Reorder browser list on workspace switch

ui/views/widget/desktop_aura/x11_desktop_handler.h

 // Copyright (c) 2012 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_X11_DESKTOP_HANDLER_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_
 
 #include <stdint.h>
 #include <X11/Xlib.h>
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
 #undef RootWindow
 
 #include <vector>
 
 #include "base/macros.h"
+#include "base/observer_list.h"
 #include "ui/aura/env_observer.h"
 #include "ui/events/platform/platform_event_dispatcher.h"
 #include "ui/events/platform/x11/x11_event_source.h"
 #include "ui/gfx/x/x11_atom_cache.h"
 #include "ui/gfx/x/x11_types.h"
 #include "ui/views/views_export.h"
+#include "ui/views/widget/desktop_aura/x11_desktop_handler_observer.h"
 
 namespace base {
 template <typename T> struct DefaultSingletonTraits;
 }
 
 namespace views {
 
 // A singleton that owns global objects related to the desktop and listens for
 // X11 events on the X11 root window. Destroys itself when aura::Env is
 // deleted.
 class VIEWS_EXPORT X11DesktopHandler : public ui::PlatformEventDispatcher,
                                        public aura::EnvObserver {
  public:
   // Returns the singleton handler.
   static X11DesktopHandler* get();
 
+  // Adds/removes X11DesktopHandlerObservers.
+  void AddObserver(X11DesktopHandlerObserver* observer);
+  void RemoveObserver(X11DesktopHandlerObserver* observer);
+
   // Gets/sets the X11 server time of the most recent mouse click, touch or
   // key press on a Chrome window.
   int wm_user_time_ms() const { return wm_user_time_ms_; }
   void set_wm_user_time_ms(Time time_ms);
 
   // Sends a request to the window manager to activate |window|.
   // This method should only be called if the window is already mapped.
   void ActivateWindow(::Window window);
 
   // Attempts to get the window manager to deactivate |window| by moving it to
@@ skipping 50 matching lines @@
   ::Window current_window_;
 
   // Whether we should treat |current_window_| as active. In particular, we
   // pretend that a window is deactivated after a call to DeactivateWindow().
   ActiveState current_window_active_state_;
 
   ui::X11AtomCache atom_cache_;
 
   bool wm_supports_active_window_;
 
+  base::ObserverList<X11DesktopHandlerObserver> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(X11DesktopHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_