Adding CastRemotingSender for media remoting.

chrome/renderer/media/cast_session_delegate.h

Index: chrome/renderer/media/cast_session_delegate.h
diff --git a/chrome/renderer/media/cast_session_delegate.h b/chrome/renderer/media/cast_session_delegate.h
index 54cf520b5f29b6dca3b69c91dfd12c0c963146d2..596c437e28f6cadbb2347df35d3e786cfad892ac 100644
--- a/chrome/renderer/media/cast_session_delegate.h
+++ b/chrome/renderer/media/cast_session_delegate.h
@@ -116,6 +116,13 @@ class CastSessionDelegate : public CastSessionDelegateBase {
       const media::cast::CreateVideoEncodeMemoryCallback&
           create_video_encode_mem_cb);
 
+  // Start remoting session for one stream. After calling this method, a
+  // remoting sender will be ready for sending the demuxed stream. StartUDP()
+  // must be called before calling this method.
+  void StartRemotingStream(int32_t stream_id,
+                           const media::cast::FrameSenderConfig& config,
+                           const ErrorCallback& error_callback);
+
   void ToggleLogging(bool is_audio, bool enable);
   void GetEventLogsAndReset(bool is_audio,
       const std::string& extra_data, const EventLogsCallback& callback);