Dart: Wait to handle events on a Stub until it makes sense to do it.

mojo/dart/apptests/test_apps/pingpong/lib/main.dart

 // Copyright 2015 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 'dart:async';
 
 import 'package:mojo/application.dart';
 import 'package:mojo/bindings.dart';
 import 'package:mojo/core.dart';
 
@@ skipping 82 matching lines @@
     var targetServiceProxy = new PingPongServiceProxy.unbound();
     _application.connectToService(
         "mojo:dart_pingpong_target", targetServiceProxy);
 
     // Pass along the interface request to another implementation of the
     // service.
     targetServiceProxy.ptr.getPingPongService(serviceStub);
     targetServiceProxy.close();
   }
 
+  getPingPongServiceDelayed(PingPongServiceStub serviceStub) {
+    Timer.run(() {
+      var endpoint = serviceStub.unbind();
+      new Timer(const Duration(milliseconds: 10), () {
+        var targetServiceProxy = new PingPongServiceProxy.unbound();
+        _application.connectToService(
+            "mojo:dart_pingpong_target", targetServiceProxy);
+
+        // Pass along the interface request to another implementation of the
+        // service.
+        serviceStub.bind(endpoint);
+        targetServiceProxy.ptr.getPingPongService(serviceStub);
+        targetServiceProxy.close();
+      });
+    });
+  }
+
   void quit() {}
 }
 
 class PingPongApplication extends Application {
   PingPongApplication.fromHandle(MojoHandle handle) : super.fromHandle(handle);
 
   @override
   void acceptConnection(String requestorUrl, String resolvedUrl,
       ApplicationConnection connection) {
     // No services are required from the remote end.
     connection.remoteServiceProvider.close();
 
     connection.provideService(PingPongService.serviceName,
         (endpoint) => new PingPongServiceImpl(this, endpoint),
         description: PingPongServiceStub.serviceDescription);
   }
 }
 
 main(List args, Object handleToken) {
   MojoHandle appHandle = new MojoHandle(handleToken);
   new PingPongApplication.fromHandle(appHandle)
     ..onError = ((_) {
       MojoHandle.reportLeakedHandles();
     });
 }