Port Skia recipe to normal Python scripts, move to Skia repo

PRESUBMIT.py

 # Copyright (c) 2013 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 Skia.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
@@ skipping 67 matching lines @@
   """Run checks on any modified Python files."""
   pylint_disabled_warnings = (
       'F0401',  # Unable to import.
       'E0611',  # No name in module.
       'W0232',  # Class has no __init__ method.
       'E1002',  # Use of super on an old style class.
       'W0403',  # Relative import used.
       'R0201',  # Method could be a function.
       'E1003',  # Using class name in super.
       'W0613',  # Unused argument.
+      'W0105',  # String statement has no effect.
   )
   # Run Pylint on only the modified python files. Unfortunately it still runs
   # Pylint on the whole file instead of just the modified lines.
   affected_python_files = []
   for affected_file in input_api.AffectedSourceFiles(None):
     affected_file_path = affected_file.LocalPath()
     if affected_file_path.endswith('.py'):
       affected_python_files.append(affected_file_path)
   return input_api.canned_checks.RunPylint(
       input_api, output_api,
@@ skipping 418 matching lines @@
     state and an error if it is in 'Closed' state.
   """
   results = []
   results.extend(_CommonChecks(input_api, output_api))
   results.extend(
       _CheckTreeStatus(input_api, output_api, json_url=(
           SKIA_TREE_STATUS_URL + '/banner-status?format=json')))
   results.extend(_CheckLGTMsForPublicAPI(input_api, output_api))
   results.extend(_CheckOwnerIsInAuthorsFile(input_api, output_api))
   return results