Expose Service Describer in Dart mojo package

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

Index: mojo/dart/packages/mojo_services/lib/mojo/ui/views.mojom.dart
diff --git a/mojo/dart/packages/mojo_services/lib/mojo/ui/views.mojom.dart b/mojo/dart/packages/mojo_services/lib/mojo/ui/views.mojom.dart
index d00a29a0fdea9face71187fe6022e15602bf41ec..a6184860c53b3f73396e4504ebe58badb39556b2 100644
--- a/mojo/dart/packages/mojo_services/lib/mojo/ui/views.mojom.dart
+++ b/mojo/dart/packages/mojo_services/lib/mojo/ui/views.mojom.dart
@@ -1205,11 +1205,14 @@ const int _ViewOwner_getTokenName = 0;
 
 
 class _ViewOwnerServiceDescription 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 ViewOwner {
@@ -1421,8 +1424,13 @@ class ViewOwnerStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
-    new _ViewOwnerServiceDescription();
+  static service_describer.ServiceDescription _cachedServiceDescription;
+  static service_describer.ServiceDescription get serviceDescription {
+    if (_cachedServiceDescription == null) {
+      _cachedServiceDescription = new _ViewOwnerServiceDescription();
+    }
+    return _cachedServiceDescription;
+  }
 }
 
 const int _View_onLayoutName = 0;
@@ -1431,11 +1439,14 @@ const int _View_onChildUnavailableName = 1;
 
 
 class _ViewServiceDescription 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 View {
@@ -1705,8 +1716,13 @@ class ViewStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
-    new _ViewServiceDescription();
+  static service_describer.ServiceDescription _cachedServiceDescription;
+  static service_describer.ServiceDescription get serviceDescription {
+    if (_cachedServiceDescription == null) {
+      _cachedServiceDescription = new _ViewServiceDescription();
+    }
+    return _cachedServiceDescription;
+  }
 }
 
 const int _ViewHost_getTokenName = 0;
@@ -1720,11 +1736,14 @@ const int _ViewHost_layoutChildName = 6;
 
 
 class _ViewHostServiceDescription 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 ViewHost {
@@ -2070,8 +2089,13 @@ class ViewHostStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
-    new _ViewHostServiceDescription();
+  static service_describer.ServiceDescription _cachedServiceDescription;
+  static service_describer.ServiceDescription get serviceDescription {
+    if (_cachedServiceDescription == null) {
+      _cachedServiceDescription = new _ViewHostServiceDescription();
+    }
+    return _cachedServiceDescription;
+  }
 }