Dart: Reorganize files

services/dart/test/pingpong_target/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';
-
-import 'package:_mojo_for_test_only/test/pingpong_service.mojom.dart';
-
-class PingPongServiceImpl implements PingPongService {
-  PingPongServiceStub _stub;
-  Application _application;
-  PingPongClientProxy _pingPongClient;
-
-  PingPongServiceImpl(this._application, MojoMessagePipeEndpoint endpoint) {
-    _stub = new PingPongServiceStub.fromEndpoint(endpoint, this);
-  }
-
-  void setClient(ProxyBase proxyBase) {
-    assert(_pingPongClient == null);
-    _pingPongClient = proxyBase;
-  }
-
-  void ping(int pingValue) => _pingPongClient.ptr.pong(pingValue + 1);
-
-  // These methods are unimplemented; they merely throw on invocation.
-  dynamic pingTargetUrl(String url, int count, [Function responseFactory]) =>
-      throw "Unimplemented";
-  dynamic pingTargetService(
-      Object service, int count, [Function responseFactory]) =>
-      throw "Unimplemented";
-  void getPingPongService(Object service) => throw "Unimplemented";
-
-  void quit() {
-    if (_pingPongClient != null) {
-      _pingPongClient.close();
-      _pingPongClient = null;
-    }
-    _stub.close();
-  }
-}
-
-class PingPongApplication extends Application {
-  PingPongApplication.fromHandle(MojoHandle handle) : super.fromHandle(handle);
-
-  @override
-  void acceptConnection(String requestorUrl, String resolvedUrl,
-      ApplicationConnection connection) {
-    connection.provideService(PingPongService.serviceName,
-        (endpoint) => new PingPongServiceImpl(this, endpoint));
-    // Close the application when the first connection goes down.
-    connection.onError = ((_) => closeApplication());
-  }
-
-  Future closeApplication() async {
-    await close();
-    MojoHandle.reportLeakedHandles();
-  }
-}
-
-main(List args) {
-  MojoHandle appHandle = new MojoHandle(args[0]);
-  String url = args[1];
-  new PingPongApplication.fromHandle(appHandle);
-}