Allow SVG images to not taint the canvas with drawImage/drawPattern

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 13 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef SVGImage_h
 #define SVGImage_h
 
 #include "core/platform/graphics/Image.h"
 
 namespace WebCore {
 
+class Element;
 class FrameView;
 class ImageBuffer;
 class Page;
 class RenderBox;
 class SVGImageChromeClient;
 class SVGImageForContainer;
 
 class SVGImage : public Image {
 public:
     static PassRefPtr<SVGImage> create(ImageObserver* observer)
     {
         return adoptRef(new SVGImage(observer));
     }
 
+    static bool isInSVGImage(const Element*);
+
     RenderBox* embeddedContentBox() const;
     FrameView* frameView() const;
 
     virtual bool isSVGImage() const OVERRIDE { return true; }
     virtual IntSize size() const OVERRIDE { return m_intrinsicSize; }
 
+    virtual bool hasSingleSecurityOrigin() const OVERRIDE;
+
     virtual bool hasRelativeWidth() const OVERRIDE;
     virtual bool hasRelativeHeight() const OVERRIDE;
 
     virtual void startAnimation(bool /*catchUpIfNecessary*/ = true) OVERRIDE;
     virtual void stopAnimation() OVERRIDE;
     virtual void resetAnimation() OVERRIDE;
 
     virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame() OVERRIDE;
 
 private:
@@ skipping 25 matching lines @@
     void drawPatternForContainer(GraphicsContext*, const FloatSize, float, const FloatRect&, const FloatSize&, const FloatPoint&,
         CompositeOperator, const FloatRect&, BlendMode);
 
     OwnPtr<SVGImageChromeClient> m_chromeClient;
     OwnPtr<Page> m_page;
     IntSize m_intrinsicSize;
 };
 }
 
 #endif // SVGImage_h