Expose Service Describer in Dart mojo package

mojo/dart/apptests/dart_apptests/lib/main.dart

Index: mojo/dart/apptests/dart_apptests/lib/main.dart
diff --git a/mojo/dart/apptests/dart_apptests/lib/main.dart b/mojo/dart/apptests/dart_apptests/lib/main.dart
index 9fff4805fda6817d68d4ac59b95ba7f9c449f07b..c84c4d13f679029877dfbdc153347380f260a33a 100644
--- a/mojo/dart/apptests/dart_apptests/lib/main.dart
+++ b/mojo/dart/apptests/dart_apptests/lib/main.dart
@@ -8,9 +8,10 @@ import 'package:mojo_apptest/apptest.dart';
 import 'src/connect_to_loader_apptests.dart' as connect_to_loader_apptests;
 import 'src/echo_apptests.dart' as echo;
 import 'src/file_apptests.dart' as file;
-import 'src/pingpong_apptests.dart' as pingpong;
 import 'src/io_http_apptests.dart' as io_http;
 import 'src/io_internet_address_apptests.dart' as io_internet_address;
+import 'src/pingpong_apptests.dart' as pingpong;
+import 'src/service_describer_apptests.dart' as service_describer;
 import 'src/uri_apptests.dart' as uri;
 import 'src/versioning_apptests.dart' as versioning;
 
@@ -22,6 +23,7 @@ main(List args) {
     io_internet_address.tests,
     io_http.tests,
     pingpong.pingpongApptests,
+    service_describer.tests,
     uri.tests,
     versioning.tests
   ];