Leave apps running on Windows and Linux when quitting Chrome from the wrench menu.

chrome/browser/background/background_mode_manager.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_BACKGROUND_BACKGROUND_MODE_MANAGER_H_
 #define CHROME_BROWSER_BACKGROUND_BACKGROUND_MODE_MANAGER_H_
 
 #include <map>
 
 #include "base/gtest_prod_util.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "chrome/browser/background/background_application_list_model.h"
 #include "chrome/browser/profiles/profile_info_cache_observer.h"
 #include "chrome/browser/status_icons/status_icon.h"
 #include "chrome/browser/status_icons/status_icon_menu_model.h"
+#include "chrome/browser/ui/browser_list_observer.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Browser;
 class CommandLine;
 class PrefRegistrySimple;
 class Profile;
 class ProfileInfoCache;
 class StatusIcon;
@@ skipping 12 matching lines @@
 // installed/loaded extensions to ensure that Chrome enters/exits background
 // mode at the appropriate time.
 //
 // When Chrome is in background mode, it will continue running even after the
 // last browser window is closed, until the user explicitly exits the app.
 // Additionally, when in background mode, Chrome will launch on OS login with
 // no open windows to allow apps with the "background" permission to run in the
 // background.
 class BackgroundModeManager
     : public content::NotificationObserver,
+      public chrome::BrowserListObserver,
       public BackgroundApplicationListModel::Observer,
       public ProfileInfoCacheObserver,
       public StatusIconMenuModel::Delegate {
  public:
   BackgroundModeManager(CommandLine* command_line,
                         ProfileInfoCache* profile_cache);
   virtual ~BackgroundModeManager();
 
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
   virtual void RegisterProfile(Profile* profile);
 
   static void LaunchBackgroundApplication(Profile* profile,
       const extensions::Extension* extension);
 
   // Returns true if background mode is active.
   virtual bool IsBackgroundModeActive();
 
+  // Suspends background mode until either ResumeBackgroundMode is called or
+  // Chrome is restarted. This has the same effect as ending background mode
+  // until for the current browser session.

[benwells, 2013/10/20 23:46:22]

Nit: until for what?

[Sam McNally, 2013/10/21 04:31:03]

Done.

+  virtual void SuspendBackgroundMode();
+
+  // Resumes background mode. This ends a suspension of background mode, but
+  // will not start it if it is not enabled.
+  virtual void ResumeBackgroundMode();
+
+  virtual void OnBrowserAdded(Browser* browser) OVERRIDE;

[benwells, 2013/10/20 23:46:22]

Nit: Make private, and add comment for what interface / class this is overriding
from, like:
  // chrome::BrowserListObserver:

[Sam McNally, 2013/10/21 04:31:03]

Done.

+
   // For testing purposes.
   int NumberOfBackgroundModeData();
 
  private:
   friend class AppBackgroundPageApiTest;
   friend class BackgroundModeManagerTest;
   friend class TestBackgroundModeManager;
   FRIEND_TEST_ALL_PREFIXES(BackgroundModeManagerTest,
                            BackgroundAppLoadUnload);
   FRIEND_TEST_ALL_PREFIXES(BackgroundModeManagerTest,
@@ skipping 219 matching lines @@
   // Set when we are keeping chrome running during the startup process - this
   // is required when running with the --no-startup-window flag, as otherwise
   // chrome would immediately exit due to having no open windows.
   bool keep_alive_for_startup_;
 
   // Set to true when Chrome is running with the --keep-alive-for-test flag
   // (used for testing background mode without having to install a background
   // app).
   bool keep_alive_for_test_;
 
+  // Set to true when background mode is suspended.
+  bool background_mode_suspended_;
+
   // Provides a command id for each profile as they are created.
   int current_command_id_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundModeManager);
 };
 
 #endif  // CHROME_BROWSER_BACKGROUND_BACKGROUND_MODE_MANAGER_H_