[mutter] (3 commits) Non-fast-forward update to branch wip/carlosg/fix-multimonitor-buffer-age

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/fix-multimonitor-buffer-age' 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:

  25361c8... cogl/egl: Warn when we fail to query a buffer age.
  73c3d1a... cogl/egl: Make surface current before querying buffer age
  335cce3... cogl/egl: Explicitly initialize age variable

Commits added to the branch:

  6df8625... cogl/egl: Warn when we fail to query a buffer age.
  522115e... cogl/egl: Make surface current before querying buffer age
  dabc17e... cogl/egl: Explicitly initialize age variable