Adding Angular and dependent packages for testing

third_party/pkg/angular/demo/todo/todo.dart

 library todo;
 
 import 'package:angular/angular.dart';
 
 class Item {
   String text;
   bool done;
 
   Item([String this.text = '', bool this.done = false]);
 
@@ skipping 19 matching lines @@
         todo.items.add(new Item(d["text"], d["done"]));
       });
     });
   }
 }
 
 // An implementation of ServerController that does nothing.
 // Logic in main.dart determines which implementation we should
 // use.
 class NoServerController implements ServerController {
-  Http _http;
   init(TodoController todo) { }
 }
 
 
 @NgDirective(
   selector: '[todo-controller]',
   publishAs: 'todo'
 )
 class TodoController {
   List<Item> items;
@@ skipping 34 matching lines @@
   }
 
   String classFor(Item item) {
     return item.done ? 'done' : '';
   }
 
   int remaining() {
     return items.where((item) => !item.done).length;
   }
 }