Make the object store visible in Observatory.

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

Index: runtime/observatory/lib/src/service/object.dart
diff --git a/runtime/observatory/lib/src/service/object.dart b/runtime/observatory/lib/src/service/object.dart
index b0be812dc5b88e1141fcadebd860afe5a48b0ae2..cb0f4c57611c3cf3d1383889acfd6571b26fa951 100644
--- a/runtime/observatory/lib/src/service/object.dart
+++ b/runtime/observatory/lib/src/service/object.dart
@@ -253,6 +253,9 @@ abstract class ServiceObject extends Observable {
             break;
         }
         break;
+      case '_ObjectStore':
+        obj = new ObjectStore._empty(owner);
+        break;
       case 'Event':
         obj = new ServiceEvent._empty(owner);
         break;
@@ -1334,6 +1337,7 @@ class Isolate extends ServiceObjectOwner {
   Map<int, Class> _classesByCid = new Map<int, Class>();
 
   @observable Library rootLibrary;
+  @observable ObjectStore objectStore;
   @observable ObservableList<Library> libraries =
       new ObservableList<Library>();
   @observable Frame topFrame;
@@ -1415,6 +1419,7 @@ class Isolate extends ServiceObjectOwner {
     _upgradeCollection(map, isolate);
     originNumber = int.parse(map['_originNumber'], onError:(_) => null);
     rootLibrary = map['rootLib'];
+    objectStore = map['_objectStore'];
     if (map['entry'] != null) {
       entry = map['entry'];
     }
@@ -1744,6 +1749,36 @@ class Isolate extends ServiceObjectOwner {
   String toString() => "Isolate($name)";
 }
 
+
+class NamedField {
+  final String name;
+  final ServiceObject value;
+  NamedField(this.name, this.value);
+}
+
+
+class ObjectStore extends ServiceObject {
+  @observable List<NamedField> fields = new List<NamedField>();
+
+  ObjectStore._empty(ServiceObjectOwner owner) : super._empty(owner);
+
+  void _update(ObservableMap map, bool mapIsRef) {
+    // Extract full properties.
+    _upgradeCollection(map, isolate);
+
+    if (mapIsRef) {
+      return;
+    }
+
+    fields.clear();
+    map['fields'].forEach((key, value) {
+      fields.add(new NamedField(key, value));
+    });
+    _loaded = true;
+  }
+}
+
+
 /// A [ServiceObject] which implements [ObservableMap].
 class ServiceMap extends ServiceObject implements ObservableMap {
   final ObservableMap _map = new ObservableMap();