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

Source/core/layout/shapes/PolygonShape.h

 /*
  * Copyright (C) 2012 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 19 matching lines @@
 #ifndef PolygonShape_h
 #define PolygonShape_h
 
 #include "core/layout/shapes/Shape.h"
 #include "core/layout/shapes/ShapeInterval.h"
 #include "platform/geometry/FloatPolygon.h"
 
 namespace blink {
 
 class OffsetPolygonEdge final : public VertexPair {
+    DISALLOW_ALLOCATION();
 public:
     OffsetPolygonEdge(const FloatPolygonEdge& edge, const FloatSize& offset)
         : m_vertex1(edge.vertex1() + offset)
         , m_vertex2(edge.vertex2() + offset)
     {
     }
 
     const FloatPoint& vertex1() const override { return m_vertex1; }
     const FloatPoint& vertex2() const override { return m_vertex2; }
 
@@ skipping 21 matching lines @@
     LineSegment getExcludedInterval(LayoutUnit logicalTop, LayoutUnit logicalHeight) const override;
     void buildDisplayPaths(DisplayPaths&) const override;
 
 private:
     FloatPolygon m_polygon;
 };
 
 } // namespace blink
 
 #endif // PolygonShape_h