PRESUBMIT check for JavaScript style errors

chrome/browser/resources/PRESUBMIT.py

 # Copyright (c) 2012 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.
 
 """Presubmit script for Chromium WebUI resources.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl/git cl, and see
 http://www.chromium.org/developers/web-development-style-guide for the rules
 we're checking against here.
@@ skipping 18 matching lines @@
   if presubmit in (f.AbsoluteLocalPath() for f in input_api.AffectedFiles()):
     tests = [path.join(resources, 'test_presubmit.py')]
     results.extend(
         input_api.canned_checks.RunUnitTests(input_api, output_api, tests))
 
   import sys
   old_path = sys.path
 
   try:
     sys.path.insert(0, resources)
-    from web_dev_style import css_checker
+    from web_dev_style import css_checker, js_checker
 
     # TODO(dbeam): Remove this filter eventually when ready.
     def file_filter(affected_file):
       dirs = (path.join(resources, 'ntp4'), path.join(resources, 'options2'))
       f = affected_file.AbsoluteLocalPath()
       return (f.startswith(dirs) and f.endswith(('.css', '.html', '.js')))
 
     results.extend(css_checker.CSSChecker(input_api, output_api,
                                           file_filter=file_filter).RunChecks())
+    results.extend(js_checker.JSChecker(input_api, output_api,
+                                        file_filter=file_filter).RunChecks())
   finally:
     sys.path = old_path
 
   return results