Set ComputedStyle on Node and use that in buildOwnLayout()

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2008 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple 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
  * License as published by the Free Software Foundation; either
@@ skipping 41 matching lines @@
         return nonLayoutObjectComputedStyle();
     if (hasRareData()) {
         NodeRareData* rareData = this->rareData();
         if (!rareData->isElementRareData())
             return nullptr;
         return static_cast<ElementRareData*>(rareData)->computedStyle();
     }
     return m_data.m_computedStyle;
 }
 
+inline void Node::setComputedStyle(PassRefPtr<ComputedStyle> computedStyle)
+{
+    // Note that if the DataUnion is a LayoutObject it is the old LayoutObject which will be detached in reattachLayoutTree.
+    // We don't want to associated the new ComputedStyle with the old LayoutObject. So we don't do anything at this stage.
+    if (hasRareData()) {
+        // If the DataUnion is an ElementRareData - set the ComputedStyle on that ElementRareData.
+        NodeRareData* rareData = this->rareData();
+        if (rareData->isElementRareData())
+            static_cast<ElementRareData*>(rareData)->setComputedStyle(computedStyle);
+    } else {
+        // If the DataUnion is a ComputedStyle - make it point to the new ComputedStyle passed in.
+        if (m_data.m_computedStyle)
+            m_data.m_computedStyle->deref();
+        m_data.m_computedStyle = computedStyle.leakRef();
+    }
+}
+
 inline const ComputedStyle* Node::parentComputedStyle() const
 {
     if (isSlotOrActiveInsertionPoint())
         return 0;
     ContainerNode* parent = LayoutTreeBuilderTraversal::parent(*this);
     return parent ? parent->computedStyle() : 0;
 }
 
 inline const ComputedStyle& Node::computedStyleRef() const
 {
     const ComputedStyle* style = computedStyle();
     DCHECK(style);
     return *style;
 }
 
 } // namespace blink
 #endif // NodeComputedStyle_h