ash: Start/stop observing KeyboardController via ShellObserver

chrome/browser/chromeos/login/lock/webui_screen_locker.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/lock/webui_screen_locker.h"
 
 #include "ash/common/wm_shell.h"
 #include "ash/shell.h"
 #include "ash/system/chromeos/power/power_event_observer.h"
 #include "base/command_line.h"
@@ skipping 398 matching lines @@
   if (browser_shutdown::GetShutdownType() == browser_shutdown::NOT_VALID &&
       status != base::TERMINATION_STATUS_NORMAL_TERMINATION) {
     LOG(ERROR) << "Renderer crash on lock screen; signing out";
     Signout();
   }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // ash::ShellObserver:
 
-void WebUIScreenLocker::OnVirtualKeyboardStateChanged(bool activated) {
+void WebUIScreenLocker::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 39 matching lines @@
   }
 
   if (GetOobeUI()) {
     const gfx::Size& size = primary_display.size();
     GetOobeUI()->GetCoreOobeView()->SetClientAreaSize(size.width(),
                                                       size.height());
   }
 }
 
 }  // namespace chromeos