Use refs for GraphicsContext

third_party/WebKit/Source/core/svg/graphics/SVGImageForContainer.cpp

 /*
  * Copyright (C) 2013 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 23 matching lines @@
     scaledContainerSize.scale(m_zoom);
     return roundedIntSize(scaledContainerSize);
 }
 
 void SVGImageForContainer::draw(SkCanvas* canvas, const SkPaint& paint, const FloatRect& dstRect,
     const FloatRect& srcRect, RespectImageOrientationEnum, ImageClampingMode)
 {
     m_image->drawForContainer(canvas, paint, m_containerSize, m_zoom, dstRect, srcRect, m_url);
 }
 
-void SVGImageForContainer::drawPattern(GraphicsContext* context, const FloatRect& srcRect, const FloatSize& scale,
+void SVGImageForContainer::drawPattern(GraphicsContext& context, const FloatRect& srcRect, const FloatSize& scale,
     const FloatPoint& phase, SkXfermode::Mode op, const FloatRect& dstRect, const FloatSize& repeatSpacing)
 {
     m_image->drawPatternForContainer(context, m_containerSize, m_zoom, srcRect, scale, phase, op, dstRect, repeatSpacing, m_url);
 }
 
 PassRefPtr<SkImage> SVGImageForContainer::imageForCurrentFrame()
 {
     return m_image->imageForCurrentFrameForContainer(m_url);
 }
 
 } // namespace blink