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

Source/core/layout/compositing/CompositingInputsUpdater.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CompositingInputsUpdater_h
 #define CompositingInputsUpdater_h
 
 #include "core/layout/LayoutGeometryMap.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class DeprecatedPaintLayer;
 
 class CompositingInputsUpdater {
+    STACK_ALLOCATED();
 public:
     explicit CompositingInputsUpdater(DeprecatedPaintLayer* rootLayer);
     ~CompositingInputsUpdater();
 
     void update();
 
 #if ENABLE(ASSERT)
     static void assertNeedsCompositingInputsUpdateBitsCleared(DeprecatedPaintLayer*);
 #endif
 
@@ skipping 27 matching lines @@
 
     void updateRecursive(DeprecatedPaintLayer*, UpdateType, AncestorInfo);
 
     LayoutGeometryMap m_geometryMap;
     DeprecatedPaintLayer* m_rootLayer;
 };
 
 } // namespace blink
 
 #endif // CompositingInputsUpdater_h