[chromedriver] Fixes for android tests gating chromedriver release.

chrome/test/chromedriver/run_buildbot_steps.py

 #!/usr/bin/env python
 # Copyright (c) 2013 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.
 
 """Runs all the buildbot steps for ChromeDriver except for update/compile."""
 
 import bisect
 import csv
 import datetime
@@ skipping 373 matching lines @@
   util.PrintAndFlush('Got snapshot revision %s' % snapshot_revision)
 
 
 def main():
   parser = optparse.OptionParser()
   parser.add_option(
       '', '--android-packages',
       help='Comma separated list of application package names, '
            'if running tests on Android.')
   parser.add_option(
-      '-r', '--revision', type='int', default=None,
-      help='Chromium revision')
+      '-r', '--revision', type='int', help='Chromium revision')
+  parser.add_option('', '--update-log', action='store_true',
+      help='Update the test results log (only applicable to Android)')
   options, _ = parser.parse_args()
 
   bitness = '32'
   if util.IsLinux() and platform_module.architecture()[0] == '64bit':
     bitness = '64'
   platform = '%s%s' % (util.GetPlatformName(), bitness)
   if options.android_packages:
     platform = 'android'
 
   if platform != 'android':
     KillChromes()
   CleanTmpDir()
 
   if platform == 'android':
+    if not options.revision and options.update_log:
+      parser.error('Must supply a --revision with --update-log')
     DownloadPrebuilts()
   else:
     if not options.revision:
       parser.error('Must supply a --revision')
-
     if platform == 'linux64':
       ArchivePrebuilts(options.revision)
 
     WaitForLatestSnapshot(options.revision)
 
   cmd = [
       sys.executable,
       os.path.join(_THIS_DIR, 'test', 'run_all_tests.py'),
   ]
   if platform == 'android':
     cmd.append('--android-packages=' + options.android_packages)
 
   passed = (util.RunCommand(cmd) == 0)
 
   if platform == 'android':
-    UpdateTestResultsLog(platform, options.revision, passed)
+    if options.update_log:
+      UpdateTestResultsLog(platform, options.revision, passed)
   elif passed:
     _MaybeUpdateReleaseCandidate(platform, options.revision)
     _MaybeRelease(platform)
 
 
 if __name__ == '__main__':
   main()