Trying to make preamble for d8.

tests/lib/async/future_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.
 
 library future_test;
 
 import 'package:async_helper/async_helper.dart';
 import "package:expect/expect.dart";
 import 'dart:async';
 
@@ skipping 727 matching lines @@
       return new Future<int>.value(42);
     });
 
   future.then((int val) {
       Expect.equals(val, 42);
       asyncEnd();
     });
 }
 
 main() {
+  asyncStart();
+
   testValue();
   testSync();
   testNeverComplete();
 
   testComplete();
   testCompleteWithSuccessHandlerBeforeComplete();
   testCompleteWithSuccessHandlerAfterComplete();
   testCompleteManySuccessHandlers();
   testCompleteWithError();
 
@@ skipping 32 matching lines @@
   testFutureThenThrowsAsync();
   testFutureCatchThrowsAsync();
   testFutureWhenThrowsAsync();
   testFutureCatchRethrowsAsync();
 
   testChainedFutureValue();
   testChainedFutureValueDelay();
   testChainedFutureError();
 
   testSyncFuture_i13368();
+
+  asyncEnd();
 }
 
 /// A Future that isn't recognizable as a _Future.
 class CustomFuture<T> implements Future<T> {
   Future _realFuture;
   CustomFuture(this._realFuture);
   Future then(action(result), {Function onError}) =>
       _realFuture.then(action, onError: onError);
   Future catchError(Function onError, {bool test(e)}) =>
       _realFuture.catchError(onError, test: test);
   Future whenComplete(action()) => _realFuture.whenComplete(action);
   Future timeout(Duration timeLimit, {void onTimeout()}) =>
       _realFuture.timeout(timeLimit, onTimeout: onTimeout);
   Stream asStream() => _realFuture.asStream();
   String toString() => "CustomFuture@${_realFuture.hashCode}";
   int get hashCode => _realFuture.hashCode;
 }