[mutter] (16 commits) Non-fast-forward update to branch gbsneto/effects-paint-nodes

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

The branch 'gbsneto/effects-paint-nodes' 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:

  53aa04f... clutter/effect: Don't expose pre and post paint helpers
  a3ec4b1... clutter/effect: Add paint_node vfunc
  faecad3... clutter/offscreen-effect: Clear framebuffer on pre_paint
  b01feda... clutter/offscreen-effect: Simplify paint
  30a1912... clutter/paint-nodes: Don't skip pipeline node constructor
  81b6a04... clutter/paint-nodes: Add new ClutterLayerNode API
  4959891... clutter/paint-nodes: Push and pop framebuffer even without 
  d25efa8... clutter/paint-nodes: Add serialization to layer node
  a5bffde... Introduce ClutterBlitNode

Commits added to the branch:

  9823a0f... background-content: Fix an x/y mixup (*)
  162aec7... clutter: Replace ClutterActors resource-scale property with (*)
  802b24a... clutter/backend: Introduce a fallback scale set to primary  (*)
  4a72ac0... clutter/actor: Use stage-views list for resource scales (*)
  98df2db... clutter/actor: Always return a resource scale in get_resour (*)
  280429b... clutter: Add private API to support resource scale affectin (*)
  c5159e3... clutter/text: Enable relayout on resource-scale changes (*)
  e3a296c... clutter/effect: Don't expose pre and post paint helpers
  6bebca6... clutter/effect: Add paint_node vfunc
  b0794f0... clutter/offscreen-effect: Clear framebuffer on pre_paint
  5ef260b... clutter/offscreen-effect: Simplify paint
  dd9213b... clutter/paint-nodes: Don't skip pipeline node constructor
  fa22b88... clutter/paint-nodes: Add new ClutterLayerNode API
  e1afe2b... clutter/paint-nodes: Push and pop framebuffer even without 
  1258f0d... clutter/paint-nodes: Add serialization to layer node
  70ed65f... Introduce ClutterBlitNode

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