ash/mash: Add a mus-client that sets up ash to provide the system ui for mash.

ash/mus/main.cc

Index: ash/mus/main.cc
diff --git a/mash/screenlock/main.cc b/ash/mus/main.cc
similarity index 76%
copy from mash/screenlock/main.cc
copy to ash/mus/main.cc
index 23b307da6f9d11d2617b46ae422f17cab72d1bc0..abc410921761ca1f5bbd98366fd117f6fe71036d 100644
--- a/mash/screenlock/main.cc
+++ b/ash/mus/main.cc
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "mash/screenlock/screenlock.h"
+#include "ash/mus/sysui_application.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/shell/public/cpp/application_runner.h"
 
 MojoResult MojoMain(MojoHandle shell_handle) {
-  mojo::ApplicationRunner runner(new mash::screenlock::Screenlock);
+  mojo::ApplicationRunner runner(new ash::sysui::SysUIApplication);
   return runner.Run(shell_handle);
 }