Protocol plumbing for audio toggle.

remoting/protocol/host_control_dispatcher.cc

Index: remoting/protocol/host_control_dispatcher.cc
diff --git a/remoting/protocol/host_control_dispatcher.cc b/remoting/protocol/host_control_dispatcher.cc
index ac6d80fe71e13a8618776b90abdd076f09dbf3b2..2dc83afb4af9dc7fdda6f3ec1356bc1bb47b2a97 100644
--- a/remoting/protocol/host_control_dispatcher.cc
+++ b/remoting/protocol/host_control_dispatcher.cc
@@ -58,6 +58,8 @@ void HostControlDispatcher::OnMessageReceived(
     host_stub_->NotifyClientDimensions(message->client_dimensions());
   } else if (message->has_video_control()) {
     host_stub_->ControlVideo(message->video_control());
+  } else if (message->has_audio_control()) {
+    host_stub_->ControlAudio(message->audio_control());
   } else {
     LOG(WARNING) << "Unknown control message received.";
   }