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

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

22 files changed, 2818 insertions, 0 deletions

diff --git a/third_party/libwebrtc/api/units/BUILD.gn b/third_party/libwebrtc/api/units/BUILD.gn
new file mode 100644
index 0000000000..45cdcd3097
--- /dev/null
+++ b/third_party/libwebrtc/api/units/BUILD.gn
@@ -0,0 +1,111 @@
+# Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+import("../../webrtc.gni")
+
+rtc_library("data_rate") {
+  visibility = [ "*" ]
+  sources = [
+    "data_rate.cc",
+    "data_rate.h",
+  ]
+
+  deps = [
+    ":data_size",
+    ":frequency",
+    ":time_delta",
+    "..:array_view",
+    "../../rtc_base:checks",
+    "../../rtc_base:stringutils",
+    "../../rtc_base/units:unit_base",
+  ]
+}
+
+rtc_library("data_size") {
+  visibility = [ "*" ]
+  sources = [
+    "data_size.cc",
+    "data_size.h",
+  ]
+
+  deps = [
+    "..:array_view",
+    "../../rtc_base:checks",
+    "../../rtc_base:stringutils",
+    "../../rtc_base/units:unit_base",
+  ]
+}
+
+rtc_library("time_delta") {
+  visibility = [ "*" ]
+  sources = [
+    "time_delta.cc",
+    "time_delta.h",
+  ]
+
+  deps = [
+    "..:array_view",
+    "../../rtc_base:checks",
+    "../../rtc_base:stringutils",
+    "../../rtc_base/units:unit_base",
+  ]
+}
+
+rtc_library("frequency") {
+  visibility = [ "*" ]
+  sources = [
+    "frequency.cc",
+    "frequency.h",
+  ]
+
+  deps = [
+    ":time_delta",
+    "..:array_view",
+    "../../rtc_base:checks",
+    "../../rtc_base:stringutils",
+    "../../rtc_base/units:unit_base",
+  ]
+}
+
+rtc_library("timestamp") {
+  visibility = [ "*" ]
+  sources = [
+    "timestamp.cc",
+    "timestamp.h",
+  ]
+
+  deps = [
+    ":time_delta",
+    "..:array_view",
+    "../../rtc_base:checks",
+    "../../rtc_base:stringutils",
+    "../../rtc_base/units:unit_base",
+  ]
+}
+
+if (rtc_include_tests) {
+  rtc_library("units_unittests") {
+    testonly = true
+    sources = [
+      "data_rate_unittest.cc",
+      "data_size_unittest.cc",
+      "frequency_unittest.cc",
+      "time_delta_unittest.cc",
+      "timestamp_unittest.cc",
+    ]
+    deps = [
+      ":data_rate",
+      ":data_size",
+      ":frequency",
+      ":time_delta",
+      ":timestamp",
+      "../../rtc_base:logging",
+      "../../test:test_support",
+    ]
+  }
+}
diff --git a/third_party/libwebrtc/api/units/OWNERS b/third_party/libwebrtc/api/units/OWNERS
new file mode 100644
index 0000000000..53e076b20b
--- /dev/null
+++ b/third_party/libwebrtc/api/units/OWNERS
@@ -0,0 +1 @@
+srte@webrtc.org
diff --git a/third_party/libwebrtc/api/units/data_rate.cc b/third_party/libwebrtc/api/units/data_rate.cc
new file mode 100644
index 0000000000..f9586c5f40
--- /dev/null
+++ b/third_party/libwebrtc/api/units/data_rate.cc
@@ -0,0 +1,34 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/units/data_rate.h"
+
+#include "api/array_view.h"
+#include "rtc_base/strings/string_builder.h"
+
+namespace webrtc {
+
+std::string ToString(DataRate value) {
+  char buf[64];
+  rtc::SimpleStringBuilder sb(buf);
+  if (value.IsPlusInfinity()) {
+    sb << "+inf bps";
+  } else if (value.IsMinusInfinity()) {
+    sb << "-inf bps";
+  } else {
+    if (value.bps() == 0 || value.bps() % 1000 != 0) {
+      sb << value.bps() << " bps";
+    } else {
+      sb << value.kbps() << " kbps";
+    }
+  }
+  return sb.str();
+}
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/units/data_rate.h b/third_party/libwebrtc/api/units/data_rate.h
new file mode 100644
index 0000000000..d813c61156
--- /dev/null
+++ b/third_party/libwebrtc/api/units/data_rate.h
@@ -0,0 +1,155 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef API_UNITS_DATA_RATE_H_
+#define API_UNITS_DATA_RATE_H_
+
+#ifdef WEBRTC_UNIT_TEST
+#include <ostream>  // no-presubmit-check TODO(webrtc:8982)
+#endif              // WEBRTC_UNIT_TEST
+
+#include <limits>
+#include <string>
+#include <type_traits>
+
+#include "api/units/data_size.h"
+#include "api/units/frequency.h"
+#include "api/units/time_delta.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/units/unit_base.h"  // IWYU pragma: export
+
+namespace webrtc {
+// DataRate is a class that represents a given data rate. This can be used to
+// represent bandwidth, encoding bitrate, etc. The internal storage is bits per
+// second (bps).
+class DataRate final : public rtc_units_impl::RelativeUnit<DataRate> {
+ public:
+  template <typename T>
+  static constexpr DataRate BitsPerSec(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromValue(value);
+  }
+  template <typename T>
+  static constexpr DataRate BytesPerSec(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromFraction(8, value);
+  }
+  template <typename T>
+  static constexpr DataRate KilobitsPerSec(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromFraction(1000, value);
+  }
+  static constexpr DataRate Infinity() { return PlusInfinity(); }
+
+  DataRate() = delete;
+
+  template <typename T = int64_t>
+  constexpr T bps() const {
+    return ToValue<T>();
+  }
+  template <typename T = int64_t>
+  constexpr T bytes_per_sec() const {
+    return ToFraction<8, T>();
+  }
+  template <typename T = int64_t>
+  constexpr T kbps() const {
+    return ToFraction<1000, T>();
+  }
+  constexpr int64_t bps_or(int64_t fallback_value) const {
+    return ToValueOr(fallback_value);
+  }
+  constexpr int64_t kbps_or(int64_t fallback_value) const {
+    return ToFractionOr<1000>(fallback_value);
+  }
+
+ private:
+  // Bits per second used internally to simplify debugging by making the value
+  // more recognizable.
+  friend class rtc_units_impl::UnitBase<DataRate>;
+  using RelativeUnit::RelativeUnit;
+  static constexpr bool one_sided = true;
+};
+
+namespace data_rate_impl {
+inline constexpr int64_t Microbits(const DataSize& size) {
+  constexpr int64_t kMaxBeforeConversion =
+      std::numeric_limits<int64_t>::max() / 8000000;
+  RTC_DCHECK_LE(size.bytes(), kMaxBeforeConversion)
+      << "size is too large to be expressed in microbits";
+  return size.bytes() * 8000000;
+}
+
+inline constexpr int64_t MillibytePerSec(const DataRate& size) {
+  constexpr int64_t kMaxBeforeConversion =
+      std::numeric_limits<int64_t>::max() / (1000 / 8);
+  RTC_DCHECK_LE(size.bps(), kMaxBeforeConversion)
+      << "rate is too large to be expressed in microbytes per second";
+  return size.bps() * (1000 / 8);
+}
+}  // namespace data_rate_impl
+
+inline constexpr DataRate operator/(const DataSize size,
+                                    const TimeDelta duration) {
+  return DataRate::BitsPerSec(data_rate_impl::Microbits(size) / duration.us());
+}
+inline constexpr TimeDelta operator/(const DataSize size, const DataRate rate) {
+  return TimeDelta::Micros(data_rate_impl::Microbits(size) / rate.bps());
+}
+inline constexpr DataSize operator*(const DataRate rate,
+                                    const TimeDelta duration) {
+  int64_t microbits = rate.bps() * duration.us();
+  return DataSize::Bytes((microbits + 4000000) / 8000000);
+}
+inline constexpr DataSize operator*(const TimeDelta duration,
+                                    const DataRate rate) {
+  return rate * duration;
+}
+
+inline constexpr DataSize operator/(const DataRate rate,
+                                    const Frequency frequency) {
+  int64_t millihertz = frequency.millihertz<int64_t>();
+  // Note that the value is truncated here reather than rounded, potentially
+  // introducing an error of .5 bytes if rounding were expected.
