Disable rendering when suspending on chrome os

chrome/browser/chromeos/login/lock/screen_locker_delegate.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_SCREEN_LOCKER_DELEGATE_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_SCREEN_LOCKER_DELEGATE_H_
 
 #include "base/callback_forward.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
@@ skipping 54 matching lines @@
   // Returns WebUI associated with screen locker implementation or NULL if
   // there isn't one.
   virtual content::WebUI* GetAssociatedWebUI();
 
   // Called when webui lock screen is ready.
   virtual void OnLockWebUIReady() = 0;
 
   // Called when webui lock screen wallpaper is loaded and displayed.
   virtual void OnLockBackgroundDisplayed() = 0;
 
+  // Called when the webui header bar becomes visible.
+  virtual void OnHeaderBarVisible() = 0;
+
   // Returns screen locker associated with delegate.
   ScreenLocker* screen_locker() { return screen_locker_; }
 
  protected:
   // ScreenLocker that owns this delegate.
   ScreenLocker* screen_locker_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenLockerDelegate);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_SCREEN_LOCKER_DELEGATE_H_