CSSValue Immediates: Change CSSValue to an object instead of a pointer

Source/core/css/resolver/StyleResolver.h

Index: Source/core/css/resolver/StyleResolver.h
diff --git a/Source/core/css/resolver/StyleResolver.h b/Source/core/css/resolver/StyleResolver.h
index 46a98cbef7a6dbca83f1b82eb944c099fb17678f..00728b6bf80df2408d33fe184525241957fc5354 100644
--- a/Source/core/css/resolver/StyleResolver.h
+++ b/Source/core/css/resolver/StyleResolver.h
@@ -98,8 +98,8 @@ public:
         RuleMatchingBehavior = MatchAllRules);
 
     PassRefPtr<ComputedStyle> styleForKeyframe(Element&, const ComputedStyle&, const ComputedStyle* parentStyle, const StyleRuleKeyframe*, const AtomicString& animationName);
-    static PassRefPtrWillBeRawPtr<AnimatableValue> createAnimatableValueSnapshot(Element&, const ComputedStyle* baseStyle, CSSPropertyID, CSSValue*);
-    static PassRefPtrWillBeRawPtr<AnimatableValue> createAnimatableValueSnapshot(StyleResolverState&, CSSPropertyID, CSSValue*);
+    static PassRefPtrWillBeRawPtr<AnimatableValue> createAnimatableValueSnapshot(Element&, const ComputedStyle* baseStyle, CSSPropertyID, NullableCSSValue);
+    static PassRefPtrWillBeRawPtr<AnimatableValue> createAnimatableValueSnapshot(StyleResolverState&, CSSPropertyID, NullableCSSValue);
 
     PassRefPtr<ComputedStyle> pseudoStyleForElement(Element*, const PseudoStyleRequest&, const ComputedStyle* parentStyle);
 
@@ -224,7 +224,7 @@ private:
     template <CSSPropertyPriority priority>
     void applyAnimatedProperties(StyleResolverState&, const WillBeHeapHashMap<PropertyHandle, RefPtrWillBeMember<Interpolation>>&);
     template <CSSPropertyPriority priority>
-    void applyAllProperty(StyleResolverState&, CSSValue*, bool inheritedOnly);
+    void applyAllProperty(StyleResolverState&, CSSValue, bool inheritedOnly);
 
     void matchPageRules(MatchResult&, RuleSet*, bool isLeftPage, bool isFirstPage, const String& pageName);
     void matchPageRulesForList(WillBeHeapVector<RawPtrWillBeMember<StyleRulePage>>& matchedRules, const WillBeHeapVector<RawPtrWillBeMember<StyleRulePage>>&, bool isLeftPage, bool isFirstPage, const String& pageName);