Add support for the object-fit CSS property.

Source/core/loader/cache/CachedImage.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007 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
     version 2 of the License, or (at your option) any later version.
@@ skipping 47 matching lines @@
     std::pair<Image*, float> brokenImage(float deviceScaleFactor) const; // Returns an image and the image's resolution scale factor.
     bool willPaintBrokenImage() const;
 
     bool canRender(const RenderObject* renderer, float multiplier) { return !errorOccurred() && !imageSizeForRenderer(renderer, multiplier).isEmpty(); }
 
     void setContainerSizeForRenderer(const CachedImageClient*, const IntSize&, float);
     bool usesImageContainerSize() const;
     bool imageHasRelativeWidth() const;
     bool imageHasRelativeHeight() const;
 
+    enum SizeType {
+        NormalSize, // Report the size of the image associated with a certain renderer
+        IntrinsicSize // Report the intrinsic size, i.e. ignore whatever has been set extrinsically.
+    };
     // This method takes a zoom multiplier that can be used to increase the natural size of the image by the zoom.
-    LayoutSize imageSizeForRenderer(const RenderObject*, float multiplier); // returns the size of the complete image.
+    LayoutSize imageSizeForRenderer(const RenderObject*, float multiplier, SizeType = NormalSize); // returns the size of the complete image.
     void computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio);
 
     virtual void didAddClient(ResourceClient*);
     virtual void didRemoveClient(ResourceClient*);
 
     virtual void allClientsRemoved();
     virtual void destroyDecodedData();
 
     virtual void appendData(const char*, int) OVERRIDE;
     virtual void error(Resource::Status);
@@ skipping 31 matching lines @@
     ContainerSizeRequests m_pendingContainerSizeRequests;
 
     RefPtr<Image> m_image;
     OwnPtr<SVGImageCache> m_svgImageCache;
     bool m_loadingMultipartContent;
 };
 
 }
 
 #endif