[gtk] (5 commits) Non-fast-forward update to branch wip/on-the-fence-about-damage

[Ray Strode <halfline src gnome org>]

The branch 'wip/on-the-fence-about-damage' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  977cb65... gdkframeclockidle: handle frame clock getting frozen during
  158466e... wip! gdkdisplay-x11: Add support for the damage extension
  5fa6c97... wip! gdkdisplay-x11: flag nvidia as needing special damage 
  53c5b8c... wip! gdkglcontext-x11: freeze frame clock while driver fini
  655df4e... fixup! gdkframeclockidle: handle frame clock getting frozen
  2588a6d... fixup! gdkframeclockidle: handle frame clock getting frozen
  7b32ee4... fixup! wip! gdkglcontext-x11: freeze frame clock while driv

Commits added to the branch:

  504f890... gdkframeclockidle: handle frame clock getting frozen during
  93f1e72... wip! gdkdisplay-x11: Add support for the damage extension
  52246a5... wip! gdkdisplay-x11: flag nvidia as needing special damage 
  f3cced1... wip! gdkglcontext-x11: freeze frame clock while driver fini
  c660175... xxx! add alex's hack for getting reproducible timings