Add presubmit check to prevent further changes to webrtc/base.

PRESUBMIT.py

 # Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import json
 import os
@@ skipping 492 matching lines @@
       files.append(f)
 
   if files:
     return [output_api.PresubmitError(
         'Please avoid to use namespace `google::protobuf` directly.\n'
         'Add a using directive in `%s` and include that header instead.'
         % proto_utils_path, files)]
   return []
 
 
+def _CheckNoChangesToWebRTCBase(input_api, output_api):
+  """Checks that no changes refer to webrtc/base."""
+  problems = []
+
+  for f in input_api.AffectedFiles():
+    if os.path.join('webrtc', 'base') in f.LocalPath():
+      problems.append('    ' + f.LocalPath())
+      continue
+    for line_num, line in f.ChangedContents():
+      if 'webrtc/base' in line:
+        problems.append('    %s: %s' % (f.LocalPath(), line_num))
+
+  return [output_api.PresubmitPromptWarning(
+      'webrtc/base is being moved to webrtc/rtc_base (See '
+      'bugs.webrtc.org/7634). Please refer to webrtc/rtc_base instead in the '
+      'following files:\n' + '\n'.join(problems))]
+
+
 def _CommonChecks(input_api, output_api):
   """Checks common to both upload and commit."""
   results = []
   # Filter out files that are in objc or ios dirs from being cpplint-ed since
   # they do not follow C++ lint rules.
   black_list = input_api.DEFAULT_BLACK_LIST + (
     r".*\bobjc[\\\/].*",
     r".*objc\.[hcm]+$",
     r"webrtc\/build\/ios\/SDK\/.*",
   )
@@ skipping 48 matching lines @@
   results.extend(_CheckNoIOStreamInHeaders(input_api, output_api))
   results.extend(_CheckNoPragmaOnce(input_api, output_api))
   results.extend(_CheckNoFRIEND_TEST(input_api, output_api))
   results.extend(_CheckGnChanges(input_api, output_api))
   results.extend(_CheckUnwantedDependencies(input_api, output_api))
   results.extend(_CheckJSONParseErrors(input_api, output_api))
   results.extend(_RunPythonTests(input_api, output_api))
   results.extend(_CheckUsageOfGoogleProtobufNamespace(input_api, output_api))
   results.extend(_CheckOrphanHeaders(input_api, output_api))
   results.extend(_CheckNewLineAtTheEndOfProtoFiles(input_api, output_api))
+  results.extend(_CheckNoChangesToWebRTCBase(input_api, output_api))
   return results
 
 
 def CheckChangeOnUpload(input_api, output_api):
   results = []
   results.extend(_CommonChecks(input_api, output_api))
   results.extend(
       input_api.canned_checks.CheckGNFormatted(input_api, output_api))
   return results
 
@@ skipping 50 matching lines @@
   results = []
   source_file_filter = lambda x: input_api.FilterSourceFile(
       x, white_list=(r'.+\.proto$',))
   for f in input_api.AffectedSourceFiles(source_file_filter):
     file_path = f.LocalPath()
     with open(file_path) as f:
       lines = f.readlines()
       if lines[-1] != '\n' or lines[-2] == '\n':
         results.append(output_api.PresubmitError(error_msg.format(file_path)))
   return results