Merge the Sky Engine changes from the SkyDart branch

sky/examples/dart-mojo.sky

-// 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.
-
-// Run with, e.g.:
-// mojo_shell "mojo:dart_wget http://www.google.com"
-
+#!mojo mojo:sky_viewer
+<sky>
+<import src="dart-library.sky" as="library" />
+<script>
 import 'dart:async';
-import 'dart:mojo_application';
+import '/mojo/public/dart/application.dart';
 import 'dart:mojo_bindings';
 import 'dart:mojo_core';
 import 'dart:typed_data';
+import 'dart:sky.internals' as internals;
 
 import 'package:mojo/services/network/public/interfaces/network_service.mojom.dart';
 import 'package:mojo/services/network/public/interfaces/url_loader.mojom.dart';
+import 'package:mojo/public/interfaces/application/shell.mojom.dart' as shell_mojom;
 
 class WGet extends Application {
   NetworkServiceProxy _networkService;
   UrlLoaderProxy _urlLoaderProxy;
 
   WGet.fromHandle(MojoHandle handle) : super.fromHandle(handle);
+  WGet(MojoMessagePipeEndpoint endpoint) : super(endpoint);
 
-  void initialize(List<String> args, String url) {
+  void initialize(List<String> args) {
     run(args);
   }
 
   run(List<String> args) async {
     if (args == null || args.length != 2) {
       throw "Expected URL argument";
     }
 
     ByteData bodyData = await _getUrl(args[1]);
     print("read ${bodyData.lengthInBytes} bytes");
@@ skipping 29 matching lines @@
   }
 
   void _closeProxies() {
     _urlLoaderProxy.close();
     _networkService.close();
     _urlLoaderProxy = null;
     _networkService = null;
   }
 }
 
-main(List args) {
-  MojoHandle appHandle = new MojoHandle(args[0]);
-  var wget = new WGet.fromHandle(appHandle);
+main() {
+  var messagePipe = new MojoMessagePipe();
+  var wget = new WGet(messagePipe.endpoints[1]);
   wget.listen();
+  var shellProxy = new shell_mojom.ShellProxy.fromHandle(new MojoHandle(internals.passShellProxyHandle()));
+  wget.initializeFromShellProxy(shellProxy, ["mojo:wget", "http://www.google.com"]);
 }
+
+</script>
+</sky>