[$] A memory allocation API for graphics devices

At lastyear's X.Org Developers Conference (XDC), James Jones began the process of coming up with an API forallocating memory so that it is accessible to multiple different graphicsdevices in a system (e.g. GPUs, hardware compositors, video decoders, displayhardware, cameras, etc.). At XDC 2017 in MountainView, CA, he was back to update attendees on the progress that has beenmade. He has a prototype in progress, but there is plenty more to do,including working out some of the problems he has encountered along the way.