[mutter] (4 commits) Non-fast-forward update to branch gbsneto/offscreen-paint-node

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

The branch 'gbsneto/offscreen-paint-node' 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:

  378e002... clutter/offscreen-effect: Implement paint_node()
  661a6f8... clutter/effect: Add paint nodes to all paint vfuncs
  fcd5d95... clutter/offscreen-effect: Document paint nodes
  ec0eb0c... clutter/effect: Move ClutterEffect creation to ClutterActor

Commits added to the branch:

  22e5055... clutter/offscreen-effect: Implement paint_node()
  a217f21... clutter/effect: Add paint nodes to all paint vfuncs
  965d7cb... clutter/offscreen-effect: Document paint nodes
  d9bbba7... clutter/effect: Move ClutterEffect creation to ClutterActor