[gdm] session: Add support for XDG_SESSION_DESKTOP

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

commit 14253ff7b93404e2c863e06038b8797d897fbee1
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Feb 7 14:02:18 2014 -0500

    session: Add support for XDG_SESSION_DESKTOP
    
    Set $XDG_SESSION_DESKTOP to the current session name.

 daemon/gdm-session.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/daemon/gdm-session.c b/daemon/gdm-session.c
index c16f0e7..8d6583c 100644
--- a/daemon/gdm-session.c
+++ b/daemon/gdm-session.c
@@ -2272,6 +2272,9 @@ set_up_session_environment (GdmSession *self)
         gdm_session_set_environment_variable (self,
                                               "DESKTOP_SESSION",
                                               get_session_name (self));
+        gdm_session_set_environment_variable (self,
+                                              "XDG_SESSION_DESKTOP",
+                                              get_session_name (self));
 
         set_up_session_language (self);