Add "Keep chrome running in background" preference.

chrome/browser/ui/webui/options/advanced_options_handler.h

 // Copyright (c) 2011 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_UI_WEBUI_OPTIONS_ADVANCED_OPTIONS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_ADVANCED_OPTIONS_HANDLER_H_
 #pragma once
 
 #include "chrome/browser/prefs/pref_member.h"
 #include "chrome/browser/prefs/pref_set_observer.h"
@@ skipping 98 matching lines @@
   // Setup the enabled or disabled state of the cloud print proxy
   // management UI.
   void SetupCloudPrintProxySection();
 
   // Remove cloud print proxy section if cloud print proxy management UI is
   // disabled.
   void RemoveCloudPrintProxySection();
 
 #endif
 
+#if !defined(OS_MACOSX) && !defined(OS_CHROMEOS)
+  // Sets up the checked state for the "Continue running background apps..."
+  // checkbox.
+  void SetupBackgroundModeSettings();
+
+  // Callback for the "Continue running background apps..." checkbox.
+  void HandleBackgroundModeCheckbox(const ListValue* args);
+#endif
+
   // Setup the checked state for the metrics reporting checkbox.
   void SetupMetricsReportingCheckbox();
 
   // Setup the visibility for the metrics reporting setting.
   void SetupMetricsReportingSettingVisibility();
 
   void SetupFontSizeLabel();
 
   // Setup the download path based on user preferences.
   void SetupDownloadLocationPath();
@@ skipping 18 matching lines @@
   BooleanPrefMember cloud_print_proxy_enabled_;
   bool cloud_print_proxy_ui_enabled_;
   scoped_ptr<CloudPrintSetupHandler> cloud_print_setup_handler_;
 #endif
 
   // SSLConfigService prefs.
   BooleanPrefMember rev_checking_enabled_;
   BooleanPrefMember ssl3_enabled_;
   BooleanPrefMember tls1_enabled_;
 
+#if !defined(OS_MACOSX) && !defined(OS_CHROMEOS)
+  BooleanPrefMember background_mode_enabled_;
+#endif
+
   FilePathPrefMember default_download_location_;
   BooleanPrefMember ask_for_save_location_;
   BooleanPrefMember allow_file_selection_dialogs_;
   StringPrefMember auto_open_files_;
   IntegerPrefMember default_font_size_;
   scoped_ptr<PrefSetObserver> proxy_prefs_;
   scoped_ptr<OptionsManagedBannerHandler> banner_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(AdvancedOptionsHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_ADVANCED_OPTIONS_HANDLER_H_