CSSValue Immediates: Replace CSSPrimitiveValue usage with const references

Source/core/animation/StringKeyframe.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef StringKeyframe_h
 #define StringKeyframe_h
 
 #include "core/animation/Keyframe.h"
 #include "core/css/StylePropertySet.h"
 
@@ skipping 23 matching lines @@
     {
         return m_svgPropertyMap.get(&attributeName);
     }
 
     virtual PropertyHandleSet properties() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
     class CSSPropertySpecificKeyframe : public Keyframe::PropertySpecificKeyframe {
     public:
-        CSSPropertySpecificKeyframe(double offset, PassRefPtr<TimingFunction> easing, NullableCSSValue, EffectModel::CompositeOperation);
+        CSSPropertySpecificKeyframe(double offset, PassRefPtr<TimingFunction> easing, const NullableCSSValue&, EffectModel::CompositeOperation);
 
-        NullableCSSValue value() const { return m_value; }
+        const NullableCSSValue& value() const { return m_value; }
 
         virtual void populateAnimatableValue(CSSPropertyID, Element&, const ComputedStyle* baseStyle) const;
         virtual const PassRefPtrWillBeRawPtr<AnimatableValue> getAnimatableValue() const override final { return m_animatableValueCache.get(); }
         void setAnimatableValue(PassRefPtrWillBeRawPtr<AnimatableValue> value) { m_animatableValueCache = value; }
 
         virtual PassOwnPtrWillBeRawPtr<Keyframe::PropertySpecificKeyframe> neutralKeyframe(double offset, PassRefPtr<TimingFunction> easing) const override final;
         virtual PassRefPtrWillBeRawPtr<Interpolation> maybeCreateInterpolation(PropertyHandle, Keyframe::PropertySpecificKeyframe& end, Element*, const ComputedStyle* baseStyle) const override final;
 
         DECLARE_VIRTUAL_TRACE();
 
     private:
-        CSSPropertySpecificKeyframe(double offset, PassRefPtr<TimingFunction> easing, NullableCSSValue);
+        CSSPropertySpecificKeyframe(double offset, PassRefPtr<TimingFunction> easing, const NullableCSSValue&);
 
         virtual PassOwnPtrWillBeRawPtr<Keyframe::PropertySpecificKeyframe> cloneWithOffset(double offset) const;
         virtual bool isCSSPropertySpecificKeyframe() const override { return true; }
 
-        static bool createInterpolationsFromCSSValues(CSSPropertyID, CSSValue fromCSSValue, CSSValue toCSSValue, Element*, OwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation>>>& interpolations);
+        static bool createInterpolationsFromCSSValues(CSSPropertyID, const CSSValue& fromCSSValue, const CSSValue& toCSSValue, Element*, OwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation>>>& interpolations);
 
-        void populateAnimatableValueCaches(CSSPropertyID, Keyframe::PropertySpecificKeyframe&, Element*, CSSValue& fromCSSValue, CSSValue& toCSSValue) const;
+        void populateAnimatableValueCaches(CSSPropertyID, Keyframe::PropertySpecificKeyframe&, Element*, const CSSValue& fromCSSValue, const CSSValue& toCSSValue) const;
 
         NullableCSSValue m_value;
         mutable RefPtrWillBeMember<AnimatableValue> m_animatableValueCache;
     };
 
     class SVGPropertySpecificKeyframe : public Keyframe::PropertySpecificKeyframe {
     public:
         SVGPropertySpecificKeyframe(double offset, PassRefPtr<TimingFunction> easing, const String&, EffectModel::CompositeOperation);
 
         const String& value() const { return m_value; }
@@ skipping 34 matching lines @@
 using CSSPropertySpecificKeyframe = StringKeyframe::CSSPropertySpecificKeyframe;
 using SVGPropertySpecificKeyframe = StringKeyframe::SVGPropertySpecificKeyframe;
 
 DEFINE_TYPE_CASTS(StringKeyframe, Keyframe, value, value->isStringKeyframe(), value.isStringKeyframe());
 DEFINE_TYPE_CASTS(CSSPropertySpecificKeyframe, Keyframe::PropertySpecificKeyframe, value, value->isCSSPropertySpecificKeyframe(), value.isCSSPropertySpecificKeyframe());
 DEFINE_TYPE_CASTS(SVGPropertySpecificKeyframe, Keyframe::PropertySpecificKeyframe, value, value->isSVGPropertySpecificKeyframe(), value.isSVGPropertySpecificKeyframe());
 
 }
 
 #endif