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

R=rmistry@chromium.org,phajdan.jr@chromium.org
CC=machenbach@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1470943002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@297669 0039d316-1c4b-4281-b951-d872f2087c98

git_cl.py

@@ -2357,7 +2357,8 @@ def CMDupload(parser, args):
                     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',