Add virtualKeyboardPrivate.onKeyboardClosed API.

ash/common/wm/dock/docked_window_layout_manager.h

 // Copyright (c) 2013 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_WM_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_H_
 #define ASH_COMMON_WM_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 231 matching lines @@
   // area change. Passing |reason| to observers allows selectively skipping
   // notifications.
   void UpdateDockBounds(DockedWindowLayoutManagerObserver::Reason reason);
 
   // Called whenever the window stacking order needs to be updated (e.g. focus
   // changes or a window is moved).
   void UpdateStacking(WmWindow* active_window);
 
   // keyboard::KeyboardControllerObserver:
   void OnKeyboardBoundsChanging(const gfx::Rect& keyboard_bounds) override;
+  void OnKeyboardClosed() override {}
 
   // Parent window associated with this layout manager.
   WmWindow* dock_container_;
 
   WmRootWindowController* root_window_controller_;
 
   // Protect against recursive calls to Relayout().
   bool in_layout_;
 
   // A window that is being dragged (whether docked or not).
@@ skipping 52 matching lines @@
 
   // Observers of dock bounds changes.
   base::ObserverList<DockedWindowLayoutManagerObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(DockedWindowLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_H_