Force offline by default for warm benchmarks.

mojo/devtools/common/mojo_benchmark

 #!/usr/bin/env python
 # Copyright 2015 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.
 
 """Runner for Mojo application benchmarks."""
 
 import argparse
 import logging
 import sys
@@ skipping 56 matching lines @@
         name.replace(' ', '_'),
         'cold_start' if cold_start else 'warm_start',
         time.strftime('%Y%m%d%H%M%S'))
     benchmark_args.append('--trace-output=' + trace_output_file)
 
   for measurement in measurements:
     benchmark_args.append(measurement)
 
   shell_args = list(shell_args)
   shell_args.append(_BENCHMARK_APP)
+  shell_args.append('--force-offline-by-default')
   shell_args.append('--args-for=%s %s' % (_BENCHMARK_APP,
                                           ' '.join(benchmark_args)))
 
   if cold_start:
     shell_args.append('--args-for=%s %s' % (_CACHE_SERVICE_URL, '--clear'))
     shell_args.append('--args-for=%s %s' % (_NETWORK_SERVICE_URL, '--clear'))
 
   if verbose:
     print 'shell arguments: ' + str(shell_args)
   print '[ %s ] %s' % (name, 'cold start' if cold_start else 'warm start')
@@ skipping 53 matching lines @@
                    cold_start=True, verbose=script_args.verbose,
                    save_traces=script_args.save_traces)
     _run_benchmark(shell, shell_args, name, app, duration, measurements,
                    cold_start=False, verbose=script_args.verbose,
                    save_traces=script_args.save_traces)
 
   return 0 if succeeded else 1
 
 if __name__ == '__main__':
   sys.exit(main())