Roll Observatory packages and add a roll script

packages/polymer/test/template_distribute_dynamic_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:async';
+import 'dart:html';
+import 'package:polymer/polymer.dart';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+
+@CustomTag('x-test')
+class XTest extends PolymerElement {
+  @observable List list;
+
+  final _attached = new Completer();
+  Future onTestDone;
+
+  XTest.created() : super.created() {
+    onTestDone = _attached.future.then(_runTest);
+  }
+
+  attached() {
+    super.attached();
+    _attached.complete();
+  }
+
+  _runTest(_) {
+    list = [{'name': 'foo'}, {'name': 'bar'}];
+    return new Future(() {
+      // tickle SD polyfill
+      offsetHeight;
+      var children = this.$['echo'].children;
+      expect(children[0].localName, 'template',
+          reason: 'shadowDOM dynamic distribution via template');
+      expect(children[1].text, 'foo',
+          reason: 'shadowDOM dynamic distribution via template');
+      expect(children[2].text, 'bar',
+          reason: 'shadowDOM dynamic distribution via template');
+      expect(children.length, 3, reason: 'expected number of children');
+    });
+  }
+}
+
+main() => initPolymer().then((zone) => zone.run(() {
+  useHtmlConfiguration();
+
+  setUp(() => Polymer.onReady);
+
+  test('inserted called', () => (querySelector('x-test') as XTest).onTestDone);
+}));