Bug 1199371 - Don't create TextureClients for video when the video isn't visible. r=nical

gfx/layers/ImageContainer.cpp

@@ -170,6 +170,7 @@ ImageContainer::ImageContainer(Mode flag)
 : mReentrantMonitor("ImageContainer.mReentrantMonitor"),
   mGenerationCounter(++sGenerationCounter),
   mPaintCount(0),
+  mAttachCount(0),
   mDroppedImageCount(0),
   mImageFactory(new ImageFactory()),
   mRecycleBin(new BufferRecycleBin()),
@@ -234,6 +235,28 @@ ImageContainer::CreateImage(ImageFormat aFormat)
   return mImageFactory->CreateImage(aFormat, mScaleHint, mRecycleBin);
 }
 
+void
+ImageContainer::NotifyAttached()
+{
+  ReentrantMonitorAutoEnter mon(mReentrantMonitor);
+  if (!mAttachCount++) {
+    if (IsAsync()) {
+      ImageBridgeChild::DispatchImageClientUpdate(mImageClient, this);
+    }
+  }
+}
+
+void
+ImageContainer::NotifyDetached()
+{
+  ReentrantMonitorAutoEnter mon(mReentrantMonitor);
+  if (!--mAttachCount) {
+    if (IsAsync()) {
+      ImageBridgeChild::FlushAllImagesAsync(mImageClient);
+    }
+  }
+}
+
 void
 ImageContainer::SetCurrentImageInternal(const nsTArray<NonOwningImage>& aImages)
 {