Forward all MediaSession callbacks to MediaSessionCompat

Adds missing callbacks to onCustomAction(), onPlayFromMediaId(), onSkipToQueueItem(), and onPlayFromSearch() in MediaSessionCompatApi21.CallbackProxy. This allows the support library callback registered via MediaSessionCompat.setCallback() to receive these callbacks.

BUG: 20129394
Change-Id: Ibef12730c0dd15932a47ba44d69e8f06e11c4db5
1 file changed