Cast: Let the extension control if DSCP is on or off.

media/cast/test/simulator.cc

 // Copyright 2014 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.
 
 // Simulate end to end streaming.
 //
 // Input:
 // --source=
 //   WebM used as the source of video and audio frames.
 // --output=
@@ skipping 241 matching lines @@
                            audio_receiver_config,
                            video_receiver_config,
                            &receiver_to_sender));
 
   // Cast sender and transport sender.
   scoped_ptr<CastTransportSender> transport_sender(
       new CastTransportSenderImpl(
           NULL,
           &testing_clock,
           net::IPEndPoint(),
+          "",
           base::Bind(&UpdateCastTransportStatus),
           base::Bind(&LogTransportEvents, sender_env),
           base::TimeDelta::FromSeconds(1),
           task_runner,
           &sender_to_receiver));
   scoped_ptr<CastSender> cast_sender(
       CastSender::Create(sender_env, transport_sender.get()));
 
   // Build packet pipe.
   if (model.type() != media::cast::proto::INTERRUPTED_POISSON_PROCESS) {
@@ skipping 239 matching lines @@
   values.SetBoolean("sim", true);
   values.SetString("sim-id", sim_id);
 
   std::string extra_data;
   base::JSONWriter::Write(&values, &extra_data);
 
   // Run.
   media::cast::RunSimulation(source_path, output_path, extra_data, model);
   return 0;
 }