Add dart:io view to the observatory.

runtime/bin/vmservice/client/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;
 
 /// A [ServiceObject] is an object known to the VM service and is tied
 /// to an owning [Isolate].
 abstract class ServiceObject extends Observable {
   /// The owner of this [ServiceObject].  This can be an [Isolate], a
@@ skipping 482 matching lines @@
 
   String get link => _id;
   String get hashLink => '#/$_id';
 
   @observable ServiceMap pauseEvent = null;
   bool get _isPaused => pauseEvent != null;
 
   @observable bool running = false;
   @observable bool idle = false;
   @observable bool loading = true;
+  @observable bool ioEnabled = false;
 
   Map<String,ServiceObject> _cache = new Map<String,ServiceObject>();
   final TagProfile tagProfile = new TagProfile(20);
 
   Isolate._empty(ServiceObjectOwner owner) : super._empty(owner) {
     assert(owner is VM);
   }
 
   /// Creates a link to [id] relative to [this].
   @reflectable String relativeLink(String id) => '${this.id}/$id';
@@ skipping 179 matching lines @@
                       timerMap['time_creating_snapshot'] +
                       timerMap['time_isolate_initialization'] +
                       timerMap['time_bootstrap']);
     timers['dart'] = timerMap['time_dart_execution'];
 
     newHeapUsed = map['heap']['usedNew'];
     oldHeapUsed = map['heap']['usedOld'];
     newHeapCapacity = map['heap']['capacityNew'];
     oldHeapCapacity = map['heap']['capacityOld'];
 
+    List features = map['features'];
+    if (features != null) {
+      for (var feature in features) {
+        if (feature == 'io') {
+          ioEnabled = true;
+        }
+      }
+    }
     // Isolate status
     pauseEvent = map['pauseEvent'];
     running = (!_isPaused && map['topFrame'] != null);
     idle = (!_isPaused && map['topFrame'] == null);
     error = map['error'];
 
     libraries.clear();
     for (var lib in map['libraries']) {
       libraries.add(lib);
     }
@@ skipping 795 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);
     }
   }
 }