+  return DataSize::Bytes(data_rate_impl::MillibytePerSec(rate) / millihertz);
+}
+inline constexpr Frequency operator/(const DataRate rate, const DataSize size) {
+  return Frequency::MilliHertz(data_rate_impl::MillibytePerSec(rate) /
+                               size.bytes());
+}
+inline constexpr DataRate operator*(const DataSize size,
+                                    const Frequency frequency) {
+  RTC_DCHECK(frequency.IsZero() ||
+             size.bytes() <= std::numeric_limits<int64_t>::max() / 8 /
+                                 frequency.millihertz<int64_t>());
+  int64_t millibits_per_second =
+      size.bytes() * 8 * frequency.millihertz<int64_t>();
+  return DataRate::BitsPerSec((millibits_per_second + 500) / 1000);
+}
+inline constexpr DataRate operator*(const Frequency frequency,
+                                    const DataSize size) {
+  return size * frequency;
+}
+
+std::string ToString(DataRate value);
+inline std::string ToLogString(DataRate value) {
+  return ToString(value);
+}
+
+#ifdef WEBRTC_UNIT_TEST
+inline std::ostream& operator<<(  // no-presubmit-check TODO(webrtc:8982)
+    std::ostream& stream,         // no-presubmit-check TODO(webrtc:8982)
+    DataRate value) {
+  return stream << ToString(value);
+}
+#endif  // WEBRTC_UNIT_TEST
+
+}  // namespace webrtc
+
+#endif  // API_UNITS_DATA_RATE_H_
diff --git a/third_party/libwebrtc/api/units/data_rate_gn/moz.build b/third_party/libwebrtc/api/units/data_rate_gn/moz.build
new file mode 100644
index 0000000000..de76b8e11c
--- /dev/null
+++ b/third_party/libwebrtc/api/units/data_rate_gn/moz.build
@@ -0,0 +1,221 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/api/units/data_rate.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+if CONFIG["CPU_ARCH"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["CPU_ARCH"] == "arm":
+
+    CXXFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["CPU_ARCH"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["CPU_ARCH"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["CPU_ARCH"] == "arm" and CONFIG["OS_TARGET"] == "Android":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["CPU_ARCH"] == "x86" and CONFIG["OS_TARGET"] == "Android":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["CPU_ARCH"] == "aarch64" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "arm" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86" and CONFIG["OS_TARGET"] == "Linux":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86_64" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+Library("data_rate_gn")
diff --git a/third_party/libwebrtc/api/units/data_rate_unittest.cc b/third_party/libwebrtc/api/units/data_rate_unittest.cc
new file mode 100644
index 0000000000..f77b3702d4
--- /dev/null
+++ b/third_party/libwebrtc/api/units/data_rate_unittest.cc
@@ -0,0 +1,197 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/units/data_rate.h"
+
+#include "rtc_base/logging.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace test {
+
+TEST(DataRateTest, CompilesWithChecksAndLogs) {
+  DataRate a = DataRate::KilobitsPerSec(300);
+  DataRate b = DataRate::KilobitsPerSec(210);
+  RTC_CHECK_GT(a, b);
+  RTC_LOG(LS_INFO) << a;
+}
+
+TEST(DataRateTest, ConstExpr) {
+  constexpr int64_t kValue = 12345;
+  constexpr DataRate kDataRateZero = DataRate::Zero();
+  constexpr DataRate kDataRateInf = DataRate::Infinity();
+  static_assert(kDataRateZero.IsZero(), "");
+  static_assert(kDataRateInf.IsInfinite(), "");
+  static_assert(kDataRateInf.bps_or(-1) == -1, "");
+  static_assert(kDataRateInf > kDataRateZero, "");
+
+  constexpr DataRate kDataRateBps = DataRate::BitsPerSec(kValue);
+  constexpr DataRate kDataRateKbps = DataRate::KilobitsPerSec(kValue);
+  static_assert(kDataRateBps.bps<double>() == kValue, "");
+  static_assert(kDataRateBps.bps_or(0) == kValue, "");
+  static_assert(kDataRateKbps.kbps_or(0) == kValue, "");
+}
+
+TEST(DataRateTest, GetBackSameValues) {
+  const int64_t kValue = 123 * 8;
+  EXPECT_EQ(DataRate::BitsPerSec(kValue).bps(), kValue);
+  EXPECT_EQ(DataRate::KilobitsPerSec(kValue).kbps(), kValue);
+}
+
+TEST(DataRateTest, GetDifferentPrefix) {
+  const int64_t kValue = 123 * 8000;
+  EXPECT_EQ(DataRate::BitsPerSec(kValue).kbps(), kValue / 1000);
+}
+
+TEST(DataRateTest, IdentityChecks) {
+  const int64_t kValue = 3000;
+  EXPECT_TRUE(DataRate::Zero().IsZero());
+  EXPECT_FALSE(DataRate::BitsPerSec(kValue).IsZero());
+
+  EXPECT_TRUE(DataRate::Infinity().IsInfinite());
+  EXPECT_FALSE(DataRate::Zero().IsInfinite());
+  EXPECT_FALSE(DataRate::BitsPerSec(kValue).IsInfinite());
+
+  EXPECT_FALSE(DataRate::Infinity().IsFinite());
+  EXPECT_TRUE(DataRate::BitsPerSec(kValue).IsFinite());
+  EXPECT_TRUE(DataRate::Zero().IsFinite());
+}
+
+TEST(DataRateTest, ComparisonOperators) {
+  const int64_t kSmall = 450;
+  const int64_t kLarge = 451;
+  const DataRate small = DataRate::BitsPerSec(kSmall);
+  const DataRate large = DataRate::BitsPerSec(kLarge);
+
+  EXPECT_EQ(DataRate::Zero(), DataRate::BitsPerSec(0));
+  EXPECT_EQ(DataRate::Infinity(), DataRate::Infinity());
+  EXPECT_EQ(small, small);
+  EXPECT_LE(small, small);
+  EXPECT_GE(small, small);
+  EXPECT_NE(small, large);
+  EXPECT_LE(small, large);
+  EXPECT_LT(small, large);
+  EXPECT_GE(large, small);
+  EXPECT_GT(large, small);
+  EXPECT_LT(DataRate::Zero(), small);
+  EXPECT_GT(DataRate::Infinity(), large);
+}
+
+TEST(DataRateTest, ConvertsToAndFromDouble) {
+  const int64_t kValue = 128;
+  const double kDoubleValue = static_cast<double>(kValue);
+  const double kDoubleKbps = kValue * 1e-3;
+  const double kFloatKbps = static_cast<float>(kDoubleKbps);
+
+  EXPECT_EQ(DataRate::BitsPerSec(kValue).bps<double>(), kDoubleValue);
+  EXPECT_EQ(DataRate::BitsPerSec(kValue).kbps<double>(), kDoubleKbps);
+  EXPECT_EQ(DataRate::BitsPerSec(kValue).kbps<float>(), kFloatKbps);
+  EXPECT_EQ(DataRate::BitsPerSec(kDoubleValue).bps(), kValue);
+  EXPECT_EQ(DataRate::KilobitsPerSec(kDoubleKbps).bps(), kValue);
+
+  const double kInfinity = std::numeric_limits<double>::infinity();
+  EXPECT_EQ(DataRate::Infinity().bps<double>(), kInfinity);
+  EXPECT_TRUE(DataRate::BitsPerSec(kInfinity).IsInfinite());
+  EXPECT_TRUE(DataRate::KilobitsPerSec(kInfinity).IsInfinite());
+}
+TEST(DataRateTest, Clamping) {
+  const DataRate upper = DataRate::KilobitsPerSec(800);
+  const DataRate lower = DataRate::KilobitsPerSec(100);
+  const DataRate under = DataRate::KilobitsPerSec(100);
+  const DataRate inside = DataRate::KilobitsPerSec(500);
+  const DataRate over = DataRate::KilobitsPerSec(1000);
+  EXPECT_EQ(under.Clamped(lower, upper), lower);
+  EXPECT_EQ(inside.Clamped(lower, upper), inside);
+  EXPECT_EQ(over.Clamped(lower, upper), upper);
+
+  DataRate mutable_rate = lower;
+  mutable_rate.Clamp(lower, upper);
+  EXPECT_EQ(mutable_rate, lower);
+  mutable_rate = inside;
+  mutable_rate.Clamp(lower, upper);
+  EXPECT_EQ(mutable_rate, inside);
+  mutable_rate = over;
+  mutable_rate.Clamp(lower, upper);
+  EXPECT_EQ(mutable_rate, upper);
+}
+
+TEST(DataRateTest, MathOperations) {
+  const int64_t kValueA = 450;
+  const int64_t kValueB = 267;
+  const DataRate rate_a = DataRate::BitsPerSec(kValueA);
+  const DataRate rate_b = DataRate::BitsPerSec(kValueB);
+  const int32_t kInt32Value = 123;
+  const double kFloatValue = 123.0;
+
+  EXPECT_EQ((rate_a + rate_b).bps(), kValueA + kValueB);
+  EXPECT_EQ((rate_a - rate_b).bps(), kValueA - kValueB);
+
+  EXPECT_EQ((rate_a * kValueB).bps(), kValueA * kValueB);
+  EXPECT_EQ((rate_a * kInt32Value).bps(), kValueA * kInt32Value);
+  EXPECT_EQ((rate_a * kFloatValue).bps(), kValueA * kFloatValue);
+
+  EXPECT_EQ(rate_a / rate_b, static_cast<double>(kValueA) / kValueB);
+
+  EXPECT_EQ((rate_a / 10).bps(), kValueA / 10);
+  EXPECT_NEAR((rate_a / 0.5).bps(), kValueA * 2, 1);
+
+  DataRate mutable_rate = DataRate::BitsPerSec(kValueA);
+  mutable_rate += rate_b;
+  EXPECT_EQ(mutable_rate.bps(), kValueA + kValueB);
+  mutable_rate -= rate_a;
+  EXPECT_EQ(mutable_rate.bps(), kValueB);
+}
+
+TEST(UnitConversionTest, DataRateAndDataSizeAndTimeDelta) {
+  const int64_t kSeconds = 5;
+  const int64_t kBitsPerSecond = 440;
+  const int64_t kBytes = 44000;
+  const TimeDelta delta_a = TimeDelta::Seconds(kSeconds);
+  const DataRate rate_b = DataRate::BitsPerSec(kBitsPerSecond);
+  const DataSize size_c = DataSize::Bytes(kBytes);
+  EXPECT_EQ((delta_a * rate_b).bytes(), kSeconds * kBitsPerSecond / 8);
+  EXPECT_EQ((rate_b * delta_a).bytes(), kSeconds * kBitsPerSecond / 8);
+  EXPECT_EQ((size_c / delta_a).bps(), kBytes * 8 / kSeconds);
+  EXPECT_EQ((size_c / rate_b).seconds(), kBytes * 8 / kBitsPerSecond);
+}
+
+TEST(UnitConversionTest, DataRateAndDataSizeAndFrequency) {
+  const int64_t kHertz = 30;
+  const int64_t kBitsPerSecond = 96000;
+  const int64_t kBytes = 1200;
+  const Frequency freq_a = Frequency::Hertz(kHertz);
+  const DataRate rate_b = DataRate::BitsPerSec(kBitsPerSecond);
+  const DataSize size_c = DataSize::Bytes(kBytes);
+  EXPECT_EQ((freq_a * size_c).bps(), kHertz * kBytes * 8);
+  EXPECT_EQ((size_c * freq_a).bps(), kHertz * kBytes * 8);
+  EXPECT_EQ((rate_b / size_c).hertz<int64_t>(), kBitsPerSecond / kBytes / 8);
+  EXPECT_EQ((rate_b / freq_a).bytes(), kBitsPerSecond / kHertz / 8);
+}
+
+TEST(UnitConversionDeathTest, DivisionFailsOnLargeSize) {
+  // Note that the failure is expected since the current implementation  is
+  // implementated in a way that does not support division of large sizes. If
+  // the implementation is changed, this test can safely be removed.
