Port sky-scrollable to Dart

sky/engine/core/dom/Document.idl

 /*
  * Copyright (C) 2006, 2007, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006, 2007 Samuel Weinig <sam@webkit.org>
  *
  * 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 11 matching lines @@
 
 typedef (CanvasRenderingContext2D or WebGLRenderingContext) RenderingContext;
 
 [
     Constructor(),
     ConstructorCallWith=Document,
 ] interface Document : ParentNode {
     [CustomElementCallbacks, RaisesException] Element createElement(DOMString tagName);
     DocumentFragment createDocumentFragment();
 
-    [CustomElementCallbacks, RaisesException, TypeChecking=Interface] Node importNode(Node node, optional boolean deep = false);
+    [CustomElementCallbacks, RaisesException, TypeChecking=Interface] Node importNode(Node node, [Named] optional boolean deep = false);
 
     Element getElementById(DOMString elementId);
 
     [RaisesException, CustomElementCallbacks, TypeChecking=Interface] Node adoptNode(Node node);
 
     readonly attribute DOMString? baseURI;
 
     Range createRange();
 
     [ImplementedAs=executingWindow] readonly attribute Window defaultView;
@@ skipping 22 matching lines @@
     boolean hasFocus();
 
     [RaisesException] void registerElement(DOMString name, any type);
 
     // Page visibility API.
     readonly attribute DOMString visibilityState;
     readonly attribute boolean hidden;
 
     readonly attribute HTMLScriptElement currentScript;
 };