Add step OverAwait to service protocol

runtime/observatory/tests/service/smart_next_test.dart

 // Copyright (c) 2015, 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=--error_on_bad_type --error_on_bad_override
 
 import 'package:observatory/service_io.dart';
 import 'test_helper.dart';
 import 'dart:async';
 import 'dart:developer';
 
@@ skipping 27 matching lines @@
         subscription.cancel();
         completer.complete();
       }
     });
   });
   isolate.stepOver();
   return completer.future;
 }
 
 smartNext(Isolate isolate) async {
-  if (isolate.pauseEvent.atAsyncJump) {
+  if (isolate.pauseEvent.atAsyncSuspension) {
     print("next-async");
-    List asyncStepFutures = await isolate.asyncStepOver();
-    return asyncStepFutures[Isolate.kSecondResume];
+    return asyncStepOver(isolate);
   } else {
     print("next-sync");
     return stepOverAwaitingResume(isolate);
   }
 }
 
 var tests = [
              hasStoppedAtBreakpoint, stoppedAtLine(16), // foo()
   smartNext, hasStoppedAtBreakpoint, stoppedAtLine(16), // await
   smartNext, hasStoppedAtBreakpoint, stoppedAtLine(17), // bar()
   smartNext, hasStoppedAtBreakpoint, stoppedAtLine(18), // bar()
   smartNext, hasStoppedAtBreakpoint, stoppedAtLine(19), // foo()
   smartNext, hasStoppedAtBreakpoint, stoppedAtLine(19), // await
   smartNext, hasStoppedAtBreakpoint, stoppedAtLine(20), // foo()
   smartNext, hasStoppedAtBreakpoint, stoppedAtLine(20), // await
   smartNext, hasStoppedAtBreakpoint, stoppedAtLine(21), // bar()
   resumeIsolate,
 ];
 
 main(args) => runIsolateTests(args, tests, testeeConcurrent: testMain);