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

Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.h

 /*
  * Copyright (C) 2009, 2010, 2011 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 14 matching lines @@
 
 #ifndef CompositedDeprecatedPaintLayerMapping_h
 #define CompositedDeprecatedPaintLayerMapping_h
 
 #include "core/layout/compositing/GraphicsLayerUpdater.h"
 #include "core/paint/DeprecatedPaintLayer.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/FloatPoint3D.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/graphics/GraphicsLayerClient.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class DeprecatedPaintLayerCompositor;
 
 // A GraphicsLayerPaintInfo contains all the info needed to paint a partial subtree of Layers into a GraphicsLayer.
 struct GraphicsLayerPaintInfo {
+    ALLOW_ONLY_INLINE_ALLOCATION();
     DeprecatedPaintLayer* paintLayer;
 
     LayoutRect compositedBounds;
 
     // The clip rect to apply, in the local coordinate space of the squashed layer, when painting it.
     IntRect localClipRectForSquashedLayer;
 
     // Offset describing where this squashed Layer paints into the shared GraphicsLayer backing.
     IntSize offsetFromLayoutObject;
     bool offsetFromLayoutObjectSet;
@@ skipping 370 matching lines @@
     unsigned m_pendingUpdateScope : 2;
     unsigned m_isMainFrameLayoutViewLayer : 1;
 
     unsigned m_backgroundLayerPaintsFixedRootBackground : 1;
     unsigned m_scrollingContentsAreEmpty : 1;
 };
 
 } // namespace blink
 
 #endif // CompositedDeprecatedPaintLayerMapping_h