.
+    arflags = [ "/IGNORE:4264" ]
+
+    if (target_winuwp_version == "10") {
+      defines += [ "WIN10=_WIN32_WINNT_WIN10" ]
+    } else if (target_winuwp_version == "8.1") {
+      defines += [ "WIN8_1=_WIN32_WINNT_WINBLUE" ]
+    } else if (target_winuwp_version == "8.0") {
+      defines += [ "WIN8=_WIN32_WINNT_WIN8" ]
+    }
+  } else {
+    # When not targeting Windows Runtime, make sure the WINAPI family is set
+    # to desktop.
+    defines += [ "WINAPI_FAMILY=WINAPI_FAMILY_DESKTOP_APP" ]
+  }
+}
+
+# Chromium supports running on Windows 7, but if these constants are set to
+# Windows 7, then newer APIs aren't made available by the Windows SDK.
+# So we set this to Windows 10 and then are careful to check at runtime
+# to only call newer APIs when they're available.
+# Some third-party libraries assume that these defines set what version of
+# Windows is available at runtime. Targets using these libraries need to
+# manually override this config for their compiles.
+config("winver") {
+  defines = [
+    "NTDDI_VERSION=0x0A000000",
+
+    # We can't say `=_WIN32_WINNT_WIN10` here because some files do
+    # `#if WINVER < 0x0600` without including windows.h before,
+    # and then _WIN32_WINNT_WIN10 isn't yet known to be 0x0A00.
+    "_WIN32_WINNT=0x0A00",
+    "WINVER=0x0A00",
+  ]
+}
+
+# Linker flags for Windows SDK setup, this is applied only to EXEs and DLLs.
+config("sdk_link") {
+  assert(target_cpu == "x64" || target_cpu == "x86" || target_cpu == "arm" ||
+             target_cpu == "arm64",
+         "Only supports x64, x86, arm and arm64 CPUs")
+  if (target_cpu == "x64") {
+    ldflags = [ "/MACHINE:X64" ]
+  } else if (target_cpu == "x86") {
+    ldflags = [
+      "/MACHINE:X86",
+      "/SAFESEH",  # Not compatible with x64 so use only for x86.
+      "/largeaddressaware",
+    ]
+  } else if (target_cpu == "arm") {
+    ldflags = [ "/MACHINE:ARM" ]
+  } else if (target_cpu == "arm64") {
+    ldflags = [ "/MACHINE:ARM64" ]
+  }
+
+  vcvars_toolchain_data = exec_script("../../toolchain/win/setup_toolchain.py",
+                                      [
+                                        visual_studio_path,
+                                        windows_sdk_path,
+                                        visual_studio_runtime_dirs,
+                                        current_os,
+                                        target_cpu,
+                                        "none",
+                                      ],
+                                      "scope")
+
+  vc_lib_path = vcvars_toolchain_data.vc_lib_path
+  if (defined(vcvars_toolchain_data.vc_lib_atlmfc_path)) {
+    vc_lib_atlmfc_path = vcvars_toolchain_data.vc_lib_atlmfc_path
+  }
+  vc_lib_um_path = vcvars_toolchain_data.vc_lib_um_path
+
+  lib_dirs = [
+    "$vc_lib_um_path",
+    "$vc_lib_path",
+  ]
+  if (defined(vc_lib_atlmfc_path)) {
+    lib_dirs += [ "$vc_lib_atlmfc_path" ]
+  }
+}
+
+# This default linker setup is provided separately from the SDK setup so
+# targets who want different library configurations can remove this and specify
+# their own.
+config("common_linker_setup") {
+  ldflags = [
+    "/FIXED:NO",
+    "/ignore:4199",
+    "/ignore:4221",
+    "/NXCOMPAT",
+    "/DYNAMICBASE",
+  ]
+
+  if (win_linker_timing) {
+    ldflags += [
+      "/time",
+      "/verbose:incr",
+    ]
+  }
+}
+
+config("default_cfg_compiler") {
+  # Emit table of address-taken functions for Control-Flow Guard (CFG).
+  # This is needed to allow functions to be called by code that is built
+  # with CFG enabled, such as system libraries.
+  # The CFG guards are only emitted if |win_enable_cfg_guards| is enabled.
