Adding upstream version 124.0.1.upstream/124.0.1

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

17 files changed, 4409 insertions, 0 deletions

diff --git a/third_party/libwebrtc/build/android/gyp/util/__init__.py b/third_party/libwebrtc/build/android/gyp/util/__init__.py
new file mode 100644
index 0000000000..96196cffb2
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/__init__.py
@@ -0,0 +1,3 @@
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
diff --git a/third_party/libwebrtc/build/android/gyp/util/build_utils.py b/third_party/libwebrtc/build/android/gyp/util/build_utils.py
new file mode 100644
index 0000000000..6469f762cc
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/build_utils.py
@@ -0,0 +1,725 @@
+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Contains common helpers for GN action()s."""
+
+import atexit
+import collections
+import contextlib
+import filecmp
+import fnmatch
+import json
+import logging
+import os
+import pipes
+import re
+import shutil
+import stat
+import subprocess
+import sys
+import tempfile
+import time
+import zipfile
+
+sys.path.append(os.path.join(os.path.dirname(__file__),
+                             os.pardir, os.pardir, os.pardir))
+import gn_helpers
+
+# Use relative paths to improved hermetic property of build scripts.
+DIR_SOURCE_ROOT = os.path.relpath(
+    os.environ.get(
+        'CHECKOUT_SOURCE_ROOT',
+        os.path.join(
+            os.path.dirname(__file__), os.pardir, os.pardir, os.pardir,
+            os.pardir)))
+JAVA_HOME = os.path.join(DIR_SOURCE_ROOT, 'third_party', 'jdk', 'current')
+JAVAC_PATH = os.path.join(JAVA_HOME, 'bin', 'javac')
+JAVAP_PATH = os.path.join(JAVA_HOME, 'bin', 'javap')
+RT_JAR_PATH = os.path.join(DIR_SOURCE_ROOT, 'third_party', 'jdk', 'extras',
+                           'java_8', 'jre', 'lib', 'rt.jar')
+
+try:
+  string_types = basestring
+except NameError:
+  string_types = (str, bytes)
+
+
+def JavaCmd(verify=True, xmx='1G'):
+  ret = [os.path.join(JAVA_HOME, 'bin', 'java')]
+  # Limit heap to avoid Java not GC'ing when it should, and causing
+  # bots to OOM when many java commands are runnig at the same time
+  # https://crbug.com/1098333
+  ret += ['-Xmx' + xmx]
+
+  # Disable bytecode verification for local builds gives a ~2% speed-up.
+  if not verify:
+    ret += ['-noverify']
+
+  return ret
+
+
+@contextlib.contextmanager
+def TempDir(**kwargs):
+  dirname = tempfile.mkdtemp(**kwargs)
+  try:
+    yield dirname
+  finally:
+    shutil.rmtree(dirname)
+
+
+def MakeDirectory(dir_path):
+  try:
+    os.makedirs(dir_path)
+  except OSError:
+    pass
+
+
+def DeleteDirectory(dir_path):
+  if os.path.exists(dir_path):
+    shutil.rmtree(dir_path)
+
+
+def Touch(path, fail_if_missing=False):
+  if fail_if_missing and not os.path.exists(path):
+    raise Exception(path + ' doesn\'t exist.')
+
+  MakeDirectory(os.path.dirname(path))
+  with open(path, 'a'):
+    os.utime(path, None)
+
+
+def FindInDirectory(directory, filename_filter='*'):
+  files = []
+  for root, _dirnames, filenames in os.walk(directory):
+    matched_files = fnmatch.filter(filenames, filename_filter)
+    files.extend((os.path.join(root, f) for f in matched_files))
+  return files
+
+
+def ParseGnList(value):
+  """Converts a "GN-list" command-line parameter into a list.
+
+  Conversions handled:
+    * None -> []
+    * '' -> []
+    * 'asdf' -> ['asdf']
+    * '["a", "b"]' -> ['a', 'b']
+    * ['["a", "b"]', 'c'] -> ['a', 'b', 'c']  (flattened list)
+
+  The common use for this behavior is in the Android build where things can
+  take lists of @FileArg references that are expanded via ExpandFileArgs.
+  """
+  # Convert None to [].
+  if not value:
+    return []
+  # Convert a list of GN lists to a flattened list.
+  if isinstance(value, list):
+    ret = []
+    for arg in value:
+      ret.extend(ParseGnList(arg))
+    return ret
+  # Convert normal GN list.
+  if value.startswith('['):
+    return gn_helpers.GNValueParser(value).ParseList()
+  # Convert a single string value to a list.
+  return [value]
+
+
+def CheckOptions(options, parser, required=None):
+  if not required:
+    return
+  for option_name in required:
+    if getattr(options, option_name) is None:
+      parser.error('--%s is required' % option_name.replace('_', '-'))
+
+
+def WriteJson(obj, path, only_if_changed=False):
+  old_dump = None
+  if os.path.exists(path):
+    with open(path, 'r') as oldfile:
+      old_dump = oldfile.read()
+
+  new_dump = json.dumps(obj, sort_keys=True, indent=2, separators=(',', ': '))
+
+  if not only_if_changed or old_dump != new_dump:
+    with open(path, 'w') as outfile:
+      outfile.write(new_dump)
+
+
+@contextlib.contextmanager
+def AtomicOutput(path, only_if_changed=True, mode='w+b'):
+  """Helper to prevent half-written outputs.
+
+  Args:
+    path: Path to the final output file, which will be written atomically.
+    only_if_changed: If True (the default), do not touch the filesystem
+      if the content has not changed.
+    mode: The mode to open the file in (str).
+  Returns:
+    A python context manager that yelds a NamedTemporaryFile instance
+    that must be used by clients to write the data to. On exit, the
+    manager will try to replace the final output file with the
+    temporary one if necessary. The temporary file is always destroyed
+    on exit.
+  Example:
+    with build_utils.AtomicOutput(output_path) as tmp_file:
+      subprocess.check_call(['prog', '--output', tmp_file.name])
+  """
+  # Create in same directory to ensure same filesystem when moving.
+  dirname = os.path.dirname(path)
+  if not os.path.exists(dirname):
+    MakeDirectory(dirname)
+  with tempfile.NamedTemporaryFile(
+      mode, suffix=os.path.basename(path), dir=dirname, delete=False) as f:
+    try:
+      yield f
+
+      # file should be closed before comparison/move.
+      f.close()
+      if not (only_if_changed and os.path.exists(path) and
+              filecmp.cmp(f.name, path)):
+        shutil.move(f.name, path)
+    finally:
+      if os.path.exists(f.name):
+        os.unlink(f.name)
+
+
+class CalledProcessError(Exception):
+  """This exception is raised when the process run by CheckOutput
+  exits with a non-zero exit code."""
+
+  def __init__(self, cwd, args, output):
+    super(CalledProcessError, self).__init__()
+    self.cwd = cwd
+    self.args = args
+    self.output = output
+
+  def __str__(self):
+    # A user should be able to simply copy and paste the command that failed
+    # into their shell.
+    copyable_command = '( cd {}; {} )'.format(os.path.abspath(self.cwd),
+        ' '.join(map(pipes.quote, self.args)))
+    return 'Command failed: {}\n{}'.format(copyable_command, self.output)
+
+
+def FilterLines(output, filter_string):
+  """Output filter from build_utils.CheckOutput.
+
+  Args:
+    output: Executable output as from build_utils.CheckOutput.
+    filter_string: An RE string that will filter (remove) matching
+        lines from |output|.
+
+  Returns:
+    The filtered output, as a single string.
+  """
+  re_filter = re.compile(filter_string)
+  return '\n'.join(
+      line for line in output.split('\n') if not re_filter.search(line))
+
+
+def FilterReflectiveAccessJavaWarnings(output):
+  """Filters out warnings about illegal reflective access operation.
+
+  These warnings were introduced in Java 9, and generally mean that dependencies
+  need to be updated.
+  """
+  #  WARNING: An illegal reflective access operation has occurred
+  #  WARNING: Illegal reflective access by ...
+  #  WARNING: Please consider reporting this to the maintainers of ...
+  #  WARNING: Use --illegal-access=warn to enable warnings of further ...
+  #  WARNING: All illegal access operations will be denied in a future release
+  return FilterLines(
+      output, r'WARNING: ('
+      'An illegal reflective|'
+      'Illegal reflective access|'
+      'Please consider reporting this to|'
+      'Use --illegal-access=warn|'
+      'All illegal access operations)')
+
+
+# This can be used in most cases like subprocess.check_output(). The output,
+# particularly when the command fails, better highlights the command's failure.
+# If the command fails, raises a build_utils.CalledProcessError.
+def CheckOutput(args,
+                cwd=None,
+                env=None,
+                print_stdout=False,
+                print_stderr=True,
+                stdout_filter=None,
+                stderr_filter=None,
+                fail_on_output=True,
+                fail_func=lambda returncode, stderr: returncode != 0):
+  if not cwd:
+    cwd = os.getcwd()
+
+  logging.info('CheckOutput: %s', ' '.join(args))
+  child = subprocess.Popen(args,
+      stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=cwd, env=env)
+  stdout, stderr = child.communicate()
+
+  # For Python3 only:
+  if isinstance(stdout, bytes) and sys.version_info >= (3, ):
+    stdout = stdout.decode('utf-8')
+    stderr = stderr.decode('utf-8')
+
+  if stdout_filter is not None:
+    stdout = stdout_filter(stdout)
+
+  if stderr_filter is not None:
+    stderr = stderr_filter(stderr)
+
+  if fail_func and fail_func(child.returncode, stderr):
+    raise CalledProcessError(cwd, args, stdout + stderr)
+
+  if print_stdout:
+    sys.stdout.write(stdout)
+  if print_stderr:
+    sys.stderr.write(stderr)
+
+  has_stdout = print_stdout and stdout
+  has_stderr = print_stderr and stderr
+  if fail_on_output and (has_stdout or has_stderr):
+    MSG = """\
+Command failed because it wrote to {}.
+You can often set treat_warnings_as_errors=false to not treat output as \
+failure (useful when developing locally)."""
+    if has_stdout and has_stderr:
+      stream_string = 'stdout and stderr'
+    elif has_stdout:
+      stream_string = 'stdout'
+    else:
+      stream_string = 'stderr'
+    raise CalledProcessError(cwd, args, MSG.format(stream_string))
+
+  return stdout
+
+
+def GetModifiedTime(path):
+  # For a symlink, the modified time should be the greater of the link's
+  # modified time and the modified time of the target.
+  return max(os.lstat(path).st_mtime, os.stat(path).st_mtime)
+
+
+def IsTimeStale(output, inputs):
+  if not os.path.exists(output):
+    return True
+
+  output_time = GetModifiedTime(output)
+  for i in inputs:
+    if GetModifiedTime(i) > output_time:
+      return True
+  return False
+
+
+def _CheckZipPath(name):
+  if os.path.normpath(name) != name:
+    raise Exception('Non-canonical zip path: %s' % name)
+  if os.path.isabs(name):
+    raise Exception('Absolute zip path: %s' % name)
+
+
+def _IsSymlink(zip_file, name):
+  zi = zip_file.getinfo(name)
+
+  # The two high-order bytes of ZipInfo.external_attr represent
+  # UNIX permissions and file type bits.
+  return stat.S_ISLNK(zi.external_attr >> 16)
+
+
+def ExtractAll(zip_path, path=None, no_clobber=True, pattern=None,
+               predicate=None):
+  if path is None:
+    path = os.getcwd()
+  elif not os.path.exists(path):
+    MakeDirectory(path)
+
+  if not zipfile.is_zipfile(zip_path):
+    raise Exception('Invalid zip file: %s' % zip_path)
+
+  extracted = []
+  with zipfile.ZipFile(zip_path) as z:
+    for name in z.namelist():
+      if name.endswith('/'):
+        MakeDirectory(os.path.join(path, name))
+        continue
+      if pattern is not None:
+        if not fnmatch.fnmatch(name, pattern):
+          continue
+      if predicate and not predicate(name):
+        continue
+      _CheckZipPath(name)
+      if no_clobber:
+        output_path = os.path.join(path, name)
+        if os.path.exists(output_path):
+          raise Exception(
+              'Path already exists from zip: %s %s %s'
+              % (zip_path, name, output_path))
+      if _IsSymlink(z, name):
+        dest = os.path.join(path, name)
+        MakeDirectory(os.path.dirname(dest))
+        os.symlink(z.read(name), dest)
+        extracted.append(dest)
+      else:
+        z.extract(name, path)
+        extracted.append(os.path.join(path, name))
+
+  return extracted
+
+
+def HermeticDateTime(timestamp=None):
+  """Returns a constant ZipInfo.date_time tuple.
+
+  Args:
+    timestamp: Unix timestamp to use for files in the archive.
+
+  Returns:
+    A ZipInfo.date_time tuple for Jan 1, 2001, or the given timestamp.
+  """
+  if not timestamp:
+    return (2001, 1, 1, 0, 0, 0)
+  utc_time = time.gmtime(timestamp)
+  return (utc_time.tm_year, utc_time.tm_mon, utc_time.tm_mday, utc_time.tm_hour,
+          utc_time.tm_min, utc_time.tm_sec)
+
+
+def HermeticZipInfo(*args, **kwargs):
+  """Creates a zipfile.ZipInfo with a constant timestamp and external_attr.
+
+  If a date_time value is not provided in the positional or keyword arguments,
+  the default value from HermeticDateTime is used.
+
+  Args:
+    See zipfile.ZipInfo.
+
+  Returns:
+    A zipfile.ZipInfo.
+  """
+  # The caller may have provided a date_time either as a positional parameter
+  # (args[1]) or as a keyword parameter. Use the default hermetic date_time if
+  # none was provided.
+  date_time = None
+  if len(args) >= 2:
+    date_time = args[1]
+  elif 'date_time' in kwargs:
+    date_time = kwargs['date_time']
+  if not date_time:
+    kwargs['date_time'] = HermeticDateTime()
+  ret = zipfile.ZipInfo(*args, **kwargs)
+  ret.external_attr = (0o644 << 16)
+  return ret
+
+
+def AddToZipHermetic(zip_file,
+                     zip_path,
+                     src_path=None,
+                     data=None,
+                     compress=None,
+                     date_time=None):
+  """Adds a file to the given ZipFile with a hard-coded modified time.
+
+  Args:
+    zip_file: ZipFile instance to add the file to.
+    zip_path: Destination path within the zip file (or ZipInfo instance).
+    src_path: Path of the source file. Mutually exclusive with |data|.
+    data: File data as a string.
+    compress: Whether to enable compression. Default is taken from ZipFile
+        constructor.
+    date_time: The last modification date and time for the archive member.
+  """
+  assert (src_path is None) != (data is None), (
+      '|src_path| and |data| are mutually exclusive.')
+  if isinstance(zip_path, zipfile.ZipInfo):
+    zipinfo = zip_path
+    zip_path = zipinfo.filename
+  else:
+    zipinfo = HermeticZipInfo(filename=zip_path, date_time=date_time)
+
+  _CheckZipPath(zip_path)
+
+  if src_path and os.path.islink(src_path):
+    zipinfo.filename = zip_path
+    zipinfo.external_attr |= stat.S_IFLNK << 16  # mark as a symlink
+    zip_file.writestr(zipinfo, os.readlink(src_path))
+    return
+
+  # zipfile.write() does
+  #     external_attr = (os.stat(src_path)[0] & 0xFFFF) << 16
+  # but we want to use _HERMETIC_FILE_ATTR, so manually set
+  # the few attr bits we care about.
+  if src_path:
+    st = os.stat(src_path)
+    for mode in (stat.S_IXUSR, stat.S_IXGRP, stat.S_IXOTH):
+      if st.st_mode & mode:
+        zipinfo.external_attr |= mode << 16
+
+  if src_path:
+    with open(src_path, 'rb') as f:
+      data = f.read()
+
+  # zipfile will deflate even when it makes the file bigger. To avoid
+  # growing files, disable compression at an arbitrary cut off point.
+  if len(data) < 16:
+    compress = False
+
+  # None converts to ZIP_STORED, when passed explicitly rather than the
+  # default passed to the ZipFile constructor.
+  compress_type = zip_file.compression
+  if compress is not None:
+    compress_type = zipfile.ZIP_DEFLATED if compress else zipfile.ZIP_STORED
+  zip_file.writestr(zipinfo, data, compress_type)
+
+
+def DoZip(inputs,
+          output,
+          base_dir=None,
+          compress_fn=None,
+          zip_prefix_path=None,
+          timestamp=None):
+  """Creates a zip file from a list of files.
+
+  Args:
+    inputs: A list of paths to zip, or a list of (zip_path, fs_path) tuples.
+    output: Path, fileobj, or ZipFile instance to add files to.
+    base_dir: Prefix to strip from inputs.
+    compress_fn: Applied to each input to determine whether or not to compress.
+        By default, items will be |zipfile.ZIP_STORED|.
+    zip_prefix_path: Path prepended to file path in zip file.
+    timestamp: Unix timestamp to use for files in the archive.
+  """
+  if base_dir is None:
+    base_dir = '.'
+  input_tuples = []
+  for tup in inputs:
+    if isinstance(tup, string_types):
+      tup = (os.path.relpath(tup, base_dir), tup)
+      if tup[0].startswith('..'):
+        raise Exception('Invalid zip_path: ' + tup[0])
+    input_tuples.append(tup)
+
+  # Sort by zip path to ensure stable zip ordering.
+  input_tuples.sort(key=lambda tup: tup[0])
+
+  out_zip = output
+  if not isinstance(output, zipfile.ZipFile):
+    out_zip = zipfile.ZipFile(output, 'w')
+
+  date_time = HermeticDateTime(timestamp)
+  try:
+    for zip_path, fs_path in input_tuples:
+      if zip_prefix_path:
+        zip_path = os.path.join(zip_prefix_path, zip_path)
+      compress = compress_fn(zip_path) if compress_fn else None
+      AddToZipHermetic(out_zip,
+                       zip_path,
+                       src_path=fs_path,
+                       compress=compress,
+                       date_time=date_time)
+  finally:
+    if output is not out_zip:
+      out_zip.close()
+
+
+def ZipDir(output, base_dir, compress_fn=None, zip_prefix_path=None):
+  """Creates a zip file from a directory."""
+  inputs = []
+  for root, _, files in os.walk(base_dir):
+    for f in files:
+      inputs.append(os.path.join(root, f))
+
+  if isinstance(output, zipfile.ZipFile):
+    DoZip(
+        inputs,
+        output,
+        base_dir,
+        compress_fn=compress_fn,
+        zip_prefix_path=zip_prefix_path)
+  else:
+    with AtomicOutput(output) as f:
+      DoZip(
+          inputs,
+          f,
+          base_dir,
+          compress_fn=compress_fn,
+          zip_prefix_path=zip_prefix_path)
+
+
+def MatchesGlob(path, filters):
+  """Returns whether the given path matches any of the given glob patterns."""
+  return filters and any(fnmatch.fnmatch(path, f) for f in filters)
+
+
+def MergeZips(output, input_zips, path_transform=None, compress=None):
+  """Combines all files from |input_zips| into |output|.
+
+  Args:
+    output: Path, fileobj, or ZipFile instance to add files to.
+    input_zips: Iterable of paths to zip files to merge.
+    path_transform: Called for each entry path. Returns a new path, or None to
+        skip the file.
+    compress: Overrides compression setting from origin zip entries.
+  """
+  path_transform = path_transform or (lambda p: p)
+  added_names = set()
+
+  out_zip = output
+  if not isinstance(output, zipfile.ZipFile):
+    out_zip = zipfile.ZipFile(output, 'w')
+
+  try:
+    for in_file in input_zips:
+      with zipfile.ZipFile(in_file, 'r') as in_zip:
+        for info in in_zip.infolist():
+          # Ignore directories.
+          if info.filename[-1] == '/':
+            continue
+          dst_name = path_transform(info.filename)
+          if not dst_name:
+            continue
+          already_added = dst_name in added_names
+          if not already_added:
+            if compress is not None:
+              compress_entry = compress
+            else:
+              compress_entry = info.compress_type != zipfile.ZIP_STORED
+            AddToZipHermetic(
+                out_zip,
+                dst_name,
+                data=in_zip.read(info),
+                compress=compress_entry)
+            added_names.add(dst_name)
+  finally:
+    if output is not out_zip:
+      out_zip.close()
+
+
+def GetSortedTransitiveDependencies(top, deps_func):
+  """Gets the list of all transitive dependencies in sorted order.
+
+  There should be no cycles in the dependency graph (crashes if cycles exist).
