[mutter] (15 commits) Non-fast-forward update to branch wip/surface-content

[Jasper St. Pierre <jstpierre src gnome org>]

The branch 'wip/surface-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:

 http://live.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  2ace19c... window-actor: Remove suspicious optimization
  28599c1... surface-actor: Move unobscured_region processing here
  b293855... window-actor: Remove outdated code path
  c0fc690... window-actor: Never unredirect when under Wayland
  1e07d20... window-actor: Simplify the unredirected check in cull_out
  cd0ca39... compositor: Simplify the unredirected window management cod
  ad07d70... window-actor: Flip set_redirected around
  b0f87e9... compositor: Remove atom_x_root_pixmap
  438e7ec... Move _NET_WM_WINDOW_OPACITY handling to the standard window
  e6454c0... window-actor: Remove old unused APIs
  b0618b2... Move position-changed / size-changed signals to the MetaWin
  bb0dc96... window: Add a simple meta_window_get_toplevel_xwindow utili
  bdc36bb... window-actor: Remove (private) xwindow property
  acfcae8... window-actor: Remove meta-screen property
  d49fb72... surface content

Commits added to the branch:

  89d6207... compositor: Remove atom_x_root_pixmap
  7adb06b... Move _NET_WM_WINDOW_OPACITY handling to the standard window
  291b777... window-actor: Remove suspicious optimization
  73aa331... surface-actor: Move unobscured_region processing here
  3a4da7e... window-actor: Remove outdated code path
  a6c1415... window-actor: Never unredirect when under Wayland
  7582e0a... window-actor: Simplify the unredirected check in cull_out
  295dc9a... compositor: Simplify the unredirected window management cod
  c384884... window-actor: Flip set_redirected around
  0b15ef5... window-actor: Remove old unused APIs
  3c040c0... Move position-changed / size-changed signals to the MetaWin
  4e262cd... window: Add a simple meta_window_get_toplevel_xwindow utili
  cb49828... window-actor: Remove (private) xwindow property
  c76821f... window-actor: Remove meta-screen property
  6ab226d... surface content