Presubmit checks for user actions intorduced in HTML files.

tools/metrics/actions/extract_actions.py

 #!/usr/bin/env python
 #
 # 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.
 
 """Extract UserMetrics "actions" strings from the Chrome source.
 
 This program generates the list of known actions we expect to see in the
 user behavior logs.  It walks the Chrome source, looking for calls to
@@ skipping 488 matching lines @@
       parser.close()
 
 def WalkDirectory(root_path, actions, extensions, callback):
   for path, dirs, files in os.walk(root_path):
     if '.svn' in dirs:
       dirs.remove('.svn')
     if '.git' in dirs:
       dirs.remove('.git')
     for file in files:
       ext = os.path.splitext(file)[1]
-      if ext in extensions:
+      if ext and ext in extensions:

[Alexei Svitkine (slow), 2014/11/12 22:27:00]

This seems unrelated to the change you're making though. I suggest splitting to
a separate CL.

[gayane -on leave until 09-2017, 2014/11/15 00:09:09]

Done.

         callback(os.path.join(path, file), actions)
 
 def AddLiteralActions(actions):
   """Add literal actions specified via calls to UserMetrics functions.
 
   Arguments:
     actions: set of actions to add to.
   """
   EXTENSIONS = ('.cc', '.mm', '.c', '.m')
 
@@ skipping 293 matching lines @@
 
   with open(actions_xml_path, 'wb') as f:
     f.write(pretty)
   print ('Updated %s. Don\'t forget to add it to your changelist' %
          actions_xml_path)
   return 0
 
 
 if '__main__' == __name__:
   sys.exit(main(sys.argv))