+
+  Args:
+    top: A list of the top level nodes
+    deps_func: A function that takes a node and returns a list of its direct
+        dependencies.
+  Returns:
+    A list of all transitive dependencies of nodes in top, in order (a node will
+    appear in the list at a higher index than all of its dependencies).
+  """
+  # Find all deps depth-first, maintaining original order in the case of ties.
+  deps_map = collections.OrderedDict()
+  def discover(nodes):
+    for node in nodes:
+      if node in deps_map:
+        continue
+      deps = deps_func(node)
+      discover(deps)
+      deps_map[node] = deps
+
+  discover(top)
+  return list(deps_map)
+
+
+def InitLogging(enabling_env):
+  logging.basicConfig(
+      level=logging.DEBUG if os.environ.get(enabling_env) else logging.WARNING,
+      format='%(levelname).1s %(process)d %(relativeCreated)6d %(message)s')
+  script_name = os.path.basename(sys.argv[0])
+  logging.info('Started (%s)', script_name)
+
+  my_pid = os.getpid()
+
+  def log_exit():
+    # Do not log for fork'ed processes.
+    if os.getpid() == my_pid:
+      logging.info("Job's done (%s)", script_name)
+
+  atexit.register(log_exit)
+
+
+def AddDepfileOption(parser):
+  # TODO(agrieve): Get rid of this once we've moved to argparse.
+  if hasattr(parser, 'add_option'):
+    func = parser.add_option
+  else:
+    func = parser.add_argument
+  func('--depfile',
+       help='Path to depfile (refer to `gn help depfile`)')
+
+
+def WriteDepfile(depfile_path, first_gn_output, inputs=None):
+  assert depfile_path != first_gn_output  # http://crbug.com/646165
+  assert not isinstance(inputs, string_types)  # Easy mistake to make
+  inputs = inputs or []
+  MakeDirectory(os.path.dirname(depfile_path))
+  # Ninja does not support multiple outputs in depfiles.
+  with open(depfile_path, 'w') as depfile:
+    depfile.write(first_gn_output.replace(' ', '\\ '))
+    depfile.write(': \\\n ')
+    depfile.write(' \\\n '.join(i.replace(' ', '\\ ') for i in inputs))
+    depfile.write('\n')
+
+
+def ExpandFileArgs(args):
+  """Replaces file-arg placeholders in args.
+
+  These placeholders have the form:
+    @FileArg(filename:key1:key2:...:keyn)
+
+  The value of such a placeholder is calculated by reading 'filename' as json.
+  And then extracting the value at [key1][key2]...[keyn]. If a key has a '[]'
+  suffix the (intermediate) value will be interpreted as a single item list and
+  the single item will be returned or used for further traversal.
+
+  Note: This intentionally does not return the list of files that appear in such
+  placeholders. An action that uses file-args *must* know the paths of those
+  files prior to the parsing of the arguments (typically by explicitly listing
+  them in the action's inputs in build files).
+  """
+  new_args = list(args)
+  file_jsons = dict()
+  r = re.compile('@FileArg\((.*?)\)')
+  for i, arg in enumerate(args):
+    match = r.search(arg)
+    if not match:
+      continue
+
+    def get_key(key):
+      if key.endswith('[]'):
+        return key[:-2], True
+      return key, False
+
+    lookup_path = match.group(1).split(':')
+    file_path, _ = get_key(lookup_path[0])
+    if not file_path in file_jsons:
+      with open(file_path) as f:
+        file_jsons[file_path] = json.load(f)
+
+    expansion = file_jsons
+    for k in lookup_path:
+      k, flatten = get_key(k)
+      expansion = expansion[k]
+      if flatten:
+        if not isinstance(expansion, list) or not len(expansion) == 1:
+          raise Exception('Expected single item list but got %s' % expansion)
+        expansion = expansion[0]
+
+    # This should match ParseGnList. The output is either a GN-formatted list
+    # or a literal (with no quotes).
+    if isinstance(expansion, list):
+      new_args[i] = (arg[:match.start()] + gn_helpers.ToGNString(expansion) +
+                     arg[match.end():])
+    else:
+      new_args[i] = arg[:match.start()] + str(expansion) + arg[match.end():]
+
+  return new_args
+
+
+def ReadSourcesList(sources_list_file_name):
+  """Reads a GN-written file containing list of file names and returns a list.
+
+  Note that this function should not be used to parse response files.
+  """
+  with open(sources_list_file_name) as f:
+    return [file_name.strip() for file_name in f]
diff --git a/third_party/libwebrtc/build/android/gyp/util/build_utils_test.py b/third_party/libwebrtc/build/android/gyp/util/build_utils_test.py
new file mode 100755
index 0000000000..008ea11748
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/build_utils_test.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import collections
+import os
+import sys
+import unittest
+
+sys.path.insert(
+    0, os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir)))
+from util import build_utils
+
+_DEPS = collections.OrderedDict()
+_DEPS['a'] = []
+_DEPS['b'] = []
+_DEPS['c'] = ['a']
+_DEPS['d'] = ['a']
+_DEPS['e'] = ['f']
+_DEPS['f'] = ['a', 'd']
+_DEPS['g'] = []
+_DEPS['h'] = ['d', 'b', 'f']
+_DEPS['i'] = ['f']
+
+
+class BuildUtilsTest(unittest.TestCase):
+  def testGetSortedTransitiveDependencies_all(self):
+    TOP = _DEPS.keys()
+    EXPECTED = ['a', 'b', 'c', 'd', 'f', 'e', 'g', 'h', 'i']
+    actual = build_utils.GetSortedTransitiveDependencies(TOP, _DEPS.get)
+    self.assertEqual(EXPECTED, actual)
+
+  def testGetSortedTransitiveDependencies_leaves(self):
+    TOP = ['c', 'e', 'g', 'h', 'i']
+    EXPECTED = ['a', 'c', 'd', 'f', 'e', 'g', 'b', 'h', 'i']
+    actual = build_utils.GetSortedTransitiveDependencies(TOP, _DEPS.get)
+    self.assertEqual(EXPECTED, actual)
+
+  def testGetSortedTransitiveDependencies_leavesReverse(self):
+    TOP = ['i', 'h', 'g', 'e', 'c']
+    EXPECTED = ['a', 'd', 'f', 'i', 'b', 'h', 'g', 'e', 'c']
+    actual = build_utils.GetSortedTransitiveDependencies(TOP, _DEPS.get)
+    self.assertEqual(EXPECTED, actual)
+
+
+if __name__ == '__main__':
+  unittest.main()
diff --git a/third_party/libwebrtc/build/android/gyp/util/diff_utils.py b/third_party/libwebrtc/build/android/gyp/util/diff_utils.py
new file mode 100644
index 0000000000..530a688191
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/diff_utils.py
@@ -0,0 +1,127 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import sys
+
+import difflib
+from util import build_utils
+
+
+def _SkipOmitted(line):
+  """
+  Skip lines that are to be intentionally omitted from the expectations file.
+
+  This is required when the file to be compared against expectations contains
+  a line that changes from build to build because - for instance - it contains
+  version information.
+  """
+  if line.rstrip().endswith('# OMIT FROM EXPECTATIONS'):
+    return '# THIS LINE WAS OMITTED\n'
+  return line
+
+
+def _GenerateDiffWithOnlyAdditons(expected_path, actual_data):
+  """Generate a diff that only contains additions"""
+  # Ignore blank lines when creating the diff to cut down on whitespace-only
+  # lines in the diff. Also remove trailing whitespaces and add the new lines
+  # manually (ndiff expects new lines but we don't care about trailing
+  # whitespace).
+  with open(expected_path) as expected:
+    expected_lines = [l for l in expected.readlines() if l.strip()]
+  actual_lines = [
+      '{}\n'.format(l.rstrip()) for l in actual_data.splitlines() if l.strip()
+  ]
+
+  diff = difflib.ndiff(expected_lines, actual_lines)
+  filtered_diff = (l for l in diff if l.startswith('+'))
+  return ''.join(filtered_diff)
+
+
+def _DiffFileContents(expected_path, actual_data):
+  """Check file contents for equality and return the diff or None."""
+  # Remove all trailing whitespace and add it explicitly in the end.
+  with open(expected_path) as f_expected:
+    expected_lines = [l.rstrip() for l in f_expected.readlines()]
+  actual_lines = [
+      _SkipOmitted(line).rstrip() for line in actual_data.splitlines()
+  ]
+
+  if expected_lines == actual_lines:
+    return None
+
+  expected_path = os.path.relpath(expected_path, build_utils.DIR_SOURCE_ROOT)
+
+  diff = difflib.unified_diff(
+      expected_lines,
+      actual_lines,
+      fromfile=os.path.join('before', expected_path),
+      tofile=os.path.join('after', expected_path),
+      n=0,
+      lineterm='',
+  )
+
+  return '\n'.join(diff)
+
+
+def AddCommandLineFlags(parser):
+  group = parser.add_argument_group('Expectations')
+  group.add_argument(
+      '--expected-file',
+      help='Expected contents for the check. If --expected-file-base  is set, '
+      'this is a diff of --actual-file and --expected-file-base.')
+  group.add_argument(
+      '--expected-file-base',
+      help='File to diff against before comparing to --expected-file.')
+  group.add_argument('--actual-file',
+                     help='Path to write actual file (for reference).')
+  group.add_argument('--failure-file',
+                     help='Write to this file if expectations fail.')
+  group.add_argument('--fail-on-expectations',
+                     action="store_true",
+                     help='Fail on expectation mismatches.')
+  group.add_argument('--only-verify-expectations',
+                     action='store_true',
+                     help='Verify the expectation and exit.')
+
+
+def CheckExpectations(actual_data, options, custom_msg=''):
+  if options.actual_file:
+    with build_utils.AtomicOutput(options.actual_file) as f:
+      f.write(actual_data.encode('utf8'))
+  if options.expected_file_base:
+    actual_data = _GenerateDiffWithOnlyAdditons(options.expected_file_base,
+                                                actual_data)
+  diff_text = _DiffFileContents(options.expected_file, actual_data)
+
+  if not diff_text:
+    fail_msg = ''
+  else:
+    fail_msg = """
+Expectations need updating:
+https://chromium.googlesource.com/chromium/src/+/HEAD/chrome/android/expectations/README.md
+
+LogDog tip: Use "Raw log" or "Switch to lite mode" before copying:
+https://bugs.chromium.org/p/chromium/issues/detail?id=984616
+
+{}
+
+To update expectations, run:
+########### START ###########
+ patch -p1 <<'END_DIFF'
+{}
+END_DIFF
+############ END ############
+""".format(custom_msg, diff_text)
+
+    sys.stderr.write(fail_msg)
+
+  if fail_msg and options.fail_on_expectations:
+    # Don't write failure file when failing on expectations or else the target
+    # will not be re-run on subsequent ninja invocations.
+    sys.exit(1)
+
+  if options.failure_file:
+    with open(options.failure_file, 'w') as f:
+      f.write(fail_msg)
diff --git a/third_party/libwebrtc/build/android/gyp/util/jar_info_utils.py b/third_party/libwebrtc/build/android/gyp/util/jar_info_utils.py
new file mode 100644
index 0000000000..975945510e
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/jar_info_utils.py
@@ -0,0 +1,59 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+
+# Utilities to read and write .jar.info files.
+#
+# A .jar.info file contains a simple mapping from fully-qualified Java class
+# names to the source file that actually defines it.
+#
+# For APKs, the .jar.info maps the class names to the .jar file that which
+# contains its .class definition instead.
+
+
+def ReadAarSourceInfo(info_path):
+  """Returns the source= path from an .aar's source.info file."""
+  # The .info looks like: "source=path/to/.aar\n".
+  with open(info_path) as f:
+    return f.read().rstrip().split('=', 1)[1]
+
+
+def ParseJarInfoFile(info_path):
+  """Parse a given .jar.info file as a dictionary.
+
+  Args:
+    info_path: input .jar.info file path.
+  Returns:
+    A new dictionary mapping fully-qualified Java class names to file paths.
+  """
+  info_data = dict()
+  if os.path.exists(info_path):
+    with open(info_path, 'r') as info_file:
+      for line in info_file:
+        line = line.strip()
+        if line:
+          fully_qualified_name, path = line.split(',', 1)
+          info_data[fully_qualified_name] = path
+  return info_data
+
+
+def WriteJarInfoFile(output_obj, info_data, source_file_map=None):
+  """Generate a .jar.info file from a given dictionary.
+
+  Args:
+    output_obj: output file object.
+    info_data: a mapping of fully qualified Java class names to filepaths.
+    source_file_map: an optional mapping from java source file paths to the
+      corresponding source .srcjar. This is because info_data may contain the
+      path of Java source files that where extracted from an .srcjar into a
+      temporary location.
+  """
+  for fully_qualified_name, path in sorted(info_data.items()):
+    if source_file_map and path in source_file_map:
+      path = source_file_map[path]
+      assert not path.startswith('/tmp'), (
+          'Java file path should not be in temp dir: {}'.format(path))
+    output_obj.write(('{},{}\n'.format(fully_qualified_name,
+                                       path)).encode('utf8'))
diff --git a/third_party/libwebrtc/build/android/gyp/util/java_cpp_utils.py b/third_party/libwebrtc/build/android/gyp/util/java_cpp_utils.py
new file mode 100644
index 0000000000..5180400d61
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/java_cpp_utils.py
@@ -0,0 +1,194 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import re
+import sys
+
+
+def GetScriptName():
+  return os.path.basename(os.path.abspath(sys.argv[0]))
+
+
+def GetJavaFilePath(java_package, class_name):
+  package_path = java_package.replace('.', os.path.sep)
+  file_name = class_name + '.java'
+  return os.path.join(package_path, file_name)
+
+
+def KCamelToShouty(s):
+  """Convert |s| from kCamelCase or CamelCase to SHOUTY_CASE.
+
+  kFooBar -> FOO_BAR
+  FooBar -> FOO_BAR
+  FooBAR9 -> FOO_BAR9
+  FooBARBaz -> FOO_BAR_BAZ
+  """
+  if not re.match(r'^k?([A-Z][^A-Z]+|[A-Z0-9]+)+$', s):
+    return s
+  # Strip the leading k.
+  s = re.sub(r'^k', '', s)
+  # Treat "WebView" like one word.
+  s = re.sub(r'WebView', r'Webview', s)
+  # Add _ between title words and anything else.
+  s = re.sub(r'([^_])([A-Z][^A-Z_0-9]+)', r'\1_\2', s)
+  # Add _ between lower -> upper transitions.
+  s = re.sub(r'([^A-Z_0-9])([A-Z])', r'\1_\2', s)
+  return s.upper()
+
+
+class JavaString(object):
+  def __init__(self, name, value, comments):
+    self.name = KCamelToShouty(name)
+    self.value = value
+    self.comments = '\n'.join('    ' + x for x in comments)
+
+  def Format(self):
+    return '%s\n    public static final String %s = %s;' % (
+        self.comments, self.name, self.value)
+
+
+def ParseTemplateFile(lines):
+  package_re = re.compile(r'^package (.*);')
+  class_re = re.compile(r'.*class (.*) {')
+  package = ''
+  class_name = ''
+  for line in lines:
+    package_line = package_re.match(line)
+    if package_line:
+      package = package_line.groups()[0]
+    class_line = class_re.match(line)
+    if class_line:
+      class_name = class_line.groups()[0]
+      break
+  return package, class_name
+
+
+# TODO(crbug.com/937282): Work will be needed if we want to annotate specific
+# constants in the file to be parsed.
+class CppConstantParser(object):
+  """Parses C++ constants, retaining their comments.
+
+  The Delegate subclass is responsible for matching and extracting the
+  constant's variable name and value, as well as generating an object to
+  represent the Java representation of this value.
+  """
+  SINGLE_LINE_COMMENT_RE = re.compile(r'\s*(// [^\n]*)')
+
+  class Delegate(object):
+    def ExtractConstantName(self, line):
+      """Extracts a constant's name from line or None if not a match."""
+      raise NotImplementedError()
+
+    def ExtractValue(self, line):
+      """Extracts a constant's value from line or None if not a match."""
+      raise NotImplementedError()
+
+    def CreateJavaConstant(self, name, value, comments):
+      """Creates an object representing the Java analog of a C++ constant.
+
+      CppConstantParser will not interact with the object created by this
+      method. Instead, it will store this value in a list and return a list of
+      all objects from the Parse() method. In this way, the caller may define
+      whatever class suits their need.
+
+      Args:
+        name: the constant's variable name, as extracted by
+          ExtractConstantName()
+        value: the constant's value, as extracted by ExtractValue()
+        comments: the code comments describing this constant
+      """
+      raise NotImplementedError()
+
+  def __init__(self, delegate, lines):
+    self._delegate = delegate
+    self._lines = lines
+    self._in_variable = False
+    self._in_comment = False
+    self._package = ''
+    self._current_comments = []
+    self._current_name = ''
+    self._current_value = ''
+    self._constants = []
+
+  def _ExtractVariable(self, line):
+    match = StringFileParser.STRING_RE.match(line)
+    return match.group(1) if match else None
+
+  def _ExtractValue(self, line):
+    match = StringFileParser.VALUE_RE.search(line)
+    return match.group(1) if match else None
+
+  def _Reset(self):
+    self._current_comments = []
+    self._current_name = ''
+    self._current_value = ''
+    self._in_variable = False
+    self._in_comment = False
+
+  def _AppendConstant(self):
+    self._constants.append(
+        self._delegate.CreateJavaConstant(self._current_name,
+                                          self._current_value,
+                                          self._current_comments))
+    self._Reset()
+
+  def _ParseValue(self, line):
+    current_value = self._delegate.ExtractValue(line)
+    if current_value is not None:
+      self._current_value = current_value
+      self._AppendConstant()
+    else:
+      self._Reset()
+
+  def _ParseComment(self, line):
+    comment_line = CppConstantParser.SINGLE_LINE_COMMENT_RE.match(line)
+    if comment_line:
+      self._current_comments.append(comment_line.groups()[0])
+      self._in_comment = True
+      self._in_variable = True
+      return True
+    else:
+      self._in_comment = False
+      return False
+
+  def _ParseVariable(self, line):
+    current_name = self._delegate.ExtractConstantName(line)
+    if current_name is not None:
+      self._current_name = current_name
+      current_value = self._delegate.ExtractValue(line)
+      if current_value is not None:
+        self._current_value = current_value
+        self._AppendConstant()
+      else:
+        self._in_variable = True
+      return True
+    else:
+      self._in_variable = False
+      return False
+
+  def _ParseLine(self, line):
+    if not self._in_variable:
+      if not self._ParseVariable(line):
+        self._ParseComment(line)
+      return
+
+    if self._in_comment:
+      if self._ParseComment(line):
+        return
+      if not self._ParseVariable(line):
+        self._Reset()
+      return
+
+    if self._in_variable:
+      self._ParseValue(line)
+
+  def Parse(self):
+    """Returns a list of objects representing C++ constants.
+
+    Each object in the list was created by Delegate.CreateJavaValue().
+    """
+    for line in self._lines:
+      self._ParseLine(line)
+    return self._constants
diff --git a/third_party/libwebrtc/build/android/gyp/util/manifest_utils.py b/third_party/libwebrtc/build/android/gyp/util/manifest_utils.py
new file mode 100644
index 0000000000..a517708b59
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/manifest_utils.py
@@ -0,0 +1,321 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Contains common helpers for working with Android manifests."""
+
+import hashlib
+import os
+import re
+import shlex
+import sys
+import xml.dom.minidom as minidom
+
+from util import build_utils
+from xml.etree import ElementTree
+
+ANDROID_NAMESPACE = 'http://schemas.android.com/apk/res/android'
+TOOLS_NAMESPACE = 'http://schemas.android.com/tools'
+DIST_NAMESPACE = 'http://schemas.android.com/apk/distribution'
+EMPTY_ANDROID_MANIFEST_PATH = os.path.abspath(
+    os.path.join(os.path.dirname(__file__), '..', '..', 'AndroidManifest.xml'))
+# When normalizing for expectation matching, wrap these tags when they are long
+# or else they become very hard to read.
+_WRAP_CANDIDATES = (
+    '<manifest',
+    '<application',
+    '<activity',
+    '<provider',
+    '<receiver',
+    '<service',
+)
+# Don't wrap lines shorter than this.
