Bug 1325905. Part 5 - let DecodingFirstFrameState override Handle{Audio,Video}Waited. r=kaku

We want to call Request{Audio,Video}Data() instead of Ensure{Audio,Video}DecodeTaskQueued
which checks mState and breaks the encapsulation of the state objects.

MozReview-Commit-ID: 5oydItSvnMF

--HG--
extra : rebase_source : 5da4ad2f0fbf010a78c6b4e7cbab70378a002758
extra : intermediate-source : 0a882fb53fd51a71f9a3914074e9020d4eb87c4f
extra : source : 9927e37c9383e9204cbaf1b0dbc6fbfdff48df82

dom/media/MediaDecoderStateMachine.cpp

@@ -500,6 +500,16 @@ public:
   void HandleAudioNotDecoded(const MediaResult& aError) override;
   void HandleVideoNotDecoded(const MediaResult& aError) override;
 
+  void HandleAudioWaited(MediaData::Type aType) override
+  {
+    mMaster->RequestAudioData();
+  }
+
+  void HandleVideoWaited(MediaData::Type aType) override
+  {
+    mMaster->RequestVideoData(false, media::TimeUnit());
+  }
+
   void HandleVideoSuspendTimeout() override
   {
     // Do nothing for we need to decode the 1st video frame to get the dimensions.