Mojom runtime type info: New implementation for Dart.

mojo/dart/apptests/dart_apptests/lib/src/pingpong_apptests.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.
 
 library pingpong_apptests;
 
 import 'dart:async';
 
 import 'package:mojo_apptest/apptest.dart';
 import 'package:mojo/application.dart';
@@ skipping 98 matching lines @@
 
       targetServiceProxy.ptr.ping(100);
       pongValue = await pingPongClient.waitForPong();
       expect(pongValue, equals(101));
 
       await pingPongClient.stub.close();
       await targetServiceProxy.close();
       await pingPongServiceProxy.close();
     });
 
+    // Note(rudominer) Per request from @zra in
+    // https://codereview.chromium.org/1753013002, temporarily disabling this
+    // test because we believe it may be causing flakiness in
+    // service_describer_apptests.dart which is listed immediately following
+    // this test in dart_apptests/lib/main.dart.
+    /*
     test('Quit', () async {
       var pingPongServiceProxy = new PingPongServiceProxy.unbound();
       application.connectToService(
           "mojo:dart_pingpong", pingPongServiceProxy);
       pingPongServiceProxy.ptr.quit();
       await pingPongServiceProxy.close();
     });
+    */
   });
 }