+_WRAP_LINE_LENGTH = 100
+
+_xml_namespace_initialized = False
+
+
+def _RegisterElementTreeNamespaces():
+  global _xml_namespace_initialized
+  if _xml_namespace_initialized:
+    return
+  _xml_namespace_initialized = True
+  ElementTree.register_namespace('android', ANDROID_NAMESPACE)
+  ElementTree.register_namespace('tools', TOOLS_NAMESPACE)
+  ElementTree.register_namespace('dist', DIST_NAMESPACE)
+
+
+def ParseManifest(path):
+  """Parses an AndroidManifest.xml using ElementTree.
+
+  Registers required namespaces, creates application node if missing, adds any
+  missing namespaces for 'android', 'tools' and 'dist'.
+
+  Returns tuple of:
+    doc: Root xml document.
+    manifest_node: the <manifest> node.
+    app_node: the <application> node.
+  """
+  _RegisterElementTreeNamespaces()
+  doc = ElementTree.parse(path)
+  # ElementTree.find does not work if the required tag is the root.
+  if doc.getroot().tag == 'manifest':
+    manifest_node = doc.getroot()
+  else:
+    manifest_node = doc.find('manifest')
+
+  app_node = doc.find('application')
+  if app_node is None:
+    app_node = ElementTree.SubElement(manifest_node, 'application')
+
+  return doc, manifest_node, app_node
+
+
+def SaveManifest(doc, path):
+  with build_utils.AtomicOutput(path) as f:
+    f.write(ElementTree.tostring(doc.getroot(), encoding='UTF-8'))
+
+
+def GetPackage(manifest_node):
+  return manifest_node.get('package')
+
+
+def AssertUsesSdk(manifest_node,
+                  min_sdk_version=None,
+                  target_sdk_version=None,
+                  max_sdk_version=None,
+                  fail_if_not_exist=False):
+  """Asserts values of attributes of <uses-sdk> element.
+
+  Unless |fail_if_not_exist| is true, will only assert if both the passed value
+  is not None and the value of attribute exist. If |fail_if_not_exist| is true
+  will fail if passed value is not None but attribute does not exist.
+  """
+  uses_sdk_node = manifest_node.find('./uses-sdk')
+  if uses_sdk_node is None:
+    return
+  for prefix, sdk_version in (('min', min_sdk_version), ('target',
+                                                         target_sdk_version),
+                              ('max', max_sdk_version)):
+    value = uses_sdk_node.get('{%s}%sSdkVersion' % (ANDROID_NAMESPACE, prefix))
+    if fail_if_not_exist and not value and sdk_version:
+      assert False, (
+          '%sSdkVersion in Android manifest does not exist but we expect %s' %
+          (prefix, sdk_version))
+    if not value or not sdk_version:
+      continue
+    assert value == sdk_version, (
+        '%sSdkVersion in Android manifest is %s but we expect %s' %
+        (prefix, value, sdk_version))
+
+
+def AssertPackage(manifest_node, package):
+  """Asserts that manifest package has desired value.
+
+  Will only assert if both |package| is not None and the package is set in the
+  manifest.
+  """
+  package_value = GetPackage(manifest_node)
+  if package_value is None or package is None:
+    return
+  assert package_value == package, (
+      'Package in Android manifest is %s but we expect %s' % (package_value,
+                                                              package))
+
+
+def _SortAndStripElementTree(root):
+  # Sort alphabetically with two exceptions:
+  # 1) Put <application> node last (since it's giant).
+  # 2) Put android:name before other attributes.
+  def element_sort_key(node):
+    if node.tag == 'application':
+      return 'z'
+    ret = ElementTree.tostring(node)
+    # ElementTree.tostring inserts namespace attributes for any that are needed
+    # for the node or any of its descendants. Remove them so as to prevent a
+    # change to a child that adds/removes a namespace usage from changing sort
+    # order.
+    return re.sub(r' xmlns:.*?".*?"', '', ret.decode('utf8'))
+
+  name_attr = '{%s}name' % ANDROID_NAMESPACE
+
+  def attribute_sort_key(tup):
+    return ('', '') if tup[0] == name_attr else tup
+
+  def helper(node):
+    for child in node:
+      if child.text and child.text.isspace():
+        child.text = None
+      helper(child)
+
+    # Sort attributes (requires Python 3.8+).
+    node.attrib = dict(sorted(node.attrib.items(), key=attribute_sort_key))
+
+    # Sort nodes
+    node[:] = sorted(node, key=element_sort_key)
+
+  helper(root)
+
+
+def _SplitElement(line):
+  """Parses a one-line xml node into ('<tag', ['a="b"', ...]], '/>')."""
+
+  # Shlex splits nicely, but removes quotes. Need to put them back.
+  def restore_quotes(value):
+    return value.replace('=', '="', 1) + '"'
+
+  # Simplify restore_quotes by separating />.
+  assert line.endswith('>'), line
+  end_tag = '>'
+  if line.endswith('/>'):
+    end_tag = '/>'
+  line = line[:-len(end_tag)]
+
+  # Use shlex to avoid having to re-encode &quot;, etc.
+  parts = shlex.split(line)
+  start_tag = parts[0]
+  attrs = parts[1:]
+
+  return start_tag, [restore_quotes(x) for x in attrs], end_tag
+
+
+def _CreateNodeHash(lines):
+  """Computes a hash (md5) for the first XML node found in |lines|.
+
+  Args:
+    lines: List of strings containing pretty-printed XML.
+
+  Returns:
+    Positive 32-bit integer hash of the node (including children).
+  """
+  target_indent = lines[0].find('<')
+  tag_closed = False
+  for i, l in enumerate(lines[1:]):
+    cur_indent = l.find('<')
+    if cur_indent != -1 and cur_indent <= target_indent:
+      tag_lines = lines[:i + 1]
+      break
+    elif not tag_closed and 'android:name="' in l:
+      # To reduce noise of node tags changing, use android:name as the
+      # basis the hash since they usually unique.
+      tag_lines = [l]
+      break
+    tag_closed = tag_closed or '>' in l
+  else:
+    assert False, 'Did not find end of node:\n' + '\n'.join(lines)
+
+  # Insecure and truncated hash as it only needs to be unique vs. its neighbors.
+  return hashlib.md5(('\n'.join(tag_lines)).encode('utf8')).hexdigest()[:8]
+
+
+def _IsSelfClosing(lines):
+  """Given pretty-printed xml, returns whether first node is self-closing."""
+  for l in lines:
+    idx = l.find('>')
+    if idx != -1:
+      return l[idx - 1] == '/'
+  assert False, 'Did not find end of tag:\n' + '\n'.join(lines)
+
+
+def _AddDiffTags(lines):
+  # When multiple identical tags appear sequentially, XML diffs can look like:
+  # +  </tag>
+  # +  <tag>
+  # rather than:
+  # +  <tag>
+  # +  </tag>
+  # To reduce confusion, add hashes to tags.
+  # This also ensures changed tags show up with outer <tag> elements rather than
+  # showing only changed attributes.
+  hash_stack = []
+  for i, l in enumerate(lines):
+    stripped = l.lstrip()
+    # Ignore non-indented tags and lines that are not the start/end of a node.
+    if l[0] != ' ' or stripped[0] != '<':
+      continue
+    # Ignore self-closing nodes that fit on one line.
+    if l[-2:] == '/>':
+      continue
+    # Ignore <application> since diff tag changes with basically any change.
+    if stripped.lstrip('</').startswith('application'):
+      continue
+
+    # Check for the closing tag (</foo>).
+    if stripped[1] != '/':
+      cur_hash = _CreateNodeHash(lines[i:])
+      if not _IsSelfClosing(lines[i:]):
+        hash_stack.append(cur_hash)
+    else:
+      cur_hash = hash_stack.pop()
+    lines[i] += '  # DIFF-ANCHOR: {}'.format(cur_hash)
+  assert not hash_stack, 'hash_stack was not empty:\n' + '\n'.join(hash_stack)
+
+
+def NormalizeManifest(manifest_contents):
+  _RegisterElementTreeNamespaces()
+  # This also strips comments and sorts node attributes alphabetically.
+  root = ElementTree.fromstring(manifest_contents)
+  package = GetPackage(root)
+
+  app_node = root.find('application')
+  if app_node is not None:
+    # android:debuggable is added when !is_official_build. Strip it out to avoid
+    # expectation diffs caused by not adding is_official_build. Play store
+    # blocks uploading apps with it set, so there's no risk of it slipping in.
+    debuggable_name = '{%s}debuggable' % ANDROID_NAMESPACE
+    if debuggable_name in app_node.attrib:
+      del app_node.attrib[debuggable_name]
+
+    # Trichrome's static library version number is updated daily. To avoid
+    # frequent manifest check failures, we remove the exact version number
+    # during normalization.
+    for node in app_node:
+      if (node.tag in ['uses-static-library', 'static-library']
+          and '{%s}version' % ANDROID_NAMESPACE in node.keys()
+          and '{%s}name' % ANDROID_NAMESPACE in node.keys()):
+        node.set('{%s}version' % ANDROID_NAMESPACE, '$VERSION_NUMBER')
+
+  # We also remove the exact package name (except the one at the root level)
+  # to avoid noise during manifest comparison.
+  def blur_package_name(node):
+    for key in node.keys():
+      node.set(key, node.get(key).replace(package, '$PACKAGE'))
+
+    for child in node:
+      blur_package_name(child)
+
+  # We only blur the package names of non-root nodes because they generate a lot
+  # of diffs when doing manifest checks for upstream targets. We still want to
+  # have 1 piece of package name not blurred just in case the package name is
+  # mistakenly changed.
+  for child in root:
+    blur_package_name(child)
+
+  _SortAndStripElementTree(root)
+
+  # Fix up whitespace/indentation.
+  dom = minidom.parseString(ElementTree.tostring(root))
+  out_lines = []
+  for l in dom.toprettyxml(indent='  ').splitlines():
+    if not l or l.isspace():
+      continue
+    if len(l) > _WRAP_LINE_LENGTH and any(x in l for x in _WRAP_CANDIDATES):
+      indent = ' ' * l.find('<')
+      start_tag, attrs, end_tag = _SplitElement(l)
+      out_lines.append('{}{}'.format(indent, start_tag))
+      for attribute in attrs:
+        out_lines.append('{}    {}'.format(indent, attribute))
+      out_lines[-1] += '>'
+      # Heuristic: Do not allow multi-line tags to be self-closing since these
+      # can generally be allowed to have nested elements. When diffing, it adds
+      # noise if the base file is self-closing and the non-base file is not
+      # self-closing.
+      if end_tag == '/>':
+        out_lines.append('{}{}>'.format(indent, start_tag.replace('<', '</')))
+    else:
+      out_lines.append(l)
+
+  # Make output more diff-friendly.
+  _AddDiffTags(out_lines)
+
+  return '\n'.join(out_lines) + '\n'
diff --git a/third_party/libwebrtc/build/android/gyp/util/manifest_utils_test.py b/third_party/libwebrtc/build/android/gyp/util/manifest_utils_test.py
new file mode 100755
index 0000000000..52bf458a59
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/manifest_utils_test.py
@@ -0,0 +1,128 @@
+#!/usr/bin/env python3
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import collections
+import os
+import sys
+import unittest
+
+sys.path.insert(1, os.path.join(os.path.dirname(__file__), '..'))
+from util import manifest_utils
+
+_TEST_MANIFEST = """\
+<?xml version="1.0" ?>
+<manifest package="test.pkg"
+    tools:ignore="MissingVersion"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+  <!-- Should be one line. -->
+  <uses-sdk android:minSdkVersion="24"
+      android:targetSdkVersion="30"/>
+  <!-- Should have attrs sorted-->
+  <uses-feature android:required="false" android:version="1"
+    android:name="android.hardware.vr.headtracking" />
+  <!-- Should not be wrapped since < 100 chars. -->
+  <application
+      android:name="testname">
+    <activity
+        {extra_activity_attr}
+        android:icon="@drawable/ic_devices_48dp"
+        android:label="label with spaces"
+        android:name="to be hashed"
+        android:theme="@style/Theme.Chromium.Activity.TranslucentNoAnimations">
+      <intent-filter>
+        {extra_intent_filter_elem}
+        <action android:name="android.intent.action.SEND"/>
+        <category android:name="android.intent.category.DEFAULT"/>
+        <data android:mimeType="text/plain"/>
+      </intent-filter>
+    </activity>
+    <!-- Should be made non-self-closing. -->
+    <receiver android:exported="false" android:name="\
+org.chromium.chrome.browser.announcement.AnnouncementNotificationManager$Rcvr"/>
+  </application>
+</manifest>
+"""
+
+_TEST_MANIFEST_NORMALIZED = """\
+<?xml version="1.0" ?>
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="test.pkg"
+    tools:ignore="MissingVersion">
+  <uses-feature android:name="android.hardware.vr.headtracking" \
+android:required="false" android:version="1"/>
+  <uses-sdk android:minSdkVersion="24" android:targetSdkVersion="30"/>
+  <application android:name="testname">
+    <activity  # DIFF-ANCHOR: {activity_diff_anchor}
+        android:name="to be hashed"
+        {extra_activity_attr}android:icon="@drawable/ic_devices_48dp"
+        android:label="label with spaces"
+        android:theme="@style/Theme.Chromium.Activity.TranslucentNoAnimations">
+      <intent-filter>  # DIFF-ANCHOR: {intent_filter_diff_anchor}
+        {extra_intent_filter_elem}\
+<action android:name="android.intent.action.SEND"/>
+        <category android:name="android.intent.category.DEFAULT"/>
+        <data android:mimeType="text/plain"/>
+      </intent-filter>  # DIFF-ANCHOR: {intent_filter_diff_anchor}
+    </activity>  # DIFF-ANCHOR: {activity_diff_anchor}
+    <receiver  # DIFF-ANCHOR: ddab3320
+        android:name=\
+"org.chromium.chrome.browser.announcement.AnnouncementNotificationManager$Rcvr"
+        android:exported="false">
+    </receiver>  # DIFF-ANCHOR: ddab3320
+  </application>
+</manifest>
+"""
+
+_ACTIVITY_DIFF_ANCHOR = '32b3a641'
+_INTENT_FILTER_DIFF_ANCHOR = '4ee601b7'
+
+
+def _CreateTestData(intent_filter_diff_anchor=_INTENT_FILTER_DIFF_ANCHOR,
+                    extra_activity_attr='',
+                    extra_intent_filter_elem=''):
+  if extra_activity_attr:
+    extra_activity_attr += '\n        '
+  if extra_intent_filter_elem:
+    extra_intent_filter_elem += '\n        '
+  test_manifest = _TEST_MANIFEST.format(
+      extra_activity_attr=extra_activity_attr,
+      extra_intent_filter_elem=extra_intent_filter_elem)
+  expected = _TEST_MANIFEST_NORMALIZED.format(
+      activity_diff_anchor=_ACTIVITY_DIFF_ANCHOR,
+      intent_filter_diff_anchor=intent_filter_diff_anchor,
+      extra_activity_attr=extra_activity_attr,
+      extra_intent_filter_elem=extra_intent_filter_elem)
+  return test_manifest, expected
+
+
+class ManifestUtilsTest(unittest.TestCase):
+  # Enable diff output.
+  maxDiff = None
+
+  def testNormalizeManifest_golden(self):
+    test_manifest, expected = _CreateTestData()
+    actual = manifest_utils.NormalizeManifest(test_manifest)
+    self.assertMultiLineEqual(expected, actual)
+
+  def testNormalizeManifest_nameUsedForActivity(self):
+    test_manifest, expected = _CreateTestData(extra_activity_attr='a="b"')
+    actual = manifest_utils.NormalizeManifest(test_manifest)
+    # Checks that the DIFF-ANCHOR does not change with the added attribute.
+    self.assertMultiLineEqual(expected, actual)
+
+  def testNormalizeManifest_nameNotUsedForIntentFilter(self):
+    test_manifest, expected = _CreateTestData(
+        extra_intent_filter_elem='<a/>', intent_filter_diff_anchor='5f5c8a70')
+    actual = manifest_utils.NormalizeManifest(test_manifest)
+    # Checks that the DIFF-ANCHOR does change with the added element despite
+    # having a nested element with an android:name set.
+    self.assertMultiLineEqual(expected, actual)
+
+
+if __name__ == '__main__':
+  unittest.main()
diff --git a/third_party/libwebrtc/build/android/gyp/util/md5_check.py b/third_party/libwebrtc/build/android/gyp/util/md5_check.py
new file mode 100644
index 0000000000..87ee723c85
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/md5_check.py
@@ -0,0 +1,471 @@
+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from __future__ import print_function
+
+import difflib
+import hashlib
+import itertools
+import json
+import os
+import sys
+import zipfile
+
+from util import build_utils
+
+sys.path.insert(1, os.path.join(build_utils.DIR_SOURCE_ROOT, 'build'))
+import print_python_deps
+
+# When set and a difference is detected, a diff of what changed is printed.
+PRINT_EXPLANATIONS = int(os.environ.get('PRINT_BUILD_EXPLANATIONS', 0))
+
+# An escape hatch that causes all targets to be rebuilt.
+_FORCE_REBUILD = int(os.environ.get('FORCE_REBUILD', 0))
+
+
+def CallAndWriteDepfileIfStale(on_stale_md5,
+                               options,
+                               record_path=None,
+                               input_paths=None,
+                               input_strings=None,
+                               output_paths=None,
+                               force=False,
+                               pass_changes=False,
+                               track_subpaths_allowlist=None,
+                               depfile_deps=None):
+  """Wraps CallAndRecordIfStale() and writes a depfile if applicable.
+
+  Depfiles are automatically added to output_paths when present in the |options|
+  argument. They are then created after |on_stale_md5| is called.
+
+  By default, only python dependencies are added to the depfile. If there are
+  other input paths that are not captured by GN deps, then they should be listed
+  in depfile_deps. It's important to write paths to the depfile that are already
+  captured by GN deps since GN args can cause GN deps to change, and such
+  changes are not immediately reflected in depfiles (http://crbug.com/589311).
+  """
+  if not output_paths:
+    raise Exception('At least one output_path must be specified.')
+  input_paths = list(input_paths or [])
+  input_strings = list(input_strings or [])
+  output_paths = list(output_paths or [])
+
+  input_paths += print_python_deps.ComputePythonDependencies()
+
+  CallAndRecordIfStale(
+      on_stale_md5,
+      record_path=record_path,
+      input_paths=input_paths,
+      input_strings=input_strings,
+      output_paths=output_paths,
+      force=force,
+      pass_changes=pass_changes,
+      track_subpaths_allowlist=track_subpaths_allowlist)
+
+  # Write depfile even when inputs have not changed to ensure build correctness
+  # on bots that build with & without patch, and the patch changes the depfile
+  # location.
+  if hasattr(options, 'depfile') and options.depfile:
+    build_utils.WriteDepfile(options.depfile, output_paths[0], depfile_deps)
+
+
+def CallAndRecordIfStale(function,
+                         record_path=None,
+                         input_paths=None,
+                         input_strings=None,
+                         output_paths=None,
+                         force=False,
+                         pass_changes=False,
+                         track_subpaths_allowlist=None):
+  """Calls function if outputs are stale.
+
+  Outputs are considered stale if:
+  - any output_paths are missing, or
+  - the contents of any file within input_paths has changed, or
+  - the contents of input_strings has changed.
+
+  To debug which files are out-of-date, set the environment variable:
+      PRINT_MD5_DIFFS=1
+
+  Args:
+    function: The function to call.
+    record_path: Path to record metadata.
+      Defaults to output_paths[0] + '.md5.stamp'
+    input_paths: List of paths to calcualte an md5 sum on.
+    input_strings: List of strings to record verbatim.
+    output_paths: List of output paths.
+    force: Whether to treat outputs as missing regardless of whether they
+      actually are.
+    pass_changes: Whether to pass a Changes instance to |function|.
+    track_subpaths_allowlist: Relevant only when pass_changes=True. List of .zip
+      files from |input_paths| to make subpath information available for.
+  """
+  assert record_path or output_paths
+  input_paths = input_paths or []
+  input_strings = input_strings or []
+  output_paths = output_paths or []
+  record_path = record_path or output_paths[0] + '.md5.stamp'
+
+  assert record_path.endswith('.stamp'), (
+      'record paths must end in \'.stamp\' so that they are easy to find '
+      'and delete')
+
+  new_metadata = _Metadata(track_entries=pass_changes or PRINT_EXPLANATIONS)
+  new_metadata.AddStrings(input_strings)
+
+  zip_allowlist = set(track_subpaths_allowlist or [])
+  for path in input_paths:
+    # It's faster to md5 an entire zip file than it is to just locate & hash
+    # its central directory (which is what this used to do).
