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

Source/core/layout/compositing/GraphicsLayerUpdater.h

Index: Source/core/layout/compositing/GraphicsLayerUpdater.h
diff --git a/Source/core/layout/compositing/GraphicsLayerUpdater.h b/Source/core/layout/compositing/GraphicsLayerUpdater.h
index 56b4eb121264e1c879f883bce79464d3c29aec37..64349234777ce49ac7220731aabb6b008b6e4d76 100644
--- a/Source/core/layout/compositing/GraphicsLayerUpdater.h
+++ b/Source/core/layout/compositing/GraphicsLayerUpdater.h
@@ -28,13 +28,14 @@
 #define GraphicsLayerUpdater_h
 
 #include "platform/graphics/GraphicsLayer.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class DeprecatedPaintLayer;
 
 class GraphicsLayerUpdater {
-
+    STACK_ALLOCATED();
 public:
     GraphicsLayerUpdater();
     ~GraphicsLayerUpdater();