Trying to activate a window in a workspace other than the current is ignored while a system modal d…

ui/aura/client/activation_change_observer.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_AURA_CLIENT_ACTIVATION_CHANGE_OBSERVER_H_
 #define UI_AURA_CLIENT_ACTIVATION_CHANGE_OBSERVER_H_
 
 #include "ui/aura/aura_export.h"
 
 namespace aura {
 class Window;
 
 namespace client {
 
 class AURA_EXPORT ActivationChangeObserver {
  public:
   // Called when |active| gains focus, or there is no active window
   // (|active| is NULL in this case.) |old_active| refers to the
   // previous active window or NULL if there was no previously active
   // window.
   virtual void OnWindowActivated(Window* gained_active,
                                  Window* lost_active) = 0;
 
+  // Called when during window activation the currently active window is
+  // selected for activation. This can happen when a window requested for
+  // activation cannot be activated because a system modal window is active.
+  virtual void OnAttemptToReactivateWindow(aura::Window* request_active,
+                                           aura::Window* actual_active) {}
+
  protected:
   virtual ~ActivationChangeObserver() {}
 };
 
 // Gets/Sets the ActivationChangeObserver for a specific window. This observer
 // is notified after the ActivationClient notifies all registered observers.
 AURA_EXPORT void SetActivationChangeObserver(
     Window* window,
     ActivationChangeObserver* observer);
 AURA_EXPORT ActivationChangeObserver* GetActivationChangeObserver(
     Window* window);
 
 }  // namespace client
 }  // namespace aura
 
 #endif  // UI_AURA_CLIENT_ACTIVATION_CHANGE_OBSERVER_H_