[clutter] backend: Store the type of the StageWindow implementation

[Emmanuele Bassi <ebassi src gnome org>]

commit 6082be409ee3f64770170e73323a2df5b50084c2
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Fri Nov 4 18:26:33 2011 +0000

    backend: Store the type of the StageWindow implementation
    
    We can use it later on to create it and provide a default create_stage()
    implementation.

 clutter/clutter-backend-private.h |    2 ++
 clutter/clutter-backend.c         |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/clutter/clutter-backend-private.h b/clutter/clutter-backend-private.h
index 495aec3..c9ba24a 100644
--- a/clutter/clutter-backend-private.h
+++ b/clutter/clutter-backend-private.h
@@ -53,6 +53,8 @@ struct _ClutterBackendClass
   /*< private >*/
   GObjectClass parent_class;
 
+  GType stage_window_type;
+
   /* vfuncs */
   gboolean              (* pre_parse)          (ClutterBackend  *backend,
                                                 GError         **error);
diff --git a/clutter/clutter-backend.c b/clutter/clutter-backend.c
index de7ece3..9cabfad 100644
--- a/clutter/clutter-backend.c
+++ b/clutter/clutter-backend.c
@@ -512,6 +512,8 @@ clutter_backend_class_init (ClutterBackendClass *klass)
 
   g_type_class_add_private (gobject_class, sizeof (ClutterBackendPrivate));
 
+  klass->stage_window_type = G_TYPE_INVALID;
+
   /**
    * ClutterBackend::resolution-changed:
    * @backend: the #ClutterBackend that emitted the signal