social/bus_presence_override/views/assets.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2017 LasLabs Inc.
     License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl). -->

<odoo>

    <template id="assets_backend" name="Bus Presence Override Assets" inherit_id="web.assets_backend">
        <xpath expr="." position="inside">
            <link rel="stylesheet" href="/bus_presence_override/static/src/less/bus_presence_systray.less"/>
            <script type="text/javascript"
                    src="/bus_presence_override/static/src/js/bus_presence_systray.js"
                    />
        </xpath>
    </template>

</odoo>