Expose Service Describer in Dart mojo package

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

Index: mojo/dart/packages/mojo_services/lib/keyboard/keyboard.mojom.dart
diff --git a/mojo/dart/packages/mojo_services/lib/keyboard/keyboard.mojom.dart b/mojo/dart/packages/mojo_services/lib/keyboard/keyboard.mojom.dart
index 0987233bb25ee225c0cdcbe6d5509229afb69768..3d10993b3dd16ebb164643791be4081700946370 100644
--- a/mojo/dart/packages/mojo_services/lib/keyboard/keyboard.mojom.dart
+++ b/mojo/dart/packages/mojo_services/lib/keyboard/keyboard.mojom.dart
@@ -1485,11 +1485,14 @@ const int _KeyboardClient_submitName = 7;
 
 
 class _KeyboardClientServiceDescription 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 KeyboardClient {
@@ -1770,8 +1773,13 @@ class KeyboardClientStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
-    new _KeyboardClientServiceDescription();
+  static service_describer.ServiceDescription _cachedServiceDescription;
+  static service_describer.ServiceDescription get serviceDescription {
+    if (_cachedServiceDescription == null) {
+      _cachedServiceDescription = new _KeyboardClientServiceDescription();
+    }
+    return _cachedServiceDescription;
+  }
 }
 
 const int _KeyboardService_showName = 0;
@@ -1783,11 +1791,14 @@ const int _KeyboardService_setSelectionName = 4;
 
 
 class _KeyboardServiceServiceDescription 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 KeyboardService {
@@ -2018,8 +2029,13 @@ class KeyboardServiceStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
-    new _KeyboardServiceServiceDescription();
+  static service_describer.ServiceDescription _cachedServiceDescription;
+  static service_describer.ServiceDescription get serviceDescription {
+    if (_cachedServiceDescription == null) {
+      _cachedServiceDescription = new _KeyboardServiceServiceDescription();
+    }
+    return _cachedServiceDescription;
+  }
 }
 
 const int _KeyboardServiceFactory_createKeyboardServiceName = 0;
@@ -2027,11 +2043,14 @@ const int _KeyboardServiceFactory_createKeyboardServiceName = 0;
 
 
 class _KeyboardServiceFactoryServiceDescription 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 KeyboardServiceFactory {
@@ -2203,8 +2222,13 @@ class KeyboardServiceFactoryStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
-    new _KeyboardServiceFactoryServiceDescription();
+  static service_describer.ServiceDescription _cachedServiceDescription;
+  static service_describer.ServiceDescription get serviceDescription {
+    if (_cachedServiceDescription == null) {
+      _cachedServiceDescription = new _KeyboardServiceFactoryServiceDescription();
+    }
+    return _cachedServiceDescription;
+  }
 }