Roll Observatory packages and add a roll script

intl/lib/src/date_format_internal.dart

-// Copyright (c) 2012, 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.
-
-/**
- * This contains internal implementation details of the date formatting code
- * which are exposed as public functions because they must be called by other
- * libraries in order to configure the source for the locale data. We don't want
- * them exposed as public API functions in the date formatting library, so they
- * are put in a separate library here. These are for internal use only. User
- * code should import one of the `date_symbol_data...` libraries and call the
- * `initializeDateFormatting` method exposed there.
- */
-
-library date_format_internal;
-
-import 'dart:async';
-import 'intl_helpers.dart';
-import '../date_symbols.dart';
-
-/**
- * This holds the symbols to be used for date/time formatting, indexed
- * by locale. Note that it will be set differently during initialization,
- * depending on what implementation we are using. By default, it is initialized
- * to an instance of UninitializedLocaleData, so any attempt to use it will
- * result in an informative error message.
- */
-var dateTimeSymbols = new UninitializedLocaleData(
-    'initializeDateFormatting(<locale>)', en_USSymbols);
-
-/**
- * This holds the patterns used for date/time formatting, indexed
- * by locale. Note that it will be set differently during initialization,
- * depending on what implementation we are using. By default, it is initialized
- * to an instance of UninitializedLocaleData, so any attempt to use it will
- * result in an informative error message.
- */
-var dateTimePatterns = new UninitializedLocaleData(
-    'initializeDateFormatting(<locale>)', en_USPatterns);
-
-/**
- * Initialize the symbols dictionary. This should be passed a function that
- * creates and returns the symbol data. We take a function so that if
- * initializing the data is an expensive operation it need only be done once,
- * no matter how many times this method is called.
- */
-void initializeDateSymbols(Function symbols) {
-  if (dateTimeSymbols is UninitializedLocaleData) {
-    dateTimeSymbols = symbols();
-  }
-}
-
-/**
- * Initialize the patterns dictionary. This should be passed a function that
- * creates and returns the pattern data. We take a function so that if
- * initializing the data is an expensive operation it need only be done once,
- * no matter how many times this method is called.
- */
-void initializeDatePatterns(Function patterns) {
-  if (dateTimePatterns is UninitializedLocaleData) {
-    dateTimePatterns = patterns();
-  }
-}
-
-Future initializeIndividualLocaleDateFormatting(Function init) {
-  return init(dateTimeSymbols, dateTimePatterns);
-}