Make 2D canvas smarter about chosing whether or not to use GPU acceleration

third_party/WebKit/Source/core/frame/ImageBitmap.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ImageBitmap_h
 #define ImageBitmap_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/html/HTMLImageElement.h"
@@ skipping 26 matching lines @@
 
     IntRect bitmapRect() const { return m_bitmapRect; }
 
     int width() const { return m_cropRect.width(); }
     int height() const { return m_cropRect.height(); }
     IntSize size() const { return m_cropRect.size(); }
 
     ~ImageBitmap() override;
 
     // CanvasImageSource implementation
-    PassRefPtr<Image> getSourceImageForCanvas(SourceImageStatus*) const override;
+    PassRefPtr<Image> getSourceImageForCanvas(SourceImageStatus*, AccelerationHint) const override;
     bool wouldTaintOrigin(SecurityOrigin*) const override { return false; }
     void adjustDrawRects(FloatRect* srcRect, FloatRect* dstRect) const override;
     FloatSize elementSize() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     ImageBitmap(HTMLImageElement*, const IntRect&);
     ImageBitmap(HTMLVideoElement*, const IntRect&);
     ImageBitmap(HTMLCanvasElement*, const IntRect&);
@@ skipping 16 matching lines @@
     // The offset by which the desired Image is stored internally.
     // ImageBitmaps constructed from HTMLImageElements reference the entire ImageResource and may have a non-zero bitmap offset.
     // ImageBitmaps not constructed from HTMLImageElements always pre-crop and store the image at (0, 0).
     IntPoint m_bitmapOffset;
 
 };
 
 } // namespace blink
 
 #endif // ImageBitmap_h