Sync to the hardware refresh rate, not just 60.00Hz

Sync to the hardware refresh rate, not just 60.00Hz

The Clutter master clock supports three synchronization methods in order of
preference:
  (a) Hardware presentation times
  (b) Swap throttling
  (c) Fake vsync at 60.00Hz
X11 already supports all three but Wayland only has (c). This patch implements
both (a) and (b) for Wayland bringing it in line with X11.

Origin: https://gitlab.gnome.org/GNOME/mutter/merge_requests/171 via backport https://gitlab.gnome.org/GNOME/mutter/merge_requests/318
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=781296
Bug-Ubuntu: https://bugs.launchpad.net/bugs/1763892
Forwarded: yes
Last-Update: 2018-11-23

Gbp-Pq: Name Sync-to-the-hardware-refresh-rate-not-just-60.00Hz.patch