Add BackgroundModeOptimizer that can restart the browser

chrome/browser/browser_shutdown.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_BROWSER_SHUTDOWN_H_
 #define CHROME_BROWSER_BROWSER_SHUTDOWN_H_
 
 #include "build/build_config.h"
 
 class PrefRegistrySimple;
@@ skipping 52 matching lines @@
 // except from appropriate places in BrowserList. To quit, use usual means,
 // e.g., using |chrome_browser_application_mac::Terminate()| on the Mac, or
 // |BrowserList::CloseAllWindowsAndExit()| on other platforms. To stop quitting,
 // use |chrome_browser_application_mac::CancelTerminate()| on the Mac; other
 // platforms can call SetTryingToQuit(false) directly.
 void SetTryingToQuit(bool quitting);
 
 // General accessor.
 bool IsTryingToQuit();
 
+// Controls whether when restarting the browser should be in the background
+// by adding the kNoStartupWindow switch to the command line.
+void SetShouldRestartInBackground(bool should_restart_in_background);
+
 // Starts to collect shutdown traces. On ChromeOS this will start immediately
 // on AttemptUserExit() and all other systems will start once all tabs are
 // closed.
 void StartShutdownTracing();
 
 }  // namespace browser_shutdown
 
 #endif  // CHROME_BROWSER_BROWSER_SHUTDOWN_H_