[cogl] (5 commits) Non-fast-forward update to branch wip/rib/frame-synchronization

[Robert Bragg <rbragg src gnome org>]

The branch 'wip/rib/frame-synchronization' 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:

 http://live.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  5162a61... Add cogl_clock_get_time()

Commits added to the branch:

  906bb1d... glx: refer to head of info queue for swap events
  8775693... ensure _SYNC and _COMPLETE events are always dispatched
  1ffe587... cogl-hello: use new _add_frame_callback api
  17ee191... cogl-hello: use new _add_frame_callback api
  b098ff2... Add cogl_get_clock_time()