Before this commit, there was no livechat menu when accessing it from the customer URL, e.g. `http://mycompany.odoo.com/im_livechat/support/1`) This is due to missing JS modules, such as the root widget. Also, the crosstab polling directly requires the session module, because the public root widget does not return the session module from the OdooEvent `get_session`. Task-ID 1885445 Co-authored-by: Mohammed Shekha <msh@openerp.com>