Adding --skip-title option to git cl upload

Adding an optional --skip-title argument to git cl upload to
automatically use the latest commit message as the patch title, without
requiring the user to hit "enter" to accept.

Change-Id: I0e37b68c809d907a4f980f2be59865e14b1a2db2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2297803
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Mario Bianucci <mabian@microsoft.com>

git_cl.py

@@ -1373,7 +1373,7 @@ class Changelist(object):
 
     # Use the subject of the last commit as title by default.
     title = RunGit(['show', '-s', '--format=%s', 'HEAD']).strip()
-    if options.force:
+    if options.force or options.skip_title:
       return title
     user_title = gclient_utils.AskForData('Title for patchset [%s]: ' % title)
     return user_title or title
@@ -3989,6 +3989,10 @@ def CMDupload(parser, args):
                     help='file which contains message for patchset')
   parser.add_option('--title', '-t', dest='title',
                     help='title for patchset')
+  parser.add_option('-T', '--skip-title', action='store_true',
+                    dest='skip_title',
+                    help='Use the most recent commit message as the title of '
+                         'the patchset')
   parser.add_option('-r', '--reviewers',
                     action='append', default=[],
                     help='reviewer email addresses')
@@ -4096,6 +4100,9 @@ def CMDupload(parser, args):
     parser.error('Only one of --use-commit-queue, --cq-dry-run, or '
                  '--retry-failed is allowed.')
 
+  if options.skip_title and options.title:
+    parser.error('Only one of --title and --skip-title allowed.')
+
   if options.use_commit_queue:
     options.send_mail = True