Big merge from experimental to bleeding edge.

pkg/intl/lib/date_symbol_data_file.dart

Index: pkg/intl/lib/date_symbol_data_file.dart
diff --git a/pkg/intl/lib/date_symbol_data_file.dart b/pkg/intl/lib/date_symbol_data_file.dart
index 2a5e2004aa48bcc3718d9a400758c9899c279370..32a5cd431ce8a117bed22464b5cd899fa0f86698 100644
--- a/pkg/intl/lib/date_symbol_data_file.dart
+++ b/pkg/intl/lib/date_symbol_data_file.dart
@@ -9,6 +9,7 @@
 
 library date_symbol_data_json;
 
+import 'dart:async';
 import "date_symbols.dart";
 import "src/lazy_locale_data.dart";
 import 'src/date_format_internal.dart';
@@ -41,4 +42,4 @@ Future initializeDateFormatting(String locale, String path) {
 /** Defines how new date symbol entries are created. */
 DateSymbols _createDateSymbol(Map map) {
   return new DateSymbols.deserializeFromMap(map);
-}
+}