Bug 1299415 - Clear ImageContainer cached resources When VideoSink pause playing r=jwwang

dom/media/VideoFrameContainer.cpp

@@ -294,6 +294,12 @@ void VideoFrameContainer::ClearFutureFrames()
   }
 }
 
+void
+VideoFrameContainer::ClearCachedResources()
+{
+  mImageContainer->ClearCachedResources();
+}
+
 ImageContainer* VideoFrameContainer::GetImageContainer() {
   return mImageContainer;
 }

dom/media/VideoFrameContainer.h

@@ -73,6 +73,9 @@ public:
   // but was actually painted at t+n, this returns n in seconds. Threadsafe.
   double GetFrameDelay();
 
+  // Clear any resources that are not immediately necessary.
+  void ClearCachedResources();
+
   // Returns a new frame ID for SetCurrentFrames().  The client must either
   // call this on only one thread or provide barriers.  Do not use together
   // with SetCurrentFrame().

dom/media/mediasink/VideoSink.cpp

@@ -145,6 +145,9 @@ VideoSink::SetPlaying(bool aPlaying)
     mUpdateScheduler.Reset();
     // Since playback is paused, tell compositor to render only current frame.
     RenderVideoFrames(1);
+    if (mContainer) {
+      mContainer->ClearCachedResources();
+    }
   }
 
   mAudioSink->SetPlaying(aPlaying);