Make classes and structures in core/layout fast-allocated.

Source/core/layout/shapes/RasterShape.h

 /*
  * Copyright (C) 2013 Adobe Systems Incorporated. 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.
@@ skipping 21 matching lines @@
 
 #include "core/layout/shapes/Shape.h"
 #include "core/layout/shapes/ShapeInterval.h"
 #include "platform/geometry/FloatRect.h"
 #include "wtf/Assertions.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class RasterShapeIntervals {
+    WTF_MAKE_FAST_ALLOCATED(RasterShapeIntervals);
 public:
     RasterShapeIntervals(unsigned size, int offset = 0)
         : m_offset(offset)
     {
         m_intervals.resize(clampTo<int>(size));
     }
 
     void initializeBounds();
     const IntRect& bounds() const { return m_bounds; }
     bool isEmpty() const { return m_bounds.isEmpty(); }
@@ skipping 49 matching lines @@
     const RasterShapeIntervals& marginIntervals() const;
 
     OwnPtr<RasterShapeIntervals> m_intervals;
     mutable OwnPtr<RasterShapeIntervals> m_marginIntervals;
     IntSize m_marginRectSize;
 };
 
 } // namespace blink
 
 #endif // RasterShape_h