Mus Demo: Demonstrate external window mode

services/ui/demo/main_external.cc

Index: services/ui/demo/main_external.cc
diff --git a/services/ui/demo/main_external.cc b/services/ui/demo/main_external.cc
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+++ b/services/ui/demo/main_external.cc
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+// Copyright 2016 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.
+
+#include "services/service_manager/public/c/main.h"
+#include "services/service_manager/public/cpp/service_runner.h"
+#include "services/ui/demo/mus_demo_external.h"
+
+MojoResult ServiceMain(MojoHandle service_request_handle) {
+  service_manager::ServiceRunner runner(new ui::demo::MusDemoExternal);
+  return runner.Run(service_request_handle);
+}