Automatically step past async state-machine switch for 'anext'.

runtime/observatory/tests/service/test_helper.dart

 // Copyright (c) 2013, 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.
-// VMOptions=--compile_all --error_on_bad_type --error_on_bad_override --checked
 
 library test_helper;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 
 bool _isWebSocketDisconnect(e) {
@@ skipping 145 matching lines @@
   // Set up a listener to wait for breakpoint events.
   Completer completer = new Completer();
   isolate.vm.getEventStream(VM.kDebugStream).then((stream) {
     var subscription;
     subscription = stream.listen((ServiceEvent event) {
         print("Event: $event");
         if (event.kind == ServiceEvent.kPauseBreakpoint) {
           print('Breakpoint reached');
           subscription.cancel();
           if (completer != null) {
-            completer.complete(isolate);
+            // Reload to update isolate.pauseEvent.
+            completer.complete(isolate.reload());
             completer = null;
           }
         }
     });
 
     // Pause may have happened before we subscribed.
     isolate.reload().then((_) {
       if ((isolate.pauseEvent != null) &&
          (isolate.pauseEvent.kind == ServiceEvent.kPauseBreakpoint)) {
         // Already waiting at a breakpoint.
@@ skipping 107 matching lines @@
       }, onError: (e, st) {
         process.requestExit();
         if (!_isWebSocketDisconnect(e)) {
           print('Unexpected exception in service tests: $e $st');
           throw e;
         }
       });
     });
   }
 }