public static class PolygonPainter.TessellatedPolygon
In PolygonPainter, a Polygon is converted to a TessellatedPolygon, which is then converted to an IdPolygon.
The first conversion can be done automatically by PolygonPainter -- however, such automatic conversion will
be done on the render thread. Alternatively, client code can do the first conversion explicitly, on whatever
thread is appropriate, and pass in the TessellatedPolygon.