add GCS support to docs server

chrome/common/extensions/docs/server2/app_engine_handler.py

 # Copyright 2013 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 logging
 
 from appengine_wrappers import webapp2
 from handler import Handler
 from servlet import Request
 
@@ skipping 25 matching lines @@
         pstats.Stats(pr, stream=s).sort_stats(profile_mode).print_stats()
         self.response.out.write(s.getvalue())
         self.response.headers['Content-Type'] = 'text/plain'
         self.response.status = 200
       elif response:
         self.response.out.write(response.content.ToString())
         self.response.headers.update(response.headers)
         self.response.status = response.status
       else:
         self.response.out.write('Internal server error')
-        self.response.status = 500
+        self.response.status = 500