Add api to ibus for retreiving unused config values.

memconf/config.h

 /* ibus - The Input Bus
  * Copyright (c) 2010, Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the
  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 02111-1307, USA.
  */
 
 #ifndef MEMCONF_CONFIG_H_
 #define MEMCONF_CONFIG_H_
 
 #include <map>
+#include <set>
 #include <string>
 
 #include <ibus.h>
 
 struct IBusConfigMemConf {
   IBusConfigService parent;
   // We have to use pointer type here for |entries| since g_object_new() uses
   // malloc rather than new to create IBusConfigMemConf object.
   std::map<std::string, GValue*>* entries;
+  std::set<std::string>* unread;
+  std::set<std::string>* unwritten;
 };
 
 IBusConfigMemConf* ibus_config_memconf_new(IBusConnection* connection);
 
 // These tiny hacks are necessary since memconf/main.cc which is copied
 // from gconf/main.c on compile-time uses "gconf" rather than "memconf."
 typedef IBusConfigMemConf IBusConfigGConf;
 #define ibus_config_gconf_new ibus_config_memconf_new
 
 #endif  // MEMCONF_CONFIG_H_