Fixes bug where triggering session restore while the browser was...

chrome/browser/sessions/session_service.h

Index: chrome/browser/sessions/session_service.h
===================================================================
--- chrome/browser/sessions/session_service.h	(revision 42688)
+++ chrome/browser/sessions/session_service.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -53,6 +53,13 @@
   // For testing.
   explicit SessionService(const FilePath& save_path);
 
+  // Invoke at a point when you think session restore might occur. For example,
+  // during startup and window creation this is invoked to see if a session
+  // needs to be restored. If a session needs to be restored it is done so
+  // asynchronously and true is returned. If false is returned the session was
+  // not restored and the caller needs to create a new window.
+  bool RestoreIfNecessary(const std::vector<GURL>& urls_to_open);
+
   // Resets the contents of the file from the current state of all open
   // browsers whose profile matches our profile.
   void ResetFromCurrentBrowsers();
@@ -180,6 +187,11 @@
 
   void Init();
 
+  // Implementation of RestoreIfNecessary. If |browser| is non-null and we need
+  // to restore, the tabs are added to it, otherwise a new browser is created.
+  bool RestoreIfNecessary(const std::vector<GURL>& urls_to_open,
+                          Browser* browser);
+
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);