Create CachingRietveld to automatically cache results for presubmit checks.

presubmit_support.py

 #!/usr/bin/env python
 # 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.
 
 """Enables directory-specific presubmit checks to run at upload and/or commit.
 """
 
 __version__ = '1.6.1'
 
@@ skipping 1219 matching lines @@
   elif options.verbose:
     logging.basicConfig(level=logging.INFO)
   else:
     logging.basicConfig(level=logging.ERROR)
   change_class, files = load_files(options, args)
   if not change_class:
     parser.error('For unversioned directory, <files> is not optional.')
   logging.info('Found %d file(s).' % len(files))
   rietveld_obj = None
   if options.rietveld_url:
-    rietveld_obj = rietveld.Rietveld(
+    rietveld_obj = rietveld.CachingRietveld(
         options.rietveld_url,
         options.rietveld_email,
         options.rietveld_password)
   try:
     results = DoPresubmitChecks(
         change_class(options.name,
                     options.description,
                     options.root,
                     files,
                     options.issue,
@@ skipping 10 matching lines @@
   except PresubmitFailure, e:
     print >> sys.stderr, e
     print >> sys.stderr, 'Maybe your depot_tools is out of date?'
     print >> sys.stderr, 'If all fails, contact maruel@'
     return 2
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   sys.exit(Main(None))