Return a newly appended ``CT_Drawing`` (``<w:drawing>``) child
        element having *inline_or_anchor* as its child.

def add_drawing(self, inline_or_anchor):
        """
        Return a newly appended ``CT_Drawing`` (``<w:drawing>``) child
        element having *inline_or_anchor* as its child.
        """
        drawing = self._add_drawing()
        drawing.append(inline_or_anchor)
        return drawing