+  const int64_t kJustSmallEnoughForDivision =
+      std::numeric_limits<int64_t>::max() / 8000000;
+  const DataSize large_size = DataSize::Bytes(kJustSmallEnoughForDivision);
+  const DataRate data_rate = DataRate::KilobitsPerSec(100);
+  const TimeDelta time_delta = TimeDelta::Millis(100);
+  EXPECT_TRUE((large_size / data_rate).IsFinite());
+  EXPECT_TRUE((large_size / time_delta).IsFinite());
+#if GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID) && RTC_DCHECK_IS_ON
+  const int64_t kToolargeForDivision = kJustSmallEnoughForDivision + 1;
+  const DataSize too_large_size = DataSize::Bytes(kToolargeForDivision);
+  EXPECT_DEATH(too_large_size / data_rate, "");
+  EXPECT_DEATH(too_large_size / time_delta, "");
+#endif  // GTEST_HAS_DEATH_TEST && !!defined(WEBRTC_ANDROID) && RTC_DCHECK_IS_ON
+}
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/units/data_size.cc b/third_party/libwebrtc/api/units/data_size.cc
new file mode 100644
index 0000000000..45487dfd83
--- /dev/null
+++ b/third_party/libwebrtc/api/units/data_size.cc
@@ -0,0 +1,30 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/units/data_size.h"
+
+#include "api/array_view.h"
+#include "rtc_base/strings/string_builder.h"
+
+namespace webrtc {
+
+std::string ToString(DataSize value) {
+  char buf[64];
+  rtc::SimpleStringBuilder sb(buf);
+  if (value.IsPlusInfinity()) {
+    sb << "+inf bytes";
+  } else if (value.IsMinusInfinity()) {
+    sb << "-inf bytes";
+  } else {
+    sb << value.bytes() << " bytes";
+  }
+  return sb.str();
+}
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/units/data_size.h b/third_party/libwebrtc/api/units/data_size.h
new file mode 100644
index 0000000000..9df6434fb9
--- /dev/null
+++ b/third_party/libwebrtc/api/units/data_size.h
@@ -0,0 +1,66 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef API_UNITS_DATA_SIZE_H_
+#define API_UNITS_DATA_SIZE_H_
+
+#ifdef WEBRTC_UNIT_TEST
+#include <ostream>  // no-presubmit-check TODO(webrtc:8982)
+#endif              // WEBRTC_UNIT_TEST
+
+#include <string>
+#include <type_traits>
+
+#include "rtc_base/units/unit_base.h"  // IWYU pragma: export
+
+namespace webrtc {
+// DataSize is a class represeting a count of bytes.
+class DataSize final : public rtc_units_impl::RelativeUnit<DataSize> {
+ public:
+  template <typename T>
+  static constexpr DataSize Bytes(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromValue(value);
+  }
+  static constexpr DataSize Infinity() { return PlusInfinity(); }
+
+  DataSize() = delete;
+
+  template <typename T = int64_t>
+  constexpr T bytes() const {
+    return ToValue<T>();
+  }
+
+  constexpr int64_t bytes_or(int64_t fallback_value) const {
+    return ToValueOr(fallback_value);
+  }
+
+ private:
+  friend class rtc_units_impl::UnitBase<DataSize>;
+  using RelativeUnit::RelativeUnit;
+  static constexpr bool one_sided = true;
+};
+
+std::string ToString(DataSize value);
+inline std::string ToLogString(DataSize value) {
+  return ToString(value);
+}
+
+#ifdef WEBRTC_UNIT_TEST
+inline std::ostream& operator<<(  // no-presubmit-check TODO(webrtc:8982)
+    std::ostream& stream,         // no-presubmit-check TODO(webrtc:8982)
+    DataSize value) {
+  return stream << ToString(value);
+}
+#endif  // WEBRTC_UNIT_TEST
+
+}  // namespace webrtc
+
+#endif  // API_UNITS_DATA_SIZE_H_
diff --git a/third_party/libwebrtc/api/units/data_size_gn/moz.build b/third_party/libwebrtc/api/units/data_size_gn/moz.build
new file mode 100644
index 0000000000..dc54ce4f15
--- /dev/null
+++ b/third_party/libwebrtc/api/units/data_size_gn/moz.build
@@ -0,0 +1,221 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/api/units/data_size.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+if CONFIG["CPU_ARCH"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["CPU_ARCH"] == "arm":
+
+    CXXFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["CPU_ARCH"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["CPU_ARCH"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["CPU_ARCH"] == "arm" and CONFIG["OS_TARGET"] == "Android":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["CPU_ARCH"] == "x86" and CONFIG["OS_TARGET"] == "Android":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["CPU_ARCH"] == "aarch64" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "arm" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86" and CONFIG["OS_TARGET"] == "Linux":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86_64" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+Library("data_size_gn")
diff --git a/third_party/libwebrtc/api/units/data_size_unittest.cc b/third_party/libwebrtc/api/units/data_size_unittest.cc
new file mode 100644
index 0000000000..eb8d98c1f0
--- /dev/null
+++ b/third_party/libwebrtc/api/units/data_size_unittest.cc
@@ -0,0 +1,110 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/units/data_size.h"
+
+#include <limits>
+
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace test {
+
+TEST(DataSizeTest, ConstExpr) {
+  constexpr int64_t kValue = 12345;
+  constexpr DataSize kDataSizeZero = DataSize::Zero();
+  constexpr DataSize kDataSizeInf = DataSize::Infinity();
+  static_assert(kDataSizeZero.IsZero(), "");
+  static_assert(kDataSizeInf.IsInfinite(), "");
+  static_assert(kDataSizeInf.bytes_or(-1) == -1, "");
+  static_assert(kDataSizeInf > kDataSizeZero, "");
+
+  constexpr DataSize kDataSize = DataSize::Bytes(kValue);
+  static_assert(kDataSize.bytes_or(-1) == kValue, "");
+
+  EXPECT_EQ(kDataSize.bytes(), kValue);
+}
+
+TEST(DataSizeTest, GetBackSameValues) {
+  const int64_t kValue = 123 * 8;
+  EXPECT_EQ(DataSize::Bytes(kValue).bytes(), kValue);
+}
+
+TEST(DataSizeTest, IdentityChecks) {
+  const int64_t kValue = 3000;
+  EXPECT_TRUE(DataSize::Zero().IsZero());
+  EXPECT_FALSE(DataSize::Bytes(kValue).IsZero());
+
+  EXPECT_TRUE(DataSize::Infinity().IsInfinite());
+  EXPECT_FALSE(DataSize::Zero().IsInfinite());
+  EXPECT_FALSE(DataSize::Bytes(kValue).IsInfinite());
+
+  EXPECT_FALSE(DataSize::Infinity().IsFinite());
+  EXPECT_TRUE(DataSize::Bytes(kValue).IsFinite());
+  EXPECT_TRUE(DataSize::Zero().IsFinite());
+}
+
+TEST(DataSizeTest, ComparisonOperators) {
+  const int64_t kSmall = 450;
+  const int64_t kLarge = 451;
+  const DataSize small = DataSize::Bytes(kSmall);
+  const DataSize large = DataSize::Bytes(kLarge);
+
+  EXPECT_EQ(DataSize::Zero(), DataSize::Bytes(0));
+  EXPECT_EQ(DataSize::Infinity(), DataSize::Infinity());
+  EXPECT_EQ(small, small);
+  EXPECT_LE(small, small);
+  EXPECT_GE(small, small);
+  EXPECT_NE(small, large);
+  EXPECT_LE(small, large);
+  EXPECT_LT(small, large);
+  EXPECT_GE(large, small);
+  EXPECT_GT(large, small);
+  EXPECT_LT(DataSize::Zero(), small);
+  EXPECT_GT(DataSize::Infinity(), large);
+}
+
+TEST(DataSizeTest, ConvertsToAndFromDouble) {
+  const int64_t kValue = 128;
+  const double kDoubleValue = static_cast<double>(kValue);
+
+  EXPECT_EQ(DataSize::Bytes(kValue).bytes<double>(), kDoubleValue);
+  EXPECT_EQ(DataSize::Bytes(kDoubleValue).bytes(), kValue);
+
+  const double kInfinity = std::numeric_limits<double>::infinity();
+  EXPECT_EQ(DataSize::Infinity().bytes<double>(), kInfinity);
+  EXPECT_TRUE(DataSize::Bytes(kInfinity).IsInfinite());
+}
+
+TEST(DataSizeTest, MathOperations) {
+  const int64_t kValueA = 450;
+  const int64_t kValueB = 267;
+  const DataSize size_a = DataSize::Bytes(kValueA);
+  const DataSize size_b = DataSize::Bytes(kValueB);
+  EXPECT_EQ((size_a + size_b).bytes(), kValueA + kValueB);
+  EXPECT_EQ((size_a - size_b).bytes(), kValueA - kValueB);
+
+  const int32_t kInt32Value = 123;
+  const double kFloatValue = 123.0;
+  EXPECT_EQ((size_a * kValueB).bytes(), kValueA * kValueB);
+  EXPECT_EQ((size_a * kInt32Value).bytes(), kValueA * kInt32Value);
+  EXPECT_EQ((size_a * kFloatValue).bytes(), kValueA * kFloatValue);
+
+  EXPECT_EQ((size_a / 10).bytes(), kValueA / 10);
+  EXPECT_EQ(size_a / size_b, static_cast<double>(kValueA) / kValueB);
+
+  DataSize mutable_size = DataSize::Bytes(kValueA);
+  mutable_size += size_b;
