Docserver: Persist stat cache for versioned file systems

chrome/common/extensions/docs/server2/github_file_system.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.
 
 import json
 import logging
 from StringIO import StringIO
 import posixpath
 
 from appengine_blobstore import AppEngineBlobstore, BLOBSTORE_GITHUB
@@ skipping 182 matching lines @@
     try:
       version = json.loads(result.content)['sha']
       self._stat_object_store.Set(path, version)
       return StatInfo(version)
     except StandardError as e:
       logging.warning(
           ('%s: got invalid or unexpected JSON from github. Response status ' +
            'was %s, content %s') % (e, result.status_code, result.content))
       return self._DefaultStat(path)
 
-  def GetIdentity(self):
+  def GetStableIdentity(self):
     return '%s@%s' % (self.__class__.__name__, StringIdentity(self._url))