Roll Observatory packages and add a roll script

web_components/lib/src/init.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 web_components.src.init;
-
-import 'dart:async';
-import 'package:initialize/initialize.dart' show InitializerFilter;
-import 'package:web_components/web_components.dart';
-import 'mirror_initializer.dart' as init;
-export 'mirror_initializer.dart' show deployMode;
-
-/// Performs html import aware initialization by crawling all imported documents
-/// and initializing any script tags which appear in them.
-///
-/// By default, this will run all [HtmlImport] initializers, followed in a 2nd
-/// phase by all [CustomElement] and [CustomElementProxy] initializers. Then,
-/// unless [initAll] is [false], it will run all remaining initializers.
-///
-/// If a [typeFilter] or [customFilter] are supplied, only one phase is ran
-/// with the supplied filters.
-Future initWebComponents({List<Type> typeFilter, InitializerFilter customFilter,
-    bool initAll: true}) {
-  if (typeFilter != null || customFilter != null) {
-    return init.run(typeFilter: typeFilter, customFilter: customFilter);
-  } else {
-    return init
-        .run(typeFilter: [HtmlImport])
-        .then((_) => init.run(typeFilter: [CustomElement, CustomElementProxy]))
-        .then((_) => initAll ? init.run() : null);
-  }
-}