+  EXPECT_EQ(mutable_size.bytes(), kValueA + kValueB);
+  mutable_size -= size_a;
+  EXPECT_EQ(mutable_size.bytes(), kValueB);
+}
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/units/frequency.cc b/third_party/libwebrtc/api/units/frequency.cc
new file mode 100644
index 0000000000..2d938a2814
--- /dev/null
+++ b/third_party/libwebrtc/api/units/frequency.cc
@@ -0,0 +1,29 @@
+/*
+ *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include "api/units/frequency.h"
+
+#include "rtc_base/strings/string_builder.h"
+
+namespace webrtc {
+std::string ToString(Frequency value) {
+  char buf[64];
+  rtc::SimpleStringBuilder sb(buf);
+  if (value.IsPlusInfinity()) {
+    sb << "+inf Hz";
+  } else if (value.IsMinusInfinity()) {
+    sb << "-inf Hz";
+  } else if (value.millihertz<int64_t>() % 1000 != 0) {
+    sb.AppendFormat("%.3f Hz", value.hertz<double>());
+  } else {
+    sb << value.hertz<int64_t>() << " Hz";
+  }
+  return sb.str();
+}
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/units/frequency.h b/third_party/libwebrtc/api/units/frequency.h
new file mode 100644
index 0000000000..06081e4c0d
--- /dev/null
+++ b/third_party/libwebrtc/api/units/frequency.h
@@ -0,0 +1,101 @@
+/*
+ *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#ifndef API_UNITS_FREQUENCY_H_
+#define API_UNITS_FREQUENCY_H_
+
+#ifdef WEBRTC_UNIT_TEST
+#include <ostream>  // no-presubmit-check TODO(webrtc:8982)
+#endif              // WEBRTC_UNIT_TEST
+
+#include <cstdlib>
+#include <limits>
+#include <string>
+#include <type_traits>
+
+#include "api/units/time_delta.h"
+#include "rtc_base/units/unit_base.h"  // IWYU pragma: export
+
+namespace webrtc {
+
+class Frequency final : public rtc_units_impl::RelativeUnit<Frequency> {
+ public:
+  template <typename T>
+  static constexpr Frequency MilliHertz(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromValue(value);
+  }
+  template <typename T>
+  static constexpr Frequency Hertz(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromFraction(1'000, value);
+  }
+  template <typename T>
+  static constexpr Frequency KiloHertz(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromFraction(1'000'000, value);
+  }
+
+  Frequency() = delete;
+
+  template <typename T = int64_t>
+  constexpr T hertz() const {
+    return ToFraction<1000, T>();
+  }
+  template <typename T = int64_t>
+  constexpr T millihertz() const {
+    return ToValue<T>();
+  }
+
+ private:
+  friend class rtc_units_impl::UnitBase<Frequency>;
+  using RelativeUnit::RelativeUnit;
+  static constexpr bool one_sided = true;
+};
+
+inline constexpr Frequency operator/(int64_t nominator,
+                                     const TimeDelta& interval) {
+  constexpr int64_t kKiloPerMicro = 1000 * 1000000;
+  RTC_DCHECK_LE(nominator, std::numeric_limits<int64_t>::max() / kKiloPerMicro);
+  RTC_CHECK(interval.IsFinite());
+  RTC_CHECK(!interval.IsZero());
+  return Frequency::MilliHertz(nominator * kKiloPerMicro / interval.us());
+}
+
+inline constexpr TimeDelta operator/(int64_t nominator,
+                                     const Frequency& frequency) {
+  constexpr int64_t kMegaPerMilli = 1000000 * 1000;
+  RTC_DCHECK_LE(nominator, std::numeric_limits<int64_t>::max() / kMegaPerMilli);
+  RTC_CHECK(frequency.IsFinite());
+  RTC_CHECK(!frequency.IsZero());
+  return TimeDelta::Micros(nominator * kMegaPerMilli / frequency.millihertz());
+}
+
+inline constexpr double operator*(Frequency frequency, TimeDelta time_delta) {
+  return frequency.hertz<double>() * time_delta.seconds<double>();
+}
+inline constexpr double operator*(TimeDelta time_delta, Frequency frequency) {
+  return frequency * time_delta;
+}
+
+std::string ToString(Frequency value);
+inline std::string ToLogString(Frequency value) {
+  return ToString(value);
+}
+
+#ifdef WEBRTC_UNIT_TEST
+inline std::ostream& operator<<(  // no-presubmit-check TODO(webrtc:8982)
+    std::ostream& stream,         // no-presubmit-check TODO(webrtc:8982)
+    Frequency value) {
+  return stream << ToString(value);
+}
+#endif  // WEBRTC_UNIT_TEST
+
+}  // namespace webrtc
+#endif  // API_UNITS_FREQUENCY_H_
diff --git a/third_party/libwebrtc/api/units/frequency_gn/moz.build b/third_party/libwebrtc/api/units/frequency_gn/moz.build
new file mode 100644
index 0000000000..3c84c283b8
--- /dev/null
+++ b/third_party/libwebrtc/api/units/frequency_gn/moz.build
@@ -0,0 +1,221 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/api/units/frequency.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+if CONFIG["CPU_ARCH"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["CPU_ARCH"] == "arm":
+
+    CXXFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["CPU_ARCH"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["CPU_ARCH"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["CPU_ARCH"] == "arm" and CONFIG["OS_TARGET"] == "Android":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["CPU_ARCH"] == "x86" and CONFIG["OS_TARGET"] == "Android":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["CPU_ARCH"] == "aarch64" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "arm" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86" and CONFIG["OS_TARGET"] == "Linux":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86_64" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+Library("frequency_gn")
diff --git a/third_party/libwebrtc/api/units/frequency_unittest.cc b/third_party/libwebrtc/api/units/frequency_unittest.cc
new file mode 100644
index 0000000000..1260c2107d
--- /dev/null
+++ b/third_party/libwebrtc/api/units/frequency_unittest.cc
@@ -0,0 +1,161 @@
+/*
+ *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include "api/units/frequency.h"
+
+#include <limits>
+
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace test {
+TEST(FrequencyTest, ConstExpr) {
+  constexpr Frequency kFrequencyZero = Frequency::Zero();
+  constexpr Frequency kFrequencyPlusInf = Frequency::PlusInfinity();
+  constexpr Frequency kFrequencyMinusInf = Frequency::MinusInfinity();
+  static_assert(kFrequencyZero.IsZero(), "");
+  static_assert(kFrequencyPlusInf.IsPlusInfinity(), "");
+  static_assert(kFrequencyMinusInf.IsMinusInfinity(), "");
+
+  static_assert(kFrequencyPlusInf > kFrequencyZero, "");
+}
+
+TEST(FrequencyTest, GetBackSameValues) {
+  const int64_t kValue = 31;
+  EXPECT_EQ(Frequency::Hertz(kValue).hertz<int64_t>(), kValue);
+  EXPECT_EQ(Frequency::Zero().hertz<int64_t>(), 0);
+}
+
+TEST(FrequencyTest, GetDifferentPrefix) {
+  const int64_t kValue = 30000;
+  EXPECT_EQ(Frequency::MilliHertz(kValue).hertz<int64_t>(), kValue / 1000);
+  EXPECT_EQ(Frequency::Hertz(kValue).millihertz(), kValue * 1000);
+  EXPECT_EQ(Frequency::KiloHertz(kValue).hertz(), kValue * 1000);
+}
+
+TEST(FrequencyTest, IdentityChecks) {
+  const int64_t kValue = 31;
+  EXPECT_TRUE(Frequency::Zero().IsZero());
+  EXPECT_FALSE(Frequency::Hertz(kValue).IsZero());
+
+  EXPECT_TRUE(Frequency::PlusInfinity().IsInfinite());
+  EXPECT_TRUE(Frequency::MinusInfinity().IsInfinite());
+  EXPECT_FALSE(Frequency::Zero().IsInfinite());
+  EXPECT_FALSE(Frequency::Hertz(kValue).IsInfinite());
+
+  EXPECT_FALSE(Frequency::PlusInfinity().IsFinite());
+  EXPECT_FALSE(Frequency::MinusInfinity().IsFinite());
+  EXPECT_TRUE(Frequency::Hertz(kValue).IsFinite());
+  EXPECT_TRUE(Frequency::Zero().IsFinite());
+
+  EXPECT_TRUE(Frequency::PlusInfinity().IsPlusInfinity());
+  EXPECT_FALSE(Frequency::MinusInfinity().IsPlusInfinity());
+
+  EXPECT_TRUE(Frequency::MinusInfinity().IsMinusInfinity());
+  EXPECT_FALSE(Frequency::PlusInfinity().IsMinusInfinity());
+}
+
+TEST(FrequencyTest, ComparisonOperators) {
+  const int64_t kSmall = 42;
+  const int64_t kLarge = 45;
+  const Frequency small = Frequency::Hertz(kSmall);
+  const Frequency large = Frequency::Hertz(kLarge);
+
+  EXPECT_EQ(Frequency::Zero(), Frequency::Hertz(0));
+  EXPECT_EQ(Frequency::PlusInfinity(), Frequency::PlusInfinity());
+  EXPECT_EQ(small, Frequency::Hertz(kSmall));
+  EXPECT_LE(small, Frequency::Hertz(kSmall));
+  EXPECT_GE(small, Frequency::Hertz(kSmall));
