Add shorter option -d for git cl upload --cq-dry-run.

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."""
 
 from distutils.version import LooseVersion
@@ skipping 2339 matching lines @@
                     '--target-branch',
                     metavar='TARGET',
                     help='Apply CL to remote ref TARGET.  ' +
                          'Default: remote branch head, or master')
   parser.add_option('--squash', action='store_true',
                     help='Squash multiple commits into one (Gerrit only)')
   parser.add_option('--email', default=None,
                     help='email address to use to connect to Rietveld')
   parser.add_option('--tbr-owners', dest='tbr_owners', action='store_true',
                     help='add a set of OWNERS to TBR')
-  parser.add_option('--cq-dry-run', dest='cq_dry_run', action='store_true',
+  parser.add_option('-d', '--cq-dry-run', dest='cq_dry_run',
+                    action='store_true',
                     help='Send the patchset to do a CQ dry run right after '
                          'upload.')
   parser.add_option('--dependencies', action='store_true',
                     help='Uploads CLs of all the local branches that depend on '
                          'the current branch')
 
   orig_args = args
   add_git_similarity(parser)
   auth.add_auth_options(parser)
   (options, args) = parser.parse_args(args)
@@ skipping 1299 matching lines @@
 if __name__ == '__main__':
   # These affect sys.stdout so do it outside of main() to simplify mocks in
   # unit testing.
   fix_encoding.fix_encoding()
   colorama.init()
   try:
     sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)