Use a Xamarin.Forms ImageSource in an UWP renderer

Hello,

I'm trying to write an UWP renderer for a Forms class which has an ImageSource property. On the other platforms one can use the various *SourceHandler classes to extract the information into native format (for use in a simple Image widget), but I can't find them in the Xamarin.Forms.Platform.UWP namespace.

What is the proper way to proceed ?