+  EXPECT_NE(small, Frequency::Hertz(kLarge));
+  EXPECT_LE(small, Frequency::Hertz(kLarge));
+  EXPECT_LT(small, Frequency::Hertz(kLarge));
+  EXPECT_GE(large, Frequency::Hertz(kSmall));
+  EXPECT_GT(large, Frequency::Hertz(kSmall));
+  EXPECT_LT(Frequency::Zero(), small);
+
+  EXPECT_GT(Frequency::PlusInfinity(), large);
+  EXPECT_LT(Frequency::MinusInfinity(), Frequency::Zero());
+}
+
+TEST(FrequencyTest, Clamping) {
+  const Frequency upper = Frequency::Hertz(800);
+  const Frequency lower = Frequency::Hertz(100);
+  const Frequency under = Frequency::Hertz(100);
+  const Frequency inside = Frequency::Hertz(500);
+  const Frequency over = Frequency::Hertz(1000);
+  EXPECT_EQ(under.Clamped(lower, upper), lower);
+  EXPECT_EQ(inside.Clamped(lower, upper), inside);
+  EXPECT_EQ(over.Clamped(lower, upper), upper);
+
+  Frequency mutable_frequency = lower;
+  mutable_frequency.Clamp(lower, upper);
+  EXPECT_EQ(mutable_frequency, lower);
+  mutable_frequency = inside;
+  mutable_frequency.Clamp(lower, upper);
+  EXPECT_EQ(mutable_frequency, inside);
+  mutable_frequency = over;
+  mutable_frequency.Clamp(lower, upper);
+  EXPECT_EQ(mutable_frequency, upper);
+}
+
+TEST(FrequencyTest, MathOperations) {
+  const int64_t kValueA = 457;
+  const int64_t kValueB = 260;
+  const Frequency frequency_a = Frequency::Hertz(kValueA);
+  const Frequency frequency_b = Frequency::Hertz(kValueB);
+  EXPECT_EQ((frequency_a + frequency_b).hertz<int64_t>(), kValueA + kValueB);
+  EXPECT_EQ((frequency_a - frequency_b).hertz<int64_t>(), kValueA - kValueB);
+
+  EXPECT_EQ((Frequency::Hertz(kValueA) * kValueB).hertz<int64_t>(),
+            kValueA * kValueB);
+
+  EXPECT_EQ((frequency_b / 10).hertz<int64_t>(), kValueB / 10);
+  EXPECT_EQ(frequency_b / frequency_a, static_cast<double>(kValueB) / kValueA);
+
+  Frequency mutable_frequency = Frequency::Hertz(kValueA);
+  mutable_frequency += Frequency::Hertz(kValueB);
+  EXPECT_EQ(mutable_frequency, Frequency::Hertz(kValueA + kValueB));
+  mutable_frequency -= Frequency::Hertz(kValueB);
+  EXPECT_EQ(mutable_frequency, Frequency::Hertz(kValueA));
+}
+TEST(FrequencyTest, Rounding) {
+  const Frequency freq_high = Frequency::Hertz(23.976);
+  EXPECT_EQ(freq_high.hertz(), 24);
+  EXPECT_EQ(freq_high.RoundDownTo(Frequency::Hertz(1)), Frequency::Hertz(23));
+  EXPECT_EQ(freq_high.RoundTo(Frequency::Hertz(1)), Frequency::Hertz(24));
+  EXPECT_EQ(freq_high.RoundUpTo(Frequency::Hertz(1)), Frequency::Hertz(24));
+
+  const Frequency freq_low = Frequency::Hertz(23.4);
+  EXPECT_EQ(freq_low.hertz(), 23);
+  EXPECT_EQ(freq_low.RoundDownTo(Frequency::Hertz(1)), Frequency::Hertz(23));
+  EXPECT_EQ(freq_low.RoundTo(Frequency::Hertz(1)), Frequency::Hertz(23));
+  EXPECT_EQ(freq_low.RoundUpTo(Frequency::Hertz(1)), Frequency::Hertz(24));
+}
+
+TEST(FrequencyTest, InfinityOperations) {
+  const double kValue = 267;
+  const Frequency finite = Frequency::Hertz(kValue);
+  EXPECT_TRUE((Frequency::PlusInfinity() + finite).IsPlusInfinity());
+  EXPECT_TRUE((Frequency::PlusInfinity() - finite).IsPlusInfinity());
+  EXPECT_TRUE((finite + Frequency::PlusInfinity()).IsPlusInfinity());
+  EXPECT_TRUE((finite - Frequency::MinusInfinity()).IsPlusInfinity());
+
+  EXPECT_TRUE((Frequency::MinusInfinity() + finite).IsMinusInfinity());
+  EXPECT_TRUE((Frequency::MinusInfinity() - finite).IsMinusInfinity());
+  EXPECT_TRUE((finite + Frequency::MinusInfinity()).IsMinusInfinity());
+  EXPECT_TRUE((finite - Frequency::PlusInfinity()).IsMinusInfinity());
+}
+
+TEST(UnitConversionTest, TimeDeltaAndFrequency) {
+  EXPECT_EQ(1 / Frequency::Hertz(50), TimeDelta::Millis(20));
+  EXPECT_EQ(1 / TimeDelta::Millis(20), Frequency::Hertz(50));
+  EXPECT_EQ(Frequency::KiloHertz(200) * TimeDelta::Millis(2), 400.0);
+}
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/units/time_delta.cc b/third_party/libwebrtc/api/units/time_delta.cc
new file mode 100644
index 0000000000..31bf3e0106
--- /dev/null
+++ b/third_party/libwebrtc/api/units/time_delta.cc
@@ -0,0 +1,36 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/units/time_delta.h"
+
+#include "api/array_view.h"
+#include "rtc_base/strings/string_builder.h"
+
+namespace webrtc {
+
+std::string ToString(TimeDelta value) {
+  char buf[64];
+  rtc::SimpleStringBuilder sb(buf);
+  if (value.IsPlusInfinity()) {
+    sb << "+inf ms";
+  } else if (value.IsMinusInfinity()) {
+    sb << "-inf ms";
+  } else {
+    if (value.us() == 0 || (value.us() % 1000) != 0)
+      sb << value.us() << " us";
+    else if (value.ms() % 1000 != 0)
+      sb << value.ms() << " ms";
+    else
+      sb << value.seconds() << " s";
+  }
+  return sb.str();
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/units/time_delta.h b/third_party/libwebrtc/api/units/time_delta.h
new file mode 100644
index 0000000000..5981e32dce
--- /dev/null
+++ b/third_party/libwebrtc/api/units/time_delta.h
@@ -0,0 +1,110 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef API_UNITS_TIME_DELTA_H_
+#define API_UNITS_TIME_DELTA_H_
+
+#ifdef WEBRTC_UNIT_TEST
+#include <ostream>  // no-presubmit-check TODO(webrtc:8982)
+#endif              // WEBRTC_UNIT_TEST
+
+#include <cstdlib>
+#include <string>
+#include <type_traits>
+
+#include "rtc_base/units/unit_base.h"  // IWYU pragma: export
+
+namespace webrtc {
+
+// TimeDelta represents the difference between two timestamps. Commonly this can
+// be a duration. However since two Timestamps are not guaranteed to have the
+// same epoch (they might come from different computers, making exact
+// synchronisation infeasible), the duration covered by a TimeDelta can be
+// undefined. To simplify usage, it can be constructed and converted to
+// different units, specifically seconds (s), milliseconds (ms) and
+// microseconds (us).
+class TimeDelta final : public rtc_units_impl::RelativeUnit<TimeDelta> {
+ public:
+  template <typename T>
+  static constexpr TimeDelta Minutes(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return Seconds(value * 60);
+  }
+  template <typename T>
+  static constexpr TimeDelta Seconds(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromFraction(1'000'000, value);
+  }
+  template <typename T>
+  static constexpr TimeDelta Millis(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromFraction(1'000, value);
+  }
+  template <typename T>
+  static constexpr TimeDelta Micros(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromValue(value);
+  }
+
+  TimeDelta() = delete;
+
+  template <typename T = int64_t>
+  constexpr T seconds() const {
+    return ToFraction<1000000, T>();
+  }
+  template <typename T = int64_t>
+  constexpr T ms() const {
+    return ToFraction<1000, T>();
+  }
+  template <typename T = int64_t>
+  constexpr T us() const {
+    return ToValue<T>();
+  }
+  template <typename T = int64_t>
+  constexpr T ns() const {
+    return ToMultiple<1000, T>();
+  }
+
+  constexpr int64_t seconds_or(int64_t fallback_value) const {
+    return ToFractionOr<1000000>(fallback_value);
+  }
+  constexpr int64_t ms_or(int64_t fallback_value) const {
+    return ToFractionOr<1000>(fallback_value);
+  }
+  constexpr int64_t us_or(int64_t fallback_value) const {
+    return ToValueOr(fallback_value);
+  }
+
+  constexpr TimeDelta Abs() const {
+    return us() < 0 ? TimeDelta::Micros(-us()) : *this;
+  }
+
+ private:
+  friend class rtc_units_impl::UnitBase<TimeDelta>;
+  using RelativeUnit::RelativeUnit;
+  static constexpr bool one_sided = false;
+};
+
+std::string ToString(TimeDelta value);
+inline std::string ToLogString(TimeDelta value) {
+  return ToString(value);
+}
+
+#ifdef WEBRTC_UNIT_TEST
+inline std::ostream& operator<<(  // no-presubmit-check TODO(webrtc:8982)
+    std::ostream& stream,         // no-presubmit-check TODO(webrtc:8982)
+    TimeDelta value) {
+  return stream << ToString(value);
+}
+#endif  // WEBRTC_UNIT_TEST
+
+}  // namespace webrtc
+
+#endif  // API_UNITS_TIME_DELTA_H_
diff --git a/third_party/libwebrtc/api/units/time_delta_gn/moz.build b/third_party/libwebrtc/api/units/time_delta_gn/moz.build
