[mutter] (3 commits) Non-fast-forward update to branch gbsneto/more-clutter-api

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

The branch 'gbsneto/more-clutter-api' 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:

  9b6ba2a... clutter/content: Add clutter_content_invalidate_size()
  c5faad7... clutter/paint-node: Add multitexture API
  1ebb0fd... clutter/paint-nodes: Expose ClutterLayerNode

Commits added to the branch:

  8093f97... clutter/content: Add clutter_content_invalidate_size()
  915925e... clutter/paint-node: Add multitexture API
  947cdf1... clutter/paint-nodes: Expose ClutterLayerNode