Implement sync of keyboard layout between Ozone and Wayland clients

ash/system/tray_caps_lock.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 ASH_SYSTEM_TRAY_CAPS_LOCK_H_
 #define ASH_SYSTEM_TRAY_CAPS_LOCK_H_
 
 #include "ash/system/tray/tray_image_item.h"
 #include "base/macros.h"
 #include "ui/base/ime/chromeos/ime_keyboard.h"
 #include "ui/events/event_handler.h"
 
 namespace views {
 class View;
 }
 
 namespace ash {
 class CapsLockDefaultView;
 
 class TrayCapsLock : public TrayImageItem,
                      public chromeos::input_method::ImeKeyboard::Observer {
  public:
   explicit TrayCapsLock(SystemTray* system_tray);
   ~TrayCapsLock() override;
 
  private:
-  // Overriden from chromeos::input_method::ImeKeyboard::Observer:
+  // Overridden from chromeos::input_method::ImeKeyboard::Observer:
   void OnCapsLockChanged(bool enabled) override;
+  void OnLayoutChanging(const std::string& layout_name) override {}
 
   // Overridden from TrayImageItem.
   bool GetInitialVisibility() override;
   views::View* CreateDefaultView(LoginStatus status) override;
   void OnDefaultViewDestroyed() override;
 
   CapsLockDefaultView* default_;
 
   bool caps_lock_enabled_;
   bool message_shown_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayCapsLock);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_CAPS_LOCK_H_