Document how effective zoom relates to StyleImage sizing

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 59 matching lines @@
     PassRefPtr<SkImage> imageForCurrentFrame() override;
 
     // Returns the SVG image document's frame.
     FrameView* frameView() const;
 
     // Does the SVG image/document contain any animations?
     bool hasAnimations() const;
 
     void updateUseCounters(Document&) const;
 
-    FloatSize concreteObjectSize(const FloatSize&) const;
+    // The defaultObjectSize is assumed to be unzoomed, i.e. it should
+    // not have the effective zoom level applied. The returned size is
+    // thus also independent of current zoom level.
+    FloatSize concreteObjectSize(const FloatSize& defaultObjectSize) const;
 
     // DisplayItemClient methods.
     String debugName() const final { return "SVGImage"; }
     LayoutRect visualRect() const override;
 
 private:
     friend class AXLayoutObject;
     friend class SVGImageChromeClient;
     friend class SVGImageForContainer;
 
@@ skipping 52 matching lines @@
         m_image->setImageObserver(m_observer);
     }
 private:
     Image* m_image;
     RawPtrWillBeMember<ImageObserver> m_observer;
 };
 
 } // namespace blink
 
 #endif // SVGImage_h