Add an heuristic for promoting canvases to GPU acceleration

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

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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.
@@ skipping 83 matching lines @@
   bool isExpensiveToPaint() const { return m_surface->isExpensiveToPaint(); }
   void prepareSurfaceForPaintingIfNeeded() {
     m_surface->prepareSurfaceForPaintingIfNeeded();
   }
   bool isSurfaceValid() const;
   bool restoreSurface() const;
   void didDraw(const FloatRect&) const;
   bool wasDrawnToAfterSnapshot() const {
     return m_snapshotState == DrawnToAfterSnapshot;
   }
-  void didDisableAcceleration() const;
 
   void setFilterQuality(SkFilterQuality filterQuality) {
     m_surface->setFilterQuality(filterQuality);
   }
   void setIsHidden(bool hidden) { m_surface->setIsHidden(hidden); }
 
   // Called by subclasses of ImageBufferSurface to install a new canvas object.
   // Virtual for mocking
   virtual void resetCanvas(SkCanvas*) const;
 
@@ skipping 60 matching lines @@
   void draw(GraphicsContext&, const FloatRect&, const FloatRect*, SkBlendMode);
 
   void updateGPUMemoryUsage() const;
   static intptr_t getGlobalGPUMemoryUsage() { return s_globalGPUMemoryUsage; }
   static unsigned getGlobalAcceleratedImageBufferCount() {
     return s_globalAcceleratedImageBufferCount;
   }
   intptr_t getGPUMemoryUsage() { return m_gpuMemoryUsage; }
 
   void disableAcceleration();
+  void setSurface(std::unique_ptr<ImageBufferSurface>);
 
   WeakPtrFactory<ImageBuffer> m_weakPtrFactory;
 
  protected:
   ImageBuffer(std::unique_ptr<ImageBufferSurface>);
 
  private:
   enum SnapshotState {
     InitialSnapshotState,
     DidAcquireSnapshot,
@@ skipping 22 matching lines @@
   int height() const { return m_size.height(); }
   int width() const { return m_size.width(); }
 
   const unsigned char* m_data;
   const IntSize m_size;
 };
 
 }  // namespace blink
 
 #endif  // ImageBuffer_h