Added Sky Mojo embedder singleton, restored network test

sky/framework/embedder.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 "/mojo/public/dart/application.dart";
+import "dart:mojo_bindings" as bindings;
+import "dart:mojo_core" as core;
+import "dart:sky.internals" as internals;
+import "package:mojo/public/interfaces/application/service_provider.mojom.dart";
+import "package:mojo/public/interfaces/application/shell.mojom.dart";
+
+final embedder = new EmbedderImpl();

[abarth-chromium, 2015/02/20 22:51:38]

Type pls

[hansmuller1, 2015/02/20 22:58:54]

Done.

+
+class EmbedderImpl {

[abarth-chromium, 2015/02/20 22:51:38]

EmbedderImpl -> _EmbedderImpl to hide the class.

[hansmuller1, 2015/02/20 22:58:54]

Done.

+  final connections = new List<ApplicationConnection>();

[abarth-chromium, 2015/02/20 22:51:38]

Type pls

[hansmuller1, 2015/02/20 22:58:54]

I removed the field; it shouldn't have been there.

+  var _shell;

[abarth-chromium, 2015/02/20 22:51:38]

Type pls

[hansmuller1, 2015/02/20 22:58:54]

Done.

+
+  ShellProxy shell() {

[abarth-chromium, 2015/02/20 22:51:38]

This should be a getter.

Actually, if you make _shell final, you can get rid of this getter and rename
_shell to shell.

[hansmuller1, 2015/02/20 22:58:54]

Done.

+    if (_shell == null)
+      _shell = new ShellProxy.fromHandle(
+          new core.MojoHandle(internals.takeShellProxyHandle()));

[abarth-chromium, 2015/02/20 22:51:38]

You can do this as an initializer for _shell if you make _shell as final.

[hansmuller1, 2015/02/20 22:58:54]

Done.

+    return _shell;
+  }
+
+  ApplicationConnection connectToApplication(String url) {
+    var proxy = new ServiceProviderProxy.unbound();
+    var stub = new ServiceProviderStub.unbound();
+    shell().connectToApplication(url, proxy, stub);
+    return new ApplicationConnection(stub, proxy);
+  }
+
+  void connectToService(String url, bindings.Proxy proxy) {
+    var appSp = new ServiceProviderProxy.unbound();
+    shell().connectToApplication(url, appSp, null);
+    var pipe = new core.MojoMessagePipe();
+    proxy.bind(pipe.endpoints[0]);
+    appSp.connectToService(proxy.name, pipe.endpoints[1]);
+    appSp.close();
+  }
+}