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

chrome/browser/background/background_mode_manager.h

Index: chrome/browser/background/background_mode_manager.h
diff --git a/chrome/browser/background/background_mode_manager.h b/chrome/browser/background/background_mode_manager.h
index 0494f5a2abde2d94d568fa040e1ab993c5ea767d..b102743da5b7292a05f4c8713767c53210b4d541 100644
--- a/chrome/browser/background/background_mode_manager.h
+++ b/chrome/browser/background/background_mode_manager.h
@@ -13,6 +13,7 @@
 #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"
@@ -45,6 +46,7 @@ class Extension;
 // background.
 class BackgroundModeManager
     : public content::NotificationObserver,
+      public chrome::BrowserListObserver,
       public BackgroundApplicationListModel::Observer,
       public ProfileInfoCacheObserver,
       public StatusIconMenuModel::Delegate {
@@ -63,6 +65,15 @@ class BackgroundModeManager
   // 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
+  // for the current browser session.
+  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();
+
   // For testing purposes.
   int NumberOfBackgroundModeData();
 
@@ -176,6 +187,9 @@ class BackgroundModeManager
   // Overrides from StatusIconMenuModel::Delegate implementation.
   virtual void ExecuteCommand(int command_id, int event_flags) OVERRIDE;
 
+  // chrome::BrowserListObserver implementation.
+  virtual void OnBrowserAdded(Browser* browser) OVERRIDE;
+
   // Invoked when an extension is installed so we can ensure that
   // launch-on-startup is enabled if appropriate. |extension| can be NULL when
   // called from unit tests.
@@ -202,14 +216,14 @@ class BackgroundModeManager
   // and has a status bar icon.
   void StartBackgroundMode();
 
-  // Invoked to create the status icon if any profiles currently running
-  // background apps so that there is a way to exit Chrome.
-  void InitStatusTrayIcon();
-
   // Invoked to take Chrome out of KeepAlive mode - chrome stops running in
   // the background and removes its status bar icon.
   void EndBackgroundMode();
 
+  // Enables keep alive and the status tray icon if and only if background mode
+  // is active and not suspended.
+  void UpdateKeepAliveAndTrayIcon();
+
   // If --no-startup-window is passed, BackgroundModeManager will manually keep
   // chrome running while waiting for apps to load. This is called when we no
   // longer need to do this (either because the user has chosen to exit chrome
@@ -302,6 +316,12 @@ class BackgroundModeManager
   // app).
   bool keep_alive_for_test_;
 
+  // Set to true when background mode is suspended.
+  bool background_mode_suspended_;
+
+  // Set to true when background mode is keeping Chrome alive.
+  bool keeping_alive_;
+
   // Provides a command id for each profile as they are created.
   int current_command_id_;