diff --git a/PRESUBMIT.py b/PRESUBMIT.py
new file mode 100644
index 0000000..9949150
--- /dev/null
+++ b/PRESUBMIT.py
@@ -0,0 +1,1708 @@
+# 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.
+
+"""Top-level presubmit script for Chromium.
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details about the presubmit API built into gcl.
+"""
+
+
+import re
+import sys
+
+
+_EXCLUDED_PATHS = (
+    r"^breakpad[\\\/].*",
+    r"^native_client_sdk[\\\/]src[\\\/]build_tools[\\\/]make_rules.py",
+    r"^native_client_sdk[\\\/]src[\\\/]build_tools[\\\/]make_simple.py",
+    r"^native_client_sdk[\\\/]src[\\\/]tools[\\\/].*.mk",
+    r"^net[\\\/]tools[\\\/]spdyshark[\\\/].*",
+    r"^skia[\\\/].*",
+    r"^v8[\\\/].*",
+    r".*MakeFile$",
+    r".+_autogen\.h$",
+    r".+[\\\/]pnacl_shim\.c$",
+    r"^gpu[\\\/]config[\\\/].*_list_json\.cc$",
+    r"^chrome[\\\/]browser[\\\/]resources[\\\/]pdf[\\\/]index.js"
+)
+
+# The NetscapePlugIn library is excluded from pan-project as it will soon
+# be deleted together with the rest of the NPAPI and it's not worthwhile to
+# update the coding style until then.
+_TESTRUNNER_PATHS = (
+    r"^content[\\\/]shell[\\\/]tools[\\\/]plugin[\\\/].*",
+)
+
+# Fragment of a regular expression that matches C++ and Objective-C++
+# implementation files.
+_IMPLEMENTATION_EXTENSIONS = r'\.(cc|cpp|cxx|mm)$'
+
+# Regular expression that matches code only used for test binaries
+# (best effort).
+_TEST_CODE_EXCLUDED_PATHS = (
+    r'.*[\\\/](fake_|test_|mock_).+%s' % _IMPLEMENTATION_EXTENSIONS,
+    r'.+_test_(base|support|util)%s' % _IMPLEMENTATION_EXTENSIONS,
+    r'.+_(api|browser|kif|perf|pixel|unit|ui)?test(_[a-z]+)?%s' %
+        _IMPLEMENTATION_EXTENSIONS,
+    r'.+profile_sync_service_harness%s' % _IMPLEMENTATION_EXTENSIONS,
+    r'.*[\\\/](test|tool(s)?)[\\\/].*',
+    # content_shell is used for running layout tests.
+    r'content[\\\/]shell[\\\/].*',
+    # At request of folks maintaining this folder.
+    r'chrome[\\\/]browser[\\\/]automation[\\\/].*',
+    # Non-production example code.
+    r'mojo[\\\/]examples[\\\/].*',
+    # Launcher for running iOS tests on the simulator.
+    r'testing[\\\/]iossim[\\\/]iossim\.mm$',
+)
+
+_TEST_ONLY_WARNING = (
+    'You might be calling functions intended only for testing from\n'
+    'production code.  It is OK to ignore this warning if you know what\n'
+    'you are doing, as the heuristics used to detect the situation are\n'
+    'not perfect.  The commit queue will not block on this warning.')
+
+
+_INCLUDE_ORDER_WARNING = (
+    'Your #include order seems to be broken. Send mail to\n'
+    'marja@chromium.org if this is not the case.')
+
+
+_BANNED_OBJC_FUNCTIONS = (
+    (
+      'addTrackingRect:',
+      (
+       'The use of -[NSView addTrackingRect:owner:userData:assumeInside:] is'
+       'prohibited. Please use CrTrackingArea instead.',
+       'http://dev.chromium.org/developers/coding-style/cocoa-dos-and-donts',
+      ),
+      False,
+    ),
+    (
+      r'/NSTrackingArea\W',
+      (
+       'The use of NSTrackingAreas is prohibited. Please use CrTrackingArea',
+       'instead.',
+       'http://dev.chromium.org/developers/coding-style/cocoa-dos-and-donts',
+      ),
+      False,
+    ),
+    (
+      'convertPointFromBase:',
+      (
+       'The use of -[NSView convertPointFromBase:] is almost certainly wrong.',
+       'Please use |convertPoint:(point) fromView:nil| instead.',
+       'http://dev.chromium.org/developers/coding-style/cocoa-dos-and-donts',
+      ),
+      True,
+    ),
+    (
+      'convertPointToBase:',
+      (
+       'The use of -[NSView convertPointToBase:] is almost certainly wrong.',
+       'Please use |convertPoint:(point) toView:nil| instead.',
+       'http://dev.chromium.org/developers/coding-style/cocoa-dos-and-donts',
+      ),
+      True,
+    ),
+    (
+      'convertRectFromBase:',
+      (
+       'The use of -[NSView convertRectFromBase:] is almost certainly wrong.',
+       'Please use |convertRect:(point) fromView:nil| instead.',
+       'http://dev.chromium.org/developers/coding-style/cocoa-dos-and-donts',
+      ),
+      True,
+    ),
+    (
+      'convertRectToBase:',
+      (
+       'The use of -[NSView convertRectToBase:] is almost certainly wrong.',
+       'Please use |convertRect:(point) toView:nil| instead.',
+       'http://dev.chromium.org/developers/coding-style/cocoa-dos-and-donts',
+      ),
+      True,
+    ),
+    (
+      'convertSizeFromBase:',
+      (
+       'The use of -[NSView convertSizeFromBase:] is almost certainly wrong.',
+       'Please use |convertSize:(point) fromView:nil| instead.',
+       'http://dev.chromium.org/developers/coding-style/cocoa-dos-and-donts',
+      ),
+      True,
+    ),
+    (
+      'convertSizeToBase:',
+      (
+       'The use of -[NSView convertSizeToBase:] is almost certainly wrong.',
+       'Please use |convertSize:(point) toView:nil| instead.',
+       'http://dev.chromium.org/developers/coding-style/cocoa-dos-and-donts',
+      ),
+      True,
+    ),
+)
+
+
+_BANNED_CPP_FUNCTIONS = (
+    # Make sure that gtest's FRIEND_TEST() macro is not used; the
+    # FRIEND_TEST_ALL_PREFIXES() macro from base/gtest_prod_util.h should be
+    # used instead since that allows for FLAKY_ and DISABLED_ prefixes.
+    (
+      'FRIEND_TEST(',
+      (
+       'Chromium code should not use gtest\'s FRIEND_TEST() macro. Include',
+       'base/gtest_prod_util.h and use FRIEND_TEST_ALL_PREFIXES() instead.',
+      ),
+      False,
+      (),
+    ),
+    (
+      'ScopedAllowIO',
+      (
+       'New code should not use ScopedAllowIO. Post a task to the blocking',
+       'pool or the FILE thread instead.',
+      ),
+      True,
+      (
+        r"^base[\\\/]process[\\\/]process_metrics_linux\.cc$",
+        r"^chrome[\\\/]browser[\\\/]chromeos[\\\/]boot_times_loader\.cc$",
+        r"^components[\\\/]crash[\\\/]app[\\\/]breakpad_mac\.mm$",
+        r"^content[\\\/]shell[\\\/]browser[\\\/]shell_browser_main\.cc$",
+        r"^content[\\\/]shell[\\\/]browser[\\\/]shell_message_filter\.cc$",
+        r"^mojo[\\\/]edk[\\\/]embedder[\\\/]" +
+            r"simple_platform_shared_buffer_posix\.cc$",
+        r"^net[\\\/]disk_cache[\\\/]cache_util\.cc$",
+        r"^net[\\\/]url_request[\\\/]test_url_fetcher_factory\.cc$",
+      ),
+    ),
+    (
+      'SkRefPtr',
+      (
+        'The use of SkRefPtr is prohibited. ',
+        'Please use skia::RefPtr instead.'
+      ),
+      True,
+      (),
+    ),
+    (
+      'SkAutoRef',
+      (
+        'The indirect use of SkRefPtr via SkAutoRef is prohibited. ',
+        'Please use skia::RefPtr instead.'
+      ),
+      True,
+      (),
+    ),
+    (
+      'SkAutoTUnref',
+      (
+        'The use of SkAutoTUnref is dangerous because it implicitly ',
+        'converts to a raw pointer. Please use skia::RefPtr instead.'
+      ),
+      True,
+      (),
+    ),
+    (
+      'SkAutoUnref',
+      (
+        'The indirect use of SkAutoTUnref through SkAutoUnref is dangerous ',
+        'because it implicitly converts to a raw pointer. ',
+        'Please use skia::RefPtr instead.'
