Big merge from experimental to bleeding edge.

tests/standalone/io/http_shutdown_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.
 //
 
-import "dart:isolate";
+import "dart:async";
 import "dart:io";
 
 void test1(int totalConnections) {
   // Server which just closes immediately.
   HttpServer server = new HttpServer();
   server.listen("127.0.0.1", 0, backlog: totalConnections);
   server.defaultRequestHandler = (HttpRequest request, HttpResponse response) {
     response.outputStream.close();
   };
 
@@ skipping 161 matching lines @@
   test1(10);
   test2(1, 10);
   test2(10, 10);
   test2(10, 1000);
   test3(1);
   test3(10);
   test4();
   test5(1);
   test5(10);
 }