Support for anonymous state routes

sky/sdk/lib/widgets/navigator.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.
 
 import 'package:sky/widgets/basic.dart';
 
 typedef Widget Builder(Navigator navigator, RouteBase route);
 
 abstract class RouteBase {
-  RouteBase({ this.name });
-  final String name;
+  RouteBase({ this.key });
+  final Object key;
   Widget build(Navigator navigator, RouteBase route);
   void popState() { }
 }
 
 class Route extends RouteBase {
-  Route({ String name, this.builder }) : super(name: name);
+  Route({ String name, this.builder }) : super(key: name);
+  String get name => key;
   final Builder builder;
   Widget build(Navigator navigator, RouteBase route) => builder(navigator, route);
 }
 
 class RouteState extends RouteBase {
 
-  RouteState({this.callback, this.route, String name}) : super(name: name);
+  RouteState({ this.callback, this.route, Object key }) : super(key: key);
 
   RouteBase route;
   Function callback;
 
   Widget build(Navigator navigator, _) => route.build(navigator, this);
 
   void popState() {
     if (callback != null)
       callback(this);
   }
@@ skipping 44 matching lines @@
   Navigator(this.state, { String key }) : super(key: key);
 
   NavigationState state;
 
   void syncFields(Navigator source) {
     state = source.state;
   }
 
   RouteBase get currentRoute => state.currentRoute;
 
-  void pushState(String name, Function callback) {
+  void pushState(Object key, Function callback) {
     RouteBase route = new RouteState(
-      name: name,
+      key: key,
       callback: callback,
       route: state.currentRoute
     );
     push(route);
   }
 
   void pushNamed(String name) {
     setState(() {
       state.pushNamed(name);
     });
   }
 
   void push(RouteBase route) {
     setState(() {
       state.push(route);
     });
   }
 
   void pop() {
     setState(() {
       state.pop();
     });
   }
 
   Widget build() {
     return state.currentRoute.build(this, state.currentRoute);
   }
 }