Add an heuristic for promoting canvases to GPU acceleration

third_party/WebKit/Source/core/html/HTMLCanvasElement.h

 /*
  * Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * 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 220 matching lines @@
   String getIdFromControl(const Element*);
 
   // For OffscreenCanvas that controls this html canvas element
   CanvasSurfaceLayerBridge* surfaceLayerBridge() const {
     return m_surfaceLayerBridge.get();
   }
   void createLayer();
 
   void detachContext() { m_context = nullptr; }
 
+  void willDrawImageTo2DContext(CanvasImageSource*);
+
  protected:
   void didMoveToNewDocument(Document& oldDocument) override;
 
  private:
   explicit HTMLCanvasElement(Document&);
   void dispose();
 
   using ContextFactoryVector =
       Vector<std::unique_ptr<CanvasRenderingContextFactory>>;
   static ContextFactoryVector& renderingContextFactories();
   static CanvasRenderingContextFactory* getRenderingContextFactory(int);
 
-  bool shouldAccelerate(const IntSize&) const;
+  enum AccelerationCriteria {
+    NormalAccelerationCriteria,
+    IgnoreCanvasSizeAccelerationCriteria,
+  };
+  bool shouldAccelerate(AccelerationCriteria) const;
 
   void parseAttribute(const AttributeModificationParams&) override;
   LayoutObject* createLayoutObject(const ComputedStyle&) override;
   bool areAuthorShadowsAllowed() const override { return false; }
 
   void reset();
 
   std::unique_ptr<ImageBufferSurface> createWebGLImageBufferSurface(
-      const IntSize& deviceSize,
       OpacityMode);
   std::unique_ptr<ImageBufferSurface> createAcceleratedImageBufferSurface(
-      const IntSize& deviceSize,
       OpacityMode,
       int* msaaSampleCount);
   std::unique_ptr<ImageBufferSurface> createUnacceleratedImageBufferSurface(
-      const IntSize& deviceSize,
       OpacityMode);
   void createImageBuffer();
   void createImageBufferInternal(
       std::unique_ptr<ImageBufferSurface> externalSurface);
-  bool shouldUseDisplayList(const IntSize& deviceSize);
+  bool shouldUseDisplayList();
 
   void setSurfaceSize(const IntSize&);
 
   bool paintsIntoCanvasBuffer() const;
 
   ImageData* toImageData(SourceDrawingBuffer, SnapshotReason) const;
 
   String toDataURLInternal(const String& mimeType,
                            const double& quality,
                            SourceDrawingBuffer) const;
@@ skipping 24 matching lines @@
   // Used for OffscreenCanvas that controls this HTML canvas element
   std::unique_ptr<CanvasSurfaceLayerBridge> m_surfaceLayerBridge;
 
   int m_numFramesSinceLastRenderingModeSwitch;
   bool m_pendingRenderingModeSwitch;
 };
 
 }  // namespace blink
 
 #endif  // HTMLCanvasElement_h