Expose Service Describer in Dart mojo package

mojo/dart/packages/mojo_services/lib/mojo/ui/input_dispatcher.mojom.dart

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 library input_dispatcher_mojom;
 
 import 'dart:async';
 
 import 'package:mojo/bindings.dart' as bindings;
 import 'package:mojo/core.dart' as core;
@@ skipping 76 matching lines @@
 }
 
 
 
 
 const int _InputDispatcher_dispatchEventName = 0;
 
 
 
 class _InputDispatcherServiceDescription implements service_describer.ServiceDescription {
-  dynamic getTopLevelInterface([Function responseFactory]) => null;
+  dynamic getTopLevelInterface([Function responseFactory]) =>
+      responseFactory(null);
 
-  dynamic getTypeDefinition(String typeKey, [Function responseFactory]) => null;
+  dynamic getTypeDefinition(String typeKey, [Function responseFactory]) =>
+      responseFactory(null);
 
-  dynamic getAllTypeDefinitions([Function responseFactory]) => null;
+  dynamic getAllTypeDefinitions([Function responseFactory]) =>
+      responseFactory(null);
 }
 
 abstract class InputDispatcher {
   static const String serviceName = "mojo::ui::InputDispatcher";
   void dispatchEvent(input_events_mojom.Event event);
 }
 
 
 class _InputDispatcherProxyImpl extends bindings.Proxy {
   _InputDispatcherProxyImpl.fromEndpoint(
@@ skipping 150 matching lines @@
     _impl = d;
   }
 
   String toString() {
     var superString = super.toString();
     return "InputDispatcherStub($superString)";
   }
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
+  static service_describer.ServiceDescription get serviceDescription =>
     new _InputDispatcherServiceDescription();
 }