+  if (is_clang) {
+    if (win_enable_cfg_guards) {
+      cflags = [ "/guard:cf" ]
+    } else {
+      cflags = [ "/guard:cf,nochecks" ]
+    }
+  }
+}
+
+# To disable CFG guards for a target, remove the "default_cfg_compiler"
+# config, and add "disable_guards_cfg_compiler" config.
+config("disable_guards_cfg_compiler") {
+  # Emit table of address-taken functions for Control-Flow Guard (CFG).
+  # This is needed to allow functions to be called by code that is built
+  # with CFG enabled, such as system libraries.
+  if (is_clang) {
+    cflags = [ "/guard:cf,nochecks" ]
+  }
+}
+
+config("cfi_linker") {
+  # Control Flow Guard (CFG)
+  # https://msdn.microsoft.com/en-us/library/windows/desktop/mt637065.aspx
+  # /DYNAMICBASE (ASLR) is turned off in debug builds, therefore CFG cannot be
+  # turned on either.
+  # ASan and CFG leads to slow process startup. Chromium's test runner uses
+  # lots of child processes, so this means things are really slow. Disable CFG
+  # for now. https://crbug.com/846966
+  if (!is_debug && !is_asan) {
+    # Turn on CFG bitmap generation and CFG load config.
+    ldflags = [ "/guard:cf" ]
+  }
+}
+
+# This is a superset of all the delayloads needed for chrome.exe, chrome.dll,
+# chrome_child.dll, and chrome_elf.dll. The linker will automatically ignore
+# anything which is not linked to the binary at all.
+# Most of the dlls are simply not required at startup (or at all, depending
+# on how the browser is used). The following dlls are interconnected and need to
+# be delayloaded together to ensure user32 does not load too early or at all,
+# depending on the process type: user32, gdi32, comctl32, comdlg32, cryptui,
+# d3d9, dwmapi, imm32, msi, ole32, oleacc, rstrtmgr, shell32, shlwapi, and
+# uxtheme.
+# There are some exceptions to this list which need to be declared separately.
+# Some dlls cannot be delayloaded by chrome_child.dll due to the sandbox
+# restrictions that prevent them from being loaded properly. Those dlls are
+# specified in the separate config below.
+# This config should also be used for any test binary whose goal is to run
+# tests with the full browser.
+config("delayloads") {
+  ldflags = [
+    "/DELAYLOAD:api-ms-win-core-winrt-error-l1-1-0.dll",
+    "/DELAYLOAD:api-ms-win-core-winrt-l1-1-0.dll",
+    "/DELAYLOAD:api-ms-win-core-winrt-string-l1-1-0.dll",
+    "/DELAYLOAD:comctl32.dll",
+    "/DELAYLOAD:comdlg32.dll",
+    "/DELAYLOAD:credui.dll",
+    "/DELAYLOAD:cryptui.dll",
+    "/DELAYLOAD:d3d11.dll",
+    "/DELAYLOAD:d3d9.dll",
+    "/DELAYLOAD:dwmapi.dll",
+    "/DELAYLOAD:dxgi.dll",
+    "/DELAYLOAD:dxva2.dll",
+    "/DELAYLOAD:esent.dll",
+    "/DELAYLOAD:gdi32.dll",
+    "/DELAYLOAD:hid.dll",
+    "/DELAYLOAD:imagehlp.dll",
+    "/DELAYLOAD:imm32.dll",
+    "/DELAYLOAD:msi.dll",
+    "/DELAYLOAD:netapi32.dll",
+    "/DELAYLOAD:ncrypt.dll",
+    "/DELAYLOAD:ole32.dll",
+    "/DELAYLOAD:oleacc.dll",
+    "/DELAYLOAD:propsys.dll",
+    "/DELAYLOAD:psapi.dll",
+    "/DELAYLOAD:rpcrt4.dll",
+    "/DELAYLOAD:rstrtmgr.dll",
+    "/DELAYLOAD:setupapi.dll",
+    "/DELAYLOAD:shell32.dll",
+    "/DELAYLOAD:shlwapi.dll",
+    "/DELAYLOAD:urlmon.dll",
+    "/DELAYLOAD:user32.dll",
+    "/DELAYLOAD:usp10.dll",
+    "/DELAYLOAD:uxtheme.dll",
+    "/DELAYLOAD:wer.dll",
+    "/DELAYLOAD:wevtapi.dll",
+    "/DELAYLOAD:wininet.dll",
+    "/DELAYLOAD:winusb.dll",
+    "/DELAYLOAD:wsock32.dll",
+    "/DELAYLOAD:wtsapi32.dll",
+  ]
+}
+
+config("delayloads_not_for_child_dll") {
+  ldflags = [
+    "/DELAYLOAD:advapi32.dll",
+    "/DELAYLOAD:crypt32.dll",
+    "/DELAYLOAD:dbghelp.dll",
+    "/DELAYLOAD:dhcpcsvc.dll",
+    "/DELAYLOAD:dwrite.dll",
+    "/DELAYLOAD:iphlpapi.dll",
+    "/DELAYLOAD:oleaut32.dll",
+    "/DELAYLOAD:secur32.dll",
+    "/DELAYLOAD:uiautomationcore.dll",
+    "/DELAYLOAD:userenv.dll",
+    "/DELAYLOAD:winhttp.dll",
+    "/DELAYLOAD:winmm.dll",
+    "/DELAYLOAD:winspool.drv",
+    "/DELAYLOAD:wintrust.dll",
+    "/DELAYLOAD:ws2_32.dll",
+  ]
+}
+
+# CRT --------------------------------------------------------------------------
+
+# Configures how the runtime library (CRT) is going to be used.