+    if path in zip_allowlist:
+      entries = _ExtractZipEntries(path)
+      new_metadata.AddZipFile(path, entries)
+    else:
+      new_metadata.AddFile(path, _ComputeTagForPath(path))
+
+  old_metadata = None
+  force = force or _FORCE_REBUILD
+  missing_outputs = [x for x in output_paths if force or not os.path.exists(x)]
+  too_new = []
+  # When outputs are missing, don't bother gathering change information.
+  if not missing_outputs and os.path.exists(record_path):
+    record_mtime = os.path.getmtime(record_path)
+    # Outputs newer than the change information must have been modified outside
+    # of the build, and should be considered stale.
+    too_new = [x for x in output_paths if os.path.getmtime(x) > record_mtime]
+    if not too_new:
+      with open(record_path, 'r') as jsonfile:
+        try:
+          old_metadata = _Metadata.FromFile(jsonfile)
+        except:  # pylint: disable=bare-except
+          pass  # Not yet using new file format.
+
+  changes = Changes(old_metadata, new_metadata, force, missing_outputs, too_new)
+  if not changes.HasChanges():
+    return
+
+  if PRINT_EXPLANATIONS:
+    print('=' * 80)
+    print('Target is stale: %s' % record_path)
+    print(changes.DescribeDifference())
+    print('=' * 80)
+
+  args = (changes,) if pass_changes else ()
+  function(*args)
+
+  with open(record_path, 'w') as f:
+    new_metadata.ToFile(f)
+
+
+class Changes(object):
+  """Provides and API for querying what changed between runs."""
+
+  def __init__(self, old_metadata, new_metadata, force, missing_outputs,
+               too_new):
+    self.old_metadata = old_metadata
+    self.new_metadata = new_metadata
+    self.force = force
+    self.missing_outputs = missing_outputs
+    self.too_new = too_new
+
+  def _GetOldTag(self, path, subpath=None):
+    return self.old_metadata and self.old_metadata.GetTag(path, subpath)
+
+  def HasChanges(self):
+    """Returns whether any changes exist."""
+    return (self.HasStringChanges()
+            or self.old_metadata.FilesMd5() != self.new_metadata.FilesMd5())
+
+  def HasStringChanges(self):
+    """Returns whether string metadata changed."""
+    return (self.force or not self.old_metadata
+            or self.old_metadata.StringsMd5() != self.new_metadata.StringsMd5())
+
+  def AddedOrModifiedOnly(self):
+    """Returns whether the only changes were from added or modified (sub)files.
+
+    No missing outputs, no removed paths/subpaths.
+    """
+    if self.HasStringChanges():
+      return False
+    if any(self.IterRemovedPaths()):
+      return False
+    for path in self.IterModifiedPaths():
+      if any(self.IterRemovedSubpaths(path)):
+        return False
+    return True
+
+  def IterAllPaths(self):
+    """Generator for paths."""
+    return self.new_metadata.IterPaths();
+
+  def IterAllSubpaths(self, path):
+    """Generator for subpaths."""
+    return self.new_metadata.IterSubpaths(path);
+
+  def IterAddedPaths(self):
+    """Generator for paths that were added."""
+    for path in self.new_metadata.IterPaths():
+      if self._GetOldTag(path) is None:
+        yield path
+
+  def IterAddedSubpaths(self, path):
+    """Generator for paths that were added within the given zip file."""
+    for subpath in self.new_metadata.IterSubpaths(path):
+      if self._GetOldTag(path, subpath) is None:
+        yield subpath
+
+  def IterRemovedPaths(self):
+    """Generator for paths that were removed."""
+    if self.old_metadata:
+      for path in self.old_metadata.IterPaths():
+        if self.new_metadata.GetTag(path) is None:
+          yield path
+
+  def IterRemovedSubpaths(self, path):
+    """Generator for paths that were removed within the given zip file."""
+    if self.old_metadata:
+      for subpath in self.old_metadata.IterSubpaths(path):
+        if self.new_metadata.GetTag(path, subpath) is None:
+          yield subpath
+
+  def IterModifiedPaths(self):
+    """Generator for paths whose contents have changed."""
+    for path in self.new_metadata.IterPaths():
+      old_tag = self._GetOldTag(path)
+      new_tag = self.new_metadata.GetTag(path)
+      if old_tag is not None and old_tag != new_tag:
+        yield path
+
+  def IterModifiedSubpaths(self, path):
+    """Generator for paths within a zip file whose contents have changed."""
+    for subpath in self.new_metadata.IterSubpaths(path):
+      old_tag = self._GetOldTag(path, subpath)
+      new_tag = self.new_metadata.GetTag(path, subpath)
+      if old_tag is not None and old_tag != new_tag:
+        yield subpath
+
+  def IterChangedPaths(self):
+    """Generator for all changed paths (added/removed/modified)."""
+    return itertools.chain(self.IterRemovedPaths(),
+                           self.IterModifiedPaths(),
+                           self.IterAddedPaths())
+
+  def IterChangedSubpaths(self, path):
+    """Generator for paths within a zip that were added/removed/modified."""
+    return itertools.chain(self.IterRemovedSubpaths(path),
+                           self.IterModifiedSubpaths(path),
+                           self.IterAddedSubpaths(path))
+
+  def DescribeDifference(self):
+    """Returns a human-readable description of what changed."""
+    if self.force:
+      return 'force=True'
+    elif self.missing_outputs:
+      return 'Outputs do not exist:\n  ' + '\n  '.join(self.missing_outputs)
+    elif self.too_new:
+      return 'Outputs newer than stamp file:\n  ' + '\n  '.join(self.too_new)
+    elif self.old_metadata is None:
+      return 'Previous stamp file not found.'
+
+    if self.old_metadata.StringsMd5() != self.new_metadata.StringsMd5():
+      ndiff = difflib.ndiff(self.old_metadata.GetStrings(),
+                            self.new_metadata.GetStrings())
+      changed = [s for s in ndiff if not s.startswith(' ')]
+      return 'Input strings changed:\n  ' + '\n  '.join(changed)
+
+    if self.old_metadata.FilesMd5() == self.new_metadata.FilesMd5():
+      return "There's no difference."
+
+    lines = []
+    lines.extend('Added: ' + p for p in self.IterAddedPaths())
+    lines.extend('Removed: ' + p for p in self.IterRemovedPaths())
+    for path in self.IterModifiedPaths():
+      lines.append('Modified: ' + path)
+      lines.extend('  -> Subpath added: ' + p
+                   for p in self.IterAddedSubpaths(path))
+      lines.extend('  -> Subpath removed: ' + p
+                   for p in self.IterRemovedSubpaths(path))
+      lines.extend('  -> Subpath modified: ' + p
+                   for p in self.IterModifiedSubpaths(path))
+    if lines:
+      return 'Input files changed:\n  ' + '\n  '.join(lines)
+    return 'I have no idea what changed (there is a bug).'
+
+
+class _Metadata(object):
+  """Data model for tracking change metadata.
+
+  Args:
+    track_entries: Enables per-file change tracking. Slower, but required for
+        Changes functionality.
+  """
+  # Schema:
+  # {
+  #   "files-md5": "VALUE",
+  #   "strings-md5": "VALUE",
+  #   "input-files": [
+  #     {
+  #       "path": "path.jar",
+  #       "tag": "{MD5 of entries}",
+  #       "entries": [
+  #         { "path": "org/chromium/base/Foo.class", "tag": "{CRC32}" }, ...
+  #       ]
+  #     }, {
+  #       "path": "path.txt",
+  #       "tag": "{MD5}",
+  #     }
+  #   ],
+  #   "input-strings": ["a", "b", ...],
+  # }
+  def __init__(self, track_entries=False):
+    self._track_entries = track_entries
+    self._files_md5 = None
+    self._strings_md5 = None
+    self._files = []
+    self._strings = []
+    # Map of (path, subpath) -> entry. Created upon first call to _GetEntry().
+    self._file_map = None
+
+  @classmethod
+  def FromFile(cls, fileobj):
+    """Returns a _Metadata initialized from a file object."""
+    ret = cls()
+    obj = json.load(fileobj)
+    ret._files_md5 = obj['files-md5']
+    ret._strings_md5 = obj['strings-md5']
+    ret._files = obj.get('input-files', [])
+    ret._strings = obj.get('input-strings', [])
+    return ret
+
+  def ToFile(self, fileobj):
+    """Serializes metadata to the given file object."""
+    obj = {
+        'files-md5': self.FilesMd5(),
+        'strings-md5': self.StringsMd5(),
+    }
+    if self._track_entries:
+      obj['input-files'] = sorted(self._files, key=lambda e: e['path'])
+      obj['input-strings'] = self._strings
+
+    json.dump(obj, fileobj, indent=2)
+
+  def _AssertNotQueried(self):
+    assert self._files_md5 is None
+    assert self._strings_md5 is None
+    assert self._file_map is None
+
+  def AddStrings(self, values):
+    self._AssertNotQueried()
+    self._strings.extend(str(v) for v in values)
+
+  def AddFile(self, path, tag):
+    """Adds metadata for a non-zip file.
+
+    Args:
+      path: Path to the file.
+      tag: A short string representative of the file contents.
+    """
+    self._AssertNotQueried()
+    self._files.append({
+        'path': path,
+        'tag': tag,
+    })
+
+  def AddZipFile(self, path, entries):
+    """Adds metadata for a zip file.
+
+    Args:
+      path: Path to the file.
+      entries: List of (subpath, tag) tuples for entries within the zip.
+    """
+    self._AssertNotQueried()
+    tag = _ComputeInlineMd5(itertools.chain((e[0] for e in entries),
+                                            (e[1] for e in entries)))
+    self._files.append({
+        'path': path,
+        'tag': tag,
+        'entries': [{"path": e[0], "tag": e[1]} for e in entries],
+    })
+
+  def GetStrings(self):
+    """Returns the list of input strings."""
+    return self._strings
+
+  def FilesMd5(self):
+    """Lazily computes and returns the aggregate md5 of input files."""
+    if self._files_md5 is None:
+      # Omit paths from md5 since temporary files have random names.
+      self._files_md5 = _ComputeInlineMd5(
+          self.GetTag(p) for p in sorted(self.IterPaths()))
+    return self._files_md5
+
+  def StringsMd5(self):
+    """Lazily computes and returns the aggregate md5 of input strings."""
+    if self._strings_md5 is None:
+      self._strings_md5 = _ComputeInlineMd5(self._strings)
+    return self._strings_md5
+
+  def _GetEntry(self, path, subpath=None):
+    """Returns the JSON entry for the given path / subpath."""
+    if self._file_map is None:
+      self._file_map = {}
+      for entry in self._files:
+        self._file_map[(entry['path'], None)] = entry
+        for subentry in entry.get('entries', ()):
+          self._file_map[(entry['path'], subentry['path'])] = subentry
+    return self._file_map.get((path, subpath))
+
+  def GetTag(self, path, subpath=None):
+    """Returns the tag for the given path / subpath."""
+    ret = self._GetEntry(path, subpath)
+    return ret and ret['tag']
+
+  def IterPaths(self):
+    """Returns a generator for all top-level paths."""
+    return (e['path'] for e in self._files)
+
+  def IterSubpaths(self, path):
+    """Returns a generator for all subpaths in the given zip.
+
+    If the given path is not a zip file or doesn't exist, returns an empty
+    iterable.
+    """
+    outer_entry = self._GetEntry(path)
+    if not outer_entry:
+      return ()
+    subentries = outer_entry.get('entries', [])
+    return (entry['path'] for entry in subentries)
+
+
+def _ComputeTagForPath(path):
+  stat = os.stat(path)
+  if stat.st_size > 1 * 1024 * 1024:
+    # Fallback to mtime for large files so that md5_check does not take too long
+    # to run.
+    return stat.st_mtime
+  md5 = hashlib.md5()
+  with open(path, 'rb') as f:
+    md5.update(f.read())
+  return md5.hexdigest()
+
+
+def _ComputeInlineMd5(iterable):
+  """Computes the md5 of the concatenated parameters."""
+  md5 = hashlib.md5()
+  for item in iterable:
+    md5.update(str(item).encode('ascii'))
+  return md5.hexdigest()
+
+
+def _ExtractZipEntries(path):
+  """Returns a list of (path, CRC32) of all files within |path|."""
+  entries = []
+  with zipfile.ZipFile(path) as zip_file:
+    for zip_info in zip_file.infolist():
+      # Skip directories and empty files.
+      if zip_info.CRC:
+        entries.append(
+            (zip_info.filename, zip_info.CRC + zip_info.compress_type))
+  return entries
diff --git a/third_party/libwebrtc/build/android/gyp/util/md5_check_test.py b/third_party/libwebrtc/build/android/gyp/util/md5_check_test.py
new file mode 100755
index 0000000000..e11bbd50ed
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/md5_check_test.py
@@ -0,0 +1,178 @@
+#!/usr/bin/env python3
+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import fnmatch
+import os
+import sys
+import tempfile
+import unittest
+import zipfile
+
+sys.path.insert(
+    0, os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir)))
+from util import md5_check
+
+
+def _WriteZipFile(path, entries):
+  with zipfile.ZipFile(path, 'w') as zip_file:
+    for subpath, data in entries:
+      zip_file.writestr(subpath, data)
+
+
+class TestMd5Check(unittest.TestCase):
+  def setUp(self):
+    self.called = False
+    self.changes = None
+
+  def testCallAndRecordIfStale(self):
+    input_strings = ['string1', 'string2']
+    input_file1 = tempfile.NamedTemporaryFile(suffix='.txt')
+    input_file2 = tempfile.NamedTemporaryFile(suffix='.zip')
+    file1_contents = b'input file 1'
+    input_file1.write(file1_contents)
+    input_file1.flush()
+    # Test out empty zip file to start.
+    _WriteZipFile(input_file2.name, [])
+    input_files = [input_file1.name, input_file2.name]
+    zip_paths = [input_file2.name]
+
+    record_path = tempfile.NamedTemporaryFile(suffix='.stamp')
+
+    def CheckCallAndRecord(should_call,
+                           message,
+                           force=False,
+                           outputs_specified=False,
+                           outputs_missing=False,
+                           expected_changes=None,
+                           added_or_modified_only=None,
+                           track_subentries=False,
+                           output_newer_than_record=False):
+      output_paths = None
+      if outputs_specified:
+        output_file1 = tempfile.NamedTemporaryFile()
+        if outputs_missing:
+          output_file1.close()  # Gets deleted on close().
+        output_paths = [output_file1.name]
+      if output_newer_than_record:
+        output_mtime = os.path.getmtime(output_file1.name)
+        os.utime(record_path.name, (output_mtime - 1, output_mtime - 1))
+      else:
+        # touch the record file so it doesn't look like it's older that
+        # the output we've just created
+        os.utime(record_path.name, None)
+
+      self.called = False
+      self.changes = None
+      if expected_changes or added_or_modified_only is not None:
+        def MarkCalled(changes):
+          self.called = True
+          self.changes = changes
+      else:
+        def MarkCalled():
+          self.called = True
+
+      md5_check.CallAndRecordIfStale(
+          MarkCalled,
+          record_path=record_path.name,
+          input_paths=input_files,
+          input_strings=input_strings,
+          output_paths=output_paths,
+          force=force,
+          pass_changes=(expected_changes or added_or_modified_only) is not None,
+          track_subpaths_allowlist=zip_paths if track_subentries else None)
+      self.assertEqual(should_call, self.called, message)
+      if expected_changes:
+        description = self.changes.DescribeDifference()
+        self.assertTrue(fnmatch.fnmatch(description, expected_changes),
+                        'Expected %s to match %s' % (
+                        repr(description), repr(expected_changes)))
+      if should_call and added_or_modified_only is not None:
+        self.assertEqual(added_or_modified_only,
+                         self.changes.AddedOrModifiedOnly())
+
+    CheckCallAndRecord(True, 'should call when record doesn\'t exist',
+                       expected_changes='Previous stamp file not found.',
+                       added_or_modified_only=False)
+    CheckCallAndRecord(False, 'should not call when nothing changed')
+    input_files = input_files[::-1]
+    CheckCallAndRecord(False, 'reordering of inputs shouldn\'t trigger call')
+
+    CheckCallAndRecord(False, 'should not call when nothing changed #2',
+                       outputs_specified=True, outputs_missing=False)
+    CheckCallAndRecord(True, 'should call when output missing',
+                       outputs_specified=True, outputs_missing=True,
+                       expected_changes='Outputs do not exist:*',
+                       added_or_modified_only=False)
+    CheckCallAndRecord(True,
+                       'should call when output is newer than record',
+                       expected_changes='Outputs newer than stamp file:*',
+                       outputs_specified=True,
+                       outputs_missing=False,
+                       added_or_modified_only=False,
+                       output_newer_than_record=True)
+    CheckCallAndRecord(True, force=True, message='should call when forced',
+                       expected_changes='force=True',
+                       added_or_modified_only=False)
+
+    input_file1.write(b'some more input')
+    input_file1.flush()
+    CheckCallAndRecord(True, 'changed input file should trigger call',
+                       expected_changes='*Modified: %s' % input_file1.name,
+                       added_or_modified_only=True)
+
+    input_files = input_files[:1]
+    CheckCallAndRecord(True, 'removing file should trigger call',
+                       expected_changes='*Removed: %s' % input_file1.name,
+                       added_or_modified_only=False)
+
+    input_files.append(input_file1.name)
+    CheckCallAndRecord(True, 'added input file should trigger call',
+                       expected_changes='*Added: %s' % input_file1.name,
+                       added_or_modified_only=True)
+
+    input_strings[0] = input_strings[0] + ' a bit longer'
+    CheckCallAndRecord(True, 'changed input string should trigger call',
+                       expected_changes='*Input strings changed*',
+                       added_or_modified_only=False)
+
+    input_strings = input_strings[::-1]
+    CheckCallAndRecord(True, 'reordering of string inputs should trigger call',
+                       expected_changes='*Input strings changed*')
+
+    input_strings = input_strings[:1]
+    CheckCallAndRecord(True, 'removing a string should trigger call')
+
+    input_strings.append('a brand new string')
+    CheckCallAndRecord(
+        True,
+        'added input string should trigger call',
+        added_or_modified_only=False)
+
+    _WriteZipFile(input_file2.name, [('path/1.txt', '1')])
+    CheckCallAndRecord(
+        True,
+        'added subpath should trigger call',
+        expected_changes='*Modified: %s*Subpath added: %s' % (input_file2.name,
+                                                              'path/1.txt'),
+        added_or_modified_only=True,
+        track_subentries=True)
+    _WriteZipFile(input_file2.name, [('path/1.txt', '2')])
+    CheckCallAndRecord(
+        True,
+        'changed subpath should trigger call',
+        expected_changes='*Modified: %s*Subpath modified: %s' %
+        (input_file2.name, 'path/1.txt'),
+        added_or_modified_only=True,
+        track_subentries=True)
+
+    _WriteZipFile(input_file2.name, [])
+    CheckCallAndRecord(True, 'removed subpath should trigger call',
+                       expected_changes='*Modified: %s*Subpath removed: %s' % (
+                                        input_file2.name, 'path/1.txt'),
+                       added_or_modified_only=False)
+
+
+if __name__ == '__main__':
+  unittest.main()
diff --git a/third_party/libwebrtc/build/android/gyp/util/parallel.py b/third_party/libwebrtc/build/android/gyp/util/parallel.py
new file mode 100644
index 0000000000..c26875a71c
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/parallel.py
@@ -0,0 +1,214 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+"""Helpers related to multiprocessing.
+
+Based on: //tools/binary_size/libsupersize/parallel.py
+"""
+
+import atexit
+import logging
+import multiprocessing
+import os
+import sys
+import threading
+import traceback
+
+DISABLE_ASYNC = os.environ.get('DISABLE_ASYNC') == '1'
+if DISABLE_ASYNC:
+  logging.warning('Running in synchronous mode.')
+
+_all_pools = None
+_is_child_process = False
+_silence_exceptions = False
+
+# Used to pass parameters to forked processes without pickling.
+_fork_params = None
+_fork_kwargs = None
+
+
+class _ImmediateResult(object):
+  def __init__(self, value):
+    self._value = value
+
+  def get(self):
+    return self._value
+
+  def wait(self):
+    pass
+
+  def ready(self):
+    return True
+
+  def successful(self):
+    return True
+
+
+class _ExceptionWrapper(object):
+  """Used to marshal exception messages back to main process."""
+
+  def __init__(self, msg, exception_type=None):
+    self.msg = msg
+    self.exception_type = exception_type
+
+  def MaybeThrow(self):
+    if self.exception_type:
+      raise getattr(__builtins__,
+                    self.exception_type)('Originally caused by: ' + self.msg)
+
+
+class _FuncWrapper(object):
+  """Runs on the fork()'ed side to catch exceptions and spread *args."""
