[mutter] wayland: Sync protocol/gtk-shell.xml from GTK+

[Jonas Ådahl <jadahl src gnome org>]

commit cfba0a5dfcbc2c921c171ac370e699aa44ffb376
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Mar 6 10:40:07 2015 +0800

    wayland: Sync protocol/gtk-shell.xml from GTK+
    
    Had added a new capability enum value.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=745720

 src/wayland/protocol/gtk-shell.xml |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/wayland/protocol/gtk-shell.xml b/src/wayland/protocol/gtk-shell.xml
index e2cc4f4..a8a83eb 100644
--- a/src/wayland/protocol/gtk-shell.xml
+++ b/src/wayland/protocol/gtk-shell.xml
@@ -4,6 +4,7 @@
     <enum name="capability">
       <entry name="global_app_menu" value="1"/>
       <entry name="global_menu_bar" value="2"/>
+      <entry name="desktop_icons" value="3"/>
     </enum>
 
     <event name="capabilities">