+      ),
+      True,
+      (),
+    ),
+    (
+      r'/HANDLE_EINTR\(.*close',
+      (
+       'HANDLE_EINTR(close) is invalid. If close fails with EINTR, the file',
+       'descriptor will be closed, and it is incorrect to retry the close.',
+       'Either call close directly and ignore its return value, or wrap close',
+       'in IGNORE_EINTR to use its return value. See http://crbug.com/269623'
+      ),
+      True,
+      (),
+    ),
+    (
+      r'/IGNORE_EINTR\((?!.*close)',
+      (
+       'IGNORE_EINTR is only valid when wrapping close. To wrap other system',
+       'calls, use HANDLE_EINTR. See http://crbug.com/269623',
+      ),
+      True,
+      (
+        # Files that #define IGNORE_EINTR.
+        r'^base[\\\/]posix[\\\/]eintr_wrapper\.h$',
+        r'^ppapi[\\\/]tests[\\\/]test_broker\.cc$',
+      ),
+    ),
+    (
+      r'/v8::Extension\(',
+      (
+        'Do not introduce new v8::Extensions into the code base, use',
+        'gin::Wrappable instead. See http://crbug.com/334679',
+      ),
+      True,
+      (
+        r'extensions[\\\/]renderer[\\\/]safe_builtins\.*',
+      ),
+    ),
+)
+
+_IPC_ENUM_TRAITS_DEPRECATED = (
+    'You are using IPC_ENUM_TRAITS() in your code. It has been deprecated.\n'
+    'See http://www.chromium.org/Home/chromium-security/education/security-tips-for-ipc')
+
+
+_VALID_OS_MACROS = (
+    # Please keep sorted.
+    'OS_ANDROID',
+    'OS_ANDROID_HOST',
+    'OS_BSD',
+    'OS_CAT',       # For testing.
+    'OS_CHROMEOS',
+    'OS_FREEBSD',
+    'OS_IOS',
+    'OS_LINUX',
+    'OS_MACOSX',
+    'OS_NACL',
+    'OS_OPENBSD',
+    'OS_POSIX',
+    'OS_QNX',
+    'OS_SOLARIS',
+    'OS_WIN',
+)
+
+
+def _CheckNoProductionCodeUsingTestOnlyFunctions(input_api, output_api):
+  """Attempts to prevent use of functions intended only for testing in
+  non-testing code. For now this is just a best-effort implementation
+  that ignores header files and may have some false positives. A
+  better implementation would probably need a proper C++ parser.
+  """
+  # We only scan .cc files and the like, as the declaration of
+  # for-testing functions in header files are hard to distinguish from
+  # calls to such functions without a proper C++ parser.
+  file_inclusion_pattern = r'.+%s' % _IMPLEMENTATION_EXTENSIONS
+
+  base_function_pattern = r'[ :]test::[^\s]+|ForTest(ing)?|for_test(ing)?'
+  inclusion_pattern = input_api.re.compile(r'(%s)\s*\(' % base_function_pattern)
+  comment_pattern = input_api.re.compile(r'//.*(%s)' % base_function_pattern)
+  exclusion_pattern = input_api.re.compile(
+    r'::[A-Za-z0-9_]+(%s)|(%s)[^;]+\{' % (
+      base_function_pattern, base_function_pattern))
+
+  def FilterFile(affected_file):
+    black_list = (_EXCLUDED_PATHS +
+                  _TEST_CODE_EXCLUDED_PATHS +
+                  input_api.DEFAULT_BLACK_LIST)
+    return input_api.FilterSourceFile(
+      affected_file,
+      white_list=(file_inclusion_pattern, ),
+      black_list=black_list)
+
+  problems = []
+  for f in input_api.AffectedSourceFiles(FilterFile):
+    local_path = f.LocalPath()
+    for line_number, line in f.ChangedContents():
+      if (inclusion_pattern.search(line) and
+          not comment_pattern.search(line) and
+          not exclusion_pattern.search(line)):
+        problems.append(
+          '%s:%d\n    %s' % (local_path, line_number, line.strip()))
+
+  if problems:
+    return [output_api.PresubmitPromptOrNotify(_TEST_ONLY_WARNING, problems)]
+  else:
+    return []
+
+
+def _CheckNoIOStreamInHeaders(input_api, output_api):
+  """Checks to make sure no .h files include <iostream>."""
+  files = []
+  pattern = input_api.re.compile(r'^#include\s*<iostream>',
+                                 input_api.re.MULTILINE)
+  for f in input_api.AffectedSourceFiles(input_api.FilterSourceFile):
+    if not f.LocalPath().endswith('.h'):
+      continue
+    contents = input_api.ReadFile(f)
+    if pattern.search(contents):
+      files.append(f)
+
+  if len(files):
+    return [ output_api.PresubmitError(
+        'Do not #include <iostream> in header files, since it inserts static '
+        'initialization into every file including the header. Instead, '
+        '#include <ostream>. See http://crbug.com/94794',
+        files) ]
+  return []
+
+
+def _CheckNoUNIT_TESTInSourceFiles(input_api, output_api):
+  """Checks to make sure no source files use UNIT_TEST"""
+  problems = []
+  for f in input_api.AffectedFiles():
+    if (not f.LocalPath().endswith(('.cc', '.mm'))):
+      continue
+
+    for line_num, line in f.ChangedContents():
+      if 'UNIT_TEST ' in line or line.endswith('UNIT_TEST'):
+        problems.append('    %s:%d' % (f.LocalPath(), line_num))
+
+  if not problems:
+    return []
+  return [output_api.PresubmitPromptWarning('UNIT_TEST is only for headers.\n' +
+      '\n'.join(problems))]
+
+
+def _CheckNoNewWStrings(input_api, output_api):
+  """Checks to make sure we don't introduce use of wstrings."""
+  problems = []
+  for f in input_api.AffectedFiles():
+    if (not f.LocalPath().endswith(('.cc', '.h')) or
+        f.LocalPath().endswith(('test.cc', '_win.cc', '_win.h'))):
+      continue
+
+    allowWString = False
+    for line_num, line in f.ChangedContents():
+      if 'presubmit: allow wstring' in line:
+        allowWString = True
+      elif not allowWString and 'wstring' in line:
+        problems.append('    %s:%d' % (f.LocalPath(), line_num))
+        allowWString = False
+      else:
+        allowWString = False
+
+  if not problems:
+    return []
+  return [output_api.PresubmitPromptWarning('New code should not use wstrings.'
+      '  If you are calling a cross-platform API that accepts a wstring, '
+      'fix the API.\n' +
+      '\n'.join(problems))]
+
+
+def _CheckNoDEPSGIT(input_api, output_api):
+  """Make sure .DEPS.git is never modified manually."""
+  if any(f.LocalPath().endswith('.DEPS.git') for f in
+      input_api.AffectedFiles()):
+    return [output_api.PresubmitError(
+      'Never commit changes to .DEPS.git. This file is maintained by an\n'
+      'automated system based on what\'s in DEPS and your changes will be\n'
+      'overwritten.\n'
+      'See https://sites.google.com/a/chromium.org/dev/developers/how-tos/get-the-code#Rolling_DEPS\n'
+      'for more information')]
+  return []
+
+
+def _CheckValidHostsInDEPS(input_api, output_api):
+  """Checks that DEPS file deps are from allowed_hosts."""
+  # Run only if DEPS file has been modified to annoy fewer bystanders.
+  if all(f.LocalPath() != 'DEPS' for f in input_api.AffectedFiles()):
+    return []
+  # Outsource work to gclient verify
+  try:
+    input_api.subprocess.check_output(['gclient', 'verify'])
+    return []
+  except input_api.subprocess.CalledProcessError, error:
+    return [output_api.PresubmitError(
+        'DEPS file must have only git dependencies.',
+        long_text=error.output)]
+
+
+def _CheckNoBannedFunctions(input_api, output_api):
+  """Make sure that banned functions are not used."""
