Remove native_client_sdk from the PNG presubmit check

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 gcl.
 """
 
@@ skipping 844 matching lines @@
         '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.
+  The native_client_sdk directory is excluded because it has auto-generated PNG
+  files for documentation.
   """
-  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())
+  white_list = (r'.*_[a-z]_.*\.png$|.*_[a-z]\.png$',)
+  black_list = (r'^native_client_sdk[\\\/]',)
+  file_filter = lambda f: input_api.FilterSourceFile(
+      f, white_list=white_list, black_list=black_list)
+  for f in input_api.AffectedFiles(include_deletes=False,
+                                   file_filter=file_filter):
+    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
 
 
@@ skipping 904 matching lines @@
   ]
 
   # 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',
     ])
 
   return GetDefaultTryConfigs(builders)