+
+  def __init__(self, func):
+    global _is_child_process
+    _is_child_process = True
+    self._func = func
+
+  def __call__(self, index, _=None):
+    try:
+      return self._func(*_fork_params[index], **_fork_kwargs)
+    except Exception as e:
+      # Only keep the exception type for builtin exception types or else risk
+      # further marshalling exceptions.
+      exception_type = None
+      if hasattr(__builtins__, type(e).__name__):
+        exception_type = type(e).__name__
+      # multiprocessing is supposed to catch and return exceptions automatically
+      # but it doesn't seem to work properly :(.
+      return _ExceptionWrapper(traceback.format_exc(), exception_type)
+    except:  # pylint: disable=bare-except
+      return _ExceptionWrapper(traceback.format_exc())
+
+
+class _WrappedResult(object):
+  """Allows for host-side logic to be run after child process has terminated.
+
+  * Unregisters associated pool _all_pools.
+  * Raises exception caught by _FuncWrapper.
+  """
+
+  def __init__(self, result, pool=None):
+    self._result = result
+    self._pool = pool
+
+  def get(self):
+    self.wait()
+    value = self._result.get()
+    _CheckForException(value)
+    return value
+
+  def wait(self):
+    self._result.wait()
+    if self._pool:
+      _all_pools.remove(self._pool)
+      self._pool = None
+
+  def ready(self):
+    return self._result.ready()
+
+  def successful(self):
+    return self._result.successful()
+
+
+def _TerminatePools():
+  """Calls .terminate() on all active process pools.
+
+  Not supposed to be necessary according to the docs, but seems to be required
+  when child process throws an exception or Ctrl-C is hit.
+  """
+  global _silence_exceptions
+  _silence_exceptions = True
+  # Child processes cannot have pools, but atexit runs this function because
+  # it was registered before fork()ing.
+  if _is_child_process:
+    return
+
+  def close_pool(pool):
+    try:
+      pool.terminate()
+    except:  # pylint: disable=bare-except
+      pass
+
+  for i, pool in enumerate(_all_pools):
+    # Without calling terminate() on a separate thread, the call can block
+    # forever.
+    thread = threading.Thread(name='Pool-Terminate-{}'.format(i),
+                              target=close_pool,
+                              args=(pool, ))
+    thread.daemon = True
+    thread.start()
+
+
+def _CheckForException(value):
+  if isinstance(value, _ExceptionWrapper):
+    global _silence_exceptions
+    if not _silence_exceptions:
+      value.MaybeThrow()
+      _silence_exceptions = True
+      logging.error('Subprocess raised an exception:\n%s', value.msg)
+    sys.exit(1)
+
+
+def _MakeProcessPool(job_params, **job_kwargs):
+  global _all_pools
+  global _fork_params
+  global _fork_kwargs
+  assert _fork_params is None
+  assert _fork_kwargs is None
+  pool_size = min(len(job_params), multiprocessing.cpu_count())
+  _fork_params = job_params
+  _fork_kwargs = job_kwargs
+  ret = multiprocessing.Pool(pool_size)
+  _fork_params = None
+  _fork_kwargs = None
+  if _all_pools is None:
+    _all_pools = []
+    atexit.register(_TerminatePools)
+  _all_pools.append(ret)
+  return ret
+
+
+def ForkAndCall(func, args):
+  """Runs |func| in a fork'ed process.
+
+  Returns:
+    A Result object (call .get() to get the return value)
+  """
+  if DISABLE_ASYNC:
+    pool = None
+    result = _ImmediateResult(func(*args))
+  else:
+    pool = _MakeProcessPool([args])  # Omit |kwargs|.
+    result = pool.apply_async(_FuncWrapper(func), (0, ))
+    pool.close()
+  return _WrappedResult(result, pool=pool)
+
+
+def BulkForkAndCall(func, arg_tuples, **kwargs):
+  """Calls |func| in a fork'ed process for each set of args within |arg_tuples|.
+
+  Args:
+    kwargs: Common keyword arguments to be passed to |func|.
+
+  Yields the return values in order.
+  """
+  arg_tuples = list(arg_tuples)
+  if not arg_tuples:
+    return
+
+  if DISABLE_ASYNC:
+    for args in arg_tuples:
+      yield func(*args, **kwargs)
+    return
+
+  pool = _MakeProcessPool(arg_tuples, **kwargs)
+  wrapped_func = _FuncWrapper(func)
+  try:
+    for result in pool.imap(wrapped_func, range(len(arg_tuples))):
+      _CheckForException(result)
+      yield result
+  finally:
+    pool.close()
+    pool.join()
+    _all_pools.remove(pool)
diff --git a/third_party/libwebrtc/build/android/gyp/util/protoresources.py b/third_party/libwebrtc/build/android/gyp/util/protoresources.py
new file mode 100644
index 0000000000..272574f117
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/protoresources.py
@@ -0,0 +1,308 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+"""Functions that modify resources in protobuf format.
+
+Format reference:
+https://cs.android.com/android/platform/superproject/+/master:frameworks/base/tools/aapt2/Resources.proto
+"""
+
+import logging
+import os
+import struct
+import sys
+import zipfile
+
+from util import build_utils
+from util import resource_utils
+
+sys.path[1:1] = [
+    # `Resources_pb2` module imports `descriptor`, which imports `six`.
+    os.path.join(build_utils.DIR_SOURCE_ROOT, 'third_party', 'six', 'src'),
+    # Make sure the pb2 files are able to import google.protobuf
+    os.path.join(build_utils.DIR_SOURCE_ROOT, 'third_party', 'protobuf',
+                 'python'),
+]
+
+from proto import Resources_pb2
+
+# First bytes in an .flat.arsc file.
+# uint32: Magic ("ARSC"), version (1), num_entries (1), type (0)
+_FLAT_ARSC_HEADER = b'AAPT\x01\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00'
+
+# The package ID hardcoded for shared libraries. See
+# _HardcodeSharedLibraryDynamicAttributes() for more details. If this value
+# changes make sure to change REQUIRED_PACKAGE_IDENTIFIER in WebLayerImpl.java.
+SHARED_LIBRARY_HARDCODED_ID = 36
+
+
+def _ProcessZip(zip_path, process_func):
+  """Filters a .zip file via: new_bytes = process_func(filename, data)."""
+  has_changes = False
+  zip_entries = []
+  with zipfile.ZipFile(zip_path) as src_zip:
+    for info in src_zip.infolist():
+      data = src_zip.read(info)
+      new_data = process_func(info.filename, data)
+      if new_data is not data:
+        has_changes = True
+        data = new_data
+      zip_entries.append((info, data))
+
+  # Overwrite the original zip file.
+  if has_changes:
+    with zipfile.ZipFile(zip_path, 'w') as f:
+      for info, data in zip_entries:
+        f.writestr(info, data)
+
+
+def _ProcessProtoItem(item):
+  if not item.HasField('ref'):
+    return
+
+  # If this is a dynamic attribute (type ATTRIBUTE, package ID 0), hardcode
+  # the package to SHARED_LIBRARY_HARDCODED_ID.
+  if item.ref.type == Resources_pb2.Reference.ATTRIBUTE and not (item.ref.id
+                                                                 & 0xff000000):
+    item.ref.id |= (0x01000000 * SHARED_LIBRARY_HARDCODED_ID)
+    item.ref.ClearField('is_dynamic')
+
+
+def _ProcessProtoValue(value):
+  if value.HasField('item'):
+    _ProcessProtoItem(value.item)
+    return
+
+  compound_value = value.compound_value
+  if compound_value.HasField('style'):
+    for entry in compound_value.style.entry:
+      _ProcessProtoItem(entry.item)
+  elif compound_value.HasField('array'):
+    for element in compound_value.array.element:
+      _ProcessProtoItem(element.item)
+  elif compound_value.HasField('plural'):
+    for entry in compound_value.plural.entry:
+      _ProcessProtoItem(entry.item)
+
+
+def _ProcessProtoXmlNode(xml_node):
+  if not xml_node.HasField('element'):
+    return
+
+  for attribute in xml_node.element.attribute:
+    _ProcessProtoItem(attribute.compiled_item)
+
+  for child in xml_node.element.child:
+    _ProcessProtoXmlNode(child)
+
+
+def _SplitLocaleResourceType(_type, allowed_resource_names):
+  """Splits locale specific resources out of |_type| and returns them.
+
+  Any locale specific resources will be removed from |_type|, and a new
+  Resources_pb2.Type value will be returned which contains those resources.
+
+  Args:
+    _type: A Resources_pb2.Type value
+    allowed_resource_names: Names of locale resources that should be kept in the
+        main type.
+  """
+  locale_entries = []
+  for entry in _type.entry:
+    if entry.name in allowed_resource_names:
+      continue
+
+    # First collect all resources values with a locale set.
+    config_values_with_locale = []
+    for config_value in entry.config_value:
+      if config_value.config.locale:
+        config_values_with_locale.append(config_value)
+
+    if config_values_with_locale:
+      # Remove the locale resources from the original entry
+      for value in config_values_with_locale:
+        entry.config_value.remove(value)
+
+      # Add locale resources to a new Entry, and save for later.
+      locale_entry = Resources_pb2.Entry()
+      locale_entry.CopyFrom(entry)
+      del locale_entry.config_value[:]
+      locale_entry.config_value.extend(config_values_with_locale)
+      locale_entries.append(locale_entry)
+
+  if not locale_entries:
+    return None
+
+  # Copy the original type and replace the entries with |locale_entries|.
+  locale_type = Resources_pb2.Type()
+  locale_type.CopyFrom(_type)
+  del locale_type.entry[:]
+  locale_type.entry.extend(locale_entries)
+  return locale_type
+
+
+def _HardcodeInTable(table, is_bundle_module, shared_resources_allowlist):
+  translations_package = None
+  if is_bundle_module:
+    # A separate top level package will be added to the resources, which
+    # contains only locale specific resources. The package ID of the locale
+    # resources is hardcoded to SHARED_LIBRARY_HARDCODED_ID. This causes
+    # resources in locale splits to all get assigned
+    # SHARED_LIBRARY_HARDCODED_ID as their package ID, which prevents a bug
+    # in shared library bundles where each split APK gets a separate dynamic
+    # ID, and cannot be accessed by the main APK.
+    translations_package = Resources_pb2.Package()
+    translations_package.package_id.id = SHARED_LIBRARY_HARDCODED_ID
+    translations_package.package_name = (table.package[0].package_name +
+                                         '_translations')
+
+    # These resources are allowed in the base resources, since they are needed
+    # by WebView.
+    allowed_resource_names = set()
+    if shared_resources_allowlist:
+      allowed_resource_names = set(
+          resource_utils.GetRTxtStringResourceNames(shared_resources_allowlist))
+
+  for package in table.package:
+    for _type in package.type:
+      for entry in _type.entry:
+        for config_value in entry.config_value:
+          _ProcessProtoValue(config_value.value)
+
+      if translations_package is not None:
+        locale_type = _SplitLocaleResourceType(_type, allowed_resource_names)
+        if locale_type:
+          translations_package.type.add().CopyFrom(locale_type)
+
+  if translations_package is not None:
+    table.package.add().CopyFrom(translations_package)
+
+
+def HardcodeSharedLibraryDynamicAttributes(zip_path,
+                                           is_bundle_module,
+                                           shared_resources_allowlist=None):
+  """Hardcodes the package IDs of dynamic attributes and locale resources.
+
+  Hardcoding dynamic attribute package IDs is a workaround for b/147674078,
+  which affects Android versions pre-N. Hardcoding locale resource package IDs
+  is a workaround for b/155437035, which affects resources built with
+  --shared-lib on all Android versions
+
+  Args:
+    zip_path: Path to proto APK file.
+    is_bundle_module: True for bundle modules.
+    shared_resources_allowlist: Set of resource names to not extract out of the
+        main package.
+  """
+
+  def process_func(filename, data):
+    if filename == 'resources.pb':
+      table = Resources_pb2.ResourceTable()
+      table.ParseFromString(data)
+      _HardcodeInTable(table, is_bundle_module, shared_resources_allowlist)
+      data = table.SerializeToString()
+    elif filename.endswith('.xml') and not filename.startswith('res/raw'):
+      xml_node = Resources_pb2.XmlNode()
+      xml_node.ParseFromString(data)
+      _ProcessProtoXmlNode(xml_node)
+      data = xml_node.SerializeToString()
+    return data
+
+  _ProcessZip(zip_path, process_func)
+
+
+class _ResourceStripper(object):
+  def __init__(self, partial_path, keep_predicate):
+    self.partial_path = partial_path
+    self.keep_predicate = keep_predicate
+    self._has_changes = False
+
+  @staticmethod
+  def _IterStyles(entry):
+    for config_value in entry.config_value:
+      value = config_value.value
+      if value.HasField('compound_value'):
+        compound_value = value.compound_value
+        if compound_value.HasField('style'):
+          yield compound_value.style
+
+  def _StripStyles(self, entry, type_and_name):
+    # Strip style entries that refer to attributes that have been stripped.
+    for style in self._IterStyles(entry):
+      entries = style.entry
+      new_entries = []
+      for entry in entries:
+        full_name = '{}/{}'.format(type_and_name, entry.key.name)
+        if not self.keep_predicate(full_name):
+          logging.debug('Stripped %s/%s', self.partial_path, full_name)
+        else:
+          new_entries.append(entry)
+
+      if len(new_entries) != len(entries):
+        self._has_changes = True
+        del entries[:]
+        entries.extend(new_entries)
+
+  def _StripEntries(self, entries, type_name):
+    new_entries = []
+    for entry in entries:
+      type_and_name = '{}/{}'.format(type_name, entry.name)
+      if not self.keep_predicate(type_and_name):
+        logging.debug('Stripped %s/%s', self.partial_path, type_and_name)
+      else:
+        new_entries.append(entry)
+        self._StripStyles(entry, type_and_name)
+
+    if len(new_entries) != len(entries):
+      self._has_changes = True
+      del entries[:]
+      entries.extend(new_entries)
+
+  def StripTable(self, table):
+    self._has_changes = False
+    for package in table.package:
+      for _type in package.type:
+        self._StripEntries(_type.entry, _type.name)
+    return self._has_changes
+
+
+def _TableFromFlatBytes(data):
+  # https://cs.android.com/android/platform/superproject/+/master:frameworks/base/tools/aapt2/format/Container.cpp
+  size_idx = len(_FLAT_ARSC_HEADER)
+  proto_idx = size_idx + 8
+  if data[:size_idx] != _FLAT_ARSC_HEADER:
+    raise Exception('Error parsing {} in {}'.format(info.filename, zip_path))
+  # Size is stored as uint64.
+  size = struct.unpack('<Q', data[size_idx:proto_idx])[0]
+  table = Resources_pb2.ResourceTable()
+  proto_bytes = data[proto_idx:proto_idx + size]
+  table.ParseFromString(proto_bytes)
+  return table
+
+
+def _FlatBytesFromTable(table):
+  proto_bytes = table.SerializeToString()
+  size = struct.pack('<Q', len(proto_bytes))
+  overage = len(proto_bytes) % 4
+  padding = b'\0' * (4 - overage) if overage else b''
+  return b''.join((_FLAT_ARSC_HEADER, size, proto_bytes, padding))
+
+
+def StripUnwantedResources(partial_path, keep_predicate):
+  """Removes resources from .arsc.flat files inside of a .zip.
+
+  Args:
+    partial_path: Path to a .zip containing .arsc.flat entries
+    keep_predicate: Given "$partial_path/$res_type/$res_name", returns
+      whether to keep the resource.
+  """
+  stripper = _ResourceStripper(partial_path, keep_predicate)
+
+  def process_file(filename, data):
+    if filename.endswith('.arsc.flat'):
+      table = _TableFromFlatBytes(data)
+      if stripper.StripTable(table):
+        data = _FlatBytesFromTable(table)
+    return data
+
+  _ProcessZip(partial_path, process_file)
diff --git a/third_party/libwebrtc/build/android/gyp/util/resource_utils.py b/third_party/libwebrtc/build/android/gyp/util/resource_utils.py
new file mode 100644
index 0000000000..4f64174193
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/resource_utils.py
@@ -0,0 +1,1078 @@
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import argparse
+import collections
+import contextlib
+import itertools
+import os
+import re
+import shutil
+import subprocess
+import sys
+import tempfile
+import zipfile
+from xml.etree import ElementTree
+
+import util.build_utils as build_utils
+
+_SOURCE_ROOT = os.path.abspath(
+    os.path.join(os.path.dirname(__file__), '..', '..', '..', '..'))
+# Import jinja2 from third_party/jinja2
+sys.path.insert(1, os.path.join(_SOURCE_ROOT, 'third_party'))
+from jinja2 import Template # pylint: disable=F0401
+
+
+# A variation of these maps also exists in:
+# //base/android/java/src/org/chromium/base/LocaleUtils.java
+# //ui/android/java/src/org/chromium/base/LocalizationUtils.java
+_CHROME_TO_ANDROID_LOCALE_MAP = {
+    'es-419': 'es-rUS',
+    'sr-Latn': 'b+sr+Latn',
+    'fil': 'tl',
+    'he': 'iw',
+    'id': 'in',
+    'yi': 'ji',
+}
+_ANDROID_TO_CHROMIUM_LANGUAGE_MAP = {
+    'tl': 'fil',
+    'iw': 'he',
+    'in': 'id',
+    'ji': 'yi',
+    'no': 'nb',  # 'no' is not a real language. http://crbug.com/920960
+}
+
+_ALL_RESOURCE_TYPES = {
+    'anim', 'animator', 'array', 'attr', 'bool', 'color', 'dimen', 'drawable',
+    'font', 'fraction', 'id', 'integer', 'interpolator', 'layout', 'macro',
+    'menu', 'mipmap', 'plurals', 'raw', 'string', 'style', 'styleable',
+    'transition', 'xml'
+}
+
+AAPT_IGNORE_PATTERN = ':'.join([
+    '*OWNERS',  # Allow OWNERS files within res/
+    'DIR_METADATA', # Allow DIR_METADATA files within res/
+    '*.py',  # PRESUBMIT.py sometimes exist.
+    '*.pyc',
+    '*~',  # Some editors create these as temp files.
+    '.*',  # Never makes sense to include dot(files/dirs).
+    '*.d.stamp',  # Ignore stamp files
+    '*.backup',  # Some tools create temporary backup files.
+])
+
+MULTIPLE_RES_MAGIC_STRING = b'magic'
+
+
+def ToAndroidLocaleName(chromium_locale):
+  """Convert a Chromium locale name into a corresponding Android one."""
+  # Should be in sync with build/config/locales.gni.
+  # First handle the special cases, these are needed to deal with Android
+  # releases *before* 5.0/Lollipop.
+  android_locale = _CHROME_TO_ANDROID_LOCALE_MAP.get(chromium_locale)
+  if android_locale:
+    return android_locale
+
+  # Format of Chromium locale name is '<lang>' or '<lang>-<region>'
+  # where <lang> is a 2 or 3 letter language code (ISO 639-1 or 639-2)
+  # and region is a capitalized locale region name.
+  lang, _, region = chromium_locale.partition('-')
+  if not region:
+    return lang
+
+  # Translate newer language tags into obsolete ones. Only necessary if
+  #  region is not None (e.g. 'he-IL' -> 'iw-rIL')
+  lang = _CHROME_TO_ANDROID_LOCALE_MAP.get(lang, lang)
+
+  # Using '<lang>-r<region>' is now acceptable as a locale name for all
+  # versions of Android.
+  return '%s-r%s' % (lang, region)
+
+
+# ISO 639 language code + optional ("-r" + capitalized region code).
+# Note that before Android 5.0/Lollipop, only 2-letter ISO 639-1 codes
+# are supported.
+_RE_ANDROID_LOCALE_QUALIFIER_1 = re.compile(r'^([a-z]{2,3})(\-r([A-Z]+))?$')
+
+# Starting with Android 7.0/Nougat, BCP 47 codes are supported but must
+# be prefixed with 'b+', and may include optional tags.
+#  e.g. 'b+en+US', 'b+ja+Latn', 'b+ja+Latn+JP'
+_RE_ANDROID_LOCALE_QUALIFIER_2 = re.compile(r'^b\+([a-z]{2,3})(\+.+)?$')
+
+
+def ToChromiumLocaleName(android_locale):
+  """Convert an Android locale name into a Chromium one."""
