Add "Keep chrome running in background" preference.

chrome/common/pref_names.cc

 // 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.
 
 #include "chrome/common/pref_names.h"
 
 namespace prefs {
 
 // *************** PROFILE PREFS ***************
 // These are attached to the user profile
@@ skipping 1332 matching lines @@
     "profile.managed_plugins_blocked_for_urls";
 const char kManagedPopupsAllowedForUrls[] =
     "profile.managed_popups_allowed_for_urls";
 const char kManagedPopupsBlockedForUrls[] =
     "profile.managed_popups_blocked_for_urls";
 
 // Set to true if the user created a login item so we should not modify it when
 // uninstalling background apps.
 const char kUserCreatedLoginItem[] = "background_mode.user_created_login_item";
 
+// Set to true if background mode is enabled on this browser.
+const char kBackgroundModeEnabled[] = "background_mode.enabled";
+
 // List of protocol handlers.
 const char kRegisteredProtocolHandlers[] =
   "custom_handlers.registered_protocol_handlers";
 
 // List of protocol handlers the user has requested not to be asked about again.
 const char kIgnoredProtocolHandlers[] =
   "custom_handlers.ignored_protocol_handlers";
 
 // Whether user-specified handlers for protocols and content types can be
 // specified.
 const char kCustomHandlersEnabled[] = "custom_handlers.enabled";
 }  // namespace prefs