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

Source/core/layout/svg/SVGTextQuery.h

 /*
  * 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 SVGTextQuery_h
 #define SVGTextQuery_h
 
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/FloatRect.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class LayoutObject;
 
 class SVGTextQuery {
+    STACK_ALLOCATED();
 public:
     SVGTextQuery(LayoutObject* layoutObject) : m_queryRootLayoutObject(layoutObject) { }
 
     unsigned numberOfCharacters() const;
     float textLength() const;
     float subStringLength(unsigned startPosition, unsigned length) const;
     FloatPoint startPositionOfCharacter(unsigned position) const;
     FloatPoint endPositionOfCharacter(unsigned position) const;
     float rotationOfCharacter(unsigned position) const;
     FloatRect extentOfCharacter(unsigned position) const;
     int characterNumberAtPosition(const FloatPoint&) const;
 
 private:
     LayoutObject* m_queryRootLayoutObject;
 };
 
 }
 
 #endif