Expose Service Describer in Dart mojo package

mojo/dart/packages/_mojo_for_test_only/lib/math/math_calculator.mojom.dart

Index: mojo/dart/packages/_mojo_for_test_only/lib/math/math_calculator.mojom.dart
diff --git a/mojo/dart/packages/_mojo_for_test_only/lib/math/math_calculator.mojom.dart b/mojo/dart/packages/_mojo_for_test_only/lib/math/math_calculator.mojom.dart
index 8ebdd4687912aa6633862ca96c0883f7cdc6ef8e..312c05c0bbe27ae1974048ca797d818ede34ba79 100644
--- a/mojo/dart/packages/_mojo_for_test_only/lib/math/math_calculator.mojom.dart
+++ b/mojo/dart/packages/_mojo_for_test_only/lib/math/math_calculator.mojom.dart
@@ -539,13 +539,13 @@ mojom_types.MojomInterface _mathCalculatorCalculator() {
 
 class _CalculatorServiceDescription implements service_describer.ServiceDescription {
   dynamic getTopLevelInterface([Function responseFactory]) =>
-      _mathCalculatorCalculator();
+    responseFactory(_mathCalculatorCalculator());
 
   dynamic getTypeDefinition(String typeKey, [Function responseFactory]) =>
-      getAllMojomTypeDefinitions()[typeKey];
+    responseFactory(getAllMojomTypeDefinitions()[typeKey]);
 
   dynamic getAllTypeDefinitions([Function responseFactory]) =>
-      getAllMojomTypeDefinitions();
+    responseFactory(getAllMojomTypeDefinitions());
 }
 
 abstract class Calculator {
@@ -871,7 +871,7 @@ class CalculatorStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
+  static service_describer.ServiceDescription get serviceDescription =>
     new _CalculatorServiceDescription();
 }