Incoming references service request and UI.

runtime/bin/vmservice/observatory/lib/src/elements/instance_view.dart

Index: runtime/bin/vmservice/observatory/lib/src/elements/instance_view.dart
diff --git a/runtime/bin/vmservice/observatory/lib/src/elements/instance_view.dart b/runtime/bin/vmservice/observatory/lib/src/elements/instance_view.dart
index ac9caef8666e45bf743802b35a871726db0b1391..be118f8a28eda5721a8ec0958877bf53ea5a50ec 100644
--- a/runtime/bin/vmservice/observatory/lib/src/elements/instance_view.dart
+++ b/runtime/bin/vmservice/observatory/lib/src/elements/instance_view.dart
@@ -13,6 +13,7 @@ import 'package:polymer/polymer.dart';
 class InstanceViewElement extends ObservatoryElement {
   @published ServiceMap instance;
   @published ServiceMap path;
+  @published ServiceMap inboundReferences;
   @observable int retainedBytes = null;
 
   InstanceViewElement.created() : super.created();
@@ -37,6 +38,13 @@ class InstanceViewElement extends ObservatoryElement {
         });
   }
 
+  Future<ServiceObject> fetchInboundReferences(var arg) {
+    return instance.isolate.get(instance.id + "/inbound_references?limit=$arg")
+        .then((ServiceObject obj) {
+           inboundReferences = obj;
+        });
+  }
+  
   void refresh(var done) {
     instance.reload().whenComplete(done);
   }