Roll Observatory packages and add a roll script

initialize/lib/initialize.dart

-// Copyright (c) 2015, 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 initialize;
-
-// The `loader_replacer` transformer will replace this with a static_loader.
-import 'src/mirror_loader.dart' as loader;
-import 'dart:async';
-import 'dart:collection';
-
-part 'src/init_method.dart';
-part 'src/initializer.dart';
-
-/// Top level function which crawls the dependency graph and runs initializers.
-/// If [typeFilter] and/or [customFilter] are supplied then only those types of
-/// annotations will be parsed. If both filters are supplied they are treated
-/// as an AND.
-///
-/// If [from] is supplied then initializers will be found starting from the
-/// library at the supplied uri.
-///
-/// **Warning**: Do not use [from] directly in your code unless you are building
-/// a framework that will use a transformer to remove this argument later. This
-/// parameter is supported in Dartium, but [run] will throw if you use the
-/// argument after building an application with `pub build` or `pub serve`.
-Future run({List<Type> typeFilter, InitializerFilter customFilter, Uri from}) {
-  return _runInitQueue(loader.loadInitializers(
-      typeFilter: typeFilter, customFilter: customFilter, from: from));
-}
-
-Future _runInitQueue(Queue<Function> initializers) {
-  if (initializers.isEmpty) return new Future.value(null);
-
-  var initializer = initializers.removeFirst();
-  var val = initializer();
-  if (val is! Future) val = new Future.value(val);
-
-  return val.then((_) => _runInitQueue(initializers));
-}