move polymer.dart into dart svn

samples/third_party/todomvc/web/todo_row.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 todo_row;
+
+import 'package:polymer/polymer.dart';
+import 'model.dart';
+
+@CustomTag('todo-row')
+class TodoRow extends PolymerElement with ObservableMixin {
+  @observable Todo todo;
+
+  bool get applyAuthorStyles => true;
+
+  // TODO(sigmund,terry): bring back scoped-css polyfills
+
+  void created() {
+    super.created();
+    var root = getShadowRoot("todo-row");
+    var label = root.query('#label').xtag;
+    var item = root.query('.todo-item');
+
+    bindCssClass(item, 'completed', this, 'todo.done');
+    bindCssClass(item, 'editing', label, 'editing');
+  }
+
+  void removeTodo() => appModel.todos.remove(todo);
+}