git-cl upload: Send mail when starting CQ

R=tandrii@chromium.org

Bug: 762009
Change-Id: I29a4ca06e0d29f5acb6c516d413fa2a35f8a5629
Reviewed-on: https://chromium-review.googlesource.com/661317
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Aaron Gable <agable@chromium.org>

git_cl.py

@@ -4887,7 +4887,8 @@ def CMDupload(parser, args):
                     dest="emulate_svn_auto_props",
                     help="Emulate Subversion's auto properties feature.")
   parser.add_option('-c', '--use-commit-queue', action='store_true',
-                    help='tell the commit queue to commit this patchset')
+                    help='tell the commit queue to commit this patchset; '
+                          'implies --send-mail')
   parser.add_option('--private', action='store_true',
                     help='set the review private (rietveld only)')
   parser.add_option('--target_branch',
@@ -4940,6 +4941,9 @@ def CMDupload(parser, args):
   if options.cq_dry_run and options.use_commit_queue:
     parser.error('only one of --use-commit-queue and --cq-dry-run allowed.')
 
+  if options.use_commit_queue:
+    options.send_mail = True
+
   # For sanity of test expectations, do this otherwise lazy-loading *now*.
   settings.GetIsGerrit()