new file mode 100644
index 0000000000..3fe57620d8
--- /dev/null
+++ b/third_party/libwebrtc/api/units/time_delta_gn/moz.build
@@ -0,0 +1,221 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/api/units/time_delta.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+if CONFIG["CPU_ARCH"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["CPU_ARCH"] == "arm":
+
+    CXXFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["CPU_ARCH"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["CPU_ARCH"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["CPU_ARCH"] == "arm" and CONFIG["OS_TARGET"] == "Android":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["CPU_ARCH"] == "x86" and CONFIG["OS_TARGET"] == "Android":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["CPU_ARCH"] == "aarch64" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "arm" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86" and CONFIG["OS_TARGET"] == "Linux":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86_64" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+Library("time_delta_gn")
diff --git a/third_party/libwebrtc/api/units/time_delta_unittest.cc b/third_party/libwebrtc/api/units/time_delta_unittest.cc
new file mode 100644
index 0000000000..51a7aa233a
--- /dev/null
+++ b/third_party/libwebrtc/api/units/time_delta_unittest.cc
@@ -0,0 +1,237 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/units/time_delta.h"
+
+#include <limits>
+
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace test {
+TEST(TimeDeltaTest, ConstExpr) {
+  constexpr int64_t kValue = -12345;
+  constexpr TimeDelta kTimeDeltaZero = TimeDelta::Zero();
+  constexpr TimeDelta kTimeDeltaPlusInf = TimeDelta::PlusInfinity();
+  constexpr TimeDelta kTimeDeltaMinusInf = TimeDelta::MinusInfinity();
+  static_assert(kTimeDeltaZero.IsZero(), "");
+  static_assert(kTimeDeltaPlusInf.IsPlusInfinity(), "");
+  static_assert(kTimeDeltaMinusInf.IsMinusInfinity(), "");
+  static_assert(kTimeDeltaPlusInf.ms_or(-1) == -1, "");
+
+  static_assert(kTimeDeltaPlusInf > kTimeDeltaZero, "");
+
+  constexpr TimeDelta kTimeDeltaMinutes = TimeDelta::Minutes(kValue);
+  constexpr TimeDelta kTimeDeltaSeconds = TimeDelta::Seconds(kValue);
+  constexpr TimeDelta kTimeDeltaMs = TimeDelta::Millis(kValue);
+  constexpr TimeDelta kTimeDeltaUs = TimeDelta::Micros(kValue);
+
+  static_assert(kTimeDeltaMinutes.seconds_or(0) == kValue * 60, "");
+  static_assert(kTimeDeltaSeconds.seconds_or(0) == kValue, "");
+  static_assert(kTimeDeltaMs.ms_or(0) == kValue, "");
+  static_assert(kTimeDeltaUs.us_or(0) == kValue, "");
+}
+
+TEST(TimeDeltaTest, GetBackSameValues) {
+  const int64_t kValue = 499;
+  for (int sign = -1; sign <= 1; ++sign) {
+    int64_t value = kValue * sign;
+    EXPECT_EQ(TimeDelta::Millis(value).ms(), value);
+    EXPECT_EQ(TimeDelta::Micros(value).us(), value);
+    EXPECT_EQ(TimeDelta::Seconds(value).seconds(), value);
+    EXPECT_EQ(TimeDelta::Seconds(value).seconds(), value);
+  }
+  EXPECT_EQ(TimeDelta::Zero().us(), 0);
+}
+
+TEST(TimeDeltaTest, GetDifferentPrefix) {
+  const int64_t kValue = 3000000;
+  EXPECT_EQ(TimeDelta::Micros(kValue).seconds(), kValue / 1000000);
+  EXPECT_EQ(TimeDelta::Millis(kValue).seconds(), kValue / 1000);
+  EXPECT_EQ(TimeDelta::Micros(kValue).ms(), kValue / 1000);
+  EXPECT_EQ(TimeDelta::Minutes(kValue / 60).seconds(), kValue);
+
+  EXPECT_EQ(TimeDelta::Millis(kValue).us(), kValue * 1000);
+  EXPECT_EQ(TimeDelta::Seconds(kValue).ms(), kValue * 1000);
+  EXPECT_EQ(TimeDelta::Seconds(kValue).us(), kValue * 1000000);
+  EXPECT_EQ(TimeDelta::Minutes(kValue / 60).seconds(), kValue);
+}
+
+TEST(TimeDeltaTest, IdentityChecks) {
+  const int64_t kValue = 3000;
+  EXPECT_TRUE(TimeDelta::Zero().IsZero());
+  EXPECT_FALSE(TimeDelta::Millis(kValue).IsZero());
+
+  EXPECT_TRUE(TimeDelta::PlusInfinity().IsInfinite());
+  EXPECT_TRUE(TimeDelta::MinusInfinity().IsInfinite());
+  EXPECT_FALSE(TimeDelta::Zero().IsInfinite());
+  EXPECT_FALSE(TimeDelta::Millis(-kValue).IsInfinite());
+  EXPECT_FALSE(TimeDelta::Millis(kValue).IsInfinite());
+
+  EXPECT_FALSE(TimeDelta::PlusInfinity().IsFinite());
+  EXPECT_FALSE(TimeDelta::MinusInfinity().IsFinite());
+  EXPECT_TRUE(TimeDelta::Millis(-kValue).IsFinite());
+  EXPECT_TRUE(TimeDelta::Millis(kValue).IsFinite());
+  EXPECT_TRUE(TimeDelta::Zero().IsFinite());
+
+  EXPECT_TRUE(TimeDelta::PlusInfinity().IsPlusInfinity());
+  EXPECT_FALSE(TimeDelta::MinusInfinity().IsPlusInfinity());
+
+  EXPECT_TRUE(TimeDelta::MinusInfinity().IsMinusInfinity());
+  EXPECT_FALSE(TimeDelta::PlusInfinity().IsMinusInfinity());
+}
+
+TEST(TimeDeltaTest, ComparisonOperators) {
+  const int64_t kSmall = 450;
+  const int64_t kLarge = 451;
+  const TimeDelta small = TimeDelta::Millis(kSmall);
+  const TimeDelta large = TimeDelta::Millis(kLarge);
+
+  EXPECT_EQ(TimeDelta::Zero(), TimeDelta::Millis(0));
+  EXPECT_EQ(TimeDelta::PlusInfinity(), TimeDelta::PlusInfinity());
+  EXPECT_EQ(small, TimeDelta::Millis(kSmall));
+  EXPECT_LE(small, TimeDelta::Millis(kSmall));
+  EXPECT_GE(small, TimeDelta::Millis(kSmall));
+  EXPECT_NE(small, TimeDelta::Millis(kLarge));
+  EXPECT_LE(small, TimeDelta::Millis(kLarge));
+  EXPECT_LT(small, TimeDelta::Millis(kLarge));
+  EXPECT_GE(large, TimeDelta::Millis(kSmall));
+  EXPECT_GT(large, TimeDelta::Millis(kSmall));
+  EXPECT_LT(TimeDelta::Zero(), small);
+  EXPECT_GT(TimeDelta::Zero(), TimeDelta::Millis(-kSmall));
+  EXPECT_GT(TimeDelta::Zero(), TimeDelta::Millis(-kSmall));
+
+  EXPECT_GT(TimeDelta::PlusInfinity(), large);
+  EXPECT_LT(TimeDelta::MinusInfinity(), TimeDelta::Zero());
+}
+
+TEST(TimeDeltaTest, Clamping) {
+  const TimeDelta upper = TimeDelta::Millis(800);
+  const TimeDelta lower = TimeDelta::Millis(100);
+  const TimeDelta under = TimeDelta::Millis(100);
+  const TimeDelta inside = TimeDelta::Millis(500);
+  const TimeDelta over = TimeDelta::Millis(1000);
+  EXPECT_EQ(under.Clamped(lower, upper), lower);
+  EXPECT_EQ(inside.Clamped(lower, upper), inside);
+  EXPECT_EQ(over.Clamped(lower, upper), upper);
+
+  TimeDelta mutable_delta = lower;
+  mutable_delta.Clamp(lower, upper);
+  EXPECT_EQ(mutable_delta, lower);
+  mutable_delta = inside;
+  mutable_delta.Clamp(lower, upper);
+  EXPECT_EQ(mutable_delta, inside);
+  mutable_delta = over;
+  mutable_delta.Clamp(lower, upper);
+  EXPECT_EQ(mutable_delta, upper);
+}
+
+TEST(TimeDeltaTest, CanBeInititializedFromLargeInt) {
+  const int kMaxInt = std::numeric_limits<int>::max();
+  EXPECT_EQ(TimeDelta::Seconds(kMaxInt).us(),
+            static_cast<int64_t>(kMaxInt) * 1000000);
+  EXPECT_EQ(TimeDelta::Millis(kMaxInt).us(),
+            static_cast<int64_t>(kMaxInt) * 1000);
+}
+
+TEST(TimeDeltaTest, ConvertsToAndFromDouble) {
+  const int64_t kMicros = 17017;
+  const double kNanosDouble = kMicros * 1e3;
+  const double kMicrosDouble = kMicros;
+  const double kMillisDouble = kMicros * 1e-3;
+  const double kSecondsDouble = kMillisDouble * 1e-3;
+
+  EXPECT_EQ(TimeDelta::Micros(kMicros).seconds<double>(), kSecondsDouble);
+  EXPECT_EQ(TimeDelta::Seconds(kSecondsDouble).us(), kMicros);
+
+  EXPECT_EQ(TimeDelta::Micros(kMicros).ms<double>(), kMillisDouble);
+  EXPECT_EQ(TimeDelta::Millis(kMillisDouble).us(), kMicros);
+
+  EXPECT_EQ(TimeDelta::Micros(kMicros).us<double>(), kMicrosDouble);
+  EXPECT_EQ(TimeDelta::Micros(kMicrosDouble).us(), kMicros);
+
+  EXPECT_NEAR(TimeDelta::Micros(kMicros).ns<double>(), kNanosDouble, 1);
+
+  const double kPlusInfinity = std::numeric_limits<double>::infinity();
+  const double kMinusInfinity = -kPlusInfinity;
+
+  EXPECT_EQ(TimeDelta::PlusInfinity().seconds<double>(), kPlusInfinity);
+  EXPECT_EQ(TimeDelta::MinusInfinity().seconds<double>(), kMinusInfinity);
+  EXPECT_EQ(TimeDelta::PlusInfinity().ms<double>(), kPlusInfinity);
+  EXPECT_EQ(TimeDelta::MinusInfinity().ms<double>(), kMinusInfinity);
+  EXPECT_EQ(TimeDelta::PlusInfinity().us<double>(), kPlusInfinity);
+  EXPECT_EQ(TimeDelta::MinusInfinity().us<double>(), kMinusInfinity);
