Cast:Adding cast_transport_config and cleaning up

media/cast/cast_environment.h

Index: media/cast/cast_environment.h
diff --git a/media/cast/cast_environment.h b/media/cast/cast_environment.h
index 8a135733c04ef3840242c4539b377ad65e175014..31e4f50f1caa3285ed3347b2e6e5ab9ca61bf524 100644
--- a/media/cast/cast_environment.h
+++ b/media/cast/cast_environment.h
@@ -34,6 +34,8 @@ class CastEnvironment : public base::RefCountedThreadSafe<CastEnvironment> {
     VIDEO_ENCODER,
     // The video decoder thread is where the video decode processing is done.
     VIDEO_DECODER,
+     // The transport thread is where the transport processing is done.
+    TRANSPORT,
   };
 
   CastEnvironment(base::TickClock* clock,
@@ -42,6 +44,7 @@ class CastEnvironment : public base::RefCountedThreadSafe<CastEnvironment> {
                   scoped_refptr<base::TaskRunner> audio_decode_thread_proxy,
                   scoped_refptr<base::TaskRunner> video_encode_thread_proxy,
                   scoped_refptr<base::TaskRunner> video_decode_thread_proxy,
+                  scoped_refptr<base::TaskRunner> transport_thread_proxy,
                   const CastLoggingConfig& config);
 
   // These are the same methods in message_loop.h, but are guaranteed to either
@@ -65,21 +68,22 @@ class CastEnvironment : public base::RefCountedThreadSafe<CastEnvironment> {
   // Logging is not thread safe. Should always be called from the main thread.
   LoggingImpl* Logging();
 
+  scoped_refptr<base::TaskRunner> GetMessageTaskRunnerForThread(
+      ThreadId identifier);
+
  protected:
   virtual ~CastEnvironment();
 
  private:
   friend class base::RefCountedThreadSafe<CastEnvironment>;
 
-  scoped_refptr<base::TaskRunner> GetMessageTaskRunnerForThread(
-      ThreadId identifier);
-
   base::TickClock* const clock_;  // Not owned by this class.
   scoped_refptr<base::TaskRunner> main_thread_proxy_;
   scoped_refptr<base::TaskRunner> audio_encode_thread_proxy_;
   scoped_refptr<base::TaskRunner> audio_decode_thread_proxy_;
   scoped_refptr<base::TaskRunner> video_encode_thread_proxy_;
   scoped_refptr<base::TaskRunner> video_decode_thread_proxy_;
+  scoped_refptr<base::TaskRunner> transport_thread_proxy_;
 
   scoped_ptr<LoggingImpl> logging_;