+  warnings = []
+  errors = []
+
+  file_filter = lambda f: f.LocalPath().endswith(('.mm', '.m', '.h'))
+  for f in input_api.AffectedFiles(file_filter=file_filter):
+    for line_num, line in f.ChangedContents():
+      for func_name, message, error in _BANNED_OBJC_FUNCTIONS:
+        matched = False
+        if func_name[0:1] == '/':
+          regex = func_name[1:]
+          if input_api.re.search(regex, line):
+            matched = True
+        elif func_name in line:
+            matched = True
+        if matched:
+          problems = warnings;
+          if error:
+            problems = errors;
+          problems.append('    %s:%d:' % (f.LocalPath(), line_num))
+          for message_line in message:
+            problems.append('      %s' % message_line)
+
+  file_filter = lambda f: f.LocalPath().endswith(('.cc', '.mm', '.h'))
+  for f in input_api.AffectedFiles(file_filter=file_filter):
+    for line_num, line in f.ChangedContents():
+      for func_name, message, error, excluded_paths in _BANNED_CPP_FUNCTIONS:
+        def IsBlacklisted(affected_file, blacklist):
+          local_path = affected_file.LocalPath()
+          for item in blacklist:
+            if input_api.re.match(item, local_path):
+              return True
+          return False
+        if IsBlacklisted(f, excluded_paths):
+          continue
+        matched = False
+        if func_name[0:1] == '/':
+          regex = func_name[1:]
+          if input_api.re.search(regex, line):
+            matched = True
+        elif func_name in line:
+            matched = True
+        if matched:
+          problems = warnings;
+          if error:
+            problems = errors;
+          problems.append('    %s:%d:' % (f.LocalPath(), line_num))
+          for message_line in message:
+            problems.append('      %s' % message_line)
+
+  result = []
+  if (warnings):
+    result.append(output_api.PresubmitPromptWarning(
+        'Banned functions were used.\n' + '\n'.join(warnings)))
+  if (errors):
+    result.append(output_api.PresubmitError(
+        'Banned functions were used.\n' + '\n'.join(errors)))
+  return result
+
+
+def _CheckNoPragmaOnce(input_api, output_api):
+  """Make sure that banned functions are not used."""
+  files = []
+  pattern = input_api.re.compile(r'^#pragma\s+once',
+                                 input_api.re.MULTILINE)
+  for f in input_api.AffectedSourceFiles(input_api.FilterSourceFile):
+    if not f.LocalPath().endswith('.h'):
+      continue
+    contents = input_api.ReadFile(f)
+    if pattern.search(contents):
+      files.append(f)
+
+  if files:
+    return [output_api.PresubmitError(
+        'Do not use #pragma once in header files.\n'
+        'See http://www.chromium.org/developers/coding-style#TOC-File-headers',
+        files)]
+  return []
+
+
+def _CheckNoTrinaryTrueFalse(input_api, output_api):
+  """Checks to make sure we don't introduce use of foo ? true : false."""
+  problems = []
+  pattern = input_api.re.compile(r'\?\s*(true|false)\s*:\s*(true|false)')
+  for f in input_api.AffectedFiles():
+    if not f.LocalPath().endswith(('.cc', '.h', '.inl', '.m', '.mm')):
+      continue
+
+    for line_num, line in f.ChangedContents():
+      if pattern.match(line):
+        problems.append('    %s:%d' % (f.LocalPath(), line_num))
+
+  if not problems:
+    return []
+  return [output_api.PresubmitPromptWarning(
+      'Please consider avoiding the "? true : false" pattern if possible.\n' +
+      '\n'.join(problems))]
+
+
+def _CheckUnwantedDependencies(input_api, output_api):
+  """Runs checkdeps on #include statements added in this
+  change. Breaking - rules is an error, breaking ! rules is a
+  warning.
+  """
+  # We need to wait until we have an input_api object and use this
+  # roundabout construct to import checkdeps because this file is
+  # eval-ed and thus doesn't have __file__.
+  original_sys_path = sys.path
+  try:
+    sys.path = sys.path + [input_api.os_path.join(
+        input_api.PresubmitLocalPath(), 'buildtools', 'checkdeps')]
+    import checkdeps
+    from cpp_checker import CppChecker
+    from rules import Rule
+  finally:
+    # Restore sys.path to what it was before.
+    sys.path = original_sys_path
+
+  added_includes = []
+  for f in input_api.AffectedFiles():
+    if not CppChecker.IsCppFile(f.LocalPath()):
+      continue
+
+    changed_lines = [line for line_num, line in f.ChangedContents()]
+    added_includes.append([f.LocalPath(), changed_lines])
+
+  deps_checker = checkdeps.DepsChecker(input_api.PresubmitLocalPath())
+
+  error_descriptions = []
+  warning_descriptions = []
+  for path, rule_type, rule_description in deps_checker.CheckAddedCppIncludes(
+      added_includes):
+    description_with_path = '%s\n    %s' % (path, rule_description)
+    if rule_type == Rule.DISALLOW:
+      error_descriptions.append(description_with_path)
+    else:
+      warning_descriptions.append(description_with_path)
+
+  results = []
+  if error_descriptions:
+    results.append(output_api.PresubmitError(
+        'You added one or more #includes that violate checkdeps rules.',
+        error_descriptions))
+  if warning_descriptions:
+    results.append(output_api.PresubmitPromptOrNotify(
+        'You added one or more #includes of files that are temporarily\n'
+        'allowed but being removed. Can you avoid introducing the\n'
+        '#include? See relevant DEPS file(s) for details and contacts.',
+        warning_descriptions))
+  return results
+
+
+def _CheckFilePermissions(input_api, output_api):
+  """Check that all files have their permissions properly set."""
+  if input_api.platform == 'win32':
+    return []
+  args = [sys.executable, 'tools/checkperms/checkperms.py', '--root',
+          input_api.change.RepositoryRoot()]
+  for f in input_api.AffectedFiles():
+    args += ['--file', f.LocalPath()]
+  checkperms = input_api.subprocess.Popen(args,
+                                          stdout=input_api.subprocess.PIPE)
+  errors = checkperms.communicate()[0].strip()
+  if errors:
+    return [output_api.PresubmitError('checkperms.py failed.',
+                                      errors.splitlines())]
+  return []
+
+
+def _CheckNoAuraWindowPropertyHInHeaders(input_api, output_api):
+  """Makes sure we don't include ui/aura/window_property.h
+  in header files.
+  """
+  pattern = input_api.re.compile(r'^#include\s*"ui/aura/window_property.h"')
+  errors = []
+  for f in input_api.AffectedFiles():
+    if not f.LocalPath().endswith('.h'):
+      continue
+    for line_num, line in f.ChangedContents():
+      if pattern.match(line):
+        errors.append('    %s:%d' % (f.LocalPath(), line_num))
+
+  results = []
+  if errors:
+    results.append(output_api.PresubmitError(
+      'Header files should not include ui/aura/window_property.h', errors))
+  return results
+
+
+def _CheckIncludeOrderForScope(scope, input_api, file_path, changed_linenums):
+  """Checks that the lines in scope occur in the right order.
+
+  1. C system files in alphabetical order
+  2. C++ system files in alphabetical order
+  3. Project's .h files
+  """
+
+  c_system_include_pattern = input_api.re.compile(r'\s*#include <.*\.h>')
+  cpp_system_include_pattern = input_api.re.compile(r'\s*#include <.*>')
+  custom_include_pattern = input_api.re.compile(r'\s*#include ".*')
+
+  C_SYSTEM_INCLUDES, CPP_SYSTEM_INCLUDES, CUSTOM_INCLUDES = range(3)
+
+  state = C_SYSTEM_INCLUDES
+
+  previous_line = ''
+  previous_line_num = 0
+  problem_linenums = []
+  for line_num, line in scope:
+    if c_system_include_pattern.match(line):
+      if state != C_SYSTEM_INCLUDES:
+        problem_linenums.append((line_num, previous_line_num))
+      elif previous_line and previous_line > line:
+        problem_linenums.append((line_num, previous_line_num))
+    elif cpp_system_include_pattern.match(line):
+      if state == C_SYSTEM_INCLUDES:
+        state = CPP_SYSTEM_INCLUDES
+      elif state == CUSTOM_INCLUDES:
+        problem_linenums.append((line_num, previous_line_num))
+      elif previous_line and previous_line > line:
+        problem_linenums.append((line_num, previous_line_num))
+    elif custom_include_pattern.match(line):
+      if state != CUSTOM_INCLUDES:
+        state = CUSTOM_INCLUDES
+      elif previous_line and previous_line > line:
+        problem_linenums.append((line_num, previous_line_num))
+    else:
+      problem_linenums.append(line_num)
+    previous_line = line
+    previous_line_num = line_num
+
+  warnings = []
+  for (line_num, previous_line_num) in problem_linenums:
+    if line_num in changed_linenums or previous_line_num in changed_linenums:
+      warnings.append('    %s:%d' % (file_path, line_num))
+  return warnings
+
+
+def _CheckIncludeOrderInFile(input_api, f, changed_linenums):
+  """Checks the #include order for the given file f."""
+
+  system_include_pattern = input_api.re.compile(r'\s*#include \<.*')
+  # Exclude the following includes from the check:
+  # 1) #include <.../...>, e.g., <sys/...> includes often need to appear in a
+  # specific order.
+  # 2) <atlbase.h>, "build/build_config.h"
+  excluded_include_pattern = input_api.re.compile(
+      r'\s*#include (\<.*/.*|\<atlbase\.h\>|"build/build_config.h")')
+  custom_include_pattern = input_api.re.compile(r'\s*#include "(?P<FILE>.*)"')
+  # Match the final or penultimate token if it is xxxtest so we can ignore it
+  # when considering the special first include.
