Changes in polymer-expressions to prepare for codegen in polymer:

pkg/polymer/test/prop_attr_bind_reflection_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.
 
 import 'dart:html';
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
 import 'package:polymer/polymer.dart';
 
 @CustomTag('my-child-element')
 class MyChildElement extends PolymerElement {
   @published int camelCase;
   @published int lowercase;
 
+  // TODO(sigmund): remove once codegen in polymer is turned on.
+  @reflectable get attributes => super.attributes;
+
   MyChildElement.created() : super.created();
 
   // Make this a no-op, so we can verify the initial
   // reflectPropertyToAttribute works.
   observeAttributeProperty(name) { }
 }
 
 @CustomTag('my-element')
 class MyElement extends PolymerElement {
   @observable int volume = 11;
@@ skipping 10 matching lines @@
   test('attribute reflected to property name', () {
     var child = querySelector('my-element')
         .shadowRoot.querySelector('my-child-element');
     expect(child.lowercase, 11);
     expect(child.camelCase, 11);
 
     expect('11', child.attributes['lowercase']);
     expect('11', child.attributes['camelcase']);
   });
 }