Support display: contents for elements, first-line and first-letter pseudos.

third_party/WebKit/Source/core/css/resolver/ElementResolveContext.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 15 matching lines @@
 #include "core/dom/Node.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/VisitedLinkState.h"
 #include "core/dom/shadow/InsertionPoint.h"
 
 namespace blink {
 
 ElementResolveContext::ElementResolveContext(const Document& document)
     : m_element(nullptr),
       m_parentNode(nullptr),
+      m_layoutParent(nullptr),
       m_rootElementStyle(document.documentElement()
                              ? document.documentElement()->computedStyle()
                              : document.computedStyle()),
       m_elementLinkState(EInsideLink::kNotInsideLink),
       m_distributedToInsertionPoint(false) {}
 
 ElementResolveContext::ElementResolveContext(Element& element)
     : m_element(&element),
       m_elementLinkState(
           element.document().visitedLinkState().determineLinkState(element)),
       m_distributedToInsertionPoint(false) {
   LayoutTreeBuilderTraversal::ParentDetails parentDetails;
-  m_parentNode =
-      element.isActiveSlotOrActiveInsertionPoint()
-          ? nullptr
-          : LayoutTreeBuilderTraversal::parent(element, &parentDetails);
+  if (element.isActiveSlotOrActiveInsertionPoint()) {
+    m_parentNode = nullptr;
+    m_layoutParent = nullptr;
+  } else {
+    m_parentNode = LayoutTreeBuilderTraversal::parent(element);
+    m_layoutParent =
+        LayoutTreeBuilderTraversal::layoutParent(element, &parentDetails);
+  }
   m_distributedToInsertionPoint = parentDetails.insertionPoint();
 
   const Document& document = element.document();
   Node* documentElement = document.documentElement();
   const ComputedStyle* documentStyle = document.computedStyle();
   m_rootElementStyle = documentElement && element != documentElement
                            ? documentElement->computedStyle()
                            : documentStyle;
   if (!m_rootElementStyle)
     m_rootElementStyle = documentStyle;
 }
 
 }  // namespace blink