web/web_widget_timepicker/views/web_widget_timepicker_assets.xml

<?xml version="1.0" encoding="utf-8"?>

<openerp>
    <data>
        <template id="web_widget_timepicker_assets_backend" name="web_widget_timepicker assets" inherit_id="web.assets_backend">
            <xpath expr="." position="inside">
                <script type="text/javascript" src="/web_widget_timepicker/static/src/lib/jquery.timepicker/jquery.timepicker.js"></script>
                <script type="text/javascript" src="/web_widget_timepicker/static/src/js/web_widget_timepicker.js"></script>
                <link rel="stylesheet" href="/web_widget_timepicker/static/src/lib/jquery.timepicker/jquery.timepicker.css"/>
                <link rel="stylesheet" href="/web_widget_timepicker/static/src/css/web_widget_timepicker.css"/>
            </xpath>
        </template>
    </data>
</openerp>