Add hook to register global object

tools/dom/src/dart2js_DOMImplementation.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of html;
 
 // TODO(vsm): Unify with Dartium version.
 class _DOMWindowCrossFrame implements WindowBase {
   // Private window.  Note, this is a window in another frame, so it
   // cannot be typed as "Window" as its prototype is not patched
@@ skipping 36 matching lines @@
   }
 
   // Implementation support.
   _DOMWindowCrossFrame(this._window);
 
   static WindowBase _createSafe(w) {
     if (identical(w, window)) {
       return w;
     } else {
       // TODO(vsm): Cache or implement equality.
+      registerGlobalObject(w);
       return new _DOMWindowCrossFrame(w);
     }
   }
 
   // TODO(efortuna): Remove this method. dartbug.com/16814
   Events get on => throw new UnsupportedError(
       'You can only attach EventListeners to your own window.');
   // TODO(efortuna): Remove this method. dartbug.com/16814
   void _addEventListener(String type, EventListener listener,
           [bool useCapture]) =>
@@ skipping 60 matching lines @@
 
   static HistoryBase _createSafe(h) {
     if (identical(h, window.history)) {
       return h;
     } else {
       // TODO(vsm): Cache or implement equality.
       return new _HistoryCrossFrame(h);
     }
   }
 }