sandwich: Fix some trivial failures on SWR benchmark runs

tools/android/loading/sandwich_utils.py

 # Copyright 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.
 
 import os
 
 import common_util
 import emulation
 import sandwich_runner
 import task_manager
@@ skipping 17 matching lines @@
 
 
 def FilterOutDataAndIncompleteRequests(requests):
   for request in filter(lambda r: not r.IsDataRequest(), requests):
     # The protocol is only known once the response has been received. But the
     # trace recording might have been stopped with still some JavaScript
     # originated requests that have not received any responses yet.
     if request.protocol is None:
       assert not request.HasReceivedResponse()
       continue
+    if request.protocol in {'about'}:
+      continue
     if request.protocol not in {'http/0.9', 'http/1.0', 'http/1.1'}:
       raise RuntimeError('Unknown request protocol {}'.format(request.protocol))
     yield request
 
 
 class RequestOutcome:
   All, ServedFromCache, NotServedFromCache, Post = range(4)
 
 
 def ListUrlRequests(trace, request_kind):
@@ skipping 94 matching lines @@
       runner = self.CreateSandwichRunner()
       runner.wpr_archive_path = BuildOriginalWpr.path
       runner.wpr_record = True
       runner.output_dir = BuildOriginalWpr.run_path
       runner.Run()
     BuildOriginalWpr.run_path = BuildOriginalWpr.path[:-4] + '-run'
 
     self.original_wpr_task = BuildOriginalWpr
     self.original_wpr_recording_trace_path = os.path.join(
         BuildOriginalWpr.run_path, '0', sandwich_runner.TRACE_FILENAME)