+  test_file_tag_pattern = input_api.re.compile(
+    r'_[a-z]+test(?=(_[a-zA-Z0-9]+)?\.)')
+  if_pattern = input_api.re.compile(
+      r'\s*#\s*(if|elif|else|endif|define|undef).*')
+  # Some files need specialized order of includes; exclude such files from this
+  # check.
+  uncheckable_includes_pattern = input_api.re.compile(
+      r'\s*#include '
+      '("ipc/.*macros\.h"|<windows\.h>|".*gl.*autogen.h")\s*')
+
+  contents = f.NewContents()
+  warnings = []
+  line_num = 0
+
+  # Handle the special first include. If the first include file is
+  # some/path/file.h, the corresponding including file can be some/path/file.cc,
+  # some/other/path/file.cc, some/path/file_platform.cc, some/path/file-suffix.h
+  # etc. It's also possible that no special first include exists.
+  # If the included file is some/path/file_platform.h the including file could
+  # also be some/path/file_xxxtest_platform.h.
+  including_file_base_name = test_file_tag_pattern.sub(
+    '', input_api.os_path.basename(f.LocalPath()))
+
+  for line in contents:
+    line_num += 1
+    if system_include_pattern.match(line):
+      # No special first include -> process the line again along with normal
+      # includes.
+      line_num -= 1
+      break
+    match = custom_include_pattern.match(line)
+    if match:
+      match_dict = match.groupdict()
+      header_basename = test_file_tag_pattern.sub(
+        '', input_api.os_path.basename(match_dict['FILE'])).replace('.h', '')
+
+      if header_basename not in including_file_base_name:
+        # No special first include -> process the line again along with normal
+        # includes.
+        line_num -= 1
+      break
+
+  # Split into scopes: Each region between #if and #endif is its own scope.
+  scopes = []
+  current_scope = []
+  for line in contents[line_num:]:
+    line_num += 1
+    if uncheckable_includes_pattern.match(line):
+      continue
+    if if_pattern.match(line):
+      scopes.append(current_scope)
+      current_scope = []
+    elif ((system_include_pattern.match(line) or
+           custom_include_pattern.match(line)) and
+          not excluded_include_pattern.match(line)):
+      current_scope.append((line_num, line))
+  scopes.append(current_scope)
+
+  for scope in scopes:
+    warnings.extend(_CheckIncludeOrderForScope(scope, input_api, f.LocalPath(),
+                                               changed_linenums))
+  return warnings
+
+
+def _CheckIncludeOrder(input_api, output_api):
+  """Checks that the #include order is correct.
+
+  1. The corresponding header for source files.
+  2. C system files in alphabetical order
+  3. C++ system files in alphabetical order
+  4. Project's .h files in alphabetical order
+
+  Each region separated by #if, #elif, #else, #endif, #define and #undef follows
+  these rules separately.
+  """
+  def FileFilterIncludeOrder(affected_file):
+    black_list = (_EXCLUDED_PATHS + input_api.DEFAULT_BLACK_LIST)
+    return input_api.FilterSourceFile(affected_file, black_list=black_list)
+
+  warnings = []
+  for f in input_api.AffectedFiles(file_filter=FileFilterIncludeOrder):
+    if f.LocalPath().endswith(('.cc', '.h')):
+      changed_linenums = set(line_num for line_num, _ in f.ChangedContents())
+      warnings.extend(_CheckIncludeOrderInFile(input_api, f, changed_linenums))
+
+  results = []
+  if warnings:
+    results.append(output_api.PresubmitPromptOrNotify(_INCLUDE_ORDER_WARNING,
+                                                      warnings))
+  return results
+
+
+def _CheckForVersionControlConflictsInFile(input_api, f):
+  pattern = input_api.re.compile('^(?:<<<<<<<|>>>>>>>) |^=======$')
+  errors = []
+  for line_num, line in f.ChangedContents():
+    if pattern.match(line):
+      errors.append('    %s:%d %s' % (f.LocalPath(), line_num, line))
+  return errors
+
+
+def _CheckForVersionControlConflicts(input_api, output_api):
+  """Usually this is not intentional and will cause a compile failure."""
+  errors = []
+  for f in input_api.AffectedFiles():
+    errors.extend(_CheckForVersionControlConflictsInFile(input_api, f))
+
+  results = []
+  if errors:
+    results.append(output_api.PresubmitError(
+      'Version control conflict markers found, please resolve.', errors))
+  return results
+
+
+def _CheckHardcodedGoogleHostsInLowerLayers(input_api, output_api):
+  def FilterFile(affected_file):
+    """Filter function for use with input_api.AffectedSourceFiles,
+    below.  This filters out everything except non-test files from
+    top-level directories that generally speaking should not hard-code
+    service URLs (e.g. src/android_webview/, src/content/ and others).
+    """
+    return input_api.FilterSourceFile(
+      affected_file,
+      white_list=(r'^(android_webview|base|content|net)[\\\/].*', ),
+      black_list=(_EXCLUDED_PATHS +
+                  _TEST_CODE_EXCLUDED_PATHS +
+                  input_api.DEFAULT_BLACK_LIST))
+
+  base_pattern = '"[^"]*google\.com[^"]*"'
+  comment_pattern = input_api.re.compile('//.*%s' % base_pattern)
+  pattern = input_api.re.compile(base_pattern)
+  problems = []  # items are (filename, line_number, line)
+  for f in input_api.AffectedSourceFiles(FilterFile):
+    for line_num, line in f.ChangedContents():
+      if not comment_pattern.search(line) and pattern.search(line):
+        problems.append((f.LocalPath(), line_num, line))
+
+  if problems:
+    return [output_api.PresubmitPromptOrNotify(
+        'Most layers below src/chrome/ should not hardcode service URLs.\n'
+        'Are you sure this is correct?',
+        ['  %s:%d:  %s' % (
+            problem[0], problem[1], problem[2]) for problem in problems])]
+  else:
+    return []
+
+
+def _CheckNoAbbreviationInPngFileName(input_api, output_api):
+  """Makes sure there are no abbreviations in the name of PNG files.
+  """
+  pattern = input_api.re.compile(r'.*_[a-z]_.*\.png$|.*_[a-z]\.png$')
+  errors = []
+  for f in input_api.AffectedFiles(include_deletes=False):
+    if pattern.match(f.LocalPath()):
+      errors.append('    %s' % f.LocalPath())
+
+  results = []
+  if errors:
+    results.append(output_api.PresubmitError(
+        'The name of PNG files should not have abbreviations. \n'
+        'Use _hover.png, _center.png, instead of _h.png, _c.png.\n'
+        'Contact oshima@chromium.org if you have questions.', errors))
+  return results
+
+
+def _FilesToCheckForIncomingDeps(re, changed_lines):
+  """Helper method for _CheckAddedDepsHaveTargetApprovals. Returns
+  a set of DEPS entries that we should look up.
+
+  For a directory (rather than a specific filename) we fake a path to
+  a specific filename by adding /DEPS. This is chosen as a file that
+  will seldom or never be subject to per-file include_rules.
+  """
+  # We ignore deps entries on auto-generated directories.
+  AUTO_GENERATED_DIRS = ['grit', 'jni']
+
+  # This pattern grabs the path without basename in the first
+  # parentheses, and the basename (if present) in the second. It
+  # relies on the simple heuristic that if there is a basename it will
+  # be a header file ending in ".h".
+  pattern = re.compile(
+      r"""['"]\+([^'"]+?)(/[a-zA-Z0-9_]+\.h)?['"].*""")
+  results = set()
+  for changed_line in changed_lines:
+    m = pattern.match(changed_line)
+    if m:
+      path = m.group(1)
+      if path.split('/')[0] not in AUTO_GENERATED_DIRS:
+        if m.group(2):
+          results.add('%s%s' % (path, m.group(2)))
+        else:
+          results.add('%s/DEPS' % path)
+  return results
+
+
+def _CheckAddedDepsHaveTargetApprovals(input_api, output_api):
+  """When a dependency prefixed with + is added to a DEPS file, we
+  want to make sure that the change is reviewed by an OWNER of the
+  target file or directory, to avoid layering violations from being
+  introduced. This check verifies that this happens.
+  """
+  changed_lines = set()
+  for f in input_api.AffectedFiles():
+    filename = input_api.os_path.basename(f.LocalPath())
+    if filename == 'DEPS':
+      changed_lines |= set(line.strip()
+                           for line_num, line
+                           in f.ChangedContents())
+  if not changed_lines:
+    return []
+
+  virtual_depended_on_files = _FilesToCheckForIncomingDeps(input_api.re,
+                                                           changed_lines)
+  if not virtual_depended_on_files:
+    return []
+
+  if input_api.is_committing:
+    if input_api.tbr:
+      return [output_api.PresubmitNotifyResult(
+          '--tbr was specified, skipping OWNERS check for DEPS additions')]
+    if not input_api.change.issue:
+      return [output_api.PresubmitError(
+          "DEPS approval by OWNERS check failed: this change has "
+          "no Rietveld issue number, so we can't check it for approvals.")]
