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

chrome/browser/chromeos/login/ui/login_display_host_impl.cc

 // Copyright 2014 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 "chrome/browser/chromeos/login/ui/login_display_host_impl.h"
 
 #include <utility>
 #include <vector>
 
 #include "ash/common/shell_window_ids.h"
@@ skipping 927 matching lines @@
     // Keyboard has been hidden.
     if (GetOobeUI())
       GetOobeUI()->GetCoreOobeActor()->ShowControlBar(true);
   } else if (!new_bounds.IsEmpty()) {
     // Keyboard has been shown.
     if (GetOobeUI())
       GetOobeUI()->GetCoreOobeActor()->ShowControlBar(false);
   }
 }
 
+void LoginDisplayHostImpl::OnKeyboardHidden() {}
+
 ////////////////////////////////////////////////////////////////////////////////
 // LoginDisplayHostImpl, display::DisplayObserver:
 
 void LoginDisplayHostImpl::OnDisplayAdded(const display::Display& new_display) {
 }
 
 void LoginDisplayHostImpl::OnDisplayRemoved(
     const display::Display& old_display) {}
 
 void LoginDisplayHostImpl::OnDisplayMetricsChanged(
@@ skipping 406 matching lines @@
 
   locale_util::SwitchLanguageCallback callback(
       base::Bind(&OnLanguageSwitchedCallback, base::Passed(std::move(data))));
 
   // Load locale keyboards here. Hardware layout would be automatically enabled.
   locale_util::SwitchLanguage(locale, true, true /* login_layouts_only */,
                               callback, ProfileManager::GetActiveUserProfile());
 }
 
 }  // namespace chromeos