Dart: Reorganize files

services/dart/test/echo/lib/main.dart

-// Copyright 2014 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/echo_service.mojom.dart';
-
-class EchoServiceImpl implements EchoService {
-  EchoServiceStub _stub;
-  Application _application;
-
-  EchoServiceImpl(this._application, MojoMessagePipeEndpoint endpoint) {
-    _stub = new EchoServiceStub.fromEndpoint(endpoint, this);
-  }
-
-  dynamic echoString(String value, [Function responseFactory]) {
-    if (value == "quit") {
-      _stub.close();
-    }
-    return responseFactory(value);
-  }
-
-  dynamic delayedEchoString(String value, int millis,
-      [Function responseFactory]) {
-    if (value == "quit") {
-      _stub.close();
-    }
-    return new Future.delayed(
-        new Duration(milliseconds: millis), () => responseFactory(value));
-  }
-}
-
-class EchoApplication extends Application {
-  EchoApplication.fromHandle(MojoHandle handle) : super.fromHandle(handle);
-
-  @override
-  void acceptConnection(String requestorUrl, String resolvedUrl,
-      ApplicationConnection connection) {
-    connection.provideService(
-        EchoService.serviceName, (endpoint) => new EchoServiceImpl(this, endpoint));
-  }
-}
-
-main(List args) {
-  MojoHandle appHandle = new MojoHandle(args[0]);
-  String url = args[1];
-  new EchoApplication.fromHandle(appHandle)
-    ..onError = ((_) {
-      MojoHandle.reportLeakedHandles();
-    });
-}