Dart: Adds optional named arguments for creating bindings.

services/dart/test/pingpong/main.dart

Index: services/dart/test/pingpong/main.dart
diff --git a/services/dart/test/pingpong/main.dart b/services/dart/test/pingpong/main.dart
index 9b04761c0ffc61254926e4ad3d9ff53440643838..9f7485d74bca8b3ab7f03b2414ffdba5c9ef212d 100644
--- a/services/dart/test/pingpong/main.dart
+++ b/services/dart/test/pingpong/main.dart
@@ -16,7 +16,7 @@ class PingPongClientImpl implements PingPongClient {
 
   PingPongClientImpl.unbound(this._count, this._completer)
       : stub = new PingPongClientStub.unbound() {
-    stub.delegate = this;
+    stub.impl = this;
   }
 
   void pong(int pongValue) {
@@ -34,19 +34,17 @@ class PingPongServiceImpl implements PingPongService {
 
   PingPongServiceImpl(Application application, MojoMessagePipeEndpoint endpoint)
       : _application = application {
-    _stub = new PingPongServiceStub.fromEndpoint(endpoint)
-            ..delegate = this
-            ..listen();
+    _stub = new PingPongServiceStub.fromEndpoint(endpoint, impl: this);
   }
 
   PingPongServiceImpl.fromStub(this._stub) {
-    _stub.delegate = this;
+    _stub.impl = this;
   }
 
   listen() => _stub.listen();
 
   void setClient(ProxyBase proxyBase) {
-    assert(_pingPongClient== null);
+    assert(_pingPongClient == null);
     _pingPongClient = proxyBase;
   }
 
@@ -61,7 +59,7 @@ class PingPongServiceImpl implements PingPongService {
       return responseFactory(false);
     }
     var completer = new Completer();
-    var pingPongService= new PingPongServiceProxy.unbound();
+    var pingPongService = new PingPongServiceProxy.unbound();
     _application.connectToService(url, pingPongService);
 
     var pingPongClient = new PingPongClientImpl.unbound(count, completer);
@@ -73,13 +71,13 @@ class PingPongServiceImpl implements PingPongService {
     }
     await completer.future;
     pingPongService.ptr.quit();
+    pingPongService.close();
 
     return responseFactory(true);
   }
 
-  Future pingTargetService(ProxyBase proxyBase,
-                           int count,
-                           Function responseFactory) async {
+  Future pingTargetService(ProxyBase proxyBase, int count,
+      Function responseFactory) async {
     var pingPongService = proxyBase;
     var completer = new Completer();
     var client = new PingPongClientImpl.unbound(count, completer);
@@ -91,6 +89,7 @@ class PingPongServiceImpl implements PingPongService {
     }
     await completer.future;
     pingPongService.ptr.quit();
+    pingPongService.close();
 
     return responseFactory(true);
   }
@@ -105,9 +104,7 @@ class PingPongServiceImpl implements PingPongService {
       _pingPongClient = null;
     }
     _stub.close();
-    if (_application != null) {
-      _application.close();
-    }
+    _stub = null;
   }
 }
 
@@ -116,8 +113,9 @@ class PingPongApplication extends Application {
 
   @override
   void acceptConnection(String requestorUrl, String resolvedUrl,
-                        ApplicationConnection connection) {
-    connection.provideService(PingPongServiceName,
+      ApplicationConnection connection) {
+    connection.provideService(
+        PingPongServiceName,
         (endpoint) => new PingPongServiceImpl(this, endpoint));
     connection.listen();
   }