Minor change to bokeh ElementPlot internal API
Minor change to bokeh ElementPlot internal API

vascotenner/holoviews,mjabri/holoviews,ioam/holoviews,ioam/holoviews,ioam/holoviews,vascotenner/holoviews,vascotenner/holoviews,mjabri/holoviews,basnijholt/holoviews,mjabri/holoviews,basnijholt/holoviews,basnijholt/holoviews