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 249 matching lines @@
           input_api,
           output_api,
           directory,
           whitelist=[r'.+_test\.py$']))
   return input_api.RunTests(tests, parallel=True)
 
 
 def _CommonChecks(input_api, output_api):
   """Checks common to both upload and commit."""
   results = []
-  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(input_api.canned_checks.RunPylint(input_api, output_api,
       black_list=(r'^.*gviz_api\.py$',
                   r'^.*gaeunit\.py$',
                   # Embedded shell-script fakes out pylint.
                   r'^build[\\\/].*\.py$',
                   r'^buildtools[\\\/].*\.py$',
                   r'^chromium[\\\/].*\.py$',
                   r'^google_apis[\\\/].*\.py$',
                   r'^net.*[\\\/].*\.py$',
                   r'^out.*[\\\/].*\.py$',
@@ skipping 86 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