Use the viewBox when scaling <svg:image>s non-uniformly w/ pAR=none

Source/platform/graphics/Image.h

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, 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 66 matching lines @@
     // image frame contains only resources from its own security origin.
     virtual bool currentFrameHasSingleSecurityOrigin() const { return false; }
 
     static Image* nullImage();
     bool isNull() const { return size().isEmpty(); }
 
     virtual void setContainerSize(const IntSize&) { }
     virtual bool usesContainerSize() const { return false; }
     virtual bool hasRelativeWidth() const { return false; }
     virtual bool hasRelativeHeight() const { return false; }
+
+    // Computes (extracts) the intrinsic dimensions and ratio from the Image. The intrinsic ratio
+    // will be the 'viewport' of the image. (Same as the dimensions for a raster image. For SVG
+    // images it can be the dimensions defined by the 'viewBox'.)
     virtual void computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio);
 
     virtual IntSize size() const = 0;
     IntRect rect() const { return IntRect(IntPoint(), size()); }
     int width() const { return size().width(); }
     int height() const { return size().height(); }
     virtual bool getHotSpot(IntPoint&) const { return false; }
 
     bool setData(PassRefPtr<SharedBuffer> data, bool allDataReceived);
     virtual bool dataChanged(bool /*allDataReceived*/) { return false; }
@@ skipping 52 matching lines @@
     RefPtr<SharedBuffer> m_encodedImageData;
     ImageObserver* m_imageObserver;
 };
 
 #define DEFINE_IMAGE_TYPE_CASTS(typeName) \
     DEFINE_TYPE_CASTS(typeName, Image, image, image->is##typeName(), image.is##typeName())
 
 } // namespace blink
 
 #endif