Roll Observatory packages and add a roll script

packages/polymer/test/instance_attrs_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';
+
+// Note: we use @CustomTag to make this type reflectable.
+@CustomTag('my-element')
+class MyElement extends PolymerElement {
+  MyElement.created() : super.created();
+
+  // This is here so that [attributes] can be read via mirrors in polymer
+  // expressions (@CustomTag in this class makes the attribute reflectable).
+  get attributes => super.attributes;
+}
+
+main() => initPolymer().then((zone) => zone.run(() {
+  useHtmlConfiguration();
+
+  setUp(() => Polymer.onReady);
+
+  test('attributes were deserialized', () {
+    var elem = querySelector('my-element');
+
+    expect(elem.attributes, {'foo': '123', 'bar': 'hi', 'baz': 'world'},
+        reason: 'attributes should be copied to instance');
+
+    var text = elem.shadowRoot.text;
+    // Collapse adjacent whitespace like a browser would:
+    text = text.replaceAll('\n', ' ').replaceAll(new RegExp(r'\s+'), ' ');
+
+    expect(text, " foo: 123 bar: hi baz: world ",
+        reason: 'text should match expected HTML template');
+  });
+}));