Set ComputedStyle on Node and use that in buildOwnLayout()

third_party/WebKit/Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 262 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(hasRareData());
     return static_cast<NodeRareData*>(m_data.m_rareData);
 }
 
 NodeRareData& Node::ensureRareData()
 {
     if (hasRareData())
         return *rareData();
 
     if (isElementNode())
-        m_data.m_rareData = ElementRareData::create(m_data.m_layoutObject);

[nainar, 2016/07/06 07:09:03]

@bugsnash, 

These two lines should be changed in your patch - since this is caused by adding
ComputedStyle on the DataUnion. 

[Bugs Nash, 2016/07/06 21:32:21]

Good spot

+        m_data.m_rareData = ElementRareData::create(hasLayoutObject() ? m_data.m_layoutObject : nullptr);
     else
-        m_data.m_rareData = NodeRareData::create(m_data.m_layoutObject);
+        m_data.m_rareData = NodeRareData::create(hasLayoutObject() ? m_data.m_layoutObject : nullptr);
 
     DCHECK(m_data.m_rareData);
 
     setFlag(HasRareDataFlag);
     return *rareData();
 }
 
 Node* Node::toNode()
 {
     return this;
@@ skipping 2207 matching lines @@
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
     else
         fprintf(stderr, "Cannot showNodePath for (nil)\n");
 }
 
 #endif