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

Index: ui/aura/client/activation_change_observer.h
diff --git a/ui/aura/client/activation_change_observer.h b/ui/aura/client/activation_change_observer.h
index 38fa39ce575f48fd98e73a73bac0564dcc34a247..2f247db04b34de831daf4ebfcccf001eda347495 100644
--- a/ui/aura/client/activation_change_observer.h
+++ b/ui/aura/client/activation_change_observer.h
@@ -21,6 +21,12 @@ class AURA_EXPORT ActivationChangeObserver {
   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() {}
 };