Add virtualKeyboardPrivate.onKeyboardClosed API.

ash/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_SHELF_SHELF_LAYOUT_MANAGER_H_
 #define ASH_SHELF_SHELF_LAYOUT_MANAGER_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 146 matching lines @@
   void OnPinnedStateChanged(WmWindow* pinned_window) override;
 
   // Overriden from aura::client::ActivationChangeObserver:
   void OnWindowActivated(
       aura::client::ActivationChangeObserver::ActivationReason reason,
       aura::Window* gained_active,
       aura::Window* lost_active) override;
 
   // Overridden from keyboard::KeyboardControllerObserver:
   void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) override;
+  void OnKeyboardClosed() override {}
 
   // Overridden from ash::LockStateObserver:
   void OnLockStateEvent(LockStateObserver::EventType event) override;
 
   // Overridden from ash::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 217 matching lines @@
 
   std::unique_ptr<RootWindowControllerObserverImpl>
       root_window_controller_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_LAYOUT_MANAGER_H_