ash: Start/stop observing KeyboardController via ShellObserver

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/system/tray/system_tray.h"
@@ skipping 1010 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // LoginDisplayHostImpl, chromeos::CrasAudioHandler::AudioObserver:
 
 void LoginDisplayHostImpl::OnActiveOutputNodeChanged() {
   TryToPlayStartupSound();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // LoginDisplayHostImpl, ash::ShellObserver:
 
-void LoginDisplayHostImpl::OnVirtualKeyboardStateChanged(bool activated) {
+void LoginDisplayHostImpl::OnVirtualKeyboardStateChanged(
+    bool activated,
+    ash::WmWindow* root_window) {
   if (keyboard::KeyboardController::GetInstance()) {
     if (activated) {
       if (!is_observing_keyboard_) {
         keyboard::KeyboardController::GetInstance()->AddObserver(this);
         is_observing_keyboard_ = true;
       }
     } else {
       keyboard::KeyboardController::GetInstance()->RemoveObserver(this);
       is_observing_keyboard_ = false;
     }
@@ skipping 446 matching lines @@
   // Chrome locale. Otherwise it will be lost if Chrome restarts.
   // Don't need to schedule pref save because setting initial local
   // will enforce preference saving.
   prefs->SetString(prefs::kApplicationLocale, locale);
   StartupUtils::SetInitialLocale(locale);
 
   TriggerShowLoginWizardFinish(locale, std::move(data));
 }
 
 }  // namespace chromeos