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

Source/core/layout/svg/SVGSubpathData.h

 /*
  * Copyright (C) 2012 Google, Inc.
  *
  * 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 SVGSubpathData_h
 #define SVGSubpathData_h
 
 #include "platform/graphics/Path.h"
+#include "wtf/Allocator.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class SVGSubpathData {
+    STACK_ALLOCATED();
 public:
     SVGSubpathData(Vector<FloatPoint>& zeroLengthSubpathLocations)
         : m_zeroLengthSubpathLocations(zeroLengthSubpathLocations)
         , m_haveSeenMoveOnly(true)
         , m_pathIsZeroLength(true)
     {
         m_lastPoint.set(0, 0);
         m_movePoint.set(0, 0);
     }
 
@@ skipping 49 matching lines @@
     Vector<FloatPoint>& m_zeroLengthSubpathLocations;
     FloatPoint m_lastPoint;
     FloatPoint m_movePoint;
     bool m_haveSeenMoveOnly;
     bool m_pathIsZeroLength;
 };
 
 }
 
 #endif // SVGSubpathData_h