web/web_widget_bokeh_chart/views/web_widget_bokeh_chart.xml

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

    <template id="assets_backend" name="web_widget_bokeh_chart assets"
              inherit_id="web.assets_backend">
        <xpath expr="." position="inside">
            <link rel="stylesheet" href="/web_widget_bokeh_chart/static/src/lib/bokeh/bokeh-0.12.7.css"/>
            <link rel="stylesheet" href="/web_widget_bokeh_chart/static/src/lib/bokeh/bokeh-widgets-0.12.7.css"/>
            <script type="text/javascript" src="/web_widget_bokeh_chart/static/src/lib/bokeh/bokeh-0.12.7.js"/>
            <script type="text/javascript" src="/web_widget_bokeh_chart/static/src/lib/bokeh/bokeh-widgets-0.12.7.js"/>
            <script type="text/javascript" src="/web_widget_bokeh_chart/static/src/js/web_widget_bokeh_chart.js"/>
        </xpath>
    </template>

</odoo>