Add old_state parameter to CustomButton::StateChanged

ui/app_list/views/app_list_item_view.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_APP_LIST_VIEWS_APP_LIST_ITEM_VIEW_H_
 #define UI_APP_LIST_VIEWS_APP_LIST_ITEM_VIEW_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 107 matching lines @@
   const char* GetClassName() const override;
   void Layout() override;
   void OnPaint(gfx::Canvas* canvas) override;
 
   // views::ContextMenuController overrides:
   void ShowContextMenuForView(views::View* source,
                               const gfx::Point& point,
                               ui::MenuSourceType source_type) override;
 
   // views::CustomButton overrides:
-  void StateChanged() override;
+  void StateChanged(ButtonState old_state) override;
   bool ShouldEnterPushedState(const ui::Event& event) override;
 
   // views::View overrides:
   bool OnKeyPressed(const ui::KeyEvent& event) override;
   bool OnMousePressed(const ui::MouseEvent& event) override;
   void OnMouseReleased(const ui::MouseEvent& event) override;
   bool OnMouseDragged(const ui::MouseEvent& event) override;
 
   // AppListItemObserver overrides:
   void ItemIconChanged() override;
@@ skipping 28 matching lines @@
 
   // A timer to defer showing drag UI when mouse is pressed.
   base::OneShotTimer mouse_drag_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListItemView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_APP_LIST_ITEM_VIEW_H_