[mutter] (12 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:

  3b6d60b... clutter/paint-node: Expose clutter_paint_node_get_framebuff
  069e45d... shaped-texture: Implement ClutterContent
  f679507... wayland/actor-surface: Set geometry scale in surface actor
  915d4ed... shaped-texture: Draw pipeline relative to alloc
  9031849... shaped-texture: Move MetaCullable helpers to MetaSurfaceAct
  f434a56... shaped-texture: Move private function to private header
  b2a5aab... wayland/tablet-tool: Use meta_wayland_surface_get_relative_
  46b88fa... wayland: Don't scale input and opaque regions
  5ba3450... window-actor: Handle geometry scale

Commits added to the branch:

  57772e5... workspace-manager: Fix a documentation warning (*)
  73bc3c4... window-actor: Add API to get a MetaWindowActor from a Clutt (*)
  62f576e... events: Use new API to get MetaWindow from ClutterActor (*)
  faa3259... clutter/paint-node: Expose clutter_paint_node_get_framebuff
  76ba208... shaped-texture: Implement ClutterContent
  0b75a8e... wayland/actor-surface: Set geometry scale in surface actor
  9c8c829... shaped-texture: Draw pipeline relative to alloc
  0eaa0b9... shaped-texture: Move MetaCullable helpers to MetaSurfaceAct
  9f40adf... shaped-texture: Move private function to private header
  bebb958... wayland/tablet-tool: Use meta_wayland_surface_get_relative_
  bef6d3c... wayland: Don't scale input and opaque regions
  e6ad1d6... window-actor: Handle geometry scale

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