Make blink classes and structures in core/css fast-allocated

Source/core/css/CSSImageSetValue.h

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef CSSImageSetValue_h
 #define CSSImageSetValue_h
 
 #include "core/css/CSSValueList.h"
 #include "core/fetch/ResourceLoaderOptions.h"
 #include "platform/weborigin/Referrer.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class Document;
 class StyleFetchedImageSet;
 class StyleImage;
 
 class CSSImageSetValue : public CSSValueList {
 public:
 
     static PassRefPtrWillBeRawPtr<CSSImageSetValue> create()
     {
         return adoptRefWillBeNoop(new CSSImageSetValue());
     }
     ~CSSImageSetValue();
 
     StyleFetchedImageSet* cachedImageSet(Document*, float deviceScaleFactor, const ResourceLoaderOptions&);
     StyleFetchedImageSet* cachedImageSet(Document*, float deviceScaleFactor);
 
     // Returns a StyleFetchedImageSet if the best fit image has been cached already, otherwise a StylePendingImage.
     StyleImage* cachedOrPendingImageSet(float);
 
     String customCSSText() const;
 
     bool isPending() const { return !m_accessedBestFitImage; }
 
     struct ImageWithScale {
+        ALLOW_ONLY_INLINE_ALLOCATION();
         String imageURL;
         Referrer referrer;
         float scaleFactor;
     };
 
     bool hasFailedOrCanceledSubresources() const;
 
     DECLARE_TRACE_AFTER_DISPATCH();
 
 protected:
@@ skipping 13 matching lines @@
     float m_scaleFactor;
 
     Vector<ImageWithScale> m_imagesInSet;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSImageSetValue, isImageSetValue());
 
 } // namespace blink
 
 #endif // CSSImageSetValue_h