Persist the order of extensions in the browser action toolbar across sessions...

chrome/browser/extensions/extension_toolbar_model.h

Index: chrome/browser/extensions/extension_toolbar_model.h
===================================================================
--- chrome/browser/extensions/extension_toolbar_model.h	(revision 34323)
+++ chrome/browser/extensions/extension_toolbar_model.h	(working copy)
@@ -52,6 +52,14 @@
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
+  // To be called after the extension service is ready; gets loaded extensions
+  // from the extension service and their saved order from the pref service
+  // and constructs |toolitems_| from these data.
+  void InitializeExtensionList();
+
+  // Save the model to prefs.
+  void UpdatePrefs();
+
   // Our observers.
   ObserverList<Observer> observers_;