Refactor AddScrollListItem() in system menu detailed views

ash/system/ime_menu/ime_list_view.h

 // Copyright 2016 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 ASH_SYSTEM_IME_MENU_IME_LIST_VIEW_H_
 #define ASH_SYSTEM_IME_MENU_IME_LIST_VIEW_H_
 
 #include "ash/ash_export.h"
 #include "ash/system/tray/ime_info.h"
 #include "ash/system/tray/tray_details_view.h"
@@ skipping 26 matching lines @@
                       const IMEPropertyInfoList& property_list,
                       bool show_keyboard_toggle,
                       SingleImeBehavior single_ime_behavior);
 
   // Removes (and destroys) all child views.
   virtual void ResetImeListView();
 
   // Closes the view.
   void CloseImeListView();
 
+  // Scrolls contents such that |item_view| is visible.
+  void ScrollItemToVisible(views::View* item_view);
+
   void set_last_item_selected_with_keyboard(
       bool last_item_selected_with_keyboard) {
     last_item_selected_with_keyboard_ = last_item_selected_with_keyboard;
   }
 
   void set_should_focus_ime_after_selection_with_keyboard(
       const bool focus_current_ime) {
     should_focus_ime_after_selection_with_keyboard_ = focus_current_ime;
   }
 
@@ skipping 57 matching lines @@
 
  private:
   ImeListView* ime_list_view_;
 
   DISALLOW_COPY_AND_ASSIGN(ImeListViewTestApi);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_IME_MENU_IME_LIST_VIEW_H_