Refactor shutdown code to allow win/linux to run after last browser closes.

chrome/browser/browser_list.h

 // Copyright (c) 2010 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_LIST_H_
 #define CHROME_BROWSER_BROWSER_LIST_H_
 
 #include <vector>
 
 #include "base/observer_list.h"
@@ skipping 95 matching lines @@
   // more windows are remaining.  On other platforms (the Mac), this will
   // additionally exit the application.
   static void CloseAllBrowsersAndExit();
 
   // Begins shutdown of the application when the Windows session is ending.
   static void WindowsSessionEnding();
 
   // Returns true if there is at least one Browser with the specified profile.
   static bool HasBrowserWithProfile(Profile* profile);
 
-  // Returns true if browser is in persistent mode and false otherwise.
-  static bool IsInPersistentMode();
+  // Tells the BrowserList to keep the application alive after the last Browser
+  // closes. This is implemented as a count, so callers should pair their calls
+  // to StartKeepAlive() with matching calls to EndKeepAlive() when they no
+  // longer need to keep the application running.
+  static void StartKeepAlive();
+
+  // Stops keeping the application alive after the last Browser is closed.
+  // Should match a previous call to StartKeepAlive().
+  static void EndKeepAlive();
+
+  // Returns true if application will continue running after the last Browser
+  // closes.
+  static bool WillKeepAlive();
 
   static const_iterator begin() { return browsers_.begin(); }
   static const_iterator end() { return browsers_.end(); }
 
   static size_t size() { return browsers_.size(); }
 
   // Returns iterated access to list of open browsers ordered by when
   // they were last active. The underlying data structure is a vector
   // and we push_back on recent access so a reverse iterator gives the
   // latest accessed browser first.
   static const_reverse_iterator begin_last_active() {
     return last_active_browsers_.rbegin();
   }
 
   static const_reverse_iterator end_last_active() {
     return last_active_browsers_.rend();
   }
 
   // Return the number of browsers with the following profile which are
   // currently open.
   static size_t GetBrowserCount(Profile* p);
 
   // Return the number of browsers with the following profile and type which are
   // currently open.
   static size_t GetBrowserCountForType(Profile* p, Browser::Type type);
 
   // Returns true if at least one off the record session is active.
   static bool IsOffTheRecordSessionActive();
 
-  // Called when the last browser is closed.
-  static void AllBrowsersClosed();
+  // Called once there are no more browsers open and the application is exiting.
+  static void AllBrowsersClosedAndAppExiting();
 
  private:
   // Helper method to remove a browser instance from a list of browsers
   static void RemoveBrowserFrom(Browser* browser, BrowserVector* browser_list);
 
   static BrowserVector browsers_;
   static BrowserVector last_active_browsers_;
   static ObserverList<Observer> observers_;
+
+  // Counter of calls to StartKeepAlive(). If non-zero, the application will
+  // continue running after the last browser has exited.
+  static int keep_alive_count_;
 };
 
 class TabContents;
 
 // Iterates through all web view hosts in all browser windows. Because the
 // renderers act asynchronously, getting a host through this interface does
 // not guarantee that the renderer is ready to go. Doing anything to affect
 // browser windows or tabs while iterating may cause incorrect behavior.
 //
 // Example:
@@ skipping 43 matching lines @@
   // tab index into the current Browser of the current web view
   int web_view_index_;
 
   // Current TabContents, or NULL if we're at the end of the list. This can
   // be extracted given the browser iterator and index, but it's nice to cache
   // this since the caller may access the current host many times.
   TabContents* cur_;
 };
 
 #endif  // CHROME_BROWSER_BROWSER_LIST_H_