Expose Service Describer in Dart mojo package

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

Index: mojo/dart/packages/mojo_services/lib/mojo/http_connection.mojom.dart
diff --git a/mojo/dart/packages/mojo_services/lib/mojo/http_connection.mojom.dart b/mojo/dart/packages/mojo_services/lib/mojo/http_connection.mojom.dart
index f55c935d8ce42804d0613795a695e436c4b7a94a..50858a3d189af332cea1c471fac5c173f5937ed7 100644
--- a/mojo/dart/packages/mojo_services/lib/mojo/http_connection.mojom.dart
+++ b/mojo/dart/packages/mojo_services/lib/mojo/http_connection.mojom.dart
@@ -641,11 +641,14 @@ const int _HttpConnection_setReceiveBufferSizeName = 1;
 
 
 class _HttpConnectionServiceDescription 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 HttpConnection {
@@ -915,8 +918,13 @@ class HttpConnectionStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
-    new _HttpConnectionServiceDescription();
+  static service_describer.ServiceDescription _cachedServiceDescription;
+  static service_describer.ServiceDescription get serviceDescription {
+    if (_cachedServiceDescription == null) {
+      _cachedServiceDescription = new _HttpConnectionServiceDescription();
+    }
+    return _cachedServiceDescription;
+  }
 }
 
 const int _HttpConnectionDelegate_onReceivedRequestName = 0;
@@ -925,11 +933,14 @@ const int _HttpConnectionDelegate_onReceivedWebSocketRequestName = 1;
 
 
 class _HttpConnectionDelegateServiceDescription 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 HttpConnectionDelegate {
@@ -1201,8 +1212,13 @@ class HttpConnectionDelegateStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
-    new _HttpConnectionDelegateServiceDescription();
+  static service_describer.ServiceDescription _cachedServiceDescription;
+  static service_describer.ServiceDescription get serviceDescription {
+    if (_cachedServiceDescription == null) {
+      _cachedServiceDescription = new _HttpConnectionDelegateServiceDescription();
+    }
+    return _cachedServiceDescription;
+  }
 }