Storage of ComputedStyle separate from LayoutObject.

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

Index: third_party/WebKit/Source/core/dom/NodeRareData.h
diff --git a/third_party/WebKit/Source/core/dom/NodeRareData.h b/third_party/WebKit/Source/core/dom/NodeRareData.h
index f8d77595b6bbc7ad4f264b86e39a6d563dd6cf80..764e8d2d8e2d7b78b88fb58acf1cc35ad1b178e5 100644
--- a/third_party/WebKit/Source/core/dom/NodeRareData.h
+++ b/third_party/WebKit/Source/core/dom/NodeRareData.h
@@ -24,6 +24,7 @@
 
 #include "core/dom/MutationObserverRegistration.h"
 #include "core/dom/NodeListsNodeData.h"
+#include "core/style/ComputedStyle.h"
 #include "platform/heap/Handle.h"
 #include "wtf/HashSet.h"
 #include "wtf/OwnPtr.h"
@@ -104,6 +105,9 @@ public:
     bool hasRestyleFlags() const { return m_restyleFlags; }
     void clearRestyleFlags() { m_restyleFlags = 0; }
 
+    CORE_EXPORT ComputedStyle* computedStyle() const;
+    void setComputedStyle(PassRefPtr<ComputedStyle>);
+
     enum {
         ConnectedFrameCountBits = 10, // Must fit Page::maxNumberOfFrames.
     };
@@ -119,6 +123,7 @@ public:
 protected:
     explicit NodeRareData(LayoutObject* layoutObject)
         : NodeRareDataBase(layoutObject)
+        , m_computedStyle(nullptr)
         , m_connectedFrameCount(0)
         , m_elementFlags(0)
         , m_restyleFlags(0)
@@ -128,6 +133,7 @@ protected:
 private:
     Member<NodeListsNodeData> m_nodeLists;
     Member<NodeMutationObserverData> m_mutationObserverData;
+    RefPtr<ComputedStyle> m_computedStyle;
 
     unsigned m_connectedFrameCount : ConnectedFrameCountBits;
     unsigned m_elementFlags : NumberOfElementFlags;