+    output = output_api.PresubmitError
+  else:
+    output = output_api.PresubmitNotifyResult
+
+  owners_db = input_api.owners_db
+  owner_email, reviewers = input_api.canned_checks._RietveldOwnerAndReviewers(
+      input_api,
+      owners_db.email_regexp,
+      approval_needed=input_api.is_committing)
+
+  owner_email = owner_email or input_api.change.author_email
+
+  reviewers_plus_owner = set(reviewers)
+  if owner_email:
+    reviewers_plus_owner.add(owner_email)
+  missing_files = owners_db.files_not_covered_by(virtual_depended_on_files,
+                                                 reviewers_plus_owner)
+
+  # We strip the /DEPS part that was added by
+  # _FilesToCheckForIncomingDeps to fake a path to a file in a
+  # directory.
+  def StripDeps(path):
+    start_deps = path.rfind('/DEPS')
+    if start_deps != -1:
+      return path[:start_deps]
+    else:
+      return path
+  unapproved_dependencies = ["'+%s'," % StripDeps(path)
+                             for path in missing_files]
+
+  if unapproved_dependencies:
+    output_list = [
+      output('Missing LGTM from OWNERS of dependencies added to DEPS:\n    %s' %
+             '\n    '.join(sorted(unapproved_dependencies)))]
+    if not input_api.is_committing:
+      suggested_owners = owners_db.reviewers_for(missing_files, owner_email)
+      output_list.append(output(
+          'Suggested missing target path OWNERS:\n    %s' %
+          '\n    '.join(suggested_owners or [])))
+    return output_list
+
+  return []
+
+
+def _CheckSpamLogging(input_api, output_api):
+  file_inclusion_pattern = r'.+%s' % _IMPLEMENTATION_EXTENSIONS
+  black_list = (_EXCLUDED_PATHS +
+                _TEST_CODE_EXCLUDED_PATHS +
+                input_api.DEFAULT_BLACK_LIST +
+                (r"^base[\\\/]logging\.h$",
+                 r"^base[\\\/]logging\.cc$",
+                 r"^chrome[\\\/]app[\\\/]chrome_main_delegate\.cc$",
+                 r"^chrome[\\\/]browser[\\\/]chrome_browser_main\.cc$",
+                 r"^chrome[\\\/]browser[\\\/]ui[\\\/]startup[\\\/]"
+                     r"startup_browser_creator\.cc$",
+                 r"^chrome[\\\/]installer[\\\/]setup[\\\/].*",
+                 r"chrome[\\\/]browser[\\\/]diagnostics[\\\/]" +
+                     r"diagnostics_writer\.cc$",
+                 r"^chrome_elf[\\\/]dll_hash[\\\/]dll_hash_main\.cc$",
+                 r"^chromecast[\\\/]",
+                 r"^cloud_print[\\\/]",
+                 r"^content[\\\/]common[\\\/]gpu[\\\/]client[\\\/]"
+                     r"gl_helper_benchmark\.cc$",
+                 r"^courgette[\\\/]courgette_tool\.cc$",
+                 r"^extensions[\\\/]renderer[\\\/]logging_native_handler\.cc$",
+                 r"^native_client_sdk[\\\/]",
+                 r"^remoting[\\\/]base[\\\/]logging\.h$",
+                 r"^remoting[\\\/]host[\\\/].*",
+                 r"^sandbox[\\\/]linux[\\\/].*",
+                 r"^tools[\\\/]",
+                 r"^ui[\\\/]aura[\\\/]bench[\\\/]bench_main\.cc$",
+                 r"^webkit[\\\/]browser[\\\/]fileapi[\\\/]" +
+                     r"dump_file_system.cc$",))
+  source_file_filter = lambda x: input_api.FilterSourceFile(
+      x, white_list=(file_inclusion_pattern,), black_list=black_list)
+
+  log_info = []
+  printf = []
+
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    contents = input_api.ReadFile(f, 'rb')
+    if re.search(r"\bD?LOG\s*\(\s*INFO\s*\)", contents):
+      log_info.append(f.LocalPath())
+    elif re.search(r"\bD?LOG_IF\s*\(\s*INFO\s*,", contents):
+      log_info.append(f.LocalPath())
+
+    if re.search(r"\bprintf\(", contents):
+      printf.append(f.LocalPath())
+    elif re.search(r"\bfprintf\((stdout|stderr)", contents):
+      printf.append(f.LocalPath())
+
+  if log_info:
+    return [output_api.PresubmitError(
+      'These files spam the console log with LOG(INFO):',
+      items=log_info)]
+  if printf:
+    return [output_api.PresubmitError(
+      'These files spam the console log with printf/fprintf:',
+      items=printf)]
+  return []
+
+
+def _CheckForAnonymousVariables(input_api, output_api):
+  """These types are all expected to hold locks while in scope and
+     so should never be anonymous (which causes them to be immediately
+     destroyed)."""
+  they_who_must_be_named = [
+    'base::AutoLock',
+    'base::AutoReset',
+    'base::AutoUnlock',
+    'SkAutoAlphaRestore',
+    'SkAutoBitmapShaderInstall',
+    'SkAutoBlitterChoose',
+    'SkAutoBounderCommit',
+    'SkAutoCallProc',
+    'SkAutoCanvasRestore',
+    'SkAutoCommentBlock',
+    'SkAutoDescriptor',
+    'SkAutoDisableDirectionCheck',
+    'SkAutoDisableOvalCheck',
+    'SkAutoFree',
+    'SkAutoGlyphCache',
+    'SkAutoHDC',
+    'SkAutoLockColors',
+    'SkAutoLockPixels',
+    'SkAutoMalloc',
+    'SkAutoMaskFreeImage',
+    'SkAutoMutexAcquire',
+    'SkAutoPathBoundsUpdate',
+    'SkAutoPDFRelease',
+    'SkAutoRasterClipValidate',
+    'SkAutoRef',
+    'SkAutoTime',
+    'SkAutoTrace',
+    'SkAutoUnref',
+  ]
+  anonymous = r'(%s)\s*[({]' % '|'.join(they_who_must_be_named)
+  # bad: base::AutoLock(lock.get());
+  # not bad: base::AutoLock lock(lock.get());
+  bad_pattern = input_api.re.compile(anonymous)
+  # good: new base::AutoLock(lock.get())
+  good_pattern = input_api.re.compile(r'\bnew\s*' + anonymous)
+  errors = []
+
+  for f in input_api.AffectedFiles():
+    if not f.LocalPath().endswith(('.cc', '.h', '.inl', '.m', '.mm')):
+      continue
+    for linenum, line in f.ChangedContents():
+      if bad_pattern.search(line) and not good_pattern.search(line):
+        errors.append('%s:%d' % (f.LocalPath(), linenum))
+
+  if errors:
+    return [output_api.PresubmitError(
+      'These lines create anonymous variables that need to be named:',
+      items=errors)]
+  return []
+
+
+def _CheckCygwinShell(input_api, output_api):
+  source_file_filter = lambda x: input_api.FilterSourceFile(
+      x, white_list=(r'.+\.(gyp|gypi)$',))
+  cygwin_shell = []
+
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    for linenum, line in f.ChangedContents():
+      if 'msvs_cygwin_shell' in line:
+        cygwin_shell.append(f.LocalPath())
+        break
+
+  if cygwin_shell:
+    return [output_api.PresubmitError(
+      'These files should not use msvs_cygwin_shell (the default is 0):',
+      items=cygwin_shell)]
+  return []
+
+
+def _CheckUserActionUpdate(input_api, output_api):
+  """Checks if any new user action has been added."""
+  if any('actions.xml' == input_api.os_path.basename(f) for f in
+         input_api.LocalPaths()):
+    # If actions.xml is already included in the changelist, the PRESUBMIT
+    # for actions.xml will do a more complete presubmit check.
+    return []
+
+  file_filter = lambda f: f.LocalPath().endswith(('.cc', '.mm'))
+  action_re = r'[^a-zA-Z]UserMetricsAction\("([^"]*)'
+  current_actions = None
+  for f in input_api.AffectedFiles(file_filter=file_filter):
+    for line_num, line in f.ChangedContents():
+      match = input_api.re.search(action_re, line)
+      if match:
+        # Loads contents in tools/metrics/actions/actions.xml to memory. It's
+        # loaded only once.
+        if not current_actions:
+          with open('tools/metrics/actions/actions.xml') as actions_f:
+            current_actions = actions_f.read()
+        # Search for the matched user action name in |current_actions|.
