Fix presubmit script for .cc files which include system files first.

PRESUBMIT.py

 # 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 depot_tools.
 """
 
@@ skipping 672 matching lines @@
   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
@@ skipping 64 matching lines @@
   # 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 uncheckable_includes_pattern.match(line):
+      continue
     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', '')
@@ skipping 1132 matching lines @@
   for master in masters:
     try_config.setdefault(master, {})
     for builder in masters[master]:
       # 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.
       if 'presubmit' not in builder:
         try_config[master][builder] = ['defaulttests']
 
   return try_config