web/web_dashboard_tile/views/templates.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--***************************************************************************
    Web - Custom Element Number in ListView module for Odoo
    Copyright (C) 2015-Today Akretion (http://www.akretion.com)
    @author Sylvain LE GAL (https://twitter.com/legalsylvain)

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program 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 Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
****************************************************************************-->

<openerp>
    <data>
        <template id="assets_backend" name="web_dashboard_tile assets" inherit_id="web.assets_backend">
            <xpath expr="." position="inside">
                <link rel="stylesheet"
                    href="/web_dashboard_tile/static/src/css/tile.css"/>
                <script type="text/javascript"
                    src="/web_dashboard_tile/static/src/js/custom_js.js">
                </script>
            </xpath>
        </template>
    </data>
</openerp>