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

Source/core/layout/PaintInvalidationState.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 PaintInvalidationState_h
 #define PaintInvalidationState_h
 
 #include "platform/geometry/LayoutRect.h"
 #include "platform/transforms/AffineTransform.h"
+#include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class LayoutBoxModelObject;
 class LayoutObject;
 class LayoutSVGModelObject;
 class LayoutView;
 
 class PaintInvalidationState {
+    STACK_ALLOCATED();
     WTF_MAKE_NONCOPYABLE(PaintInvalidationState);
 public:
     PaintInvalidationState(PaintInvalidationState& next, LayoutBoxModelObject& layoutObject, const LayoutBoxModelObject& paintInvalidationContainer);
     PaintInvalidationState(PaintInvalidationState& next, const LayoutSVGModelObject& layoutObject);
 
     PaintInvalidationState(const LayoutView& layoutView, Vector<LayoutObject*>& pendingDelayedPaintInvalidations)
         : PaintInvalidationState(layoutView, pendingDelayedPaintInvalidations, nullptr) { }
     PaintInvalidationState(const LayoutView& layoutView, PaintInvalidationState& ownerPaintInvalidationState)
         : PaintInvalidationState(layoutView, ownerPaintInvalidationState.m_pendingDelayedPaintInvalidations, &ownerPaintInvalidationState) { }
 
@@ skipping 41 matching lines @@
     // SVG root to the userspace _before_ the relevant element. Combining this
     // with |m_paintOffset| yields the "final" offset.
     OwnPtr<AffineTransform> m_svgTransform;
 
     Vector<LayoutObject*>& m_pendingDelayedPaintInvalidations;
 };
 
 } // namespace blink
 
 #endif // PaintInvalidationState_h