sandwich: Use cachetool's batch mode to speed-up cache processing.

tools/android/loading/request_track.py

 # Copyright (c) 2016 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.
 
 """The request data track.
 
 When executed, parses a JSON dump of DevTools messages.
 """
 
 import bisect
@@ skipping 798 matching lines @@
     r.data_chunks.append((offset, params['encodedDataLength']))
     self._requests_in_flight[request_id] = (r, RequestTrack._STATUS_DATA)
 
   def _LoadingFinished(self, request_id, params):
     if request_id not in self._requests_in_flight:
       return
     (r, status) = self._requests_in_flight[request_id]
     assert (status == RequestTrack._STATUS_RESPONSE
             or status == RequestTrack._STATUS_DATA)
     r.encoded_data_length = params['encodedDataLength']
-    assert (r.encoded_data_length > 0 or r.protocol == 'about' or
+    assert (r.encoded_data_length > 0 or r.protocol in {'about', 'blob'} or
             r.from_disk_cache or r.served_from_cache)
     r.timing.loading_finished = r._TimestampOffsetFromStartMs(
         params['timestamp'])
     self._requests_in_flight[request_id] = (r, RequestTrack._STATUS_FINISHED)
     self._FinalizeRequest(request_id)
 
   def _LoadingFailed(self, request_id, params):
     if request_id not in self._requests_in_flight:
       logging.warning('An unknown request failed: %s' % request_id)
       return
@@ skipping 32 matching lines @@
 
 
 if __name__ == '__main__':
   import json
   import sys
   events = json.load(open(sys.argv[1], 'r'))
   request_track = RequestTrack(None)
   for event in events:
     event_method = event['method']
     request_track.Handle(event_method, event)