Implement interest rects for synchronized paint.

third_party/WebKit/Source/platform/graphics/GraphicsLayer.h

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 228 matching lines @@
     void setScrollableArea(ScrollableArea*, bool isViewport);
     ScrollableArea* scrollableArea() const { return m_scrollableArea; }
 
     WebContentLayer* contentLayer() const { return m_layer.get(); }
 
     static void registerContentsLayer(WebLayer*);
     static void unregisterContentsLayer(WebLayer*);
 
     // GraphicsContextPainter implementation.
     void paint(GraphicsContext&, const IntRect& clip) override;
+    void paintIfNeeded(GraphicsContext&) override;
 
     // WebCompositorAnimationDelegate implementation.
     void notifyAnimationStarted(double monotonicTime, int group) override;
     void notifyAnimationFinished(double monotonicTime, int group) override;
 
     // WebLayerScrollClient implementation.
     void didScroll() override;
 
     DisplayItemList* displayItemList() override;
 
@@ skipping 11 matching lines @@
 protected:
     String debugName(WebLayer*) const;
 
     explicit GraphicsLayer(GraphicsLayerClient*);
     // GraphicsLayerFactoryChromium that wants to create a GraphicsLayer need to be friends.
     friend class GraphicsLayerFactoryChromium;
     // for testing
     friend class FakeGraphicsLayerFactory;
 
 private:
-    // Callback from the underlying graphics system to draw layer contents.
-    void paintGraphicsLayerContents(GraphicsContext&, const IntRect& clip);
-
     // Sets m_needsDisplay, but without invalidating the DisplayItemList. This allows us to test
     // scenarios where paint needs to be re-calculated, but no DisplayItemClients were invalidated
     // (such as re-paints due to change of interest rect).
     void setNeedsDisplayWithoutInvalidateForTesting();
 
     // Adds a child without calling updateChildList(), so that adding children
     // can be batched before updating.
     void addChildInternal(GraphicsLayer*);
 
 #if ENABLE(ASSERT)
@@ skipping 90 matching lines @@
 };
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the blink namespace for ease of invocation from gdb.
 void PLATFORM_EXPORT showGraphicsLayerTree(const blink::GraphicsLayer*);
 #endif
 
 #endif // GraphicsLayer_h