Roll Observatory packages and add a roll script

packages/quiver/test/async/create_timer_test.dart

 // Copyright 2013 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-/**
- * Testing support for dart:async.
- */
-library quiver.testing.async;
+library quiver.async.create_timer_test;
 
-import 'dart:async';
-import 'dart:collection';
+import 'package:test/test.dart';
+import 'package:quiver/async.dart';
 
-import 'package:quiver/iterables.dart';
-import 'package:quiver/time.dart';
+main() {
+  group('createTimer', () {
+    test('should be assignable to CreateTimer', () {
+      expect(createTimer, new isInstanceOf<CreateTimer>());
+    });
+  });
 
-part 'src/async/async.dart';
-part 'src/async/fake_async.dart';
+  group('createTimerPeriodic', () {
+    test('should be assignable to CreateTimerPeriodic', () {
+      expect(createTimerPeriodic, new isInstanceOf<CreateTimerPeriodic>());
+    });
+  });
+}