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

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

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 17 matching lines @@
 
 #include "core/HTMLNames.h"
 #include "core/dom/PseudoElement.h"
 #include "core/dom/shadow/FlatTreeTraversal.h"
 #include "core/layout/LayoutObject.h"
 
 namespace blink {
 
 namespace LayoutTreeBuilderTraversal {
 
+inline static bool hasDisplayContentsStyle(const Node& node) {
+  return node.isElementNode() && toElement(node).displayContentsStyle();
+}
+
 static bool isLayoutObjectReparented(const LayoutObject* layoutObject) {
   if (!layoutObject->node()->isElementNode())
     return false;
+
   if (toElement(layoutObject->node())->isInTopLayer())
     return true;
+
+  if (layoutObject->node()->parentNode() &&
+      hasDisplayContentsStyle(*layoutObject->node()->parentNode()))
+    return true;
+
   return false;
 }
 
 void ParentDetails::didTraverseInsertionPoint(
     const InsertionPoint* insertionPoint) {
   if (!m_insertionPoint) {
     m_insertionPoint = insertionPoint;
   }
 }
 
 inline static void assertPseudoElementParent(
     const PseudoElement& pseudoElement) {
   DCHECK(pseudoElement.parentNode());
   DCHECK(pseudoElement.parentNode()->canParticipateInFlatTree());
 }
 
 ContainerNode* parent(const Node& node, ParentDetails* details) {
   // TODO(hayato): Uncomment this once we can be sure
   // LayoutTreeBuilderTraversal::parent() is used only for a node which is
   // connected.
   // DCHECK(node.isConnected());
   if (node.isPseudoElement()) {
     assertPseudoElementParent(toPseudoElement(node));
     return node.parentNode();
   }
   return FlatTreeTraversal::parent(node, details);
 }
 
+LayoutObject* parentLayoutObject(const Node& node) {
+  ContainerNode* parent = LayoutTreeBuilderTraversal::parent(node);
+
+  while (parent && hasDisplayContentsStyle(*parent)) {
+    parent = LayoutTreeBuilderTraversal::parent(*parent);
+  }
+
+  return parent ? parent->layoutObject() : 0;

[jfernandez, 2016/10/27 17:08:02]

use nullptr instead of 0

+}
+
 Node* nextSibling(const Node& node) {
   if (node.isBeforePseudoElement()) {
     assertPseudoElementParent(toPseudoElement(node));
     if (Node* next = FlatTreeTraversal::firstChild(*node.parentNode()))
       return next;
   } else {
     if (node.isAfterPseudoElement())
       return nullptr;
     if (Node* next = FlatTreeTraversal::nextSibling(node))
       return next;
@@ skipping 167 matching lines @@
   for (size_t i = position + 1; i < topLayerElements.size(); ++i) {
     if (LayoutObject* layoutObject = topLayerElements[i]->layoutObject())
       return layoutObject;
   }
   return 0;
 }
 
 }  // namespace LayoutTreeBuilderTraversal
 
 }  // namespace blink