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

ash/common/wm/system_modal_container_layout_manager.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_COMMON_WM_SYSTEM_MODAL_CONTAINER_LAYOUT_MANAGER_H_
 #define ASH_COMMON_WM_SYSTEM_MODAL_CONTAINER_LAYOUT_MANAGER_H_
 
 #include <memory>
 #include <set>
 #include <vector>
@@ skipping 31 matching lines @@
   void SetChildBounds(WmWindow* child,
                       const gfx::Rect& requested_bounds) override;
 
   // Overridden from WmWindowObserver:
   void OnWindowPropertyChanged(WmWindow* window,
                                WmWindowProperty property) override;
   void OnWindowVisibilityChanged(WmWindow* window, bool visible) override;
 
   // Overridden from keyboard::KeyboardControllerObserver:
   void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) override;
+  void OnKeyboardHidden() override;
 
   // True if the window is either contained by the top most modal window,
   // or contained by its transient children.
   bool IsPartOfActiveModalWindow(WmWindow* window);
 
   // Activates next modal window if any. Returns false if there
   // are no more modal windows in this layout manager.
   bool ActivateNextModalWindow();
 
   // Creates modal background window, which is a partially-opaque
@@ skipping 43 matching lines @@
   // Windows contained in this set are centered. Windows are automatically
   // added to this based on IsBoundsCentered().
   std::set<const WmWindow*> windows_to_center_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemModalContainerLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_SYSTEM_MODAL_CONTAINER_LAYOUT_MANAGER_H_