Big merge from experimental to bleeding edge.

sdk/lib/async/async.dart

Index: sdk/lib/async/async.dart
diff --git a/sdk/lib/async/async.dart b/sdk/lib/async/async.dart
new file mode 100644
index 0000000000000000000000000000000000000000..220761cfe26c1507b531e758cffda3b20f86d9d1
--- /dev/null
+++ b/sdk/lib/async/async.dart
@@ -0,0 +1,17 @@
+// 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.
+
+library dart.async;
+
+part 'async_error.dart';
+part 'future.dart';
+part 'future_impl.dart';
+part 'merge_stream.dart';
+part 'signal.dart';
+part 'stream.dart';
+part 'stream_controller.dart';
+part 'stream_impl.dart';
+part 'stream_pipe.dart';
+part 'string_transform.dart';
+part 'timer.dart';