Add ScopedKeepAlive to c/b/lifetime

chrome/browser/lifetime/application_lifetime.h

 // Copyright (c) 2012 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_LIFETIME_APPLICATION_LIFETIME_H_
 #define CHROME_BROWSER_LIFETIME_APPLICATION_LIFETIME_H_
 
 #include "base/compiler_specific.h"
 #include "build/build_config.h"
 
@@ skipping 52 matching lines @@
 // closes. This is implemented as a count, so callers should pair their calls
 // to IncrementKeepAliveCount() with matching calls to DecrementKeepAliveCount()
 // when they no
 // longer need to keep the application running.
 void IncrementKeepAliveCount();
 
 // Stops keeping the application alive after the last Browser is closed.
 // Should match a previous call to IncrementKeepAliveCount().
 void DecrementKeepAliveCount();
 
+// Returns the current keep alive count.
+int GetKeepAliveCountForTesting();
+
 // Returns true if application will continue running after the last Browser
 // closes.
 bool WillKeepAlive();
 #endif  // !defined(OS_ANDROID)
 
 // Emits APP_TERMINATING notification. It is guaranteed that the
 // notification is sent only once.
 void NotifyAppTerminating();
 
 // Send out notifications.
 // For ChromeOS, also request session manager to end the session.
 void NotifyAndTerminate(bool fast_path);
 
 #if !defined(OS_ANDROID)
 // Called once the application is exiting.
 void OnAppExiting();
 
 // Called once the application is exiting to do any platform specific
 // processing required.
 void HandleAppExitingForPlatform();
 
 // Disable browser shutdown for unit tests.
 void DisableShutdownForTesting(bool disable_shutdown_for_testing);
 #endif  // !defined(OS_ANDROID)
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_LIFETIME_APPLICATION_LIFETIME_H_