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

Source/core/animation/css/CSSAnimatableValueFactory.h

Index: Source/core/animation/css/CSSAnimatableValueFactory.h
diff --git a/Source/core/animation/css/CSSAnimatableValueFactory.h b/Source/core/animation/css/CSSAnimatableValueFactory.h
index 441e5724312b7b6cf4fa3ca07a64fb88293b544e..f5e73e3a15400566084802ca5ab253a2630f9b81 100644
--- a/Source/core/animation/css/CSSAnimatableValueFactory.h
+++ b/Source/core/animation/css/CSSAnimatableValueFactory.h
@@ -33,6 +33,7 @@
 
 #include "core/CSSPropertyNames.h"
 #include "core/animation/animatable/AnimatableValue.h"
+#include "wtf/Allocator.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
@@ -40,6 +41,7 @@ namespace blink {
 class ComputedStyle;
 
 class CSSAnimatableValueFactory {
+    STATIC_ONLY(CSSAnimatableValueFactory);
 public:
     static PassRefPtrWillBeRawPtr<AnimatableValue> create(CSSPropertyID, const ComputedStyle&);
 private: