Add --skip-try flag to autoroll script.

tools/autoroller/roll_chromium_revision.py

 #!/usr/bin/env python
 # Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 """Script to roll chromium_revision in the WebRTC DEPS file."""
@@ skipping 319 matching lines @@
     _RunCommand(['git', 'add', '--update', '.'])
     _RunCommand(['git', 'commit', '-m', commit_msg])
 
 
 def _UploadCL(dry_run):
   logging.info('Uploading CL...')
   if not dry_run:
     _RunCommand(['git', 'cl', 'upload'], extra_env={'EDITOR': 'true'})
 
 
-def _LaunchTrybots(dry_run):
+def _LaunchTrybots(dry_run, skip_try):
   logging.info('Sending tryjobs...')
-  if not dry_run:
+  if not dry_run and not skip_try:
     _RunCommand(['git', 'cl', 'try'])
 
 
 def main():
   p = argparse.ArgumentParser()
   p.add_argument('--clean', action='store_true', default=False,
                  help='Removes any previous local roll branch.')
   p.add_argument('-r', '--revision',
                  help=('Chromium Git revision to roll to. Defaults to the '
                        'Chromium LKGR revision if omitted.'))
   p.add_argument('--dry-run', action='store_true', default=False,
                  help=('Calculate changes and modify DEPS, but don\'t create '
                        'any local branch, commit, upload CL or send any '
                        'tryjobs.'))
+  p.add_argument('-s', '--skip-try', action='store_true', default=False,
+                 help='Do everything except sending tryjobs.')
   p.add_argument('-v', '--verbose', action='store_true', default=False,
                  help='Be extra verbose in printing of log messages.')
   opts = p.parse_args()
 
   if opts.verbose:
     logging.basicConfig(level=logging.DEBUG)
   else:
     logging.basicConfig(level=logging.INFO)
 
   if not _IsTreeClean():
@@ skipping 23 matching lines @@
     logging.debug('Commit message:\n%s', commit_msg)
   else:
     logging.info('No deps changes detected when rolling from %s to %s. '
                  'Aborting without action.', current_cr_rev, opts.revision)
     return 0
 
   _CreateRollBranch(opts.dry_run)
   UpdateDeps(deps_filename, current_cr_rev, opts.revision)
   _LocalCommit(commit_msg, opts.dry_run)
   _UploadCL(opts.dry_run)
-  _LaunchTrybots(opts.dry_run)
+  _LaunchTrybots(opts.dry_run, opts.skip_try)
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())