social/mail_edit/views/assets.xml

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

<openerp>
    <data>

        <template id="assets_backend" name="Mail edit assets"
                  inherit_id="web.assets_backend">
            <xpath expr="." position="inside">
                <link rel="stylesheet"
                      href="/mail_edit/static/src/css/mail_edit.css"/>
                <script type="text/javascript"
                        src="/mail_edit/static/src/js/mail_edit.js"/>
            </xpath>
        </template>

    </data>
</openerp>