+# See https://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx for a reference of
+# what each value does.
+config("default_crt") {
+  if (is_component_build) {
+    # Component mode: dynamic CRT. Since the library is shared, it requires
+    # exceptions or will give errors about things not matching, so keep
+    # exceptions on.
+    configs = [ ":dynamic_crt" ]
+  } else {
+    if (current_os == "winuwp") {
+      # https://blogs.msdn.microsoft.com/vcblog/2014/06/10/the-great-c-runtime-crt-refactoring/
+      # contains a details explanation of what is happening with the Windows
+      # CRT in Visual Studio releases related to Windows store applications.
+      configs = [ ":dynamic_crt" ]
+    } else {
+      # Desktop Windows: static CRT.
+      configs = [ ":static_crt" ]
+    }
+  }
+}
+
+# Use this to force use of the release CRT when building perf-critical build
+# tools that need to be fully optimized even in debug builds, for those times
+# when the debug CRT is part of the bottleneck. This also avoids *implicitly*
+# defining _DEBUG.
+config("release_crt") {
+  if (is_component_build) {
+    cflags = [ "/MD" ]
+
+    if (use_custom_libcxx) {
+      # On Windows, including libcpmt[d]/msvcprt[d] explicitly links the C++
+      # standard library, which libc++ needs for exception_ptr internals.
+      ldflags = [ "/DEFAULTLIB:msvcprt.lib" ]
+    }
+  } else {
+    cflags = [ "/MT" ]
+    if (use_custom_libcxx) {
+      ldflags = [ "/DEFAULTLIB:libcpmt.lib" ]
+    }
+  }
+}
+
+config("dynamic_crt") {
+  if (is_debug) {
+    # This pulls in the DLL debug CRT and defines _DEBUG
+    cflags = [ "/MDd" ]
+    if (use_custom_libcxx) {
+      ldflags = [ "/DEFAULTLIB:msvcprtd.lib" ]
+    }
+  } else {
+    cflags = [ "/MD" ]
+    if (use_custom_libcxx) {
+      ldflags = [ "/DEFAULTLIB:msvcprt.lib" ]
+    }
+  }
+}
+
+config("static_crt") {
+  if (is_debug) {
+    # This pulls in the static debug CRT and defines _DEBUG
+    cflags = [ "/MTd" ]
+    if (use_custom_libcxx) {
+      ldflags = [ "/DEFAULTLIB:libcpmtd.lib" ]
+    }
+  } else {
+    cflags = [ "/MT" ]
+    if (use_custom_libcxx) {
+      ldflags = [ "/DEFAULTLIB:libcpmt.lib" ]
+    }
+  }
+}
+
+# Subsystem --------------------------------------------------------------------
+
+# This is appended to the subsystem to specify a minimum version.
+if (target_cpu == "x64") {
+  # The number after the comma is the minimum required OS version.
+  # 5.02 = Windows Server 2003.
+  subsystem_version_suffix = ",5.02"
+} else if (target_cpu == "arm64") {
+  # Windows ARM64 requires Windows 10.
+  subsystem_version_suffix = ",10.0"
+} else {
+  # 5.01 = Windows XP.
