[mutter] (5 commits) Non-fast-forward update to branch gbsneto/content

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

The branch 'gbsneto/content' 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:

  7d3c639... clutter/paint-node: Expose clutter_paint_node_get_framebuff
  df9ac5a... shaped-texture: Implement ClutterContent
  c8f96b0... shaped-texture: Draw pipeline relative to alloc
  ea112b2... shaped-texture: Move MetaCullable helpers to MetaSurfaceAct
  3433acb... shaped-texture: Move private function to private header

Commits added to the branch:

  e0ad0b8... clutter/paint-node: Expose clutter_paint_node_get_framebuff
  cb6a445... shaped-texture: Implement ClutterContent
  d767189... shaped-texture: Draw pipeline relative to alloc
  03f066e... shaped-texture: Move MetaCullable helpers to MetaSurfaceAct
  ff2a129... shaped-texture: Move private function to private header