Disable rendering when suspending on chrome os

chrome/browser/chromeos/login/lock/webui_screen_locker.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WEBUI_SCREEN_LOCKER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WEBUI_SCREEN_LOCKER_H_
 
 #include <string>
 
 #include "ash/shell_delegate.h"
@@ skipping 53 matching lines @@
   void OnAuthenticate() override;
   void SetInputEnabled(bool enabled) override;
   void ShowErrorMessage(int error_msg_id,
                         HelpAppLauncher::HelpTopic help_topic_id) override;
   void ClearErrors() override;
   void AnimateAuthenticationSuccess() override;
   gfx::NativeWindow GetNativeWindow() const override;
   content::WebUI* GetAssociatedWebUI() override;
   void OnLockWebUIReady() override;
   void OnLockBackgroundDisplayed() override;
+  void OnHeaderBarVisible() override;
 
   // LoginDisplay::Delegate:
   void CancelPasswordChangedFlow() override;
   void CreateAccount() override;
   void CompleteLogin(const UserContext& user_context) override;
   base::string16 GetConnectedNetworkName() override;
   bool IsSigninInProgress() const override;
   void Login(const UserContext& user_context,
              const SigninSpecifics& specifics) override;
   void MigrateUserData(const std::string& old_password) override;
@@ skipping 78 matching lines @@
   gfx::Rect keyboard_bounds_;
 
   base::WeakPtrFactory<WebUIScreenLocker> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUIScreenLocker);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WEBUI_SCREEN_LOCKER_H_