Perf Tryjob: CSSValue refactor step 1

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 f732911cf78f089867378ea360c21f7f5982c328..baef2b79025399a878ae71d5f9819569a7c874e3 100644
--- a/Source/core/css/resolver/StyleResolver.h
+++ b/Source/core/css/resolver/StyleResolver.h
@@ -97,8 +97,8 @@ public:
     PassRefPtr<ComputedStyle> styleForElement(Element*, const ComputedStyle* parentStyle = 0, StyleSharingBehavior = AllowStyleSharing,
         RuleMatchingBehavior = MatchAllRules);
 
-    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);
 
@@ -223,7 +223,7 @@ 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);