Use gtest_filter syntax in jstest filter

run_jstests.py

 #!/usr/bin/env python
 # Copyright 2014 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 DomDistillers jstests.
 
 This uses ChromeDriver (https://sites.google.com/a/chromium.org/chromedriver/) to run the jstests.
 This requires that the ChromeDriver executable is on the PATH and that Selenium WebDriver is
 installed.
 
 In addition, ChromeDriver assumes that Chrome is available at /usr/bin/google-chrome.
 """
 
 import argparse
 import os
 import sys
 import time
 import urllib
 
 try:
   from selenium import webdriver
 except:
   print 'ERROR:'
   print 'Couldn\'t import webdriver. Please run `sudo ./install-build-deps.sh`.'
   sys.exit(1)
 
 def main(argv):
   parser = argparse.ArgumentParser()
-  parser.add_argument('--filter', help='Only tests that match this pattern will be run.')
+  parser.add_argument('--filter', help='See gtest_filter syntax.')
   parser.add_argument('--debug_level', help='Verbosity level of debug messages.')
   parser.add_argument('--no_console_log',
       action='store_true', help='Disable the console log output.')
   options = parser.parse_args(argv)
 
   params = {}
   if options.filter:
     params['filter'] = options.filter
 
   if options.debug_level:
@@ skipping 14 matching lines @@
 
   end = time.time()
   print result['log'].encode('utf-8')
   print 'Tests run: %d, Failures: %d, Skipped: %d, Time elapsed: %0.3f sec' % (result['numTests'],
       result['failed'], result['skipped'], end - start)
   return 0 if result['success'] else 1
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))