Bug 1093399. Fire UpdateReadyStateForData every time we get new data. r=cpearce

--HG--
extra : rebase_source : e243ecb8a72615cdf697228f30e631144cde129d

dom/media/MediaDecoder.cpp

@@ -1474,6 +1474,7 @@ void MediaDecoder::NotifyDataArrived(const char* aBuffer, uint32_t aLength, int6
   if (mDecoderStateMachine) {
     mDecoderStateMachine->NotifyDataArrived(aBuffer, aLength, aOffset);
   }
+  UpdateReadyStateForData();
 }
 
 void MediaDecoder::UpdatePlaybackPosition(int64_t aTime)