Rationalize Dart mojo and sky package structure

mojo/dart/apptest/apptest/apptest.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 apptest;
-
-import 'dart:async';
-
-import 'package:mojo/public/dart/application.dart';
-import 'package:mojo/public/dart/bindings.dart';
-import 'package:mojo/public/dart/core.dart';
-
-// Import and reexport the unittest package. We are a *.dartzip file designed to
-// be linked into your_apptest.mojo file and are your main entrypoint.
-import 'package:unittest/unittest.dart';
-export 'package:unittest/unittest.dart';
-
-// This class is an application that does nothing but tears down the connections
-// between each test.
-class _ConnectionToShellApplication extends Application {
-  final List<Function> _testFunctions;
-
-  _ConnectionToShellApplication.fromHandle(
-      MojoHandle handle, this._testFunctions)
-      : super.fromHandle(handle);
-
-  // Only run the test suite passed in once we have received an initialize()
-  // call from the shell. We need to first have a valid connection to the shell
-  // so that apptests can connect to other applications.
-  void initialize(List<String> args, String url) {
-    _testFunctions.forEach((f) => f(this, url));
-  }
-}
-
-// A configuration which properly shuts down our application at the end.
-class _CleanShutdownConfiguration extends SimpleConfiguration {
-  final _ConnectionToShellApplication _application;
-
-  _CleanShutdownConfiguration(this._application) : super() {}
-
-  Duration timeout = const Duration(seconds: 10);
-
-  void onTestResult(TestCase externalTestCase) {
-    super.onTestResult(externalTestCase);
-    _application.resetConnections();
-  }
-
-  void onDone(bool success) {
-    closeApplication();
-    super.onDone(success);
-  }
-
-  Future closeApplication() async {
-    await _application.close();
-    assert(MojoHandle.reportLeakedHandles());
-  }
-}
-
-// The public interface to apptests.
-//
-// In a dart mojo application, |incoming_handle| is args[0]. |testFunction| is a
-// list of functions that actually contains your testing code, and will pass
-// back an application to each of them.
-runAppTests(var incomingHandle, List<Function> testFunction) {
-  var appHandle = new MojoHandle(incomingHandle);
-  var application =
-      new _ConnectionToShellApplication.fromHandle(appHandle, testFunction);
-  unittestConfiguration = new _CleanShutdownConfiguration(application);
-}