[mutter] (8 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:

  fd99a56... clutter/content: Add clutter_content_invalidate_size()
  d5262f0... clutter/paint-node: Add multitexture API
  41ece85... clutter/paint-nodes: Expose ClutterLayerNode
  e1c272e... clutter/image: Also invalidate size

Commits added to the branch:

  a08d7cf... wayland: Update gtk-shell protocol to v3 (*)
  177b4df... wayland: Implement window activation and focus stealing pre (*)
  1e71bd9... clutter/content: Add clutter_content_invalidate_size()
  4e6848f... clutter/image: Also invalidate size
  90057f6... clutter/paint-node: Add multitexture API
  65e97fa... clutter/paint-node: Expose clutter_paint_node_paint()
  569ab07... clutter/paint-nodes: Expose ClutterRootNode
  3d5ada0... clutter/paint-nodes: Push/pop framebuffer

(*) This commit already existed in another branch; no separate mail sent