+  EXPECT_EQ(TimeDelta::PlusInfinity().ns<double>(), kPlusInfinity);
+  EXPECT_EQ(TimeDelta::MinusInfinity().ns<double>(), kMinusInfinity);
+
+  EXPECT_TRUE(TimeDelta::Seconds(kPlusInfinity).IsPlusInfinity());
+  EXPECT_TRUE(TimeDelta::Seconds(kMinusInfinity).IsMinusInfinity());
+  EXPECT_TRUE(TimeDelta::Millis(kPlusInfinity).IsPlusInfinity());
+  EXPECT_TRUE(TimeDelta::Millis(kMinusInfinity).IsMinusInfinity());
+  EXPECT_TRUE(TimeDelta::Micros(kPlusInfinity).IsPlusInfinity());
+  EXPECT_TRUE(TimeDelta::Micros(kMinusInfinity).IsMinusInfinity());
+}
+
+TEST(TimeDeltaTest, MathOperations) {
+  const int64_t kValueA = 267;
+  const int64_t kValueB = 450;
+  const TimeDelta delta_a = TimeDelta::Millis(kValueA);
+  const TimeDelta delta_b = TimeDelta::Millis(kValueB);
+  EXPECT_EQ((delta_a + delta_b).ms(), kValueA + kValueB);
+  EXPECT_EQ((delta_a - delta_b).ms(), kValueA - kValueB);
+
+  EXPECT_EQ((delta_b / 10).ms(), kValueB / 10);
+  EXPECT_EQ(delta_b / delta_a, static_cast<double>(kValueB) / kValueA);
+
+  EXPECT_EQ(TimeDelta::Micros(-kValueA).Abs().us(), kValueA);
+  EXPECT_EQ(TimeDelta::Micros(kValueA).Abs().us(), kValueA);
+
+  TimeDelta mutable_delta = TimeDelta::Millis(kValueA);
+  mutable_delta += TimeDelta::Millis(kValueB);
+  EXPECT_EQ(mutable_delta, TimeDelta::Millis(kValueA + kValueB));
+  mutable_delta -= TimeDelta::Millis(kValueB);
+  EXPECT_EQ(mutable_delta, TimeDelta::Millis(kValueA));
+}
+
+TEST(TimeDeltaTest, MultiplyByScalar) {
+  const TimeDelta kValue = TimeDelta::Micros(267);
+  const int64_t kInt64 = 450;
+  const int32_t kInt32 = 123;
+  const size_t kUnsignedInt = 125;
+  const double kFloat = 123.0;
+
+  EXPECT_EQ((kValue * kInt64).us(), kValue.us() * kInt64);
+  EXPECT_EQ(kValue * kInt64, kInt64 * kValue);
+
+  EXPECT_EQ((kValue * kInt32).us(), kValue.us() * kInt32);
+  EXPECT_EQ(kValue * kInt32, kInt32 * kValue);
+
+  EXPECT_EQ((kValue * kUnsignedInt).us(), kValue.us() * int64_t{kUnsignedInt});
+  EXPECT_EQ(kValue * kUnsignedInt, kUnsignedInt * kValue);
+
+  EXPECT_DOUBLE_EQ((kValue * kFloat).us(), kValue.us() * kFloat);
+  EXPECT_EQ(kValue * kFloat, kFloat * kValue);
+}
+
+TEST(TimeDeltaTest, InfinityOperations) {
+  const int64_t kValue = 267;
+  const TimeDelta finite = TimeDelta::Millis(kValue);
+  EXPECT_TRUE((TimeDelta::PlusInfinity() + finite).IsPlusInfinity());
+  EXPECT_TRUE((TimeDelta::PlusInfinity() - finite).IsPlusInfinity());
+  EXPECT_TRUE((finite + TimeDelta::PlusInfinity()).IsPlusInfinity());
+  EXPECT_TRUE((finite - TimeDelta::MinusInfinity()).IsPlusInfinity());
+
+  EXPECT_TRUE((TimeDelta::MinusInfinity() + finite).IsMinusInfinity());
+  EXPECT_TRUE((TimeDelta::MinusInfinity() - finite).IsMinusInfinity());
+  EXPECT_TRUE((finite + TimeDelta::MinusInfinity()).IsMinusInfinity());
+  EXPECT_TRUE((finite - TimeDelta::PlusInfinity()).IsMinusInfinity());
+}
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/units/timestamp.cc b/third_party/libwebrtc/api/units/timestamp.cc
new file mode 100644
index 0000000000..fc4f419596
--- /dev/null
+++ b/third_party/libwebrtc/api/units/timestamp.cc
@@ -0,0 +1,34 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/units/timestamp.h"
+
+#include "api/array_view.h"
+#include "rtc_base/strings/string_builder.h"
+
+namespace webrtc {
+std::string ToString(Timestamp value) {
+  char buf[64];
+  rtc::SimpleStringBuilder sb(buf);
+  if (value.IsPlusInfinity()) {
+    sb << "+inf ms";
+  } else if (value.IsMinusInfinity()) {
+    sb << "-inf ms";
+  } else {
+    if (value.us() == 0 || (value.us() % 1000) != 0)
+      sb << value.us() << " us";
+    else if (value.ms() % 1000 != 0)
+      sb << value.ms() << " ms";
+    else
+      sb << value.seconds() << " s";
+  }
+  return sb.str();
+}
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/units/timestamp.h b/third_party/libwebrtc/api/units/timestamp.h
new file mode 100644
index 0000000000..8aabe05cad
--- /dev/null
+++ b/third_party/libwebrtc/api/units/timestamp.h
@@ -0,0 +1,139 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef API_UNITS_TIMESTAMP_H_
+#define API_UNITS_TIMESTAMP_H_
+
+#ifdef WEBRTC_UNIT_TEST
+#include <ostream>  // no-presubmit-check TODO(webrtc:8982)
+#endif              // WEBRTC_UNIT_TEST
+
+#include <string>
+#include <type_traits>
+
+#include "api/units/time_delta.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/units/unit_base.h"  // IWYU pragma: export
+
+namespace webrtc {
+// Timestamp represents the time that has passed since some unspecified epoch.
+// The epoch is assumed to be before any represented timestamps, this means that
+// negative values are not valid. The most notable feature is that the
+// difference of two Timestamps results in a TimeDelta.
+class Timestamp final : public rtc_units_impl::UnitBase<Timestamp> {
+ public:
+  template <typename T>
+  static constexpr Timestamp Seconds(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromFraction(1'000'000, value);
+  }
+  template <typename T>
+  static constexpr Timestamp Millis(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromFraction(1'000, value);
+  }
+  template <typename T>
+  static constexpr Timestamp Micros(T value) {
+    static_assert(std::is_arithmetic<T>::value, "");
+    return FromValue(value);
+  }
+
+  Timestamp() = delete;
+
+  template <typename T = int64_t>
+  constexpr T seconds() const {
+    return ToFraction<1000000, T>();
+  }
+  template <typename T = int64_t>
+  constexpr T ms() const {
+    return ToFraction<1000, T>();
+  }
+  template <typename T = int64_t>
+  constexpr T us() const {
+    return ToValue<T>();
+  }
+
+  constexpr int64_t seconds_or(int64_t fallback_value) const {
+    return ToFractionOr<1000000>(fallback_value);
+  }
+  constexpr int64_t ms_or(int64_t fallback_value) const {
+    return ToFractionOr<1000>(fallback_value);
+  }
+  constexpr int64_t us_or(int64_t fallback_value) const {
+    return ToValueOr(fallback_value);
+  }
+
+  constexpr Timestamp operator+(const TimeDelta delta) const {
+    if (IsPlusInfinity() || delta.IsPlusInfinity()) {
+      RTC_DCHECK(!IsMinusInfinity());
+      RTC_DCHECK(!delta.IsMinusInfinity());
+      return PlusInfinity();
+    } else if (IsMinusInfinity() || delta.IsMinusInfinity()) {
+      RTC_DCHECK(!IsPlusInfinity());
+      RTC_DCHECK(!delta.IsPlusInfinity());
+      return MinusInfinity();
+    }
+    return Timestamp::Micros(us() + delta.us());
+  }
+  constexpr Timestamp operator-(const TimeDelta delta) const {
+    if (IsPlusInfinity() || delta.IsMinusInfinity()) {
+      RTC_DCHECK(!IsMinusInfinity());
+      RTC_DCHECK(!delta.IsPlusInfinity());
+      return PlusInfinity();
+    } else if (IsMinusInfinity() || delta.IsPlusInfinity()) {
+      RTC_DCHECK(!IsPlusInfinity());
+      RTC_DCHECK(!delta.IsMinusInfinity());
+      return MinusInfinity();
+    }
+    return Timestamp::Micros(us() - delta.us());
+  }
+  constexpr TimeDelta operator-(const Timestamp other) const {
+    if (IsPlusInfinity() || other.IsMinusInfinity()) {
+      RTC_DCHECK(!IsMinusInfinity());
+      RTC_DCHECK(!other.IsPlusInfinity());
+      return TimeDelta::PlusInfinity();
+    } else if (IsMinusInfinity() || other.IsPlusInfinity()) {
+      RTC_DCHECK(!IsPlusInfinity());
+      RTC_DCHECK(!other.IsMinusInfinity());
+      return TimeDelta::MinusInfinity();
+    }
+    return TimeDelta::Micros(us() - other.us());
+  }
+  constexpr Timestamp& operator-=(const TimeDelta delta) {
+    *this = *this - delta;
+    return *this;
+  }
+  constexpr Timestamp& operator+=(const TimeDelta delta) {
+    *this = *this + delta;
+    return *this;
+  }
+
+ private:
+  friend class rtc_units_impl::UnitBase<Timestamp>;
+  using UnitBase::UnitBase;
+  static constexpr bool one_sided = true;
+};
+
+std::string ToString(Timestamp value);
+inline std::string ToLogString(Timestamp value) {
+  return ToString(value);
+}
+
+#ifdef WEBRTC_UNIT_TEST
+inline std::ostream& operator<<(  // no-presubmit-check TODO(webrtc:8982)
+    std::ostream& stream,         // no-presubmit-check TODO(webrtc:8982)
+    Timestamp value) {
