Expose Service Describer in Dart mojo package

mojo/dart/packages/mojo_services/lib/activity/activity.mojom.dart

Index: mojo/dart/packages/mojo_services/lib/activity/activity.mojom.dart
diff --git a/mojo/dart/packages/mojo_services/lib/activity/activity.mojom.dart b/mojo/dart/packages/mojo_services/lib/activity/activity.mojom.dart
index 744e9171e14513e3143d30f0f6ae451bdedca2ad..fc41d9f03f74ae67acb49ddea9b466088b699a35 100644
--- a/mojo/dart/packages/mojo_services/lib/activity/activity.mojom.dart
+++ b/mojo/dart/packages/mojo_services/lib/activity/activity.mojom.dart
@@ -1719,11 +1719,14 @@ const int _Activity_setRequestedOrientationName = 5;
 
 
 class _ActivityServiceDescription 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 Activity {
@@ -1968,7 +1971,7 @@ class ActivityStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
+  static service_describer.ServiceDescription get serviceDescription =>
     new _ActivityServiceDescription();
 }
 
@@ -1979,11 +1982,14 @@ const int _PathService_getCacheDirName = 2;
 
 
 class _PathServiceServiceDescription 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 PathService {
@@ -2307,7 +2313,7 @@ class PathServiceStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
+  static service_describer.ServiceDescription get serviceDescription =>
     new _PathServiceServiceDescription();
 }
 
@@ -2317,11 +2323,14 @@ const int _UserFeedback_performAuralFeedbackName = 1;
 
 
 class _UserFeedbackServiceDescription 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 UserFeedback {
@@ -2507,7 +2516,7 @@ class UserFeedbackStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
+  static service_describer.ServiceDescription get serviceDescription =>
     new _UserFeedbackServiceDescription();
 }