Asynchronous handling of remote volume updates

Remote playback information updates will be posted from the
 application thread, and sent to AudioService. Because they
 require locking the stack containing the remote playback
 information, the update should happen on AudioService's handler
 thread to avoid lock contention.

Change-Id: Ie04898295e08c16dd8ab5985fd825301e9cf1981

media/java/android/media/RemoteControlClient.java

@@ -1055,7 +1055,7 @@ public class RemoteControlClient
         if (mRcseId == RCSE_ID_UNREGISTERED) {
             return;
         }
-        Log.d(TAG, "sending to AudioService key=" + what + ", value=" + value);
+        //Log.d(TAG, "sending to AudioService key=" + what + ", value=" + value);
         IAudioService service = getService();
         try {
             service.setPlaybackInfoForRcc(mRcseId, what, value);