Big merge from experimental to bleeding edge.

tests/utils/recursive_import_test.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.
 
 // Test of "recursive" imports using the dart2js compiler API.
 
+import 'dart:async';
 import '../../sdk/lib/_internal/compiler/compiler.dart';
 import 'dart:uri';
 
 const CORE_LIB = """
 library core;
 class Object{}
 class bool {}
 class num {}
 class int {}
 class double{}
@@ skipping 67 matching lines @@
                         new Uri.fromComponents(scheme: 'lib', path: '/'),
                         new Uri.fromComponents(scheme: 'package', path: '/'),
                         provider, handler).value;
   Expect.isNull(code);
   Expect.isTrue(10 < count);
   // Two warnings for each time RECURSIVE_MAIN is read, except the
   // first time.
   Expect.equals(2 * (count - 1), warningCount);
   Expect.equals(1, errorCount);
 }