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

third_party/WebKit/Source/core/html/HTMLImageElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 569 matching lines @@
         return nullptr;
 
     return imageLoader().image()->image();
 }
 
 bool HTMLImageElement::isInteractiveContent() const
 {
     return fastHasAttribute(usemapAttr);
 }
 
-PassRefPtr<Image> HTMLImageElement::getSourceImageForCanvas(SourceImageStatus* status) const
+PassRefPtr<Image> HTMLImageElement::getSourceImageForCanvas(SourceImageStatus* status, AccelerationHint) const
 {
     if (!complete() || !cachedImage()) {
         *status = IncompleteSourceImageStatus;
         return nullptr;
     }
 
     if (cachedImage()->errorOccurred()) {
         *status = UndecodableSourceImageStatus;
         return nullptr;
     }
@@ skipping 158 matching lines @@
     ensureUserAgentShadowRoot();
 }
 
 bool HTMLImageElement::isOpaque() const
 {
     Image* image = const_cast<HTMLImageElement*>(this)->imageContents();
     return image && image->currentFrameKnownToBeOpaque();
 }
 
 }