Update the navbar in the observatory

runtime/bin/vmservice/client/lib/src/observatory_elements/function_view.dart

 // Copyright (c) 2013, 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.
 
 library function_view_element;
 
+import 'package:logging/logging.dart';
 import 'package:polymer/polymer.dart';
 import 'observatory_element.dart';
 
 @CustomTag('function-view')
 class FunctionViewElement extends ObservatoryElement {
   @published Map function;
   FunctionViewElement.created() : super.created();
+
+  void refresh(var done) {
+    var url = app.locationManager.currentIsolateRelativeLink(function['id']);
+    app.requestManager.requestMap(url).then((map) {
+        function = map;
+    }).catchError((e, trace) {
+        Logger.root.severe('Error while refreshing field-view: $e\n$trace');
+    }).whenComplete(done);
+  }
 }