Storage of ComputedStyle separate from LayoutObject.

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

Index: third_party/WebKit/Source/core/dom/NodeComputedStyle.h
diff --git a/third_party/WebKit/Source/core/dom/NodeComputedStyle.h b/third_party/WebKit/Source/core/dom/NodeComputedStyle.h
index 78872cdcf125b3139e08a8e7752e6eda40cfea34..a21c2953ee37e54a7f3ac4c6351c8ea6336762de 100644
--- a/third_party/WebKit/Source/core/dom/NodeComputedStyle.h
+++ b/third_party/WebKit/Source/core/dom/NodeComputedStyle.h
@@ -41,14 +41,26 @@ inline const ComputedStyle* Node::computedStyle() const
 
 inline ComputedStyle* Node::mutableComputedStyle() const
 {
-    if (LayoutObject* layoutObject = this->layoutObject())
-        return layoutObject->mutableStyle();
+    if (hasLayoutObject())
+        return this->layoutObject()->mutableStyle();
     // <option> and <optgroup> can be styled even if they don't get layout objects,
     // so they store their style internally and return it through nonLayoutObjectComputedStyle().
     // We check here explicitly to avoid the virtual call in the common case.
     if (isHTMLOptGroupElement(*this) || isHTMLOptionElement(this))
         return nonLayoutObjectComputedStyle();
-    return 0;
+    if (hasRareData())
+        return m_data.m_rareData->computedStyle();
+    return m_data.m_computedStyle;
+}
+
+inline void Node::setComputedStyle(ComputedStyle* computedStyle)
+{
+    if (hasRareData())
+        m_data.m_rareData->setComputedStyle(computedStyle);
+    else if (hasLayoutObject())
+        m_data.m_layoutObject->setStyleInternal(computedStyle);
+    else
+        m_data.m_computedStyle = computedStyle;
 }
 
 inline const ComputedStyle* Node::parentComputedStyle() const