Create webrtc/base/objc and move some logging code there

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 280 matching lines @@
   long_lines_sources = lambda x: input_api.FilterSourceFile(x,
       black_list=(r'.+\.gyp$', r'.+\.gypi$', r'.+\.gn$', r'.+\.gni$', 'DEPS'))
   results.extend(input_api.canned_checks.CheckLongLines(
       input_api, output_api, maxlen=80, source_file_filter=long_lines_sources))
   results.extend(input_api.canned_checks.CheckChangeHasNoTabs(
       input_api, output_api))
   results.extend(input_api.canned_checks.CheckChangeHasNoStrayWhitespace(
       input_api, output_api))
   results.extend(input_api.canned_checks.CheckChangeTodoHasOwner(
       input_api, output_api))
-  results.extend(_CheckApprovedFilesLintClean(input_api, output_api))
+  # 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[\\\/].*",
+  )
+  source_file_filter = lambda x: input_api.FilterSourceFile(x, None, black_list)
+  results.extend(_CheckApprovedFilesLintClean(
+      input_api, output_api, source_file_filter))
   results.extend(_CheckNoIOStreamInHeaders(input_api, output_api))
   results.extend(_CheckNoFRIEND_TEST(input_api, output_api))
   results.extend(_CheckGypChanges(input_api, output_api))
   results.extend(_CheckUnwantedDependencies(input_api, output_api))
   results.extend(_RunPythonTests(input_api, output_api))
   return results
 
 
 def CheckChangeOnUpload(input_api, output_api):
   results = []
@@ skipping 37 matching lines @@
     for builder in masters[master]:
       if 'presubmit' in builder:
         # Do not trigger presubmit builders, since they're likely to fail
         # (e.g. OWNERS checks before finished code review), and we're running
         # local presubmit anyway.
         pass
       else:
         try_config[master][builder] = ['defaulttests']
 
   return try_config