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

Source/core/layout/svg/SVGTextFragment.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 SVGTextFragment_h
 #define SVGTextFragment_h
 
 #include "platform/transforms/AffineTransform.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 // A SVGTextFragment describes a text fragment of a LayoutSVGInlineText which can be laid out at once.
 struct SVGTextFragment {
+    ALLOW_ONLY_INLINE_ALLOCATION();
     SVGTextFragment()
         : characterOffset(0)
         , metricsListOffset(0)
         , length(0)
         , isTextOnPath(false)
         , x(0)
         , y(0)
         , width(0)
         , height(0)
     {
@@ skipping 63 matching lines @@
 
         result = transform;
         transformAroundOrigin(result);
         result.preMultiply(lengthAdjustTransform);
     }
 };
 
 } // namespace blink
 
 #endif