[mutter] (3 commits) Non-fast-forward update to branch gbsneto/offscreen-fix

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

The branch 'gbsneto/offscreen-fix' 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:

  4987bd4... clutter/offscreen-effect: Clear offscreen framebuffer when 
  4afc5d0... clutter/offscreen-effect: Clear offscreen when pre-paint fa
  ed27725... clutter/brightness-contrast-effect: Compare float with G_AP

Commits added to the branch:

  bf594e9... clutter/offscreen-effect: Clear offscreen framebuffer when 
  64685f4... clutter/offscreen-effect: Clear offscreen when pre-paint fa
  84ea4ad... clutter/brightness-contrast-effect: Compare float with G_AP