Roll polymer packages to version 0.3.4

pkg/polymer/test/build/common.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 polymer.test.build.common;
 
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 import 'package:stack_trace/stack_trace.dart';
@@ skipping 169 matching lines @@
       '  final String tagName;\n'
       '  const CustomTag(this.tagName);'
       '}\n'
       'class InitMethodAnnotation { const InitMethodAnnotation(); }\n'
       'const initMethod = const InitMethodAnnotation();\n',
 
   'polymer|lib/src/instance.dart':
       'part of polymer;\n'
       'class PublishedProperty { const PublishedProperty(); }\n'
       'const published = const PublishedProperty();\n'
+      'class ComputedProperty {'
+      '  final String expression;\n'
+      '  const ComputedProperty();'
+      '}\n'
       'class ObserveProperty { const ObserveProperty(); }\n'
       'abstract class Polymer {}\n'
       'class PolymerElement extends HtmlElement with Polymer {}\n',
 
   'polymer|lib/init.dart':
       'library polymer.init;\n'
       'import "package:polymer/polymer.dart";\n'
       'main() {};\n',
 
   'observe|lib/observe.dart':
       'library observe;\n'
       'export "src/metadata.dart";',
 
   'observe|lib/src/metadata.dart':
       'library observe.src.metadata;\n'
       'class ObservableProperty { const ObservableProperty(); }\n'
       'const observable = const ObservableProperty();\n',
 };