+  subsystem_version_suffix = ",5.01"
+}
+
+config("console") {
+  ldflags = [ "/SUBSYSTEM:CONSOLE$subsystem_version_suffix" ]
+}
+config("windowed") {
+  ldflags = [ "/SUBSYSTEM:WINDOWS$subsystem_version_suffix" ]
+}
+
+# Incremental linking ----------------------------------------------------------
+
+# Applies incremental linking or not depending on the current configuration.
+config("default_incremental_linking") {
+  # Enable incremental linking for debug builds and all component builds - any
+  # builds where performance is not job one.
+  # TODO(thakis): Always turn this on with lld, no reason not to.
+  if (is_debug || is_component_build) {
+    ldflags = [ "/INCREMENTAL" ]
+    if (use_lld) {
+      # lld doesn't use ilk files and doesn't really have an incremental link
+      # mode; the only effect of the flag is that the .lib file timestamp isn't
+      # updated if the .lib doesn't change.
+      # TODO(thakis): Why pass /OPT:NOREF for lld, but not otherwise?
+      # TODO(thakis): /INCREMENTAL is on by default in link.exe, but not in
+      # lld.
+      ldflags += [ "/OPT:NOREF" ]
+    }
+  } else {
+    ldflags = [ "/INCREMENTAL:NO" ]
+  }
+}
+
+# Character set ----------------------------------------------------------------
+
+# Not including this config means "ansi" (8-bit system codepage).
+config("unicode") {
+  defines = [
+    "_UNICODE",
+    "UNICODE",
+  ]
+}
+
+# Lean and mean ----------------------------------------------------------------
+
+# Some third party code might not compile with WIN32_LEAN_AND_MEAN so we have
+# to have a separate config for it. Remove this config from your target to
+# get the "bloaty and accommodating" version of windows.h.
+config("lean_and_mean") {
+  defines = [ "WIN32_LEAN_AND_MEAN" ]
+}
+
+# Nominmax --------------------------------------------------------------------
+
+# Some third party code defines NOMINMAX before including windows.h, which
+# then causes warnings when it's been previously defined on the command line.
+# For such targets, this config can be removed.
+
+config("nominmax") {
+  defines = [ "NOMINMAX" ]
+}
diff --git a/third_party/libwebrtc/build/config/win/console_app.gni b/third_party/libwebrtc/build/config/win/console_app.gni
new file mode 100644
index 0000000000..cac2ef5d73
--- /dev/null
+++ b/third_party/libwebrtc/build/config/win/console_app.gni
@@ -0,0 +1,18 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/sanitizers/sanitizers.gni")
+
+declare_args() {
+  # If true, builds as a console app (rather than a windowed app), which allows
+  # logging to be printed to the user. This will cause a terminal window to pop
+  # up when the executable is not run from the command line, so should only be
+  # used for development. Only has an effect on Windows builds.
+  win_console_app = false
+}
+
+if (is_win && is_asan) {
+  # AddressSanitizer build should be a console app since it writes to stderr.
+  win_console_app = true
+}
diff --git a/third_party/libwebrtc/build/config/win/control_flow_guard.gni b/third_party/libwebrtc/build/config/win/control_flow_guard.gni
new file mode 100644
index 0000000000..bf6a82af0c
--- /dev/null
+++ b/third_party/libwebrtc/build/config/win/control_flow_guard.gni
@@ -0,0 +1,23 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/sanitizers/sanitizers.gni")
+
+declare_args() {
+  # Set this to true to enable generation of CFG indirect call dispatch
+  # guards.
+  win_enable_cfg_guards = false
+}
+
+if (win_enable_cfg_guards) {
+  # Control Flow Guard (CFG)
+  # https://msdn.microsoft.com/en-us/library/windows/desktop/mt637065.aspx
+  # /DYNAMICBASE (ASLR) is turned off in debug builds, therefore CFG can't be
+  # turned on either.
+  # ASan and CFG leads to slow process startup. Chromium's test runner uses
+  # lots of child processes, so this means things are really slow. Disable CFG
+  # for now. https://crbug.com/846966
+  assert(!is_debug && !is_asan,
+         "CFG does not work well in debug builds or with ASAN")
+}
diff --git a/third_party/libwebrtc/build/config/win/manifest.gni b/third_party/libwebrtc/build/config/win/manifest.gni
new file mode 100644
index 0000000000..e2115083fe
--- /dev/null
+++ b/third_party/libwebrtc/build/config/win/manifest.gni
@@ -0,0 +1,118 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# HOW MANIFESTS WORK IN THE GN BUILD
+#
+# Use the windows_manifest template to declare a manifest generation step.
