Cast:Adding cast_transport_config and cleaning up

media/cast/cast_environment.cc

Index: media/cast/cast_environment.cc
diff --git a/media/cast/cast_environment.cc b/media/cast/cast_environment.cc
index 482534fe53b1ffe6494b39eb1cb97d3193fc0a3b..e7538abea457e4afa230fc4637fe9bd410c49929 100644
--- a/media/cast/cast_environment.cc
+++ b/media/cast/cast_environment.cc
@@ -18,6 +18,7 @@ CastEnvironment::CastEnvironment(
     scoped_refptr<TaskRunner> audio_decode_thread_proxy,
     scoped_refptr<TaskRunner> video_encode_thread_proxy,
     scoped_refptr<TaskRunner> video_decode_thread_proxy,
+    scoped_refptr<TaskRunner> transport_thread_proxy,
     const CastLoggingConfig& config)
     : clock_(clock),
       main_thread_proxy_(main_thread_proxy),
@@ -25,6 +26,7 @@ CastEnvironment::CastEnvironment(
       audio_decode_thread_proxy_(audio_decode_thread_proxy),
       video_encode_thread_proxy_(video_encode_thread_proxy),
       video_decode_thread_proxy_(video_decode_thread_proxy),
+      transport_thread_proxy_(transport_thread_proxy),
       logging_(new LoggingImpl(main_thread_proxy, config)) {
   DCHECK(main_thread_proxy) << "Main thread required";
 }
@@ -63,6 +65,8 @@ scoped_refptr<TaskRunner> CastEnvironment::GetMessageTaskRunnerForThread(
       return video_encode_thread_proxy_;
     case CastEnvironment::VIDEO_DECODER:
       return video_decode_thread_proxy_;
+    case CastEnvironment::TRANSPORT:
+      return transport_thread_proxy_;
     default:
       NOTREACHED() << "Invalid Thread identifier";
       return NULL;
@@ -81,6 +85,8 @@ bool CastEnvironment::CurrentlyOn(ThreadId identifier) {
       return video_encode_thread_proxy_->RunsTasksOnCurrentThread();
     case CastEnvironment::VIDEO_DECODER:
       return video_decode_thread_proxy_->RunsTasksOnCurrentThread();
+    case CastEnvironment::TRANSPORT:
+      return transport_thread_proxy_->RunsTasksOnCurrentThread();
     default:
       NOTREACHED() << "Invalid thread identifier";
       return false;