+        for action_name in match.groups():
+          action = 'name="{0}"'.format(action_name)
+          if action not in current_actions:
+            return [output_api.PresubmitPromptWarning(
+              'File %s line %d: %s is missing in '
+              'tools/metrics/actions/actions.xml. Please run '
+              'tools/metrics/actions/extract_actions.py to update.'
+              % (f.LocalPath(), line_num, action_name))]
+  return []
+
+
+def _GetJSONParseError(input_api, filename, eat_comments=True):
+  try:
+    contents = input_api.ReadFile(filename)
+    if eat_comments:
+      json_comment_eater = input_api.os_path.join(
+          input_api.PresubmitLocalPath(),
+          'tools', 'json_comment_eater', 'json_comment_eater.py')
+      process = input_api.subprocess.Popen(
+          [input_api.python_executable, json_comment_eater],
+          stdin=input_api.subprocess.PIPE,
+          stdout=input_api.subprocess.PIPE,
+          universal_newlines=True)
+      (contents, _) = process.communicate(input=contents)
+
+    input_api.json.loads(contents)
+  except ValueError as e:
+    return e
+  return None
+
+
+def _GetIDLParseError(input_api, filename):
+  try:
+    contents = input_api.ReadFile(filename)
+    idl_schema = input_api.os_path.join(
+        input_api.PresubmitLocalPath(),
+        'tools', 'json_schema_compiler', 'idl_schema.py')
+    process = input_api.subprocess.Popen(
+        [input_api.python_executable, idl_schema],
+        stdin=input_api.subprocess.PIPE,
+        stdout=input_api.subprocess.PIPE,
+        stderr=input_api.subprocess.PIPE,
+        universal_newlines=True)
+    (_, error) = process.communicate(input=contents)
+    return error or None
+  except ValueError as e:
+    return e
+
+
+def _CheckParseErrors(input_api, output_api):
+  """Check that IDL and JSON files do not contain syntax errors."""
+  actions = {
+    '.idl': _GetIDLParseError,
+    '.json': _GetJSONParseError,
+  }
+  # These paths contain test data and other known invalid JSON files.
+  excluded_patterns = [
+    r'test[\\\/]data[\\\/]',
+    r'^components[\\\/]policy[\\\/]resources[\\\/]policy_templates\.json$',
+  ]
+  # Most JSON files are preprocessed and support comments, but these do not.
+  json_no_comments_patterns = [
+    r'^testing[\\\/]',
+  ]
+  # Only run IDL checker on files in these directories.
+  idl_included_patterns = [
+    r'^chrome[\\\/]common[\\\/]extensions[\\\/]api[\\\/]',
+    r'^extensions[\\\/]common[\\\/]api[\\\/]',
+  ]
+
+  def get_action(affected_file):
+    filename = affected_file.LocalPath()
+    return actions.get(input_api.os_path.splitext(filename)[1])
+
+  def MatchesFile(patterns, path):
+    for pattern in patterns:
+      if input_api.re.search(pattern, path):
+        return True
+    return False
+
+  def FilterFile(affected_file):
+    action = get_action(affected_file)
+    if not action:
+      return False
+    path = affected_file.LocalPath()
+
+    if MatchesFile(excluded_patterns, path):
+      return False
+
+    if (action == _GetIDLParseError and
+        not MatchesFile(idl_included_patterns, path)):
+      return False
+    return True
+
+  results = []
+  for affected_file in input_api.AffectedFiles(
+      file_filter=FilterFile, include_deletes=False):
+    action = get_action(affected_file)
+    kwargs = {}
+    if (action == _GetJSONParseError and
+        MatchesFile(json_no_comments_patterns, affected_file.LocalPath())):
+      kwargs['eat_comments'] = False
+    parse_error = action(input_api,
+                         affected_file.AbsoluteLocalPath(),
+                         **kwargs)
+    if parse_error:
+      results.append(output_api.PresubmitError('%s could not be parsed: %s' %
+          (affected_file.LocalPath(), parse_error)))
+  return results
+
+
+def _CheckJavaStyle(input_api, output_api):
+  """Runs checkstyle on changed java files and returns errors if any exist."""
+  original_sys_path = sys.path
+  try:
+    sys.path = sys.path + [input_api.os_path.join(
+        input_api.PresubmitLocalPath(), 'tools', 'android', 'checkstyle')]
+    import checkstyle
+  finally:
+    # Restore sys.path to what it was before.
+    sys.path = original_sys_path
+
+  return checkstyle.RunCheckstyle(
+      input_api, output_api, 'tools/android/checkstyle/chromium-style-5.0.xml')
+
+
+_DEPRECATED_CSS = [
+  # Values
+  ( "-webkit-box", "flex" ),
+  ( "-webkit-inline-box", "inline-flex" ),
+  ( "-webkit-flex", "flex" ),
+  ( "-webkit-inline-flex", "inline-flex" ),
+  ( "-webkit-min-content", "min-content" ),
+  ( "-webkit-max-content", "max-content" ),
+
+  # Properties
+  ( "-webkit-background-clip", "background-clip" ),
+  ( "-webkit-background-origin", "background-origin" ),
+  ( "-webkit-background-size", "background-size" ),
+  ( "-webkit-box-shadow", "box-shadow" ),
+
+  # Functions
+  ( "-webkit-gradient", "gradient" ),
+  ( "-webkit-repeating-gradient", "repeating-gradient" ),
+  ( "-webkit-linear-gradient", "linear-gradient" ),
+  ( "-webkit-repeating-linear-gradient", "repeating-linear-gradient" ),
+  ( "-webkit-radial-gradient", "radial-gradient" ),
+  ( "-webkit-repeating-radial-gradient", "repeating-radial-gradient" ),
+]
+
+def _CheckNoDeprecatedCSS(input_api, output_api):
+  """ Make sure that we don't use deprecated CSS
+      properties, functions or values. Our external
+      documentation is ignored by the hooks as it
+      needs to be consumed by WebKit. """
+  results = []
+  file_inclusion_pattern = (r".+\.css$")
+  black_list = (_EXCLUDED_PATHS +
+                _TEST_CODE_EXCLUDED_PATHS +
+                input_api.DEFAULT_BLACK_LIST +
+                (r"^chrome/common/extensions/docs",
+                 r"^chrome/docs",
+                 r"^native_client_sdk"))
+  file_filter = lambda f: input_api.FilterSourceFile(
+      f, white_list=file_inclusion_pattern, black_list=black_list)
+  for fpath in input_api.AffectedFiles(file_filter=file_filter):
+    for line_num, line in fpath.ChangedContents():
+      for (deprecated_value, value) in _DEPRECATED_CSS:
+        if input_api.re.search(deprecated_value, line):
+          results.append(output_api.PresubmitError(
+              "%s:%d: Use of deprecated CSS %s, use %s instead" %
+              (fpath.LocalPath(), line_num, deprecated_value, value)))
+  return results
+
+def _CommonChecks(input_api, output_api):
+  """Checks common to both upload and commit."""
+  results = []
+  results.extend(input_api.canned_checks.PanProjectChecks(
+      input_api, output_api,
+      excluded_paths=_EXCLUDED_PATHS + _TESTRUNNER_PATHS))
+  results.extend(_CheckAuthorizedAuthor(input_api, output_api))
+  results.extend(
+      _CheckNoProductionCodeUsingTestOnlyFunctions(input_api, output_api))
+  results.extend(_CheckNoIOStreamInHeaders(input_api, output_api))
+  results.extend(_CheckNoUNIT_TESTInSourceFiles(input_api, output_api))
+  results.extend(_CheckNoNewWStrings(input_api, output_api))
+  results.extend(_CheckNoDEPSGIT(input_api, output_api))
+  results.extend(_CheckNoBannedFunctions(input_api, output_api))
+  results.extend(_CheckNoPragmaOnce(input_api, output_api))
+  results.extend(_CheckNoTrinaryTrueFalse(input_api, output_api))
+  results.extend(_CheckUnwantedDependencies(input_api, output_api))
+  results.extend(_CheckFilePermissions(input_api, output_api))
+  results.extend(_CheckNoAuraWindowPropertyHInHeaders(input_api, output_api))
+  results.extend(_CheckIncludeOrder(input_api, output_api))
+  results.extend(_CheckForVersionControlConflicts(input_api, output_api))
+  results.extend(_CheckPatchFiles(input_api, output_api))
+  results.extend(_CheckHardcodedGoogleHostsInLowerLayers(input_api, output_api))
+  results.extend(_CheckNoAbbreviationInPngFileName(input_api, output_api))
+  results.extend(_CheckForInvalidOSMacros(input_api, output_api))
+  results.extend(_CheckForInvalidIfDefinedMacros(input_api, output_api))
+  results.extend(_CheckAddedDepsHaveTargetApprovals(input_api, output_api))
+  results.extend(
+      input_api.canned_checks.CheckChangeHasNoTabs(
+          input_api,
+          output_api,
+          source_file_filter=lambda x: x.LocalPath().endswith('.grd')))
+  results.extend(_CheckSpamLogging(input_api, output_api))
+  results.extend(_CheckForAnonymousVariables(input_api, output_api))
+  results.extend(_CheckCygwinShell(input_api, output_api))
+  results.extend(_CheckUserActionUpdate(input_api, output_api))
+  results.extend(_CheckNoDeprecatedCSS(input_api, output_api))
+  results.extend(_CheckParseErrors(input_api, output_api))
+  results.extend(_CheckForIPCRules(input_api, output_api))
+
+  if any('PRESUBMIT.py' == f.LocalPath() for f in input_api.AffectedFiles()):
+    results.extend(input_api.canned_checks.RunUnitTestsInDirectory(
+        input_api, output_api,
+        input_api.PresubmitLocalPath(),
+        whitelist=[r'^PRESUBMIT_test\.py$']))
+  return results
+
+
+def _CheckAuthorizedAuthor(input_api, output_api):
+  """For non-googler/chromites committers, verify the author's email address is
+  in AUTHORS.
