In PatchIssue, add CL description to commit message

tests/git_cl_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 git_cl.py."""
 
 import os
 import StringIO
 import stat
@@ skipping 853 matching lines @@
     self.assertNotEqual(git_cl.main(['patch', '123456']), 0)
 
   def test_diff_when_dirty(self):
     # Do 'git cl diff' when local tree is dirty
     self.mock(git_common, 'is_dirty_git_tree', lambda x: True)
     self.assertNotEqual(git_cl.main(['diff']), 0)
 
   def _patch_common(self):
     self.mock(git_cl.Changelist, 'GetMostRecentPatchset', lambda x: '60001')
     self.mock(git_cl.Changelist, 'GetPatchSetDiff', lambda *args: None)
+    self.mock(git_cl.Changelist, 'GetDescription', lambda *args: 'Description')
     self.mock(git_cl.Changelist, 'SetIssue', lambda *args: None)
     self.mock(git_cl.Changelist, 'SetPatchset', lambda *args: None)
     self.mock(git_cl, 'IsGitVersionAtLeast', lambda *args: True)
 
     self.calls = [
       ((['git', 'config', 'rietveld.autoupdate'],), ''),
       ((['git', 'config', 'rietveld.server'],), 'codereview.example.com'),
       ((['git', 'rev-parse', '--show-cdup'],), ''),
       ((['sed', '-e', 's|^--- a/|--- |; s|^+++ b/|+++ |'],), ''),
     ]
 
   def test_patch_successful(self):
     self._patch_common()
     self.calls += [
       ((['git', 'apply', '--index', '-p0', '--3way'],), ''),
       ((['git', 'commit', '-m',
+         'Description\n\n' +
          'patch from issue 123456 at patchset 60001 ' +
          '(http://crrev.com/123456#ps60001)'],), ''),
     ]
     self.assertEqual(git_cl.main(['patch', '123456']), 0)
 
   def test_patch_conflict(self):
     self._patch_common()
     self.calls += [
       ((['git', 'apply', '--index', '-p0', '--3way'],), '',
        subprocess2.CalledProcessError(1, '', '', '', '')),
     ]
     self.assertNotEqual(git_cl.main(['patch', '123456']), 0)
 
 if __name__ == '__main__':
   git_cl.logging.basicConfig(
       level=git_cl.logging.DEBUG if '-v' in sys.argv else git_cl.logging.ERROR)
   unittest.main()