[mutter] gschema: list experimental dma-buf-screen-sharing feature

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

commit e9236415737dd677b2f0ec7bf65528110a2ce350
Author: Björn Daase <bjoern daase net>
Date:   Thu Oct 8 15:39:04 2020 +0200

    gschema: list experimental dma-buf-screen-sharing feature
    
    The key was added in 
https://gitlab.gnome.org/GNOME/mutter/-/commit/af9df1e5b62b253e5f1d5f6eff89e45e3bed81b3
    but not added to the list due to the string freeze.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1481

 data/org.gnome.mutter.gschema.xml.in | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/data/org.gnome.mutter.gschema.xml.in b/data/org.gnome.mutter.gschema.xml.in
index 7b2838948f..c4108dff03 100644
--- a/data/org.gnome.mutter.gschema.xml.in
+++ b/data/org.gnome.mutter.gschema.xml.in
@@ -126,6 +126,10 @@
                                         Requires a restart.
         • “autostart-xwayland”        — initializes Xwayland lazily if there are
                                         X11 clients. Requires a restart.
+        • “dma-buf-screen-sharing"    — enables DMA buffered screen sharing. This
+                                        is already enabled by default when using
+                                        the i915 driver, but disabled for 
+                                        everything else. Requires a restart.
       </description>
     </key>