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

ash/common/wm/panels/panel_layout_manager.cc

 // 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.
 
 #include "ash/common/wm/panels/panel_layout_manager.h"
 
 #include <algorithm>
 #include <map>
 #include <utility>
 
@@ skipping 888 matching lines @@
     } else if (panel_state->HasRestoreBounds()) {
       // Keyboard hidden, restore original bounds if they exist.
       panel->SetBoundsDirect(panel_state->GetRestoreBoundsInScreen());
     }
   }
   // This bounds change will have caused a change to the Shelf which does not
   // propogate automatically to this class, so manually recalculate bounds.
   OnWindowResized();
 }
 
+void PanelLayoutManager::OnKeyboardHidden() {}
+
 }  // namespace ash