Expose Service Describer in Dart mojo package

mojo/dart/apptests/test_apps/echo_with_service_describer/BUILD.gn

Index: mojo/dart/apptests/test_apps/echo_with_service_describer/BUILD.gn
diff --git a/examples/dart/device_info/BUILD.gn b/mojo/dart/apptests/test_apps/echo_with_service_describer/BUILD.gn
similarity index 67%
copy from examples/dart/device_info/BUILD.gn
copy to mojo/dart/apptests/test_apps/echo_with_service_describer/BUILD.gn
index 8626bdb081e800cf654dd8e5c3bc0925aeb39007..146a3b57f7f7772e9b4216d9253cee12638ec7e4 100644
--- a/examples/dart/device_info/BUILD.gn
+++ b/mojo/dart/apptests/test_apps/echo_with_service_describer/BUILD.gn
@@ -1,12 +1,12 @@
-# Copyright 2015 The Chromium Authors. All rights reserved.
+# Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//mojo/public/dart/rules.gni")
 
-dart_pkg("device_info") {
+dart_pkg("echo_with_service_describer") {
   apps = [ [
-        "dart_device_info",
+        "dart_echo_with_service_describer",
         "lib/main.dart",
       ] ]
   sources = [