- Add CefRunMessageLoop() for efficient message loop usage and modify cefclient to use it.
- Add CefHandler::HandleNavStateChange() for back/forward state notifications and modify cefclient to use it.
git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@208 5089003a-bbd8-11dd-ad1f-f1f9622dbc98