Bug 1143575. ScheduleStateMachine when the playback rate changes, so we can update the rendered frame queue. r=cpearce

--HG--
extra : commitid : 7gJKH1QbPSm
extra : rebase_source : db94d541ad1e55fe44f59b85e1b01ec1b1dd49fd

dom/media/MediaDecoderStateMachine.cpp

@@ -3013,6 +3013,8 @@ MediaDecoderStateMachine::LogicalPlaybackRateChanged()
   if (mAudioSink) {
     mAudioSink->SetPlaybackRate(mPlaybackRate);
   }
+
+  ScheduleStateMachine();
 }
 
 void MediaDecoderStateMachine::PreservesPitchChanged()