+  lang = None
+  region = None
+  script = None
+  m = _RE_ANDROID_LOCALE_QUALIFIER_1.match(android_locale)
+  if m:
+    lang = m.group(1)
+    if m.group(2):
+      region = m.group(3)
+  elif _RE_ANDROID_LOCALE_QUALIFIER_2.match(android_locale):
+    # Split an Android BCP-47 locale (e.g. b+sr+Latn+RS)
+    tags = android_locale.split('+')
+
+    # The Lang tag is always the first tag.
+    lang = tags[1]
+
+    # The optional region tag is 2ALPHA or 3DIGIT tag in pos 1 or 2.
+    # The optional script tag is 4ALPHA and always in pos 1.
+    optional_tags = iter(tags[2:])
+
+    next_tag = next(optional_tags, None)
+    if next_tag and len(next_tag) == 4:
+      script = next_tag
+      next_tag = next(optional_tags, None)
+    if next_tag and len(next_tag) < 4:
+      region = next_tag
+
+  if not lang:
+    return None
+
+  # Special case for es-rUS -> es-419
+  if lang == 'es' and region == 'US':
+    return 'es-419'
+
+  lang = _ANDROID_TO_CHROMIUM_LANGUAGE_MAP.get(lang, lang)
+
+  if script:
+    lang = '%s-%s' % (lang, script)
+
+  if not region:
+    return lang
+
+  return '%s-%s' % (lang, region)
+
+
+def IsAndroidLocaleQualifier(string):
+  """Returns true if |string| is a valid Android resource locale qualifier."""
+  return (_RE_ANDROID_LOCALE_QUALIFIER_1.match(string)
+          or _RE_ANDROID_LOCALE_QUALIFIER_2.match(string))
+
+
+def FindLocaleInStringResourceFilePath(file_path):
+  """Return Android locale name of a string resource file path.
+
+  Args:
+    file_path: A file path.
+  Returns:
+    If |file_path| is of the format '.../values-<locale>/<name>.xml', return
+    the value of <locale> (and Android locale qualifier). Otherwise return None.
+  """
+  if not file_path.endswith('.xml'):
+    return None
+  prefix = 'values-'
+  dir_name = os.path.basename(os.path.dirname(file_path))
+  if not dir_name.startswith(prefix):
+    return None
+  qualifier = dir_name[len(prefix):]
+  return qualifier if IsAndroidLocaleQualifier(qualifier) else None
+
+
+def ToAndroidLocaleList(locale_list):
+  """Convert a list of Chromium locales into the corresponding Android list."""
+  return sorted(ToAndroidLocaleName(locale) for locale in locale_list)
+
+# Represents a line from a R.txt file.
+_TextSymbolEntry = collections.namedtuple('RTextEntry',
+    ('java_type', 'resource_type', 'name', 'value'))
+
+
+def _GenerateGlobs(pattern):
+  # This function processes the aapt ignore assets pattern into a list of globs
+  # to be used to exclude files using build_utils.MatchesGlob. It removes the
+  # '!', which is used by aapt to mean 'not chatty' so it does not output if the
+  # file is ignored (we dont output anyways, so it is not required). This
+  # function does not handle the <dir> and <file> prefixes used by aapt and are
+  # assumed not to be included in the pattern string.
+  return pattern.replace('!', '').split(':')
+
+
+def DeduceResourceDirsFromFileList(resource_files):
+  """Return a list of resource directories from a list of resource files."""
+  # Directory list order is important, cannot use set or other data structures
+  # that change order. This is because resource files of the same name in
+  # multiple res/ directories ellide one another (the last one passed is used).
+  # Thus the order must be maintained to prevent non-deterministic and possibly
+  # flakey builds.
+  resource_dirs = []
+  for resource_path in resource_files:
+    # Resources are always 1 directory deep under res/.
+    res_dir = os.path.dirname(os.path.dirname(resource_path))
+    if res_dir not in resource_dirs:
+      resource_dirs.append(res_dir)
+
+  # Check if any resource_dirs are children of other ones. This indicates that a
+  # file was listed that is not exactly 1 directory deep under res/.
+  # E.g.:
+  # sources = ["java/res/values/foo.xml", "java/res/README.md"]
+  # ^^ This will cause "java" to be detected as resource directory.
+  for a, b in itertools.permutations(resource_dirs, 2):
+    if not os.path.relpath(a, b).startswith('..'):
+      bad_sources = (s for s in resource_files
+                     if os.path.dirname(os.path.dirname(s)) == b)
+      msg = """\
+Resource(s) found that are not in a proper directory structure:
+  {}
+All resource files must follow a structure of "$ROOT/$SUBDIR/$FILE"."""
+      raise Exception(msg.format('\n  '.join(bad_sources)))
+
+  return resource_dirs
+
+
+def IterResourceFilesInDirectories(directories,
+                                   ignore_pattern=AAPT_IGNORE_PATTERN):
+  globs = _GenerateGlobs(ignore_pattern)
+  for d in directories:
+    for root, _, files in os.walk(d):
+      for f in files:
+        archive_path = f
+        parent_dir = os.path.relpath(root, d)
+        if parent_dir != '.':
+          archive_path = os.path.join(parent_dir, f)
+        path = os.path.join(root, f)
+        if build_utils.MatchesGlob(archive_path, globs):
+          continue
+        yield path, archive_path
+
+
+class ResourceInfoFile(object):
+  """Helper for building up .res.info files."""
+
+  def __init__(self):
+    # Dict of archive_path -> source_path for the current target.
+    self._entries = {}
+    # List of (old_archive_path, new_archive_path) tuples.
+    self._renames = []
+    # We don't currently support using both AddMapping and MergeInfoFile.
+    self._add_mapping_was_called = False
+
+  def AddMapping(self, archive_path, source_path):
+    """Adds a single |archive_path| -> |source_path| entry."""
+    self._add_mapping_was_called = True
+    # "values/" files do not end up in the apk except through resources.arsc.
+    if archive_path.startswith('values'):
+      return
+    source_path = os.path.normpath(source_path)
+    new_value = self._entries.setdefault(archive_path, source_path)
+    if new_value != source_path:
+      raise Exception('Duplicate AddMapping for "{}". old={} new={}'.format(
+          archive_path, new_value, source_path))
+
+  def RegisterRename(self, old_archive_path, new_archive_path):
+    """Records an archive_path rename.
+
+    |old_archive_path| does not need to currently exist in the mappings. Renames
+    are buffered and replayed only when Write() is called.
+    """
+    if not old_archive_path.startswith('values'):
+      self._renames.append((old_archive_path, new_archive_path))
+
+  def MergeInfoFile(self, info_file_path):
+    """Merges the mappings from |info_file_path| into this object.
+
+    Any existing entries are overridden.
+    """
+    assert not self._add_mapping_was_called
+    # Allows clobbering, which is used when overriding resources.
+    with open(info_file_path) as f:
+      self._entries.update(l.rstrip().split('\t') for l in f)
+
+  def _ApplyRenames(self):
+    applied_renames = set()
+    ret = self._entries
+    for rename_tup in self._renames:
+      # Duplicate entries happen for resource overrides.
+      # Use a "seen" set to ensure we still error out if multiple renames
+      # happen for the same old_archive_path with different new_archive_paths.
+      if rename_tup in applied_renames:
+        continue
+      applied_renames.add(rename_tup)
+      old_archive_path, new_archive_path = rename_tup
+      ret[new_archive_path] = ret[old_archive_path]
+      del ret[old_archive_path]
+
+    self._entries = None
+    self._renames = None
+    return ret
+
+  def Write(self, info_file_path):
+    """Applies renames and writes out the file.
+
+    No other methods may be called after this.
+    """
+    entries = self._ApplyRenames()
+    lines = []
+    for archive_path, source_path in entries.items():
+      lines.append('{}\t{}\n'.format(archive_path, source_path))
+    with open(info_file_path, 'w') as info_file:
+      info_file.writelines(sorted(lines))
+
+
+def _ParseTextSymbolsFile(path, fix_package_ids=False):
+  """Given an R.txt file, returns a list of _TextSymbolEntry.
+
+  Args:
+    path: Input file path.
+    fix_package_ids: if True, 0x00 and 0x02 package IDs read from the file
+      will be fixed to 0x7f.
+  Returns:
+    A list of _TextSymbolEntry instances.
+  Raises:
+    Exception: An unexpected line was detected in the input.
+  """
+  ret = []
+  with open(path) as f:
+    for line in f:
+      m = re.match(r'(int(?:\[\])?) (\w+) (\w+) (.+)$', line)
+      if not m:
+        raise Exception('Unexpected line in R.txt: %s' % line)
+      java_type, resource_type, name, value = m.groups()
+      if fix_package_ids:
+        value = _FixPackageIds(value)
+      ret.append(_TextSymbolEntry(java_type, resource_type, name, value))
+  return ret
+
+
+def _FixPackageIds(resource_value):
+  # Resource IDs for resources belonging to regular APKs have their first byte
+  # as 0x7f (package id). However with webview, since it is not a regular apk
+  # but used as a shared library, aapt is passed the --shared-resources flag
+  # which changes some of the package ids to 0x00.  This function normalises
+  # these (0x00) package ids to 0x7f, which the generated code in R.java changes
+  # to the correct package id at runtime.  resource_value is a string with
+  # either, a single value '0x12345678', or an array of values like '{
+  # 0xfedcba98, 0x01234567, 0x56789abc }'
+  return resource_value.replace('0x00', '0x7f')
+
+
+def _GetRTxtResourceNames(r_txt_path):
+  """Parse an R.txt file and extract the set of resource names from it."""
+  return {entry.name for entry in _ParseTextSymbolsFile(r_txt_path)}
+
+
+def GetRTxtStringResourceNames(r_txt_path):
+  """Parse an R.txt file and the list of its string resource names."""
+  return sorted({
+      entry.name
+      for entry in _ParseTextSymbolsFile(r_txt_path)
+      if entry.resource_type == 'string'
+  })
+
+
+def GenerateStringResourcesAllowList(module_r_txt_path, allowlist_r_txt_path):
+  """Generate a allowlist of string resource IDs.
+
+  Args:
+    module_r_txt_path: Input base module R.txt path.
+    allowlist_r_txt_path: Input allowlist R.txt path.
+  Returns:
+    A dictionary mapping numerical resource IDs to the corresponding
+    string resource names. The ID values are taken from string resources in
+    |module_r_txt_path| that are also listed by name in |allowlist_r_txt_path|.
+  """
+  allowlisted_names = {
+      entry.name
+      for entry in _ParseTextSymbolsFile(allowlist_r_txt_path)
+      if entry.resource_type == 'string'
+  }
+  return {
+      int(entry.value, 0): entry.name
+      for entry in _ParseTextSymbolsFile(module_r_txt_path)
+      if entry.resource_type == 'string' and entry.name in allowlisted_names
+  }
+
+
+class RJavaBuildOptions:
+  """A class used to model the various ways to build an R.java file.
+
+  This is used to control which resource ID variables will be final or
+  non-final, and whether an onResourcesLoaded() method will be generated
+  to adjust the non-final ones, when the corresponding library is loaded
+  at runtime.
+
+  Note that by default, all resources are final, and there is no
+  method generated, which corresponds to calling ExportNoResources().
+  """
+  def __init__(self):
+    self.has_constant_ids = True
+    self.resources_allowlist = None
+    self.has_on_resources_loaded = False
+    self.export_const_styleable = False
+    self.final_package_id = None
+    self.fake_on_resources_loaded = False
+
+  def ExportNoResources(self):
+    """Make all resource IDs final, and don't generate a method."""
+    self.has_constant_ids = True
+    self.resources_allowlist = None
+    self.has_on_resources_loaded = False
+    self.export_const_styleable = False
+
+  def ExportAllResources(self):
+    """Make all resource IDs non-final in the R.java file."""
+    self.has_constant_ids = False
+    self.resources_allowlist = None
+
+  def ExportSomeResources(self, r_txt_file_path):
+    """Only select specific resource IDs to be non-final.
+
+    Args:
+      r_txt_file_path: The path to an R.txt file. All resources named
+        int it will be non-final in the generated R.java file, all others
+        will be final.
+    """
+    self.has_constant_ids = True
+    self.resources_allowlist = _GetRTxtResourceNames(r_txt_file_path)
+
+  def ExportAllStyleables(self):
+    """Make all styleable constants non-final, even non-resources ones.
+
+    Resources that are styleable but not of int[] type are not actually
+    resource IDs but constants. By default they are always final. Call this
+    method to make them non-final anyway in the final R.java file.
+    """
+    self.export_const_styleable = True
+
+  def GenerateOnResourcesLoaded(self, fake=False):
+    """Generate an onResourcesLoaded() method.
+
+    This Java method will be called at runtime by the framework when
+    the corresponding library (which includes the R.java source file)
+    will be loaded at runtime. This corresponds to the --shared-resources
+    or --app-as-shared-lib flags of 'aapt package'.
+
+    if |fake|, then the method will be empty bodied to compile faster. This
+    useful for dummy R.java files that will eventually be replaced by real
+    ones.
+    """
+    self.has_on_resources_loaded = True
+    self.fake_on_resources_loaded = fake
+
+  def SetFinalPackageId(self, package_id):
+    """Sets a package ID to be used for resources marked final."""
+    self.final_package_id = package_id
+
+  def _MaybeRewriteRTxtPackageIds(self, r_txt_path):
+    """Rewrites package IDs in the R.txt file if necessary.
+
+    If SetFinalPackageId() was called, some of the resource IDs may have had
+    their package ID changed. This function rewrites the R.txt file to match
+    those changes.
+    """
+    if self.final_package_id is None:
+      return
+
+    entries = _ParseTextSymbolsFile(r_txt_path)
+    with open(r_txt_path, 'w') as f:
+      for entry in entries:
+        value = entry.value
+        if self._IsResourceFinal(entry):
+          value = re.sub(r'0x(?:00|7f)',
+                         '0x{:02x}'.format(self.final_package_id), value)
+        f.write('{} {} {} {}\n'.format(entry.java_type, entry.resource_type,
+                                       entry.name, value))
+
+  def _IsResourceFinal(self, entry):
+    """Determines whether a resource should be final or not.
+
+  Args:
+    entry: A _TextSymbolEntry instance.
+  Returns:
+    True iff the corresponding entry should be final.
+  """
+    if entry.resource_type == 'styleable' and entry.java_type != 'int[]':
+      # A styleable constant may be exported as non-final after all.
+      return not self.export_const_styleable
+    elif not self.has_constant_ids:
+      # Every resource is non-final
+      return False
+    elif not self.resources_allowlist:
+      # No allowlist means all IDs are non-final.
+      return True
+    else:
+      # Otherwise, only those in the
+      return entry.name not in self.resources_allowlist
+
+
+def CreateRJavaFiles(srcjar_dir,
+                     package,
+                     main_r_txt_file,
+                     extra_res_packages,
+                     rjava_build_options,
+                     srcjar_out,
+                     custom_root_package_name=None,
+                     grandparent_custom_package_name=None,
+                     extra_main_r_text_files=None,
+                     ignore_mismatched_values=False):
+  """Create all R.java files for a set of packages and R.txt files.
+
+  Args:
+    srcjar_dir: The top-level output directory for the generated files.
+    package: Package name for R java source files which will inherit
+      from the root R java file.
+    main_r_txt_file: The main R.txt file containing the valid values
+      of _all_ resource IDs.
+    extra_res_packages: A list of extra package names.
+    rjava_build_options: An RJavaBuildOptions instance that controls how
+      exactly the R.java file is generated.
+    srcjar_out: Path of desired output srcjar.
+    custom_root_package_name: Custom package name for module root R.java file,
+      (eg. vr for gen.vr package).
+    grandparent_custom_package_name: Custom root package name for the root
+      R.java file to inherit from. DFM root R.java files will have "base"
+      as the grandparent_custom_package_name. The format of this package name
+      is identical to custom_root_package_name.
+      (eg. for vr grandparent_custom_package_name would be "base")
+    extra_main_r_text_files: R.txt files to be added to the root R.java file.
+    ignore_mismatched_values: If True, ignores if a resource appears multiple
+      times with different entry values (useful when all the values are
+      dummy anyways).
+  Raises:
+    Exception if a package name appears several times in |extra_res_packages|
+  """
+  rjava_build_options._MaybeRewriteRTxtPackageIds(main_r_txt_file)
+
+  packages = list(extra_res_packages)
+
+  if package and package not in packages:
+    # Sometimes, an apk target and a resources target share the same
+    # AndroidManifest.xml and thus |package| will already be in |packages|.
+    packages.append(package)
+
+  # Map of (resource_type, name) -> Entry.
+  # Contains the correct values for resources.
+  all_resources = {}
+  all_resources_by_type = collections.defaultdict(list)
+
+  main_r_text_files = [main_r_txt_file]
+  if extra_main_r_text_files:
+    main_r_text_files.extend(extra_main_r_text_files)
+  for r_txt_file in main_r_text_files:
+    for entry in _ParseTextSymbolsFile(r_txt_file, fix_package_ids=True):
+      entry_key = (entry.resource_type, entry.name)
+      if entry_key in all_resources:
+        if not ignore_mismatched_values:
+          assert entry == all_resources[entry_key], (
+              'Input R.txt %s provided a duplicate resource with a different '
+              'entry value. Got %s, expected %s.' %
+              (r_txt_file, entry, all_resources[entry_key]))
+      else:
+        all_resources[entry_key] = entry
+        all_resources_by_type[entry.resource_type].append(entry)
+        assert entry.resource_type in _ALL_RESOURCE_TYPES, (
+            'Unknown resource type: %s, add to _ALL_RESOURCE_TYPES!' %
+            entry.resource_type)
+
+  if custom_root_package_name:
+    # Custom package name is available, thus use it for root_r_java_package.
+    root_r_java_package = GetCustomPackagePath(custom_root_package_name)
+  else:
+    # Create a unique name using srcjar_out. Underscores are added to ensure
+    # no reserved keywords are used for directory names.
+    root_r_java_package = re.sub('[^\w\.]', '', srcjar_out.replace('/', '._'))
+
+  root_r_java_dir = os.path.join(srcjar_dir, *root_r_java_package.split('.'))
+  build_utils.MakeDirectory(root_r_java_dir)
+  root_r_java_path = os.path.join(root_r_java_dir, 'R.java')
+  root_java_file_contents = _RenderRootRJavaSource(
+      root_r_java_package, all_resources_by_type, rjava_build_options,
+      grandparent_custom_package_name)
+  with open(root_r_java_path, 'w') as f:
+    f.write(root_java_file_contents)
+
+  for package in packages:
+    _CreateRJavaSourceFile(srcjar_dir, package, root_r_java_package,
+                           rjava_build_options)
+
+
+def _CreateRJavaSourceFile(srcjar_dir, package, root_r_java_package,
+                           rjava_build_options):
+  """Generates an R.java source file."""
+  package_r_java_dir = os.path.join(srcjar_dir, *package.split('.'))
+  build_utils.MakeDirectory(package_r_java_dir)
+  package_r_java_path = os.path.join(package_r_java_dir, 'R.java')
+  java_file_contents = _RenderRJavaSource(package, root_r_java_package,
+                                          rjava_build_options)
+  with open(package_r_java_path, 'w') as f:
+    f.write(java_file_contents)
+
+
+# Resource IDs inside resource arrays are sorted. Application resource IDs start
+# with 0x7f but system resource IDs start with 0x01 thus system resource ids are
+# always at the start of the array. This function finds the index of the first
+# non system resource id to be used for package ID rewriting (we should not
+# rewrite system resource ids).
+def _GetNonSystemIndex(entry):
+  """Get the index of the first application resource ID within a resource
+  array."""
+  res_ids = re.findall(r'0x[0-9a-f]{8}', entry.value)
+  for i, res_id in enumerate(res_ids):
+    if res_id.startswith('0x7f'):
+      return i
+  return len(res_ids)
+
+
+def _RenderRJavaSource(package, root_r_java_package, rjava_build_options):
+  """Generates the contents of a R.java file."""
+  template = Template(
+      """/* AUTO-GENERATED FILE.  DO NOT MODIFY. */
+
+package {{ package }};
+
+public final class R {
+    {% for resource_type in resource_types %}
+    public static final class {{ resource_type }} extends
+            {{ root_package }}.R.{{ resource_type }} {}
+    {% endfor %}
+    {% if has_on_resources_loaded %}
+    public static void onResourcesLoaded(int packageId) {
+        {{ root_package }}.R.onResourcesLoaded(packageId);
+    }
+    {% endif %}
+}
+""",
+      trim_blocks=True,
+      lstrip_blocks=True)
+
+  return template.render(
+      package=package,
+      resource_types=sorted(_ALL_RESOURCE_TYPES),
+      root_package=root_r_java_package,
+      has_on_resources_loaded=rjava_build_options.has_on_resources_loaded)
+
+
+def GetCustomPackagePath(package_name):
+  return 'gen.' + package_name + '_module'
+
+
+def _RenderRootRJavaSource(package, all_resources_by_type, rjava_build_options,
+                           grandparent_custom_package_name):
+  """Render an R.java source file. See _CreateRJaveSourceFile for args info."""
