Dart: Adds optional named arguments for creating bindings.

services/dart/test/echo/main.dart

Index: services/dart/test/echo/main.dart
diff --git a/services/dart/test/echo/main.dart b/services/dart/test/echo/main.dart
index 4f93a7aae454e4aed94e1a3c49c49e16c7d65af0..85ed5e226801cada9328c60ba70428b128e1efc8 100644
--- a/services/dart/test/echo/main.dart
+++ b/services/dart/test/echo/main.dart
@@ -15,15 +15,12 @@ class EchoServiceImpl implements EchoService {
 
   EchoServiceImpl(Application application, MojoMessagePipeEndpoint endpoint)
     : _application = application {
-    _stub = new EchoServiceStub.fromEndpoint(endpoint)
-            ..delegate = this
-            ..listen();
+    _stub = new EchoServiceStub.fromEndpoint(endpoint, impl: this);
   }
 
   echoString(String value, Function responseFactory) {
     if (value == "quit") {
       _stub.close();
-      _application.close();
     }
     return new Future.value(responseFactory(value));
   }
@@ -32,7 +29,9 @@ class EchoServiceImpl implements EchoService {
 class EchoApplication extends Application {
   EchoApplication.fromHandle(MojoHandle handle) : super.fromHandle(handle);
 
-  void acceptConnection(String requestorUrl, ApplicationConnection connection) {
+  void acceptConnection(String requestorUrl,
+                        ApplicationConnection connection,
+                        String resolvedUrl) {
     connection.provideService(EchoServiceName, (endpoint) =>
         new EchoServiceImpl(this, endpoint));
     connection.listen();