linux_aura: Implement the static part of the dbus menu for Unity.

ui/views/widget/desktop_aura/desktop_root_window_host_observer_x11.h

+// Copyright 2013 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 UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_OBSERVER_X11_H_
+#define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_OBSERVER_X11_H_
+
+#include "ui/views/views_export.h"
+
+namespace views {
+
+// Allows for the observation of lower level window events.
+class VIEWS_EXPORT DesktopRootWindowHostObserverX11 {
+ public:
+  virtual ~DesktopRootWindowHostObserverX11() {}
+
+  // Called after we receive a MapNotify event (the X11 server has allocated
+  // resources for it).
+  virtual void OnWindowMapped(unsigned long xid) = 0;
+
+  // Called after we receive an UnmapNotify event (the X11 server has freed
+  // resources for it).
+  virtual void OnWindowUnmapped(unsigned long xid) = 0;
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_OBSERVER_X11_H_
+