Retaining path in Observatory.

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

Index: runtime/bin/vmservice/client/lib/src/elements/instance_view.dart
===================================================================
--- runtime/bin/vmservice/client/lib/src/elements/instance_view.dart	(revision 36435)
+++ runtime/bin/vmservice/client/lib/src/elements/instance_view.dart	(working copy)
@@ -12,6 +12,7 @@
 @CustomTag('instance-view')
 class InstanceViewElement extends ObservatoryElement {
   @published ServiceMap instance;
+  @published ServiceMap path;
 
   InstanceViewElement.created() : super.created();
 
@@ -25,6 +26,13 @@
     return instance.isolate.get(instance.id + "/retained");
   }
 
+  Future<ServiceObject> retainingPath(String arg) {
+    return instance.isolate.get(instance.id + "/retaining_path?limit=$arg")
+        .then((ServiceObject obj) {
+          path = obj;
+        });
+  }
+
   void refresh(var done) {
     instance.reload().whenComplete(done);
   }