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

Source/core/layout/VerticalPositionCache.h

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef VerticalPositionCache_h
 #define VerticalPositionCache_h
 
 #include "platform/fonts/FontBaseline.h"
+#include "wtf/Allocator.h"
 #include "wtf/HashMap.h"
 
 namespace blink {
 
 class LayoutObject;
 
 // Values for vertical alignment.
 const int PositionUndefined = 0x80000000;
 
 class VerticalPositionCache {
+    STACK_ALLOCATED();
     WTF_MAKE_NONCOPYABLE(VerticalPositionCache);
 public:
     VerticalPositionCache()
     { }
 
     int get(LayoutObject* layoutObject, FontBaseline baselineType) const
     {
         const HashMap<LayoutObject*, int>& mapToCheck = baselineType == AlphabeticBaseline ? m_alphabeticPositions : m_ideographicPositions;
         const HashMap<LayoutObject*, int>::const_iterator it = mapToCheck.find(layoutObject);
         if (it == mapToCheck.end())
@@ skipping 10 matching lines @@
     }
 
 private:
     HashMap<LayoutObject*, int> m_alphabeticPositions;
     HashMap<LayoutObject*, int> m_ideographicPositions;
 };
 
 } // namespace blink
 
 #endif // VerticalPositionCache_h