Add action for each button on opt-in IME menu.

ash/common/shelf/shelf_layout_manager.h

 // Copyright 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_COMMON_SHELF_SHELF_LAYOUT_MANAGER_H_
 #define ASH_COMMON_SHELF_SHELF_LAYOUT_MANAGER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 125 matching lines @@
   void OnLockStateChanged(bool locked) override;
   void OnShelfAutoHideBehaviorChanged(WmWindow* root_window) override;
   void OnPinnedStateChanged(WmWindow* pinned_window) override;
 
   // Overridden from WmActivationObserver:
   void OnWindowActivated(WmWindow* gained_active,
                          WmWindow* lost_active) override;
 
   // Overridden from keyboard::KeyboardControllerObserver:
   void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) override;
+  void OnKeyboardHidden() override;
 
   // Overridden from LockStateObserver:
   void OnLockStateEvent(LockStateObserver::EventType event) override;
 
   // Overridden from SessionStateObserver:
   void SessionStateChanged(SessionStateDelegate::SessionState state) override;
 
   // TODO(msw): Remove these accessors, kept temporarily to simplify changes.
   ShelfAlignment GetAlignment() const { return shelf_widget_->GetAlignment(); }
 
@@ skipping 214 matching lines @@
   // The flag to enforce invisible shelf (as in MD-experiemntal).
   // TODO(oshima): Remove this when MD immersive is launched.
   bool invisible_auto_hide_shelf_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELF_SHELF_LAYOUT_MANAGER_H_