social/website_mass_mailing_name/views/assets.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- © 2016 Jairo Llopis <jairo.llopis@tecnativa.com>
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->

<openerp>
<data>

<template id="assets_frontend"
          inherit_id="mass_mailing.assets_frontend">
    <xpath expr=".">
        <link rel="stylesheet"
              href="/website_mass_mailing_name/static/src/css/website_mass_mailing_name.css"/>
        <script type="text/javascript"
                src="/website_mass_mailing_name/static/src/js/website_mass_mailing_name.js"/>
        <t t-if="request.registry.test_cr">
            <script type="text/javascript"
                    src="/website_mass_mailing_name/static/src/js/website_mass_mailing_name.tour.js"/>
        </t>
    </xpath>
</template>

</data>
</openerp>