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

media/cast/test/cast_benchmarks.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.
 //
 // This program benchmarks the theoretical throughput of the cast library.
 // It runs using a fake clock, simulated network and fake codecs. This allows
 // tests to run much faster than real time.
 // To run the program, run:
 // $ ./out/Release/cast_benchmarks | tee benchmarkoutput.asc
 // This may take a while, when it is done, you can view the data with
@@ skipping 284 matching lines @@
     cast_receiver_ = CastReceiver::Create(cast_environment_receiver_,
                                           audio_receiver_config_,
                                           video_receiver_config_,
                                           &receiver_to_sender_);
     net::IPEndPoint dummy_endpoint;
     transport_sender_.Init(
         new CastTransportSenderImpl(
             NULL,
             testing_clock_sender_,
             dummy_endpoint,
+            make_scoped_ptr(new base::DictionaryValue),
             base::Bind(&UpdateCastTransportStatus),
             base::Bind(&IgnoreRawEvents),
             base::TimeDelta::FromSeconds(1),
             task_runner_sender_,
             &sender_to_receiver_),
         &video_bytes_encoded_,
         &audio_bytes_encoded_);
 
     cast_sender_ =
         CastSender::Create(cast_environment_sender_, &transport_sender_);
@@ skipping 393 matching lines @@
   media::cast::CastBenchmark benchmark;
   if (getenv("PROFILE_FILE")) {
     std::string profile_file(getenv("PROFILE_FILE"));
     base::debug::StartProfiling(profile_file);
     benchmark.Run();
     base::debug::StopProfiling();
   } else {
     benchmark.Run();
   }
 }