[Effen] missed an underscore in the _ensureDepth() logic

sky/framework/fn.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 library fn;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:sky' as sky;
 import 'reflect.dart' as reflect;
@@ skipping 77 matching lines @@
 
   void _remove() {
     _defunct = true;
     _root = null;
   }
 
   int _nodeDepth;
   void _ensureDepth() {
     if (_nodeDepth == null) {
       if (_parent != null) {
-        _parent.ensureDepth();
+        _parent._ensureDepth();
         _nodeDepth = _parent._nodeDepth + 1;
       } else {
         _nodeDepth = 0;
       }
     }
   }
 
   void _trace(String message) {
     if (!_shouldTrace)
       return;
@@ skipping 784 matching lines @@
 
 abstract class App extends Component {
   sky.Node _host;
 
   App() : super(stateful: true) {
     _host = sky.document.createElement('div');
     sky.document.appendChild(_host);
     _scheduleComponentForRender(this);
   }
 }