+  final_resources_by_type = collections.defaultdict(list)
+  non_final_resources_by_type = collections.defaultdict(list)
+  for res_type, resources in all_resources_by_type.items():
+    for entry in resources:
+      # Entries in stylable that are not int[] are not actually resource ids
+      # but constants.
+      if rjava_build_options._IsResourceFinal(entry):
+        final_resources_by_type[res_type].append(entry)
+      else:
+        non_final_resources_by_type[res_type].append(entry)
+
+  # Here we diverge from what aapt does. Because we have so many
+  # resources, the onResourcesLoaded method was exceeding the 64KB limit that
+  # Java imposes. For this reason we split onResourcesLoaded into different
+  # methods for each resource type.
+  extends_string = ''
+  dep_path = ''
+  if grandparent_custom_package_name:
+    extends_string = 'extends {{ parent_path }}.R.{{ resource_type }} '
+    dep_path = GetCustomPackagePath(grandparent_custom_package_name)
+
+  template = Template("""/* AUTO-GENERATED FILE.  DO NOT MODIFY. */
+
+package {{ package }};
+
+public final class R {
+    {% for resource_type in resource_types %}
+    public static class {{ resource_type }} """ + extends_string + """ {
+        {% for e in final_resources[resource_type] %}
+        public static final {{ e.java_type }} {{ e.name }} = {{ e.value }};
+        {% endfor %}
+        {% for e in non_final_resources[resource_type] %}
+            {% if e.value != '0' %}
+        public static {{ e.java_type }} {{ e.name }} = {{ e.value }};
+            {% else %}
+        public static {{ e.java_type }} {{ e.name }};
+            {% endif %}
+        {% endfor %}
+    }
+    {% endfor %}
+    {% if has_on_resources_loaded %}
+      {% if fake_on_resources_loaded %}
+    public static void onResourcesLoaded(int packageId) {
+    }
+      {% else %}
+    private static boolean sResourcesDidLoad;
+
+    private static void patchArray(
+            int[] arr, int startIndex, int packageIdTransform) {
+        for (int i = startIndex; i < arr.length; ++i) {
+            arr[i] ^= packageIdTransform;
+        }
+    }
+
+    public static void onResourcesLoaded(int packageId) {
+        if (sResourcesDidLoad) {
+            return;
+        }
+        sResourcesDidLoad = true;
+        int packageIdTransform = (packageId ^ 0x7f) << 24;
+        {#  aapt2 makes int[] resources refer to other resources by reference
+            rather than by value. Thus, need to transform the int[] resources
+            first, before the referenced resources are transformed in order to
+            ensure the transform applies exactly once.
+            See https://crbug.com/1237059 for context.
+        #}
+        {% for resource_type in resource_types %}
+        {% for e in non_final_resources[resource_type] %}
+        {% if e.java_type == 'int[]' %}
+        patchArray({{ e.resource_type }}.{{ e.name }}, {{ startIndex(e) }}, \
+packageIdTransform);
+        {% endif %}
+        {% endfor %}
+        {% endfor %}
+        {% for resource_type in resource_types %}
+        onResourcesLoaded{{ resource_type|title }}(packageIdTransform);
+        {% endfor %}
+    }
+    {% for res_type in resource_types %}
+    private static void onResourcesLoaded{{ res_type|title }} (
+            int packageIdTransform) {
+        {% for e in non_final_resources[res_type] %}
+        {% if res_type != 'styleable' and e.java_type != 'int[]' %}
+        {{ e.resource_type }}.{{ e.name }} ^= packageIdTransform;
+        {% endif %}
+        {% endfor %}
+    }
+    {% endfor %}
+      {% endif %}
+    {% endif %}
+}
+""",
+                      trim_blocks=True,
+                      lstrip_blocks=True)
+  return template.render(
+      package=package,
+      resource_types=sorted(_ALL_RESOURCE_TYPES),
+      has_on_resources_loaded=rjava_build_options.has_on_resources_loaded,
+      fake_on_resources_loaded=rjava_build_options.fake_on_resources_loaded,
+      final_resources=final_resources_by_type,
+      non_final_resources=non_final_resources_by_type,
+      startIndex=_GetNonSystemIndex,
+      parent_path=dep_path)
+
+
+def ExtractBinaryManifestValues(aapt2_path, apk_path):
+  """Returns (version_code, version_name, package_name) for the given apk."""
+  output = subprocess.check_output([
+      aapt2_path, 'dump', 'xmltree', apk_path, '--file', 'AndroidManifest.xml'
+  ]).decode('utf-8')
+  version_code = re.search(r'versionCode.*?=(\d*)', output).group(1)
+  version_name = re.search(r'versionName.*?="(.*?)"', output).group(1)
+  package_name = re.search(r'package.*?="(.*?)"', output).group(1)
+  return version_code, version_name, package_name
+
+
+def ExtractArscPackage(aapt2_path, apk_path):
+  """Returns (package_name, package_id) of resources.arsc from apk_path.
+
+  When the apk does not have any entries in its resources file, in recent aapt2
+  versions it will not contain a "Package" line. The package is not even in the
+  actual resources.arsc/resources.pb file (which itself is mostly empty). Thus
+  return (None, None) when dump succeeds and there are no errors to indicate
+  that the package name does not exist in the resources file.
+  """
+  proc = subprocess.Popen([aapt2_path, 'dump', 'resources', apk_path],
+                          stdout=subprocess.PIPE,
+                          stderr=subprocess.PIPE)
+  for line in proc.stdout:
+    line = line.decode('utf-8')
+    # Package name=org.chromium.webview_shell id=7f
+    if line.startswith('Package'):
+      proc.kill()
+      parts = line.split()
+      package_name = parts[1].split('=')[1]
+      package_id = parts[2][3:]
+      return package_name, int(package_id, 16)
+
+  # aapt2 currently crashes when dumping webview resources, but not until after
+  # it prints the "Package" line (b/130553900).
+  stderr_output = proc.stderr.read().decode('utf-8')
+  if stderr_output:
+    sys.stderr.write(stderr_output)
+    raise Exception('Failed to find arsc package name')
+  return None, None
+
+
+def _RenameSubdirsWithPrefix(dir_path, prefix):
+  subdirs = [
+      d for d in os.listdir(dir_path)
+      if os.path.isdir(os.path.join(dir_path, d))
+  ]
+  renamed_subdirs = []
+  for d in subdirs:
+    old_path = os.path.join(dir_path, d)
+    new_path = os.path.join(dir_path, '{}_{}'.format(prefix, d))
+    renamed_subdirs.append(new_path)
+    os.rename(old_path, new_path)
+  return renamed_subdirs
+
+
+def _HasMultipleResDirs(zip_path):
+  """Checks for magic comment set by prepare_resources.py
+
+  Returns: True iff the zipfile has the magic comment that means it contains
+  multiple res/ dirs inside instead of just contents of a single res/ dir
+  (without a wrapping res/).
+  """
+  with zipfile.ZipFile(zip_path) as z:
+    return z.comment == MULTIPLE_RES_MAGIC_STRING
+
+
+def ExtractDeps(dep_zips, deps_dir):
+  """Extract a list of resource dependency zip files.
+
+  Args:
+     dep_zips: A list of zip file paths, each one will be extracted to
+       a subdirectory of |deps_dir|, named after the zip file's path (e.g.
+       '/some/path/foo.zip' -> '{deps_dir}/some_path_foo/').
+    deps_dir: Top-level extraction directory.
+  Returns:
+    The list of all sub-directory paths, relative to |deps_dir|.
+  Raises:
+    Exception: If a sub-directory already exists with the same name before
+      extraction.
+  """
+  dep_subdirs = []
+  for z in dep_zips:
+    subdirname = z.replace(os.path.sep, '_')
+    subdir = os.path.join(deps_dir, subdirname)
+    if os.path.exists(subdir):
+      raise Exception('Resource zip name conflict: ' + subdirname)
+    build_utils.ExtractAll(z, path=subdir)
+    if _HasMultipleResDirs(z):
+      # basename of the directory is used to create a zip during resource
+      # compilation, include the path in the basename to help blame errors on
+      # the correct target. For example directory 0_res may be renamed
+      # chrome_android_chrome_app_java_resources_0_res pointing to the name and
+      # path of the android_resources target from whence it came.
+      subdir_subdirs = _RenameSubdirsWithPrefix(subdir, subdirname)
+      dep_subdirs.extend(subdir_subdirs)
+    else:
+      dep_subdirs.append(subdir)
+  return dep_subdirs
+
+
+class _ResourceBuildContext(object):
+  """A temporary directory for packaging and compiling Android resources.
+
+  Args:
+    temp_dir: Optional root build directory path. If None, a temporary
+      directory will be created, and removed in Close().
+  """
+
+  def __init__(self, temp_dir=None, keep_files=False):
+    """Initialized the context."""
+    # The top-level temporary directory.
+    if temp_dir:
+      self.temp_dir = temp_dir
+      os.makedirs(temp_dir)
+    else:
+      self.temp_dir = tempfile.mkdtemp()
+    self.remove_on_exit = not keep_files
+
+    # A location to store resources extracted form dependency zip files.
+    self.deps_dir = os.path.join(self.temp_dir, 'deps')
+    os.mkdir(self.deps_dir)
+    # A location to place aapt-generated files.
+    self.gen_dir = os.path.join(self.temp_dir, 'gen')
+    os.mkdir(self.gen_dir)
+    # A location to place generated R.java files.
+    self.srcjar_dir = os.path.join(self.temp_dir, 'java')
+    os.mkdir(self.srcjar_dir)
+    # Temporary file locacations.
+    self.r_txt_path = os.path.join(self.gen_dir, 'R.txt')
+    self.srcjar_path = os.path.join(self.temp_dir, 'R.srcjar')
+    self.info_path = os.path.join(self.temp_dir, 'size.info')
+    self.stable_ids_path = os.path.join(self.temp_dir, 'in_ids.txt')
+    self.emit_ids_path = os.path.join(self.temp_dir, 'out_ids.txt')
+    self.proguard_path = os.path.join(self.temp_dir, 'keeps.flags')
+    self.proguard_main_dex_path = os.path.join(self.temp_dir, 'maindex.flags')
+    self.arsc_path = os.path.join(self.temp_dir, 'out.ap_')
+    self.proto_path = os.path.join(self.temp_dir, 'out.proto.ap_')
+    self.optimized_arsc_path = os.path.join(self.temp_dir, 'out.opt.ap_')
+    self.optimized_proto_path = os.path.join(self.temp_dir, 'out.opt.proto.ap_')
+
+  def Close(self):
+    """Close the context and destroy all temporary files."""
+    if self.remove_on_exit:
+      shutil.rmtree(self.temp_dir)
+
+
+@contextlib.contextmanager
+def BuildContext(temp_dir=None, keep_files=False):
+  """Generator for a _ResourceBuildContext instance."""
+  context = None
+  try:
+    context = _ResourceBuildContext(temp_dir, keep_files)
+    yield context
+  finally:
+    if context:
+      context.Close()
+
+
+def ResourceArgsParser():
+  """Create an argparse.ArgumentParser instance with common argument groups.
+
+  Returns:
+    A tuple of (parser, in_group, out_group) corresponding to the parser
+    instance, and the input and output argument groups for it, respectively.
+  """
+  parser = argparse.ArgumentParser(description=__doc__)
+
+  input_opts = parser.add_argument_group('Input options')
+  output_opts = parser.add_argument_group('Output options')
+
+  build_utils.AddDepfileOption(output_opts)
+
+  input_opts.add_argument('--include-resources', required=True, action="append",
+                        help='Paths to arsc resource files used to link '
+                             'against. Can be specified multiple times.')
+
+  input_opts.add_argument('--dependencies-res-zips', required=True,
+                    help='Resources zip archives from dependents. Required to '
+                         'resolve @type/foo references into dependent '
+                         'libraries.')
+
+  input_opts.add_argument(
+      '--extra-res-packages',
+      help='Additional package names to generate R.java files for.')
+
+  return (parser, input_opts, output_opts)
+
+
+def HandleCommonOptions(options):
+  """Handle common command-line options after parsing.
+
+  Args:
+    options: the result of parse_args() on the parser returned by
+        ResourceArgsParser(). This function updates a few common fields.
+  """
+  options.include_resources = [build_utils.ParseGnList(r) for r in
+                               options.include_resources]
+  # Flatten list of include resources list to make it easier to use.
+  options.include_resources = [r for resources in options.include_resources
+                               for r in resources]
+
+  options.dependencies_res_zips = (
+      build_utils.ParseGnList(options.dependencies_res_zips))
+
+  # Don't use [] as default value since some script explicitly pass "".
+  if options.extra_res_packages:
+    options.extra_res_packages = (
+        build_utils.ParseGnList(options.extra_res_packages))
+  else:
+    options.extra_res_packages = []
+
+
+def ParseAndroidResourceStringsFromXml(xml_data):
+  """Parse and Android xml resource file and extract strings from it.
+
+  Args:
+    xml_data: XML file data.
+  Returns:
+    A (dict, namespaces) tuple, where |dict| maps string names to their UTF-8
+    encoded value, and |namespaces| is a dictionary mapping prefixes to URLs
+    corresponding to namespaces declared in the <resources> element.
+  """
+  # NOTE: This uses regular expression matching because parsing with something
+  # like ElementTree makes it tedious to properly parse some of the structured
+  # text found in string resources, e.g.:
+  #      <string msgid="3300176832234831527" \
+  #         name="abc_shareactionprovider_share_with_application">\
+  #             "Condividi tramite <ns1:g id="APPLICATION_NAME">%s</ns1:g>"\
+  #      </string>
+  result = {}
+
+  # Find <resources> start tag and extract namespaces from it.
+  m = re.search('<resources([^>]*)>', xml_data, re.MULTILINE)
+  if not m:
+    raise Exception('<resources> start tag expected: ' + xml_data)
+  input_data = xml_data[m.end():]
+  resource_attrs = m.group(1)
+  re_namespace = re.compile('\s*(xmlns:(\w+)="([^"]+)")')
+  namespaces = {}
+  while resource_attrs:
+    m = re_namespace.match(resource_attrs)
+    if not m:
+      break
+    namespaces[m.group(2)] = m.group(3)
+    resource_attrs = resource_attrs[m.end(1):]
+
+  # Find each string element now.
+  re_string_element_start = re.compile('<string ([^>]* )?name="([^">]+)"[^>]*>')
+  re_string_element_end = re.compile('</string>')
+  while input_data:
+    m = re_string_element_start.search(input_data)
+    if not m:
+      break
+    name = m.group(2)
+    input_data = input_data[m.end():]
+    m2 = re_string_element_end.search(input_data)
+    if not m2:
+      raise Exception('Expected closing string tag: ' + input_data)
+    text = input_data[:m2.start()]
+    input_data = input_data[m2.end():]
+    if len(text) and text[0] == '"' and text[-1] == '"':
+      text = text[1:-1]
+    result[name] = text
+
+  return result, namespaces
+
+
+def GenerateAndroidResourceStringsXml(names_to_utf8_text, namespaces=None):
+  """Generate an XML text corresponding to an Android resource strings map.
+
+  Args:
+    names_to_text: A dictionary mapping resource names to localized
+      text (encoded as UTF-8).
+    namespaces: A map of namespace prefix to URL.
+  Returns:
+    New non-Unicode string containing an XML data structure describing the
+    input as an Android resource .xml file.
+  """
+  result = '<?xml version="1.0" encoding="utf-8"?>\n'
+  result += '<resources'
+  if namespaces:
+    for prefix, url in sorted(namespaces.items()):
+      result += ' xmlns:%s="%s"' % (prefix, url)
+  result += '>\n'
+  if not names_to_utf8_text:
+    result += '<!-- this file intentionally empty -->\n'
+  else:
+    for name, utf8_text in sorted(names_to_utf8_text.items()):
+      result += '<string name="%s">"%s"</string>\n' % (name, utf8_text)
+  result += '</resources>\n'
+  return result.encode('utf8')
+
+
+def FilterAndroidResourceStringsXml(xml_file_path, string_predicate):
+  """Remove unwanted localized strings from an Android resource .xml file.
+
+  This function takes a |string_predicate| callable object that will
+  receive a resource string name, and should return True iff the
+  corresponding <string> element should be kept in the file.
+
+  Args:
+    xml_file_path: Android resource strings xml file path.
+    string_predicate: A predicate function which will receive the string name
+      and shal
+  """
+  with open(xml_file_path) as f:
+    xml_data = f.read()
+  strings_map, namespaces = ParseAndroidResourceStringsFromXml(xml_data)
+
+  string_deletion = False
+  for name in list(strings_map.keys()):
+    if not string_predicate(name):
+      del strings_map[name]
+      string_deletion = True
+
+  if string_deletion:
+    new_xml_data = GenerateAndroidResourceStringsXml(strings_map, namespaces)
+    with open(xml_file_path, 'wb') as f:
+      f.write(new_xml_data)
diff --git a/third_party/libwebrtc/build/android/gyp/util/resource_utils_test.py b/third_party/libwebrtc/build/android/gyp/util/resource_utils_test.py
new file mode 100755
index 0000000000..62d5b431e9
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/resource_utils_test.py
@@ -0,0 +1,275 @@
+#!/usr/bin/env python3
+# coding: utf-8
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import collections
+import os
+import sys
+import unittest
+
+sys.path.insert(
+    0, os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir)))
+from util import build_utils
+
+# Required because the following import needs build/android/gyp in the
+# Python path to import util.build_utils.
+_BUILD_ANDROID_GYP_ROOT = os.path.abspath(
+    os.path.join(os.path.dirname(__file__), os.pardir))
+sys.path.insert(1, _BUILD_ANDROID_GYP_ROOT)
+
+import resource_utils  # pylint: disable=relative-import
+
+# pylint: disable=line-too-long
+
+_TEST_XML_INPUT_1 = '''<?xml version="1.0" encoding="utf-8"?>
+<resources xmlns:android="http://schemas.android.com/apk/res/android">
+<string name="copy_to_clipboard_failure_message">"Lõikelauale kopeerimine ebaõnnestus"</string>
+<string name="low_memory_error">"Eelmist toimingut ei saa vähese mälu tõttu lõpetada"</string>
+<string name="opening_file_error">"Valit. faili avamine ebaõnnestus"</string>
+<string name="structured_text">"This is <android:g id="STRUCTURED_TEXT">%s</android:g>"</string>
+</resources>
+'''
+
+_TEST_XML_OUTPUT_2 = '''<?xml version="1.0" encoding="utf-8"?>
+<resources xmlns:android="http://schemas.android.com/apk/res/android">
+<string name="low_memory_error">"Eelmist toimingut ei saa vähese mälu tõttu lõpetada"</string>
+<string name="structured_text">"This is <android:g id="STRUCTURED_TEXT">%s</android:g>"</string>
+</resources>
+'''
+
+# pylint: enable=line-too-long
+
+_TEST_XML_OUTPUT_EMPTY = '''<?xml version="1.0" encoding="utf-8"?>
+<resources>
+<!-- this file intentionally empty -->
+</resources>
+'''
+
+_TEST_RESOURCES_MAP_1 = {
+    'low_memory_error': 'Eelmist toimingut ei saa vähese mälu tõttu lõpetada',
+    'opening_file_error': 'Valit. faili avamine ebaõnnestus',
+    'copy_to_clipboard_failure_message': 'Lõikelauale kopeerimine ebaõnnestus',
+    'structured_text': 'This is <android:g id="STRUCTURED_TEXT">%s</android:g>',
+}
+
+_TEST_NAMESPACES_1 = {'android': 'http://schemas.android.com/apk/res/android'}
+
+_TEST_RESOURCES_ALLOWLIST_1 = ['low_memory_error', 'structured_text']
+
+# Extracted from one generated Chromium R.txt file, with string resource
+# names shuffled randomly.
