Add basic Gerrit support for presubmit_support.

tests/presubmit_unittest.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.
 
 """Unit tests for presubmit_support.py and presubmit_canned_checks.py."""
 
 # pylint: disable=E1101,E1103
 
 import StringIO
@@ skipping 165 matching lines @@
       'GitChange', 'InputApi', 'ListRelevantPresubmitFiles', 'main',
       'NonexistantCannedCheckFilter', 'OutputApi', 'ParseFiles',
       'PresubmitFailure', 'PresubmitExecuter', 'PresubmitOutput', 'ScanSubDirs',
       'SvnAffectedFile', 'SvnChange', 'auth', 'cPickle', 'cpplint', 'cStringIO',
       'contextlib', 'canned_check_filter', 'fix_encoding', 'fnmatch',
       'gclient_utils', 'glob', 'inspect', 'json', 'load_files', 'logging',
       'marshal', 'normpath', 'optparse', 'os', 'owners', 'pickle',
       'presubmit_canned_checks', 'random', 're', 'rietveld', 'scm',
       'subprocess', 'sys', 'tempfile', 'time', 'traceback', 'types', 'unittest',
       'urllib2', 'warn', 'multiprocessing', 'DoGetTryMasters',
-      'GetTryMastersExecuter', 'itertools',
+      'GetTryMastersExecuter', 'itertools', 'urlparse', 'gerrit_util',
     ]
     # If this test fails, you should add the relevant test.
     self.compareMembers(presubmit, members)
 
   def testCannedCheckFilter(self):
     canned = presubmit.presubmit_canned_checks
     orig = canned.CheckOwners
     with presubmit.canned_check_filter(['CheckOwners']):
       self.assertNotEqual(canned.CheckOwners, orig)
       self.assertEqual(canned.CheckOwners(None, None), [])
@@ skipping 2691 matching lines @@
         owners_check=False)
     self.assertEqual(2, len(results))
     self.assertEqual(
         'Found line ending with white spaces in:', results[0]._message)
     self.checkstdout('')
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()