port TemplateBinding to ed3266266e751b5ab1f75f8e0509d0d5f0ef35d8

pkg/template_binding/test/custom_element_bindings_test.dart

 // Copyright (c) 2013, 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.
 
 library template_binding.test.custom_element_bindings_test;
 
 import 'dart:async';
 import 'dart:html';
 import 'package:custom_element/polyfill.dart';
 import 'package:template_binding/template_binding.dart';
@@ skipping 106 matching lines @@
           '<my-custom-element my-point="{{a}}" scary-monster="{{b}}">'
           '</my-custom-element>'
         '</template>');
 
     templateBind(div.query('template')).model = model;
     performMicrotaskCheckpoint();
 
     var element = div.nodes[1];
 
     expect(element is MyCustomElement, true,
-        reason: '${element} should be a MyCustomElement');
+        reason: '$element should be a MyCustomElement');
 
     expect(element.myPoint, model['a']);
     expect(element.scaryMonster, model['b']);
 
     expect(element.attributes, isNot(contains('my-point')));
     expect(element.attributes, isNot(contains('scary-monster')));
 
     model['a'] = null;
     performMicrotaskCheckpoint();
     expect(element.myPoint, null);
@@ skipping 34 matching lines @@
         attributes.remove(name);
         unbind(name);
         return bindings[name] = new _MyCustomBinding(this, name, model, path);
     }
     return nodeBindFallback(this).bind(name, model, path);
   }
 
   unbind(name) => nodeBindFallback(this).unbind(name);
   unbindAll() => nodeBindFallback(this).unbindAll();
   get bindings => nodeBindFallback(this).bindings;
+  get templateInstance => nodeBindFallback(this).templateInstance;
 }
 
 class _MyCustomBinding extends NodeBinding {
   _MyCustomBinding(MyCustomElement node, property, model, path)
       : super(node, property, model, path) {
 
     node.attributes.remove(property);
   }
 
   MyCustomElement get node => super.node;
@@ skipping 47 matching lines @@
 
   void addAll(Map<K, V> other) => _map.addAll(other);
   void clear() => _map.clear();
   void forEach(void f(K key, V value)) => _map.forEach(f);
   Iterable<K> get keys => _map.keys;
   Iterable<V> get values => _map.values;
   int get length => _map.length;
   bool get isEmpty => _map.isEmpty;
   bool get isNotEmpty => _map.isNotEmpty;
 }