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

Source/core/layout/svg/SVGLayoutSupport.h

 /**
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef SVGLayoutSupport_h
 #define SVGLayoutSupport_h
 
 #include "core/layout/LayoutObject.h"
 #include "core/style/SVGComputedStyleDefs.h"
 #include "platform/graphics/DashArray.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class AffineTransform;
 class FloatPoint;
 class FloatRect;
 class PaintInvalidationState;
 class LayoutRect;
 class LayoutGeometryMap;
 class LayoutBoxModelObject;
 class LayoutObject;
 class ComputedStyle;
 class LayoutSVGRoot;
 class SVGLengthContext;
 class StrokeData;
 class TransformState;
 
 class SVGLayoutSupport {
+    STATIC_ONLY(SVGLayoutSupport);
 public:
     // Shares child layouting code between LayoutSVGRoot/LayoutSVG(Hidden)Container
     static void layoutChildren(LayoutObject*, bool selfNeedsLayout);
 
     // Layout resources used by this node.
     static void layoutResourcesIfNeeded(const LayoutObject*);
 
     // Helper function determining whether overflow is hidden.
     static bool isOverflowHidden(const LayoutObject*);
 
@@ skipping 46 matching lines @@
 
     static AffineTransform deprecatedCalculateTransformToLayer(const LayoutObject*);
     static float calculateScreenFontSizeScalingFactor(const LayoutObject*);
 
 private:
     static void updateObjectBoundingBox(FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, LayoutObject* other, FloatRect otherBoundingBox);
     static bool layoutSizeOfNearestViewportChanged(const LayoutObject* start);
 };
 
 class SubtreeContentTransformScope {
+    STACK_ALLOCATED();
 public:
     SubtreeContentTransformScope(const AffineTransform&);
     ~SubtreeContentTransformScope();
 
 private:
     AffineTransform m_savedContentTransformation;
 };
 
 template <typename LayoutObjectType>
 bool SVGLayoutSupport::computeHasNonIsolatedBlendingDescendants(const LayoutObjectType* object)
 {
     for (LayoutObject* child = object->firstChild(); child; child = child->nextSibling()) {
         if (child->isBlendingAllowed() && child->style()->hasBlendMode())
             return true;
         if (child->hasNonIsolatedBlendingDescendants() && !willIsolateBlendingDescendantsForObject(child))
             return true;
     }
     return false;
 }
 
 } // namespace blink
 
 #endif // SVGLayoutSupport_h