Change LayoutState to be stack-allocated

Source/core/rendering/RenderObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. 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
@@ skipping 1002 matching lines @@
         // Make sure our parent is marked as needing invalidation.
         if (b && parent() && !parent()->mayNeedPaintInvalidation())
             parent()->setMayNeedPaintInvalidation(b);
     }
 
     bool shouldCheckForPaintInvalidationAfterLayout()
     {
         return layoutDidGetCalled() || mayNeedPaintInvalidation();
     }
 
-    bool shouldDisableLayoutState() const { return hasColumns() || hasTransform() || hasReflection() || style()->isFlippedBlocksWritingMode(); }
+    bool supportsLayoutStateCachedOffsets() const { return !hasColumns() && !hasTransform() && !hasReflection() && !style()->isFlippedBlocksWritingMode(); }
 
     void setNeedsOverflowRecalcAfterStyleChange();
     void markContainingBlocksForOverflowRecalc();
 
 protected:
     inline bool layerCreationAllowedForSubtree() const;
 
     // Overrides should call the superclass at the end. m_style will be 0 the first time
     // this function will be called.
     virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle);
@@ skipping 444 matching lines @@
 void showTree(const WebCore::RenderObject*);
 void showLineTree(const WebCore::RenderObject*);
 void showRenderTree(const WebCore::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const WebCore::RenderObject* object1, const WebCore::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h