Add test for git-svn with submodule/merge layout.

git_cl.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.
 
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
 """A git-command for integrating reviews on Rietveld."""
 
 import json
@@ skipping 1127 matching lines @@
 
   if settings.GetIsGerrit():
     return GerritUpload(options, args, cl)
   return RietveldUpload(options, args, cl)
 
 
 def IsSubmoduleMergeCommit(ref):
   # When submodules are added to the repo, we expect there to be a single
   # non-git-svn merge commit at remote HEAD with a signature comment.
   pattern = '^SVN changes up to revision [0-9]*$'
-  cmd = ['rev-list', '--merges', '--grep="%s"' % pattern, '%s^!' % ref]
+  cmd = ['rev-list', '--merges', '--grep=%s' % pattern, '%s^!' % ref]
   return RunGit(cmd) != ''
 
 
 def SendUpstream(parser, args, cmd):
   """Common code for CmdPush and CmdDCommit
 
   Squashed commit into a single.
   Updates changelog with metadata (e.g. pointer to review).
   Pushes/dcommits the code upstream.
   Updates review and closes.
@@ skipping 441 matching lines @@
              'and retry or visit go/isgaeup.\n%s') % (e.code, str(e)))
 
   # Not a known command. Default to help.
   GenUsage(parser, 'help')
   return CMDhelp(parser, argv)
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   sys.exit(main(sys.argv[1:]))