Add the beginning of a simple window manager that we'll support on Windows.

mash/simple_wm/main.cc

Index: mash/simple_wm/main.cc
diff --git a/mash/simple_wm/main.cc b/mash/simple_wm/main.cc
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index 0000000000000000000000000000000000000000..423113063476037ca00e57d1f3cd579e7e99ce99
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+++ b/mash/simple_wm/main.cc
@@ -0,0 +1,12 @@
+// 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 "mash/simple_wm/simple_wm.h"
+#include "services/service_manager/public/c/main.h"
+#include "services/service_manager/public/cpp/service_runner.h"
+
+MojoResult ServiceMain(MojoHandle service_request_handle) {
+  service_manager::ServiceRunner runner(new simple_wm::SimpleWM);
+  return runner.Run(service_request_handle);
+}