Fixes alternating keyboard and mouse hot-tracking in menus

ui/views/controls/menu/menu_controller.h

Index: ui/views/controls/menu/menu_controller.h
diff --git a/ui/views/controls/menu/menu_controller.h b/ui/views/controls/menu/menu_controller.h
index 839b19fa6d64fe84c5fa528e9b0303eae4ed4b21..f4a80d25af354bef84c5a1b219a091fb94f74f03 100644
--- a/ui/views/controls/menu/menu_controller.h
+++ b/ui/views/controls/menu/menu_controller.h
@@ -561,6 +561,9 @@ class VIEWS_EXPORT MenuController : public WidgetObserver {
   void SetInitialHotTrackedView(MenuItemView* item,
                                 SelectionIncrementDirectionType direction);
 
+  // Updates the current |hot_button_| and its hot tracked state.
+  void SetHotTrackedButton(CustomButton* hot_button);
+
   // The active instance.
   static MenuController* active_instance_;
 
@@ -659,6 +662,9 @@ class VIEWS_EXPORT MenuController : public WidgetObserver {
   // See UpdateActiveMouseView() for details.
   const int active_mouse_view_id_;
 
+  // Current hot tracked child button if any.
+  CustomButton* hot_button_;
+
   internal::MenuControllerDelegate* delegate_;
 
   // How deep we are in nested message loops. This should be at most 2 (when