WIP: cogl-winsys-glx: Add a heuristically calculated presentation_time (3.36 backport)

The Nvidia driver (on Xorg) lacks presentation timestamps. They're always zero. This means it can unpredictably fall into triple or quad-buffering resulting in high latency and irregular stutters (when the buffer queue fills up and blocks). This branch adds heuristically calculated presentation timestamps so that doesn't happen anymore.

Closes: #1273 (closed), #1287 (closed), #1291 (closed), #818 (closed)

WIP only because this is a backport waiting for the master version !1309 (closed) to land.