+  """
+  # TODO(maruel): Add it to input_api?
+  import fnmatch
+
+  author = input_api.change.author_email
+  if not author:
+    input_api.logging.info('No author, skipping AUTHOR check')
+    return []
+  authors_path = input_api.os_path.join(
+      input_api.PresubmitLocalPath(), 'AUTHORS')
+  valid_authors = (
+      input_api.re.match(r'[^#]+\s+\<(.+?)\>\s*$', line)
+      for line in open(authors_path))
+  valid_authors = [item.group(1).lower() for item in valid_authors if item]
+  if not any(fnmatch.fnmatch(author.lower(), valid) for valid in valid_authors):
+    input_api.logging.info('Valid authors are %s', ', '.join(valid_authors))
+    return [output_api.PresubmitPromptWarning(
+        ('%s is not in AUTHORS file. If you are a new contributor, please visit'
+        '\n'
+        'http://www.chromium.org/developers/contributing-code and read the '
+        '"Legal" section\n'
+        'If you are a chromite, verify the contributor signed the CLA.') %
+        author)]
+  return []
+
+
+def _CheckPatchFiles(input_api, output_api):
+  problems = [f.LocalPath() for f in input_api.AffectedFiles()
+      if f.LocalPath().endswith(('.orig', '.rej'))]
+  if problems:
+    return [output_api.PresubmitError(
+        "Don't commit .rej and .orig files.", problems)]
+  else:
+    return []
+
+
+def _DidYouMeanOSMacro(bad_macro):
+  try:
+    return {'A': 'OS_ANDROID',
+            'B': 'OS_BSD',
+            'C': 'OS_CHROMEOS',
+            'F': 'OS_FREEBSD',
+            'L': 'OS_LINUX',
+            'M': 'OS_MACOSX',
+            'N': 'OS_NACL',
+            'O': 'OS_OPENBSD',
+            'P': 'OS_POSIX',
+            'S': 'OS_SOLARIS',
+            'W': 'OS_WIN'}[bad_macro[3].upper()]
+  except KeyError:
+    return ''
+
+
+def _CheckForInvalidOSMacrosInFile(input_api, f):
+  """Check for sensible looking, totally invalid OS macros."""
+  preprocessor_statement = input_api.re.compile(r'^\s*#')
+  os_macro = input_api.re.compile(r'defined\((OS_[^)]+)\)')
+  results = []
+  for lnum, line in f.ChangedContents():
+    if preprocessor_statement.search(line):
+      for match in os_macro.finditer(line):
+        if not match.group(1) in _VALID_OS_MACROS:
+          good = _DidYouMeanOSMacro(match.group(1))
+          did_you_mean = ' (did you mean %s?)' % good if good else ''
+          results.append('    %s:%d %s%s' % (f.LocalPath(),
+                                             lnum,
+                                             match.group(1),
+                                             did_you_mean))
+  return results
+
+
+def _CheckForInvalidOSMacros(input_api, output_api):
+  """Check all affected files for invalid OS macros."""
+  bad_macros = []
+  for f in input_api.AffectedFiles():
+    if not f.LocalPath().endswith(('.py', '.js', '.html', '.css')):
+      bad_macros.extend(_CheckForInvalidOSMacrosInFile(input_api, f))
+
+  if not bad_macros:
+    return []
+
+  return [output_api.PresubmitError(
+      'Possibly invalid OS macro[s] found. Please fix your code\n'
+      'or add your macro to src/PRESUBMIT.py.', bad_macros)]
+
+
+def _CheckForInvalidIfDefinedMacrosInFile(input_api, f):
+  """Check all affected files for invalid "if defined" macros."""
+  ALWAYS_DEFINED_MACROS = (
+      "TARGET_CPU_PPC",
+      "TARGET_CPU_PPC64",
+      "TARGET_CPU_68K",
+      "TARGET_CPU_X86",
+      "TARGET_CPU_ARM",
+      "TARGET_CPU_MIPS",
+      "TARGET_CPU_SPARC",
+      "TARGET_CPU_ALPHA",
+      "TARGET_IPHONE_SIMULATOR",
+      "TARGET_OS_EMBEDDED",
+      "TARGET_OS_IPHONE",
+      "TARGET_OS_MAC",
+      "TARGET_OS_UNIX",
+      "TARGET_OS_WIN32",
+  )
+  ifdef_macro = input_api.re.compile(r'^\s*#.*(?:ifdef\s|defined\()([^\s\)]+)')
+  results = []
+  for lnum, line in f.ChangedContents():
+    for match in ifdef_macro.finditer(line):
+      if match.group(1) in ALWAYS_DEFINED_MACROS:
+        always_defined = ' %s is always defined. ' % match.group(1)
+        did_you_mean = 'Did you mean \'#if %s\'?' % match.group(1)
+        results.append('    %s:%d %s\n\t%s' % (f.LocalPath(),
+                                               lnum,
+                                               always_defined,
+                                               did_you_mean))
+  return results
+
+
+def _CheckForInvalidIfDefinedMacros(input_api, output_api):
+  """Check all affected files for invalid "if defined" macros."""
+  bad_macros = []
+  for f in input_api.AffectedFiles():
+    if f.LocalPath().endswith(('.h', '.c', '.cc', '.m', '.mm')):
+      bad_macros.extend(_CheckForInvalidIfDefinedMacrosInFile(input_api, f))
+
+  if not bad_macros:
+    return []
+
+  return [output_api.PresubmitError(
+      'Found ifdef check on always-defined macro[s]. Please fix your code\n'
+      'or check the list of ALWAYS_DEFINED_MACROS in src/PRESUBMIT.py.',
+      bad_macros)]
+
+
+def _CheckForIPCRules(input_api, output_api):
+  """Check for same IPC rules described in
+  http://www.chromium.org/Home/chromium-security/education/security-tips-for-ipc
+  """
+  base_pattern = r'IPC_ENUM_TRAITS\('
+  inclusion_pattern = input_api.re.compile(r'(%s)' % base_pattern)
+  comment_pattern = input_api.re.compile(r'//.*(%s)' % base_pattern)
+
+  problems = []
+  for f in input_api.AffectedSourceFiles(None):
+    local_path = f.LocalPath()
+    if not local_path.endswith('.h'):
+      continue
+    for line_number, line in f.ChangedContents():
+      if inclusion_pattern.search(line) and not comment_pattern.search(line):
+        problems.append(
+          '%s:%d\n    %s' % (local_path, line_number, line.strip()))
+
+  if problems:
+    return [output_api.PresubmitPromptWarning(
+        _IPC_ENUM_TRAITS_DEPRECATED, problems)]
+  else:
+    return []
+
+
+def CheckChangeOnUpload(input_api, output_api):
+  results = []
+  results.extend(_CommonChecks(input_api, output_api))
+  results.extend(_CheckValidHostsInDEPS(input_api, output_api))
+  results.extend(_CheckJavaStyle(input_api, output_api))
+  return results
+
+
+def GetTryServerMasterForBot(bot):
+  """Returns the Try Server master for the given bot.
+
+  It tries to guess the master from the bot name, but may still fail
+  and return None.  There is no longer a default master.
+  """
+  # Potentially ambiguous bot names are listed explicitly.
+  master_map = {
+      'linux_gpu': 'tryserver.chromium.gpu',
+      'mac_gpu': 'tryserver.chromium.gpu',
+      'win_gpu': 'tryserver.chromium.gpu',
+      'chromium_presubmit': 'tryserver.chromium.linux',
+      'blink_presubmit': 'tryserver.chromium.linux',
+      'tools_build_presubmit': 'tryserver.chromium.linux',
+  }
+  master = master_map.get(bot)
+  if not master:
+    if 'gpu' in bot:
+      master = 'tryserver.chromium.gpu'
+    elif 'linux' in bot or 'android' in bot or 'presubmit' in bot:
+      master = 'tryserver.chromium.linux'
+    elif 'win' in bot:
+      master = 'tryserver.chromium.win'
+    elif 'mac' in bot or 'ios' in bot:
+      master = 'tryserver.chromium.mac'
+  return master
+
+
+def GetDefaultTryConfigs(bots=None):
+  """Returns a list of ('bot', set(['tests']), optionally filtered by [bots].