+  return stream << ToString(value);
+}
+#endif  // WEBRTC_UNIT_TEST
+
+}  // namespace webrtc
+
+#endif  // API_UNITS_TIMESTAMP_H_
diff --git a/third_party/libwebrtc/api/units/timestamp_gn/moz.build b/third_party/libwebrtc/api/units/timestamp_gn/moz.build
new file mode 100644
index 0000000000..a869cbcd71
--- /dev/null
+++ b/third_party/libwebrtc/api/units/timestamp_gn/moz.build
@@ -0,0 +1,221 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/api/units/timestamp.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+if CONFIG["CPU_ARCH"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["CPU_ARCH"] == "arm":
+
+    CXXFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["CPU_ARCH"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["CPU_ARCH"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["CPU_ARCH"] == "arm" and CONFIG["OS_TARGET"] == "Android":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["CPU_ARCH"] == "x86" and CONFIG["OS_TARGET"] == "Android":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["CPU_ARCH"] == "aarch64" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "arm" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86" and CONFIG["OS_TARGET"] == "Linux":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["CPU_ARCH"] == "x86_64" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+Library("timestamp_gn")
diff --git a/third_party/libwebrtc/api/units/timestamp_unittest.cc b/third_party/libwebrtc/api/units/timestamp_unittest.cc
new file mode 100644
index 0000000000..43b2985d43
--- /dev/null
+++ b/third_party/libwebrtc/api/units/timestamp_unittest.cc
@@ -0,0 +1,162 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <limits>
+
+#include "api/units/timestamp.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace test {
+TEST(TimestampTest, ConstExpr) {
+  constexpr int64_t kValue = 12345;
+  constexpr Timestamp kTimestampInf = Timestamp::PlusInfinity();
+  static_assert(kTimestampInf.IsInfinite(), "");
+  static_assert(kTimestampInf.ms_or(-1) == -1, "");
+
+  constexpr Timestamp kTimestampSeconds = Timestamp::Seconds(kValue);
+  constexpr Timestamp kTimestampMs = Timestamp::Millis(kValue);
+  constexpr Timestamp kTimestampUs = Timestamp::Micros(kValue);
+
+  static_assert(kTimestampSeconds.seconds_or(0) == kValue, "");
+  static_assert(kTimestampMs.ms_or(0) == kValue, "");
+  static_assert(kTimestampUs.us_or(0) == kValue, "");
+
+  static_assert(kTimestampMs > kTimestampUs, "");
+
+  EXPECT_EQ(kTimestampSeconds.seconds(), kValue);
+  EXPECT_EQ(kTimestampMs.ms(), kValue);
+  EXPECT_EQ(kTimestampUs.us(), kValue);
+}
+
+TEST(TimestampTest, GetBackSameValues) {
+  const int64_t kValue = 499;
+  EXPECT_EQ(Timestamp::Millis(kValue).ms(), kValue);
+  EXPECT_EQ(Timestamp::Micros(kValue).us(), kValue);
+  EXPECT_EQ(Timestamp::Seconds(kValue).seconds(), kValue);
+}
+
+TEST(TimestampTest, GetDifferentPrefix) {
+  const int64_t kValue = 3000000;
+  EXPECT_EQ(Timestamp::Micros(kValue).seconds(), kValue / 1000000);
+  EXPECT_EQ(Timestamp::Millis(kValue).seconds(), kValue / 1000);
+  EXPECT_EQ(Timestamp::Micros(kValue).ms(), kValue / 1000);
+
+  EXPECT_EQ(Timestamp::Millis(kValue).us(), kValue * 1000);
+  EXPECT_EQ(Timestamp::Seconds(kValue).ms(), kValue * 1000);
+  EXPECT_EQ(Timestamp::Seconds(kValue).us(), kValue * 1000000);
+}
+
+TEST(TimestampTest, IdentityChecks) {
+  const int64_t kValue = 3000;
+
+  EXPECT_TRUE(Timestamp::PlusInfinity().IsInfinite());
+  EXPECT_TRUE(Timestamp::MinusInfinity().IsInfinite());
+  EXPECT_FALSE(Timestamp::Millis(kValue).IsInfinite());
+
+  EXPECT_FALSE(Timestamp::PlusInfinity().IsFinite());
+  EXPECT_FALSE(Timestamp::MinusInfinity().IsFinite());
+  EXPECT_TRUE(Timestamp::Millis(kValue).IsFinite());
+
+  EXPECT_TRUE(Timestamp::PlusInfinity().IsPlusInfinity());
+  EXPECT_FALSE(Timestamp::MinusInfinity().IsPlusInfinity());
+
+  EXPECT_TRUE(Timestamp::MinusInfinity().IsMinusInfinity());
+  EXPECT_FALSE(Timestamp::PlusInfinity().IsMinusInfinity());
+}
+
+TEST(TimestampTest, ComparisonOperators) {
+  const int64_t kSmall = 450;
+  const int64_t kLarge = 451;
+
+  EXPECT_EQ(Timestamp::PlusInfinity(), Timestamp::PlusInfinity());
+  EXPECT_GE(Timestamp::PlusInfinity(), Timestamp::PlusInfinity());
+  EXPECT_GT(Timestamp::PlusInfinity(), Timestamp::Millis(kLarge));
+  EXPECT_EQ(Timestamp::Millis(kSmall), Timestamp::Millis(kSmall));
+  EXPECT_LE(Timestamp::Millis(kSmall), Timestamp::Millis(kSmall));
+  EXPECT_GE(Timestamp::Millis(kSmall), Timestamp::Millis(kSmall));
+  EXPECT_NE(Timestamp::Millis(kSmall), Timestamp::Millis(kLarge));
+  EXPECT_LE(Timestamp::Millis(kSmall), Timestamp::Millis(kLarge));
+  EXPECT_LT(Timestamp::Millis(kSmall), Timestamp::Millis(kLarge));
+  EXPECT_GE(Timestamp::Millis(kLarge), Timestamp::Millis(kSmall));
+  EXPECT_GT(Timestamp::Millis(kLarge), Timestamp::Millis(kSmall));
+}
+
+TEST(TimestampTest, CanBeInititializedFromLargeInt) {
+  const int kMaxInt = std::numeric_limits<int>::max();
+  EXPECT_EQ(Timestamp::Seconds(kMaxInt).us(),
+            static_cast<int64_t>(kMaxInt) * 1000000);
+  EXPECT_EQ(Timestamp::Millis(kMaxInt).us(),
+            static_cast<int64_t>(kMaxInt) * 1000);
+}
+
+TEST(TimestampTest, ConvertsToAndFromDouble) {
+  const int64_t kMicros = 17017;
+  const double kMicrosDouble = kMicros;
+  const double kMillisDouble = kMicros * 1e-3;
+  const double kSecondsDouble = kMillisDouble * 1e-3;
+
+  EXPECT_EQ(Timestamp::Micros(kMicros).seconds<double>(), kSecondsDouble);
+  EXPECT_EQ(Timestamp::Seconds(kSecondsDouble).us(), kMicros);
+
+  EXPECT_EQ(Timestamp::Micros(kMicros).ms<double>(), kMillisDouble);
+  EXPECT_EQ(Timestamp::Millis(kMillisDouble).us(), kMicros);
+
+  EXPECT_EQ(Timestamp::Micros(kMicros).us<double>(), kMicrosDouble);
+  EXPECT_EQ(Timestamp::Micros(kMicrosDouble).us(), kMicros);
+
+  const double kPlusInfinity = std::numeric_limits<double>::infinity();
+  const double kMinusInfinity = -kPlusInfinity;
+
+  EXPECT_EQ(Timestamp::PlusInfinity().seconds<double>(), kPlusInfinity);
+  EXPECT_EQ(Timestamp::MinusInfinity().seconds<double>(), kMinusInfinity);
+  EXPECT_EQ(Timestamp::PlusInfinity().ms<double>(), kPlusInfinity);
+  EXPECT_EQ(Timestamp::MinusInfinity().ms<double>(), kMinusInfinity);
+  EXPECT_EQ(Timestamp::PlusInfinity().us<double>(), kPlusInfinity);
+  EXPECT_EQ(Timestamp::MinusInfinity().us<double>(), kMinusInfinity);
+
+  EXPECT_TRUE(Timestamp::Seconds(kPlusInfinity).IsPlusInfinity());
+  EXPECT_TRUE(Timestamp::Seconds(kMinusInfinity).IsMinusInfinity());
+  EXPECT_TRUE(Timestamp::Millis(kPlusInfinity).IsPlusInfinity());
+  EXPECT_TRUE(Timestamp::Millis(kMinusInfinity).IsMinusInfinity());
+  EXPECT_TRUE(Timestamp::Micros(kPlusInfinity).IsPlusInfinity());
+  EXPECT_TRUE(Timestamp::Micros(kMinusInfinity).IsMinusInfinity());
+}
+
+TEST(UnitConversionTest, TimestampAndTimeDeltaMath) {
+  const int64_t kValueA = 267;
+  const int64_t kValueB = 450;
+  const Timestamp time_a = Timestamp::Millis(kValueA);
+  const Timestamp time_b = Timestamp::Millis(kValueB);
+  const TimeDelta delta_a = TimeDelta::Millis(kValueA);
+  const TimeDelta delta_b = TimeDelta::Millis(kValueB);
+
+  EXPECT_EQ((time_a - time_b), TimeDelta::Millis(kValueA - kValueB));
+  EXPECT_EQ((time_b - delta_a), Timestamp::Millis(kValueB - kValueA));
+  EXPECT_EQ((time_b + delta_a), Timestamp::Millis(kValueB + kValueA));
+
+  Timestamp mutable_time = time_a;
+  mutable_time += delta_b;
+  EXPECT_EQ(mutable_time, time_a + delta_b);
+  mutable_time -= delta_b;
+  EXPECT_EQ(mutable_time, time_a);
+}
+
+TEST(UnitConversionTest, InfinityOperations) {
+  const int64_t kValue = 267;
+  const Timestamp finite_time = Timestamp::Millis(kValue);
+  const TimeDelta finite_delta = TimeDelta::Millis(kValue);
+  EXPECT_TRUE((Timestamp::PlusInfinity() + finite_delta).IsInfinite());
+  EXPECT_TRUE((Timestamp::PlusInfinity() - finite_delta).IsInfinite());
+  EXPECT_TRUE((finite_time + TimeDelta::PlusInfinity()).IsInfinite());
+  EXPECT_TRUE((finite_time - TimeDelta::MinusInfinity()).IsInfinite());
+}
+}  // namespace test
+}  // namespace webrtc