Add support for the object-fit CSS property.

Source/core/rendering/RenderImage.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2006 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple 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
@@ skipping 83 matching lines @@
     virtual LayoutUnit minimumReplacedHeight() const OVERRIDE;
 
     virtual void notifyFinished(Resource*) OVERRIDE FINAL;
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE FINAL;
 
     virtual bool boxShadowShouldBeAppliedToBackground(BackgroundBleedAvoidance, InlineFlowBox*) const OVERRIDE FINAL;
 
     IntSize imageSizeForError(CachedImage*) const;
     void imageDimensionsChanged(bool imageSizeChanged, const IntRect* = 0);
     bool updateIntrinsicSizeIfNeeded(const LayoutSize&, bool imageSizeChanged);
+    // Update the size of the image to be rendered. Object-fit may cause this to be different from the CSS box's content rect.
+    void updateInnerContentRect();
 
     void paintAreaElementFocusRing(PaintInfo&);
 
     // Text to display as long as the image isn't available.
     String m_altText;
     OwnPtr<RenderImageResource> m_imageResource;
     bool m_needsToSetSizeForAltText;
     bool m_didIncrementVisuallyNonEmptyPixelCount;
     bool m_isGeneratedContent;
 
@@ skipping 11 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderImage());
     return static_cast<const RenderImage*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderImage(const RenderImage*);
 
 } // namespace WebCore
 
 #endif // RenderImage_h