Support revisions with str type for try jobs.

pending_manager.py

 # coding=utf8
 # 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.
 """Commit queue manager class.
 
 Security implications:
 
 The following hypothesis are made:
 - Commit queue:
@@ skipping 27 matching lines @@
   patchset = int
   description = unicode
   files = list
   # Only a cache, these values can be regenerated.
   owner = unicode
   reviewers = list
   base_url = unicode
   messages = list
   relpath = unicode
   # Only used after a patch was committed. Keeping here for try job retries.
-  revision = (None, int, unicode)
+  revision = (None, int, unicode, str)
 
   def __init__(self, **kwargs):
     super(PendingCommit, self).__init__(**kwargs)
     for message in self.messages:
       # Save storage, no verifier really need 'text', just 'approval'.
       if 'text' in message:
         del message['text']
 
   def pending_name(self):
     """The name that should be used for try jobs.
@@ skipping 483 matching lines @@
     """Loads the commit queue state from a JSON file."""
     self.queue = model.load_from_json_file(filename)
 
   def save(self, filename):
     """Save the commit queue state in a simple JSON file."""
     model.save_to_json_file(filename, self.queue)
 
   def close(self):
     """Close all the active pending manager items."""
     self.context.status.close()