+# This will combine all listed .manifest files. To link this manifest, just
+# depend on the manifest target from your executable or shared library.
+#
+# This will define an empty placeholder target on non-Windows platforms so
+# the manifest declarations and dependencies do not need to be inside of OS
+# conditionals.
+#
+# A binary can depend on only one manifest target, but the manifest target
+# can depend on many individual .manifest files which will be merged. As a
+# result, only executables and shared libraries should depend on manifest
+# targets. If you want to add a manifest to a component, put the dependency
+# behind a "if (is_component_build)" conditional.
+#
+# Generally you will just want the defaults for the Chrome build. In this case
+# the binary should just depend on one of the targets in //build/win/. There
+# are also individual manifest files in that directory you can reference via
+# the *_manifest variables defined below to pick and choose only some defaults.
+# You might combine these with a custom manifest file to get specific behavior.
+
+# Reference this manifest as a source from windows_manifest targets to get
+# the default Chrome OS compatibility list.
+default_compatibility_manifest = "//build/win/compatibility.manifest"
+
+# Reference this manifest as a source from windows_manifest targets to get
+# the default Chrome common constrols compatibility.
+common_controls_manifest = "//build/win/common_controls.manifest"
+
+# Reference this manifest to request that Windows not perform any elevation
+# when running your program. Otherwise, it might do some autodetection and
+# request elevated privileges from the user. This is normally what you want.
+as_invoker_manifest = "//build/win/as_invoker.manifest"
+
+# An alternative to as_invoker_manifest when you want the application to always
+# elevate.
+require_administrator_manifest = "//build/win/require_administrator.manifest"
+
+# Request the segment heap. See https://crbug.com/1014701 for details.
+declare_args() {
+  enable_segment_heap = false
+}
+segment_heap_manifest = "//build/win/segment_heap.manifest"
+
+# Construct a target to combine the given manifest files into a .rc file.
+#
+# Variables for the windows_manifest template:
+#
+#   sources: (required)
+#     List of source .manifest files to add.
+#
+#   deps: (optional)
+#   visibility: (optional)
+#     Normal meaning.
+#
+# Example:
+#
+#   windows_manifest("doom_melon_manifest") {
+#     sources = [
+#       "doom_melon.manifest",   # Custom values in here.
+#       default_compatibility_manifest,  # Want the normal OS compat list.
+#     ]
+#   }
+#
+#   executable("doom_melon") {
+#     deps = [ ":doom_melon_manifest" ]
+#     ...
+#   }
+
+if (is_win) {
+  template("windows_manifest") {
+    config_name = "${target_name}__config"
+    source_set_name = target_name
+
+    config(config_name) {
+      visibility = [ ":$source_set_name" ]
+      assert(defined(invoker.sources),
+             "\"sources\" must be defined for a windows_manifest target")
+      manifests = []
+      foreach(i, rebase_path(invoker.sources, root_build_dir)) {
+        manifests += [ "/manifestinput:" + i ]
+      }
+      ldflags = [
+                  "/manifest:embed",
+
+                  # We handle UAC by adding explicit .manifest files instead.
+                  "/manifestuac:no",
+                ] + manifests
+    }
+
+    # This source set only exists to add a dep on the invoker's deps and to
+    # add a public_config that sets ldflags on dependents.
+    source_set(source_set_name) {
+      forward_variables_from(invoker, [ "visibility" ])
+      public_configs = [ ":$config_name" ]
+
+      # Apply any dependencies from the invoker to this target, since those
+      # dependencies may have created the input manifest files.
+      forward_variables_from(invoker, [ "deps" ])
+    }
+  }
+} else {
+  # Make a no-op group on non-Windows platforms so windows_manifest
+  # instantiations don't need to be inside windows blocks.
+  template("windows_manifest") {
+    group(target_name) {
+      # Prevent unused variable warnings on non-Windows platforms.
