Make classes and structures in Source/core/animation fast-allocated.

Source/core/animation/css/CSSPropertyEquality.h

Index: Source/core/animation/css/CSSPropertyEquality.h
diff --git a/Source/core/animation/css/CSSPropertyEquality.h b/Source/core/animation/css/CSSPropertyEquality.h
index 5e125245a46ec5a227ee620e63e6d4e9c8080283..00d5c98791bbb4e9c2aa6a7a6c501db5d5382024 100644
--- a/Source/core/animation/css/CSSPropertyEquality.h
+++ b/Source/core/animation/css/CSSPropertyEquality.h
@@ -6,12 +6,14 @@
 #define CSSPropertyEquality_h
 
 #include "core/CSSPropertyNames.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class ComputedStyle;
 
 class CSSPropertyEquality {
+    STATIC_ONLY(CSSPropertyEquality);
 public:
     static bool propertiesEqual(CSSPropertyID, const ComputedStyle&, const ComputedStyle&);
 };