Wrap CSS length conversion arguments in an object

Source/core/css/CSSToStyleMap.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google 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 11 matching lines @@
 #ifndef CSSToStyleMap_h
 #define CSSToStyleMap_h
 
 #include "CSSPropertyNames.h"
 #include "core/css/resolver/ElementStyleResources.h"
 #include "wtf/Noncopyable.h"
 
 namespace WebCore {
 
 class FillLayer;
+class CSSAnimationData;
+class CSSToLengthConversionData;
 class CSSValue;
-class CSSAnimationData;
 class RenderStyle;
 class StyleImage;
 class StyleResolverState;
 class NinePieceImage;
 class BorderImageLengthBox;
 
 // CSSToStyleMap is a short-lived helper object which
 // given the current StyleResolverState can map
 // CSSValue objects into their RenderStyle equivalents.
 
@@ skipping 24 matching lines @@
     void mapAnimationPlayState(CSSAnimationData*, CSSValue*) const;
     void mapAnimationProperty(CSSAnimationData*, CSSValue*) const;
     void mapAnimationTimingFunction(CSSAnimationData*, CSSValue*) const;
 
     void mapNinePieceImage(RenderStyle* mutableStyle, CSSPropertyID, CSSValue*, NinePieceImage&);
     void mapNinePieceImageSlice(CSSValue*, NinePieceImage&) const;
     BorderImageLengthBox mapNinePieceImageQuad(CSSValue*) const;
     void mapNinePieceImageRepeat(CSSValue*, NinePieceImage&) const;
 
 private:
-    const RenderStyle* style() const;
-    const RenderStyle* rootElementStyle() const;
+    const CSSToLengthConversionData& cssToLengthConversionData() const;
     bool useSVGZoomRules() const;
 
     PassRefPtr<StyleImage> styleImage(CSSPropertyID, CSSValue*);
 
     // FIXME: Consider passing a StyleResolverState (or ElementResolveState)
     // as an argument instead of caching it on this object.
     const StyleResolverState& m_state;
     ElementStyleResources& m_elementStyleResources;
 };
 
 }
 
 #endif