Implement 'will-change' parsing

Source/core/rendering/style/RenderStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. 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.
  *
@@ skipping 107 matching lines @@
     m_box.init();
     visual.init();
     m_background.init();
     surround.init();
     rareNonInheritedData.init();
     rareNonInheritedData.access()->m_deprecatedFlexibleBox.init();
     rareNonInheritedData.access()->m_flexibleBox.init();
     rareNonInheritedData.access()->m_marquee.init();
     rareNonInheritedData.access()->m_multiCol.init();
     rareNonInheritedData.access()->m_transform.init();
+    rareNonInheritedData.access()->m_willChange.init();
     rareNonInheritedData.access()->m_filter.init();
     rareNonInheritedData.access()->m_grid.init();
     rareNonInheritedData.access()->m_gridItem.init();
     rareInheritedData.init();
     inherited.init();
     m_svgStyle.init();
 }
 
 ALWAYS_INLINE RenderStyle::RenderStyle(const RenderStyle& o)
     : RefCounted<RenderStyle>()
@@ skipping 1450 matching lines @@
 }
 
 void RenderStyle::setBorderImageOutset(const BorderImageLengthBox& outset)
 {
     if (surround->border.m_image.outset() == outset)
         return;
     surround.access()->border.m_image.setOutset(outset);
 }
 
 } // namespace WebCore