+      assert(invoker.sources != "")
+      assert(!defined(invoker.deps) || invoker.deps != "")
+      assert(!defined(invoker.visibility) || invoker.visibility != "")
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/win/visual_studio_version.gni b/third_party/libwebrtc/build/config/win/visual_studio_version.gni
new file mode 100644
index 0000000000..80eb0355c4
--- /dev/null
+++ b/third_party/libwebrtc/build/config/win/visual_studio_version.gni
@@ -0,0 +1,39 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  # Path to Visual Studio. If empty, the default is used which is to use the
+  # automatic toolchain in depot_tools. If set, you must also set the
+  # visual_studio_version and wdk_path.
+  visual_studio_path = ""
+
+  # Version of Visual Studio pointed to by the visual_studio_path.
+  # Currently always "2015".
+  visual_studio_version = ""
+
+  # Directory of the Windows driver kit. If visual_studio_path is empty, this
+  # will be auto-filled.
+  wdk_path = ""
+
+  # Full path to the Windows SDK, not including a backslash at the end.
+  # This value is the default location, override if you have a different
+  # installation location.
+  windows_sdk_path = "C:\Program Files (x86)\Windows Kits\10"
+}
+
+if (visual_studio_path == "") {
+  toolchain_data =
+      exec_script("../../vs_toolchain.py", [ "get_toolchain_dir" ], "scope")
+  visual_studio_path = toolchain_data.vs_path
+  windows_sdk_path = toolchain_data.sdk_path
+  visual_studio_version = toolchain_data.vs_version
+  wdk_path = toolchain_data.wdk_dir
+  visual_studio_runtime_dirs = toolchain_data.runtime_dirs
+} else {
+  assert(visual_studio_version != "",
+         "You must set the visual_studio_version if you set the path")
+  assert(wdk_path != "",
+         "You must set the wdk_path if you set the visual studio path")
+  visual_studio_runtime_dirs = ""
+}
diff --git a/third_party/libwebrtc/build/config/x64.gni b/third_party/libwebrtc/build/config/x64.gni
new file mode 100644
index 0000000000..eccf417c07
--- /dev/null
+++ b/third_party/libwebrtc/build/config/x64.gni
@@ -0,0 +1,24 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# These are primarily relevant in target_cpu == "x64" contexts, where
+# X64 code is being compiled.
+if (target_cpu == "x64") {
+  declare_args() {
+    # The micro architecture of x64 cpu. This will be a string like "haswell" or
+    # "skylake". An empty string means to use the default architecture which is
+    # "x86-64".
+    # CPU options for "x86-64" in GCC can be found at
+    # https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
+    # CPU options for "x86-64" in llvm can be found at
+    # https://github.com/llvm/llvm-project/blob/master/llvm/include/llvm/Support/X86TargetParser.def
+    x64_arch = ""
+  }
+
+  if ((is_posix && !is_apple) || is_fuchsia) {
+    if (x64_arch == "") {
+      x64_arch = "x86-64"
+    }
+  }
+}
diff --git a/third_party/libwebrtc/build/config/zip.gni b/third_party/libwebrtc/build/config/zip.gni
new file mode 100644
index 0000000000..68bc49444c
--- /dev/null
+++ b/third_party/libwebrtc/build/config/zip.gni
@@ -0,0 +1,48 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("python.gni")
+
+# Creates a zip archive of the inputs.
+#
+# output (required)
+#     Path to output zip.
+# inputs (required)
+#     List of input files to zip.
+# base_dir (optional)
+#     If provided, the archive paths will be relative to this directory.
+#     Applies only to |inputs|.
+#
+# deps, public_deps, data, data_deps, testonly, visibility
+#     Normal meaning.
+template("zip") {
+  action_with_pydeps(target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "data",
+                             "data_deps",
+                             "deps",
+                             "public_deps",
+                             "testonly",
+                             "visibility",
+                           ])
+    script = "//build/android/gyp/zip.py"
+    inputs = invoker.inputs
+    outputs = [ invoker.output ]
+
+    args = [
+      "--output",
+      rebase_path(invoker.output, root_build_dir),
+    ]
+
+    _rebased_inputs = rebase_path(invoker.inputs, root_build_dir)
+    args += [ "--input-files=$_rebased_inputs" ]
+    if (defined(invoker.base_dir)) {
+      args += [
+        "--input-files-base-dir",
+        rebase_path(invoker.base_dir, root_build_dir),
+      ]
+    }
+  }
+}