gclient: Add '--auto_rebase' sync option.

tests/gclient_scm_test.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 gclient_scm.py."""
 
 # pylint: disable=E1103
 
 # Import before super_mox to keep valid references.
@@ skipping 786 matching lines @@
     self.assertEquals(svn_scm.GetUsableRev(1, options), 1)
     # With an SVN checkout, a fake or unknown rev should raise an excpetion.
     self.assertRaises(gclient_scm.gclient_utils.Error,
                       svn_scm.GetUsableRev, 'fake', options)
 
 class BaseGitWrapperTestCase(GCBaseTestCase, StdoutCheck, TestCaseUtils,
                              unittest.TestCase):
   """This class doesn't use pymox."""
   class OptionsObject(object):
     def __init__(self, verbose=False, revision=None):
+      self.auto_rebase = False
       self.verbose = verbose
       self.revision = revision
       self.manually_grab_svn_rev = True
       self.deps_os = None
       self.force = False
       self.reset = False
       self.nohooks = False
       self.no_history = False
       self.upstream = False
       self.cache_dir = None
@@ skipping 801 matching lines @@
 
 if __name__ == '__main__':
   level = logging.DEBUG if '-v' in sys.argv else logging.FATAL
   logging.basicConfig(
       level=level,
       format='%(asctime).19s %(levelname)s %(filename)s:'
              '%(lineno)s %(message)s')
   unittest.main()
 
 # vim: ts=2:sw=2:tw=80:et: