Wrap CSS length conversion arguments in an object

Source/core/animation/AnimatableLength.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 55 matching lines @@
     static PassRefPtr<AnimatableLength> create(CSSValue*);
     static PassRefPtr<AnimatableLength> create(double number, NumberUnitType unitType, CSSPrimitiveValue* cssPrimitiveValue = 0)
     {
         return adoptRef(new AnimatableLength(number, unitType, cssPrimitiveValue));
     }
     static PassRefPtr<AnimatableLength> create(PassRefPtr<CSSCalcExpressionNode> calcExpression, CSSPrimitiveValue* cssPrimitiveValue = 0)
     {
         return adoptRef(new AnimatableLength(calcExpression, cssPrimitiveValue));
     }
     PassRefPtr<CSSValue> toCSSValue(NumberRange = AllValues) const;
-    Length toLength(const RenderStyle* currStyle, const RenderStyle* rootStyle, double zoom, NumberRange = AllValues) const;
+    Length toLength(const CSSToLengthConversionData&, NumberRange = AllValues) const;
 
 protected:
     virtual PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const OVERRIDE;
     virtual PassRefPtr<AnimatableValue> addWith(const AnimatableValue*) const OVERRIDE;
 
 private:
     AnimatableLength(double number, NumberUnitType unitType, CSSPrimitiveValue* cssPrimitiveValue)
         : m_number(number)
         , m_unitType(unitType)
         , m_cachedCSSPrimitiveValue(cssPrimitiveValue)
@@ skipping 65 matching lines @@
     mutable RefPtr<CSSPrimitiveValue> m_cachedCSSPrimitiveValue;
 
     friend class AnimationAnimatableLengthTest;
 };
 
 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableLength, isLength());
 
 } // namespace WebCore
 
 #endif // AnimatableLength_h