Async-step, first cut.

runtime/observatory/lib/src/service/object.dart

 // Copyright (c) 2014, 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.
 
 part of service;
 
 /// Helper function for canceling a Future<StreamSubscription>.
 Future cancelFutureSubscription(
     Future<StreamSubscription> subscriptionFuture) async {
   if (subscriptionFuture != null) {
@@ skipping 1604 matching lines @@
   ServiceEvent._empty(ServiceObjectOwner owner) : super._empty(owner);
 
   ServiceEvent.connectionClosed(this.reason) : super._empty(null) {
     kind = kConnectionClosed;
   }
 
   @observable String kind;
   @observable Breakpoint breakpoint;
   @observable Frame topFrame;
   @observable Instance exception;
+  @observable Instance asyncContinuation;
   @observable ServiceObject inspectee;
   @observable ByteData data;
   @observable int count;
   @observable String reason;
   @observable String exceptions;
   @observable String bytesAsString;
   int chunkIndex, chunkCount, nodeCount;
 
   @observable bool get isPauseEvent {
     return (kind == kPauseStart ||
@@ skipping 19 matching lines @@
     if (map['pauseBreakpoints'] != null) {
       var pauseBpts = map['pauseBreakpoints'];
       if (pauseBpts.length > 0) {
         breakpoint = pauseBpts[0];
       }
     }
     topFrame = map['topFrame'];
     if (map['exception'] != null) {
       exception = map['exception'];
     }
+    if (map['_asyncContinuation'] != null) {
+      asyncContinuation = map['_asyncContinuation'];
+    }
     if (map['inspectee'] != null) {
       inspectee = map['inspectee'];
     }
     if (map['_data'] != null) {
       data = map['_data'];
     }
     if (map['chunkIndex'] != null) {
       chunkIndex = map['chunkIndex'];
     }
     if (map['chunkCount'] != null) {
@@ skipping 1905 matching lines @@
     var v = list[i];
     if ((v is ObservableMap) && _isServiceMap(v)) {
       list[i] = owner.getFromMap(v);
     } else if (v is ObservableList) {
       _upgradeObservableList(v, owner);
     } else if (v is ObservableMap) {
       _upgradeObservableMap(v, owner);
     }
   }
 }