+
+  To add tests to this list, they MUST be in the the corresponding master's
+  gatekeeper config. For example, anything on master.chromium would be closed by
+  tools/build/masters/master.chromium/master_gatekeeper_cfg.py.
+
+  If 'bots' is specified, will only return configurations for bots in that list.
+  """
+
+  standard_tests = [
+      'base_unittests',
+      'browser_tests',
+      'cacheinvalidation_unittests',
+      'check_deps',
+      'check_deps2git',
+      'content_browsertests',
+      'content_unittests',
+      'crypto_unittests',
+      'gpu_unittests',
+      'interactive_ui_tests',
+      'ipc_tests',
+      'jingle_unittests',
+      'media_unittests',
+      'net_unittests',
+      'ppapi_unittests',
+      'printing_unittests',
+      'sql_unittests',
+      'sync_unit_tests',
+      'unit_tests',
+      # Broken in release.
+      #'url_unittests',
+      #'webkit_unit_tests',
+  ]
+
+  builders_and_tests = {
+      # TODO(maruel): Figure out a way to run 'sizes' where people can
+      # effectively update the perf expectation correctly.  This requires a
+      # clobber=True build running 'sizes'. 'sizes' is not accurate with
+      # incremental build. Reference:
+      # http://chromium.org/developers/tree-sheriffs/perf-sheriffs.
+      # TODO(maruel): An option would be to run 'sizes' but not count a failure
+      # of this step as a try job failure.
+      'android_aosp': ['compile'],
+      'android_arm64_dbg_recipe': ['slave_steps'],
+      'android_chromium_gn_compile_dbg': ['compile'],
+      'android_chromium_gn_compile_rel': ['compile'],
+      'android_clang_dbg': ['slave_steps'],
+      'android_clang_dbg_recipe': ['slave_steps'],
+      'android_dbg_tests_recipe': ['slave_steps'],
+      'cros_x86': ['defaulttests'],
+      'ios_dbg_simulator': [
+          'compile',
+          'base_unittests',
+          'content_unittests',
+          'crypto_unittests',
+          'url_unittests',
+          'net_unittests',
+          'sql_unittests',
+          'ui_base_unittests',
+          'ui_unittests',
+      ],
+      'ios_rel_device': ['compile'],
+      'ios_rel_device_ninja': ['compile'],
+      'linux_asan': ['compile'],
+      'mac_asan': ['compile'],
+      #TODO(stip): Change the name of this builder to reflect that it's release.
+      'linux_gtk': standard_tests,
+      'linux_chromeos_asan': ['compile'],
+      'linux_chromium_chromeos_clang_dbg': ['defaulttests'],
+      'linux_chromium_chromeos_rel_swarming': ['defaulttests'],
+      'linux_chromium_compile_dbg': ['defaulttests'],
+      'linux_chromium_gn_dbg': ['compile'],
+      'linux_chromium_gn_rel': ['defaulttests'],
+      'linux_chromium_rel_swarming': ['defaulttests'],
+      'linux_chromium_clang_dbg': ['defaulttests'],
+      'linux_gpu': ['defaulttests'],
+      'linux_nacl_sdk_build': ['compile'],
+      'mac_chromium_compile_dbg': ['defaulttests'],
+      'mac_chromium_rel_swarming': ['defaulttests'],
+      'mac_gpu': ['defaulttests'],
+      'mac_nacl_sdk_build': ['compile'],
+      'win_chromium_compile_dbg': ['defaulttests'],
+      'win_chromium_dbg': ['defaulttests'],
+      'win_chromium_rel_swarming': ['defaulttests'],
+      'win_chromium_x64_rel_swarming': ['defaulttests'],
+      'win_gpu': ['defaulttests'],
+      'win_nacl_sdk_build': ['compile'],
+      'win8_chromium_rel': ['defaulttests'],
+  }
+
+  if bots:
+    filtered_builders_and_tests = dict((bot, set(builders_and_tests[bot]))
+                                       for bot in bots)
+  else:
+    filtered_builders_and_tests = dict(
+        (bot, set(tests))
+        for bot, tests in builders_and_tests.iteritems())
+
+  # Build up the mapping from tryserver master to bot/test.
+  out = dict()
+  for bot, tests in filtered_builders_and_tests.iteritems():
+    out.setdefault(GetTryServerMasterForBot(bot), {})[bot] = tests
+  return out
+
+
+def CheckChangeOnCommit(input_api, output_api):
+  results = []
+  results.extend(_CommonChecks(input_api, output_api))
+  # TODO(thestig) temporarily disabled, doesn't work in third_party/
+  #results.extend(input_api.canned_checks.CheckSvnModifiedDirectories(
+  #    input_api, output_api, sources))
+  # Make sure the tree is 'open'.
+  results.extend(input_api.canned_checks.CheckTreeIsOpen(
+      input_api,
+      output_api,
+      json_url='http://chromium-status.appspot.com/current?format=json'))
+
+  results.extend(input_api.canned_checks.CheckChangeHasBugField(
+      input_api, output_api))
+  results.extend(input_api.canned_checks.CheckChangeHasDescription(
+      input_api, output_api))
+  return results
+
+
+def GetPreferredTryMasters(project, change):
+  files = change.LocalPaths()
+
+  if not files or all(re.search(r'[\\\/]OWNERS$', f) for f in files):
+    return {}
+
+  if all(re.search(r'\.(m|mm)$|(^|[\\\/_])mac[\\\/_.]', f) for f in files):
+    return GetDefaultTryConfigs([
+        'mac_chromium_compile_dbg',
+        'mac_chromium_rel_swarming',
+    ])
+  if all(re.search('(^|[/_])win[/_.]', f) for f in files):
+    return GetDefaultTryConfigs([
+        'win_chromium_dbg',
+        'win_chromium_rel_swarming',
+        'win8_chromium_rel',
+    ])
+  if all(re.search(r'(^|[\\\/_])android[\\\/_.]', f) for f in files):
+    return GetDefaultTryConfigs([
+        'android_aosp',
+        'android_clang_dbg',
+        'android_dbg_tests_recipe',
+    ])
+  if all(re.search(r'[\\\/_]ios[\\\/_.]', f) for f in files):
+    return GetDefaultTryConfigs(['ios_rel_device', 'ios_dbg_simulator'])
+
+  builders = [
+      'android_arm64_dbg_recipe',
+      'android_chromium_gn_compile_rel',
+      'android_chromium_gn_compile_dbg',
+      'android_clang_dbg',
+      'android_clang_dbg_recipe',
+      'android_dbg_tests_recipe',
+      'ios_dbg_simulator',
+      'ios_rel_device',
+      'ios_rel_device_ninja',
+      'linux_chromium_chromeos_rel_swarming',
+      'linux_chromium_clang_dbg',
+      'linux_chromium_gn_dbg',
+      'linux_chromium_gn_rel',
+      'linux_chromium_rel_swarming',
+      'linux_gpu',
+      'mac_chromium_compile_dbg',
+      'mac_chromium_rel_swarming',
+      'mac_gpu',
+      'win_chromium_compile_dbg',
+      'win_chromium_rel_swarming',
+      'win_chromium_x64_rel_swarming',
+      'win_gpu',
+      'win8_chromium_rel',
+  ]
+
+  # Match things like path/aura/file.cc and path/file_aura.cc.
+  # Same for chromeos.
+  if any(re.search(r'[\\\/_](aura|chromeos)', f) for f in files):
+    builders.extend([
+        'linux_chromeos_asan',
+        'linux_chromium_chromeos_clang_dbg'
+    ])
+
+  # If there are gyp changes to base, build, or chromeos, run a full cros build
+  # in addition to the shorter linux_chromeos build. Changes to high level gyp
+  # files have a much higher chance of breaking the cros build, which is
+  # differnt from the linux_chromeos build that most chrome developers test
+  # with.
+  if any(re.search('^(base|build|chromeos).*\.gypi?$', f) for f in files):
+    builders.extend(['cros_x86'])
+
+  # The AOSP bot doesn't build the chrome/ layer, so ignore any changes to it
+  # unless they're .gyp(i) files as changes to those files can break the gyp
+  # step on that bot.
+  if (not all(re.search('^chrome', f) for f in files) or
+      any(re.search('\.gypi?$', f) for f in files)):
+    builders.extend(['android_aosp'])
+
+  return GetDefaultTryConfigs(builders)