Bring the rest of the polymer.dart code from github.

samples/third_party/todomvc/web/editable_label.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 editable_label;
 
 import 'dart:html';
 import 'package:polymer/polymer.dart';
 
 /**
@@ skipping 27 matching lines @@
     editing = false;
   }
 
   void maybeCancel(KeyboardEvent e) {
     if (e.keyCode == KeyCode.ESC) {
       editing = false;
     }
   }
 }
 
-@polymerInitMethod
-void _init() {
+void main() {
   registerPolymerElement('editable-label', () => new EditableLabel());
 }