Converts ash to use aura-mus

ash/mus/window_properties.h

Index: ash/mus/window_properties.h
diff --git a/ash/mus/window_properties.h b/ash/mus/window_properties.h
new file mode 100644
index 0000000000000000000000000000000000000000..58396c919f7926ab7b4c743de6938318133b0e72
--- /dev/null
+++ b/ash/mus/window_properties.h
@@ -0,0 +1,21 @@
+// 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.
+
+#ifndef ASH_MUS_WINDOW_PROPERTIES_H_
+#define ASH_MUS_WINDOW_PROPERTIES_H_
+
+#include "ui/aura/window.h"
+
+namespace ash {
+namespace mus {
+
+// Maps to ui::mojom::WindowManager::kRendererParentTitleArea_Property.
+extern const aura::WindowProperty<bool>* const kRenderTitleAreaProperty;
+
+extern const aura::WindowProperty<bool>* const kWindowIsJanky;
+
+}  // namespace mus
+}  // namespace ash
+
+#endif  // ASH_MUS_WINDOW_PROPERTIES_H_