Add old_state parameter to CustomButton::StateChanged

ui/views/controls/button/menu_button.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_BUTTON_MENU_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 78 matching lines @@
  protected:
   // Paint the menu marker image.
   void PaintMenuMarker(gfx::Canvas* canvas);
 
   // Overridden from LabelButton:
   gfx::Rect GetChildAreaBounds() override;
 
   // Overridden from CustomButton:
   bool IsTriggerableEvent(const ui::Event& event) override;
   bool ShouldEnterPushedState(const ui::Event& event) override;
-  void StateChanged() override;
+  void StateChanged(ButtonState old_state) override;
   void NotifyClick(const ui::Event& event) override;
 
   // Offset of the associated menu position.
   gfx::Point menu_offset_;
 
  private:
   friend class PressedLock;
 
   // Increment/decrement the number of "pressed" locks this button has, and
   // set the state accordingly. The ink drop is snapped to the final ACTIVATED
@@ skipping 39 matching lines @@
   bool should_disable_after_press_;
 
   base::WeakPtrFactory<MenuButton> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_