Big merge from experimental to bleeding edge.

pkg/intl/lib/src/file_data_reader.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 a reader that accesses data from local files, so it can't
  * be run in the browser.
  */
 
 library file_data_reader;
 
+import 'dart:async';
 import 'dart:io';
 import 'intl_helpers.dart';
 
 class FileDataReader implements LocaleDataReader {
 
   /// The base path from which we will read data.
   String path;
 
   FileDataReader(this.path);
 
   /// Read the locale data found for [locale] on our [path].
   Future read(String locale) {
     var file = new File('$path$locale.json');
     return file.readAsString();
   }
 }