Expose Service Describer in Dart mojo package

mojo/dart/packages/mojo_services/lib/native_support/process.mojom.dart

Index: mojo/dart/packages/mojo_services/lib/native_support/process.mojom.dart
diff --git a/mojo/dart/packages/mojo_services/lib/native_support/process.mojom.dart b/mojo/dart/packages/mojo_services/lib/native_support/process.mojom.dart
index 8f276911524d330207a3f1b4c58b974d8365cc7a..6f12e8c6b5f657357b6bc6cc703750ecd87672e9 100644
--- a/mojo/dart/packages/mojo_services/lib/native_support/process.mojom.dart
+++ b/mojo/dart/packages/mojo_services/lib/native_support/process.mojom.dart
@@ -825,11 +825,14 @@ const int _Process_spawnWithTerminalName = 1;
 
 
 class _ProcessServiceDescription 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 Process {
@@ -1109,8 +1112,13 @@ class ProcessStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
-    new _ProcessServiceDescription();
+  static service_describer.ServiceDescription _cachedServiceDescription;
+  static service_describer.ServiceDescription get serviceDescription {
+    if (_cachedServiceDescription == null) {
+      _cachedServiceDescription = new _ProcessServiceDescription();
+    }
+    return _cachedServiceDescription;
+  }
 }
 
 const int _ProcessController_waitName = 0;
@@ -1119,11 +1127,14 @@ const int _ProcessController_killName = 1;
 
 
 class _ProcessControllerServiceDescription 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 ProcessController {
@@ -1393,8 +1404,13 @@ class ProcessControllerStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
-    new _ProcessControllerServiceDescription();
+  static service_describer.ServiceDescription _cachedServiceDescription;
+  static service_describer.ServiceDescription get serviceDescription {
+    if (_cachedServiceDescription == null) {
+      _cachedServiceDescription = new _ProcessControllerServiceDescription();
+    }
+    return _cachedServiceDescription;
+  }
 }