Enables hot-tracking for overflow extension buttons in the app menu

ui/views/controls/menu/menu_controller.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_CONTROLS_MENU_MENU_CONTROLLER_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_
 
 #include "build/build_config.h"
 
 #include <stddef.h>
@@ skipping 480 matching lines @@
       bool (*match_function)(MenuItemView* menu, base::char16 mnemonic));
 
   // Selects or accepts the appropriate menu item based on |details|.
   void AcceptOrSelect(MenuItemView* parent, const SelectByCharDetails& details);
 
   // Selects by mnemonic, and if that doesn't work tries the first character of
   // the title.
   void SelectByChar(base::char16 key);
 
   // For Windows and Aura we repost an event which dismisses the |source| menu.
   // The menu is also canceled dependent on the target of the event. The event

[Peter Kasting, 2016/02/24 02:04:49]

Nit: is also canceled dependent -> may also be canceled depending ?

[varkha, 2016/02/24 05:52:10]

Done.

   // is then reprocessed to cause its result if the menu had not been present.

[Peter Kasting, 2016/02/24 02:04:49]

Nit: The event is then reprocessed to cause its result if the menu had not been
present. -> |event| is then processed without the menu present. ?

[varkha, 2016/02/24 05:52:10]

Done.

   // On non-aura Windows, a new mouse event is generated and posted to
   // the window (if there is one) at the location of the event. On
   // aura, the event is reposted on the RootWindow.
   void RepostEventAndCancel(SubmenuView* source, const ui::LocatedEvent* event);
 
   // Sets the drop target to new_item.
   void SetDropMenuItem(MenuItemView* new_item,
                        MenuDelegate::DropPosition position);
 
   // Starts/stops scrolling as appropriate. part gives the part the mouse is
@@ skipping 37 matching lines @@
   void ExitAsyncRun();
 
   // Performs the teardown of the menu launched by Run(). The selected item is
   // returned.
   MenuItemView* ExitMenuRun();
 
   // Handles the mouse location event on the submenu |source|.
   void HandleMouseLocation(SubmenuView* source,
                            const gfx::Point& mouse_location);
 
+  // Updates the current |hot_button_| and its hot tracked state.
+  void SetHotTrackedButton(CustomButton* hot_button);
+
+  // Sets hot-tracked state to the first focusable descendant view of |item|.
+  void SetInitialHotTrackedView(MenuItemView* item,
+                                SelectionIncrementDirectionType direction);
+
   // The active instance.
   static MenuController* active_instance_;
 
   // If true, Run blocks. If false, Run doesn't block and this is used for
   // drag and drop. Note that the semantics for drag and drop are slightly
   // different: cancel timer is kicked off any time the drag moves outside the
   // menu, mouse events do nothing...
   bool blocking_run_;
 
   // If true, we're showing.
@@ skipping 78 matching lines @@
   // underway.
   scoped_ptr<MenuScrollTask> scroll_task_;
 
   // The lock to keep the menu button pressed while a menu is visible.
   scoped_ptr<MenuButton::PressedLock> pressed_lock_;
 
   // ViewStorage id used to store the view mouse drag events are forwarded to.
   // See UpdateActiveMouseView() for details.
   const int active_mouse_view_id_;
 
+  // Current hot tracked view if any.
+  CustomButton* hot_button_;
+
   internal::MenuControllerDelegate* delegate_;
 
   // How deep we are in nested message loops. This should be at most 2 (when
   // showing a context menu from a menu).
   int message_loop_depth_;
 
   // The timestamp of the event which closed the menu - or 0 otherwise.
   base::TimeDelta closing_event_time_;
 
   // Time when the menu is first shown.
@@ skipping 28 matching lines @@
 #if defined(USE_AURA)
   scoped_ptr<MenuKeyEventHandler> key_event_handler_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(MenuController);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_