Implement Node.treeRoot

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 33 matching lines @@
 
     [PerWorldBindings] readonly attribute Document? ownerDocument;
     [PerWorldBindings] readonly attribute Node? parentNode;
     [PerWorldBindings] readonly attribute Element? parentElement;
     [ImplementedAs=hasChildren] boolean hasChildNodes();
     [SameObject, PerWorldBindings] readonly attribute NodeList childNodes;
     [PerWorldBindings] readonly attribute Node? firstChild;
     [PerWorldBindings] readonly attribute Node? lastChild;
     [PerWorldBindings] readonly attribute Node? previousSibling;
     [PerWorldBindings] readonly attribute Node? nextSibling;
+    [RuntimeEnabled=ShadowDOMV1, MeasureAs=NodeTreeRoot] readonly attribute Node treeRoot;
 
     [CustomElementCallbacks] attribute DOMString? nodeValue;
     // FIXME: textContent should not have [TreatUndefinedAs=NullString].
     [TreatUndefinedAs=NullString, CustomElementCallbacks] attribute DOMString? textContent;
     [CustomElementCallbacks] void normalize();
 
     [NewObject, CustomElementCallbacks] Node cloneNode(optional boolean deep = false);
     boolean isEqualNode(Node? node);
 
     const unsigned short DOCUMENT_POSITION_DISCONNECTED = 0x01;
@@ skipping 11 matching lines @@
 
     [CustomElementCallbacks, PerWorldBindings, RaisesException] Node insertBefore(Node node, Node? child);
     [CustomElementCallbacks, PerWorldBindings, RaisesException] Node appendChild(Node node);
     [CustomElementCallbacks, PerWorldBindings, RaisesException] Node replaceChild(Node node, Node child);
     [CustomElementCallbacks, RaisesException] Node removeChild(Node child);
 
     // FIXME: isSameNode has been removed from the spec:
     // https://www.w3.org/Bugs/Public/show_bug.cgi?id=27424
     [MeasureAs=NodeIsSameNode] boolean isSameNode(Node? other);
 };