+_TEST_R_TXT = r'''int anim abc_fade_in 0x7f050000
+int anim abc_fade_out 0x7f050001
+int anim abc_grow_fade_in_from_bottom 0x7f050002
+int array DefaultCookiesSettingEntries 0x7f120002
+int array DefaultCookiesSettingValues 0x7f120003
+int array DefaultGeolocationSettingEntries 0x7f120004
+int attr actionBarDivider 0x7f0100e7
+int attr actionBarStyle 0x7f0100e2
+int string AllowedDomainsForAppsDesc 0x7f0c0105
+int string AlternateErrorPagesEnabledDesc 0x7f0c0107
+int string AuthAndroidNegotiateAccountTypeDesc 0x7f0c0109
+int string AllowedDomainsForAppsTitle 0x7f0c0104
+int string AlternateErrorPagesEnabledTitle 0x7f0c0106
+int[] styleable SnackbarLayout { 0x0101011f, 0x7f010076, 0x7f0100ba }
+int styleable SnackbarLayout_android_maxWidth 0
+int styleable SnackbarLayout_elevation 2
+'''
+
+# Test allowlist R.txt file. Note that AlternateErrorPagesEnabledTitle is
+# listed as an 'anim' and should thus be skipped. Similarly the string
+# 'ThisStringDoesNotAppear' should not be in the final result.
+_TEST_ALLOWLIST_R_TXT = r'''int anim AlternateErrorPagesEnabledTitle 0x7f0eeeee
+int string AllowedDomainsForAppsDesc 0x7f0c0105
+int string AlternateErrorPagesEnabledDesc 0x7f0c0107
+int string ThisStringDoesNotAppear 0x7f0fffff
+'''
+
+_TEST_R_TEXT_RESOURCES_IDS = {
+    0x7f0c0105: 'AllowedDomainsForAppsDesc',
+    0x7f0c0107: 'AlternateErrorPagesEnabledDesc',
+}
+
+# Names of string resources in _TEST_R_TXT, should be sorted!
+_TEST_R_TXT_STRING_RESOURCE_NAMES = sorted([
+    'AllowedDomainsForAppsDesc',
+    'AllowedDomainsForAppsTitle',
+    'AlternateErrorPagesEnabledDesc',
+    'AlternateErrorPagesEnabledTitle',
+    'AuthAndroidNegotiateAccountTypeDesc',
+])
+
+
+def _CreateTestFile(tmp_dir, file_name, file_data):
+  file_path = os.path.join(tmp_dir, file_name)
+  with open(file_path, 'wt') as f:
+    f.write(file_data)
+  return file_path
+
+
+
+class ResourceUtilsTest(unittest.TestCase):
+
+  def test_GetRTxtStringResourceNames(self):
+    with build_utils.TempDir() as tmp_dir:
+      tmp_file = _CreateTestFile(tmp_dir, "test_R.txt", _TEST_R_TXT)
+      self.assertListEqual(
+          resource_utils.GetRTxtStringResourceNames(tmp_file),
+          _TEST_R_TXT_STRING_RESOURCE_NAMES)
+
+  def test_GenerateStringResourcesAllowList(self):
+    with build_utils.TempDir() as tmp_dir:
+      tmp_module_rtxt_file = _CreateTestFile(tmp_dir, "test_R.txt", _TEST_R_TXT)
+      tmp_allowlist_rtxt_file = _CreateTestFile(tmp_dir, "test_allowlist_R.txt",
+                                                _TEST_ALLOWLIST_R_TXT)
+      self.assertDictEqual(
+          resource_utils.GenerateStringResourcesAllowList(
+              tmp_module_rtxt_file, tmp_allowlist_rtxt_file),
+          _TEST_R_TEXT_RESOURCES_IDS)
+
+  def test_IsAndroidLocaleQualifier(self):
+    good_locales = [
+        'en',
+        'en-rUS',
+        'fil',
+        'fil-rPH',
+        'iw',
+        'iw-rIL',
+        'b+en',
+        'b+en+US',
+        'b+ja+Latn',
+        'b+ja+JP+Latn',
+        'b+cmn+Hant-TW',
+    ]
+    bad_locales = [
+        'e', 'english', 'en-US', 'en_US', 'en-rus', 'b+e', 'b+english', 'b+ja+'
+    ]
+    for locale in good_locales:
+      self.assertTrue(
+          resource_utils.IsAndroidLocaleQualifier(locale),
+          msg="'%s' should be a good locale!" % locale)
+
+    for locale in bad_locales:
+      self.assertFalse(
+          resource_utils.IsAndroidLocaleQualifier(locale),
+          msg="'%s' should be a bad locale!" % locale)
+
+  def test_ToAndroidLocaleName(self):
+    _TEST_CHROMIUM_TO_ANDROID_LOCALE_MAP = {
+        'en': 'en',
+        'en-US': 'en-rUS',
+        'en-FOO': 'en-rFOO',
+        'fil': 'tl',
+        'tl': 'tl',
+        'he': 'iw',
+        'he-IL': 'iw-rIL',
+        'id': 'in',
+        'id-BAR': 'in-rBAR',
+        'nb': 'nb',
+        'yi': 'ji'
+    }
+    for chromium_locale, android_locale in \
+        _TEST_CHROMIUM_TO_ANDROID_LOCALE_MAP.items():
+      result = resource_utils.ToAndroidLocaleName(chromium_locale)
+      self.assertEqual(result, android_locale)
+
+  def test_ToChromiumLocaleName(self):
+    _TEST_ANDROID_TO_CHROMIUM_LOCALE_MAP = {
+        'foo': 'foo',
+        'foo-rBAR': 'foo-BAR',
+        'b+lll': 'lll',
+        'b+ll+Extra': 'll',
+        'b+ll+RR': 'll-RR',
+        'b+lll+RR+Extra': 'lll-RR',
+        'b+ll+RRR+Extra': 'll-RRR',
+        'b+ll+Ssss': 'll-Ssss',
+        'b+ll+Ssss+Extra': 'll-Ssss',
+        'b+ll+Ssss+RR': 'll-Ssss-RR',
+        'b+ll+Ssss+RRR': 'll-Ssss-RRR',
+        'b+ll+Ssss+RRR+Extra': 'll-Ssss-RRR',
+        'b+ll+Whatever': 'll',
+        'en': 'en',
+        'en-rUS': 'en-US',
+        'en-US': None,
+        'en-FOO': None,
+        'en-rFOO': 'en-FOO',
+        'es-rES': 'es-ES',
+        'es-rUS': 'es-419',
+        'tl': 'fil',
+        'fil': 'fil',
+        'iw': 'he',
+        'iw-rIL': 'he-IL',
+        'b+iw+IL': 'he-IL',
+        'in': 'id',
+        'in-rBAR': 'id-BAR',
+        'id-rBAR': 'id-BAR',
+        'nb': 'nb',
+        'no': 'nb',  # http://crbug.com/920960
+    }
+    for android_locale, chromium_locale in \
+        _TEST_ANDROID_TO_CHROMIUM_LOCALE_MAP.items():
+      result = resource_utils.ToChromiumLocaleName(android_locale)
+      self.assertEqual(result, chromium_locale)
+
+  def test_FindLocaleInStringResourceFilePath(self):
+    self.assertEqual(
+        None,
+        resource_utils.FindLocaleInStringResourceFilePath(
+            'res/values/whatever.xml'))
+    self.assertEqual(
+        'foo',
+        resource_utils.FindLocaleInStringResourceFilePath(
+            'res/values-foo/whatever.xml'))
+    self.assertEqual(
+        'foo-rBAR',
+        resource_utils.FindLocaleInStringResourceFilePath(
+            'res/values-foo-rBAR/whatever.xml'))
+    self.assertEqual(
+        None,
+        resource_utils.FindLocaleInStringResourceFilePath(
+            'res/values-foo/ignore-subdirs/whatever.xml'))
+
+  def test_ParseAndroidResourceStringsFromXml(self):
+    ret, namespaces = resource_utils.ParseAndroidResourceStringsFromXml(
+        _TEST_XML_INPUT_1)
+    self.assertDictEqual(ret, _TEST_RESOURCES_MAP_1)
+    self.assertDictEqual(namespaces, _TEST_NAMESPACES_1)
+
+  def test_GenerateAndroidResourceStringsXml(self):
+    # Fist, an empty strings map, with no namespaces
+    result = resource_utils.GenerateAndroidResourceStringsXml({})
+    self.assertEqual(result.decode('utf8'), _TEST_XML_OUTPUT_EMPTY)
+
+    result = resource_utils.GenerateAndroidResourceStringsXml(
+        _TEST_RESOURCES_MAP_1, _TEST_NAMESPACES_1)
+    self.assertEqual(result.decode('utf8'), _TEST_XML_INPUT_1)
+
+  @staticmethod
+  def _CreateTestResourceFile(output_dir, locale, string_map, namespaces):
+    values_dir = os.path.join(output_dir, 'values-' + locale)
+    build_utils.MakeDirectory(values_dir)
+    file_path = os.path.join(values_dir, 'strings.xml')
+    with open(file_path, 'wb') as f:
+      file_data = resource_utils.GenerateAndroidResourceStringsXml(
+          string_map, namespaces)
+      f.write(file_data)
+    return file_path
+
+  def _CheckTestResourceFile(self, file_path, expected_data):
+    with open(file_path) as f:
+      file_data = f.read()
+    self.assertEqual(file_data, expected_data)
+
+  def test_FilterAndroidResourceStringsXml(self):
+    with build_utils.TempDir() as tmp_path:
+      test_file = self._CreateTestResourceFile(
+          tmp_path, 'foo', _TEST_RESOURCES_MAP_1, _TEST_NAMESPACES_1)
+      resource_utils.FilterAndroidResourceStringsXml(
+          test_file, lambda x: x in _TEST_RESOURCES_ALLOWLIST_1)
+      self._CheckTestResourceFile(test_file, _TEST_XML_OUTPUT_2)
+
+
+if __name__ == '__main__':
+  unittest.main()
diff --git a/third_party/libwebrtc/build/android/gyp/util/resources_parser.py b/third_party/libwebrtc/build/android/gyp/util/resources_parser.py
new file mode 100644
index 0000000000..8d8d69cce8
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/resources_parser.py
@@ -0,0 +1,142 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import collections
+import os
+import re
+from xml.etree import ElementTree
+
+from util import build_utils
+from util import resource_utils
+
+_TextSymbolEntry = collections.namedtuple(
+    'RTextEntry', ('java_type', 'resource_type', 'name', 'value'))
+
+_DUMMY_RTXT_ID = '0x7f010001'
+_DUMMY_RTXT_INDEX = '1'
+
+
+def _ResourceNameToJavaSymbol(resource_name):
+  return re.sub('[\.:]', '_', resource_name)
+
+
+class RTxtGenerator(object):
+  def __init__(self,
+               res_dirs,
+               ignore_pattern=resource_utils.AAPT_IGNORE_PATTERN):
+    self.res_dirs = res_dirs
+    self.ignore_pattern = ignore_pattern
+
+  def _ParseDeclareStyleable(self, node):
+    ret = set()
+    stylable_name = _ResourceNameToJavaSymbol(node.attrib['name'])
+    ret.add(
+        _TextSymbolEntry('int[]', 'styleable', stylable_name,
+                         '{{{}}}'.format(_DUMMY_RTXT_ID)))
+    for child in node:
+      if child.tag == 'eat-comment':
+        continue
+      if child.tag != 'attr':
+        # This parser expects everything inside <declare-stylable/> to be either
+        # an attr or an eat-comment. If new resource xml files are added that do
+        # not conform to this, this parser needs updating.
+        raise Exception('Unexpected tag {} inside <delcare-stylable/>'.format(
+            child.tag))
+      entry_name = '{}_{}'.format(
+          stylable_name, _ResourceNameToJavaSymbol(child.attrib['name']))
+      ret.add(
+          _TextSymbolEntry('int', 'styleable', entry_name, _DUMMY_RTXT_INDEX))
+      if not child.attrib['name'].startswith('android:'):
+        resource_name = _ResourceNameToJavaSymbol(child.attrib['name'])
+        ret.add(_TextSymbolEntry('int', 'attr', resource_name, _DUMMY_RTXT_ID))
+      for entry in child:
+        if entry.tag not in ('enum', 'flag'):
+          # This parser expects everything inside <attr/> to be either an
+          # <enum/> or an <flag/>. If new resource xml files are added that do
+          # not conform to this, this parser needs updating.
+          raise Exception('Unexpected tag {} inside <attr/>'.format(entry.tag))
+        resource_name = _ResourceNameToJavaSymbol(entry.attrib['name'])
+        ret.add(_TextSymbolEntry('int', 'id', resource_name, _DUMMY_RTXT_ID))
+    return ret
+
+  def _ExtractNewIdsFromNode(self, node):
+    ret = set()
+    # Sometimes there are @+id/ in random attributes (not just in android:id)
+    # and apparently that is valid. See:
+    # https://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html
+    for value in node.attrib.values():
+      if value.startswith('@+id/'):
+        resource_name = value[5:]
+        ret.add(_TextSymbolEntry('int', 'id', resource_name, _DUMMY_RTXT_ID))
+    for child in node:
+      ret.update(self._ExtractNewIdsFromNode(child))
+    return ret
+
+  def _ExtractNewIdsFromXml(self, xml_path):
+    root = ElementTree.parse(xml_path).getroot()
+    return self._ExtractNewIdsFromNode(root)
+
+  def _ParseValuesXml(self, xml_path):
+    ret = set()
+    root = ElementTree.parse(xml_path).getroot()
+    assert root.tag == 'resources'
+    for child in root:
+      if child.tag == 'eat-comment':
+        # eat-comment is just a dummy documentation element.
+        continue
+      if child.tag == 'skip':
+        # skip is just a dummy element.
+        continue
+      if child.tag == 'declare-styleable':
+        ret.update(self._ParseDeclareStyleable(child))
+      else:
+        if child.tag == 'item':
+          resource_type = child.attrib['type']
+        elif child.tag in ('array', 'integer-array', 'string-array'):
+          resource_type = 'array'
+        else:
+          resource_type = child.tag
+        name = _ResourceNameToJavaSymbol(child.attrib['name'])
+        ret.add(_TextSymbolEntry('int', resource_type, name, _DUMMY_RTXT_ID))
+    return ret
+
+  def _CollectResourcesListFromDirectory(self, res_dir):
+    ret = set()
+    globs = resource_utils._GenerateGlobs(self.ignore_pattern)
+    for root, _, files in os.walk(res_dir):
+      resource_type = os.path.basename(root)
+      if '-' in resource_type:
+        resource_type = resource_type[:resource_type.index('-')]
+      for f in files:
+        if build_utils.MatchesGlob(f, globs):
+          continue
+        if resource_type == 'values':
+          ret.update(self._ParseValuesXml(os.path.join(root, f)))
+        else:
+          if '.' in f:
+            resource_name = f[:f.index('.')]
+          else:
+            resource_name = f
+          ret.add(
+              _TextSymbolEntry('int', resource_type, resource_name,
+                               _DUMMY_RTXT_ID))
+          # Other types not just layouts can contain new ids (eg: Menus and
+          # Drawables). Just in case, look for new ids in all files.
+          if f.endswith('.xml'):
+            ret.update(self._ExtractNewIdsFromXml(os.path.join(root, f)))
+    return ret
+
+  def _CollectResourcesListFromDirectories(self):
+    ret = set()
+    for res_dir in self.res_dirs:
+      ret.update(self._CollectResourcesListFromDirectory(res_dir))
+    return ret
+
+  def WriteRTxtFile(self, rtxt_path):
+    resources = self._CollectResourcesListFromDirectories()
+    with build_utils.AtomicOutput(rtxt_path, mode='w') as f:
+      for resource in resources:
+        line = '{0.java_type} {0.resource_type} {0.name} {0.value}\n'.format(
+            resource)
+        f.write(line)
diff --git a/third_party/libwebrtc/build/android/gyp/util/server_utils.py b/third_party/libwebrtc/build/android/gyp/util/server_utils.py
new file mode 100644
index 0000000000..e050ef6552
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/server_utils.py
@@ -0,0 +1,41 @@
+# Copyright 2021 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import contextlib
+import json
+import os
+import socket
+
+# Use a unix abstract domain socket:
+# https://man7.org/linux/man-pages/man7/unix.7.html#:~:text=abstract:
+SOCKET_ADDRESS = '\0chromium_build_server_socket'
+BUILD_SERVER_ENV_VARIABLE = 'INVOKED_BY_BUILD_SERVER'
+
+
+def MaybeRunCommand(name, argv, stamp_file):
+  """Returns True if the command was successfully sent to the build server."""
+
+  # When the build server runs a command, it sets this environment variable.
+  # This prevents infinite recursion where the script sends a request to the
+  # build server, then the build server runs the script, and then the script
+  # sends another request to the build server.
+  if BUILD_SERVER_ENV_VARIABLE in os.environ:
+    return False
+  with contextlib.closing(socket.socket(socket.AF_UNIX)) as sock:
+    try:
+      sock.connect(SOCKET_ADDRESS)
+      sock.sendall(
+          json.dumps({
+              'name': name,
+              'cmd': argv,
+              'cwd': os.getcwd(),
+              'stamp_file': stamp_file,
+          }).encode('utf8'))
+    except socket.error as e:
+      # [Errno 111] Connection refused. Either the server has not been started
+      #             or the server is not currently accepting new connections.
+      if e.errno == 111:
+        return False
+      raise e
+  return True
diff --git a/third_party/libwebrtc/build/android/gyp/util/zipalign.py b/third_party/libwebrtc/build/android/gyp/util/zipalign.py
new file mode 100644
index 0000000000..c5c4ea88c6
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/zipalign.py
@@ -0,0 +1,97 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import struct
+import sys
+import zipfile
+
+from util import build_utils
+
+_FIXED_ZIP_HEADER_LEN = 30
+
+
+def _PatchedDecodeExtra(self):
+  # Try to decode the extra field.
+  extra = self.extra
+  unpack = struct.unpack
+  while len(extra) >= 4:
+    tp, ln = unpack('<HH', extra[:4])
+    if tp == 1:
+      if ln >= 24:
+        counts = unpack('<QQQ', extra[4:28])
+      elif ln == 16:
+        counts = unpack('<QQ', extra[4:20])
+      elif ln == 8:
+        counts = unpack('<Q', extra[4:12])
+      elif ln == 0:
+        counts = ()
+      else:
+        raise RuntimeError("Corrupt extra field %s" % (ln, ))
+
+      idx = 0
+
+      # ZIP64 extension (large files and/or large archives)
+      if self.file_size in (0xffffffffffffffff, 0xffffffff):
+        self.file_size = counts[idx]
+        idx += 1
+
+      if self.compress_size == 0xffffffff:
+        self.compress_size = counts[idx]
+        idx += 1
+
+      if self.header_offset == 0xffffffff:
+        self.header_offset = counts[idx]
+        idx += 1
+
+    extra = extra[ln + 4:]
+
+
+def ApplyZipFileZipAlignFix():
+  """Fix zipfile.ZipFile() to be able to open zipaligned .zip files.
+
+  Android's zip alignment uses not-quite-valid zip headers to perform alignment.
+  Python < 3.4 crashes when trying to load them.
+  https://bugs.python.org/issue14315
+  """
+  if sys.version_info < (3, 4):
+    zipfile.ZipInfo._decodeExtra = (  # pylint: disable=protected-access
+        _PatchedDecodeExtra)
+
+
+def _SetAlignment(zip_obj, zip_info, alignment):
+  """Sets a ZipInfo's extra field such that the file will be aligned.
+
+  Args:
+    zip_obj: The ZipFile object that is being written.
+    zip_info: The ZipInfo object about to be written.
+    alignment: The amount of alignment (e.g. 4, or 4*1024).
+  """
+  cur_offset = zip_obj.fp.tell()
+  header_size = _FIXED_ZIP_HEADER_LEN + len(zip_info.filename)
+  padding_needed = (alignment - (
+      (cur_offset + header_size) % alignment)) % alignment
+
+
+  # Python writes |extra| to both the local file header and the central
+  # directory's file header. Android's zipalign tool writes only to the
+  # local file header, so there is more overhead in using python to align.
+  zip_info.extra = b'\0' * padding_needed
+
+
+def AddToZipHermetic(zip_file,
+                     zip_path,
+                     src_path=None,
+                     data=None,
+                     compress=None,
+                     alignment=None):
+  """Same as build_utils.AddToZipHermetic(), but with alignment.
+
+  Args:
+    alignment: If set, align the data of the entry to this many bytes.
+  """
+  zipinfo = build_utils.HermeticZipInfo(filename=zip_path)
+  if alignment:
+    _SetAlignment(zip_file, zipinfo, alignment)
+  build_utils.AddToZipHermetic(
+      zip_file, zipinfo, src_path=src_path, data=data, compress=compress)