Storage of ComputedStyle separate from LayoutObject.

third_party/WebKit/Source/core/dom/NodeRareData.h

 /*
  * Copyright (C) 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 David Smith <catfish.man@gmail.com>
  *
  * 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 NodeRareData_h
 #define NodeRareData_h
 
 #include "core/dom/MutationObserverRegistration.h"
 #include "core/dom/NodeListsNodeData.h"
+#include "core/style/ComputedStyle.h"

[Timothy Loh, 2016/06/23 23:58:02]

not needed?

 #include "platform/heap/Handle.h"
 #include "wtf/HashSet.h"
 
 namespace blink {
 
 class NodeMutationObserverData final : public GarbageCollected<NodeMutationObserverData> {
     WTF_MAKE_NONCOPYABLE(NodeMutationObserverData);
 public:
     HeapVector<Member<MutationObserverRegistration>> registry;
     HeapHashSet<Member<MutationObserverRegistration>> transientRegistry;
@@ skipping 49 matching lines @@
     }
 
     unsigned connectedSubframeCount() const { return m_connectedFrameCount; }
     void incrementConnectedSubframeCount();
     void decrementConnectedSubframeCount()
     {
         DCHECK(m_connectedFrameCount);
         --m_connectedFrameCount;
     }
 
+    bool isElementRareData() const { return m_isElementRareData; }
+
     bool hasElementFlag(ElementFlags mask) const { return m_elementFlags & mask; }
     void setElementFlag(ElementFlags mask, bool value) { m_elementFlags = (m_elementFlags & ~mask) | (-(int32_t)value & mask); }
     void clearElementFlag(ElementFlags mask) { m_elementFlags &= ~mask; }
 
     bool hasRestyleFlag(DynamicRestyleFlags mask) const { return m_restyleFlags & mask; }
     void setRestyleFlag(DynamicRestyleFlags mask) { m_restyleFlags |= mask; RELEASE_ASSERT(m_restyleFlags); }
     bool hasRestyleFlags() const { return m_restyleFlags; }
     void clearRestyleFlags() { m_restyleFlags = 0; }
 
     enum {
@@ skipping 24 matching lines @@
     unsigned m_connectedFrameCount : ConnectedFrameCountBits;
     unsigned m_elementFlags : NumberOfElementFlags;
     unsigned m_restyleFlags : NumberOfDynamicRestyleFlags;
 protected:
     unsigned m_isElementRareData : 1;
 };
 
 } // namespace blink
 
 #endif // NodeRareData_h