Use refs for GraphicsContext

third_party/WebKit/Source/core/svg/graphics/SVGImage.h

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Apple Inc. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 87 matching lines @@
     // FIXME: SVGImages are underreporting decoded sizes and will be unable
     // to prune because these functions are not implemented yet.
     void destroyDecodedData(bool) override { }
 
     // FIXME: Implement this to be less conservative.
     bool currentFrameKnownToBeOpaque(MetadataMode = UseCurrentMetadata) override { return false; }
 
     SVGImage(ImageObserver*);
     void draw(SkCanvas*, const SkPaint&, const FloatRect& fromRect, const FloatRect& toRect, RespectImageOrientationEnum, ImageClampingMode) override;
     void drawForContainer(SkCanvas*, const SkPaint&, const FloatSize, float, const FloatRect&, const FloatRect&, const KURL&);
-    void drawPatternForContainer(GraphicsContext*, const FloatSize, float, const FloatRect&, const FloatSize&, const FloatPoint&,
+    void drawPatternForContainer(GraphicsContext&, const FloatSize, float, const FloatRect&, const FloatSize&, const FloatPoint&,
         SkXfermode::Mode, const FloatRect&, const FloatSize& repeatSpacing, const KURL&);
     PassRefPtr<SkImage> imageForCurrentFrameForContainer(const KURL&);
     void drawInternal(SkCanvas*, const SkPaint&, const FloatRect& fromRect, const FloatRect& toRect, RespectImageOrientationEnum,
         ImageClampingMode, const KURL&);
 
     OwnPtrWillBePersistent<SVGImageChromeClient> m_chromeClient;
     OwnPtrWillBePersistent<Page> m_page;
     IntSize m_intrinsicSize;
 };
 
@@ skipping 15 matching lines @@
         m_image->setImageObserver(m_observer);
     }
 private:
     Image* m_image;
     ImageObserver* m_observer;
 };
 
 }
 
 #endif // SVGImage_h