[mutter] (14 commits) Non-fast-forward update to branch gbsneto/explicit-framebuffer-preparations

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

The branch 'gbsneto/explicit-framebuffer-preparations' 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:

  bd6af00... shadow-factory: Replace implicit API by explicit counterpar
  d877e3f... shadow-factory: Receive CoglFramebuffer
  f73470f... clutter-stage: Replace cogl_clear by cogl_framebuffer_clear
  e13a20b... clutter-stage: Pass framebuffer to read pixels from
  f5f018a... clutter-actor: Remove cogl_rectangle from pick()
  6e42587... clutter-*-effect: Remove cogl_rectangle()
  9297287... clutter-text: Replace cogl_rectangle()
  aa510b2... clutter-wayland-surface: Remove cogl_rectangle()
  950f317... clutter-texture: Remove cogl_rectangle_with_texture_coords(
  2542dad... clutter-rectangle: Remove cogl_rectangle()

Commits added to the branch:

  19930c6... backends/stage: Remove MetaStagePrivate (*)
  9adf882... backends/stage: Remove unused function declaration (*)
  213ed80... backends: Move clutter frame clock freeze/thaw API to Clutt (*)
  25c53b2... backend: Freeze frame clock when headless (*)
  1f4522d... shadow-factory: Replace implicit API by explicit counterpar
  e7a454b... shadow-factory: Receive CoglFramebuffer
  32d52e7... clutter-stage: Replace cogl_clear by cogl_framebuffer_clear
  e9cbd0a... clutter-stage: Pass framebuffer to read pixels from
  a90de42... clutter-actor: Remove cogl_rectangle from pick()
  f70358d... clutter-*-effect: Remove cogl_rectangle()
  f6ca02f... clutter-text: Replace cogl_rectangle()
  d91ccec... clutter-wayland-surface: Remove cogl_rectangle()
  fd1d3c9... clutter-texture: Remove cogl_rectangle_with_texture_coords(
  09a8eed... clutter-rectangle: Remove cogl_rectangle()

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