[gtk+] wayland: Acquire wl_subcompositor interface

[Carlos Garnacho <carlosg src gnome org>]

commit ad9da99d86af6dd9d0be696ac5173aba12600527
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Aug 21 17:27:26 2014 +0200

    wayland: Acquire wl_subcompositor interface
    
    This will be needed for GDK_WINDOW_SUBSURFACE windows.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=729215

 gdk/wayland/gdkdisplay-wayland.c |    4 ++++
 gdk/wayland/gdkdisplay-wayland.h |    1 +
 2 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gdk/wayland/gdkdisplay-wayland.c b/gdk/wayland/gdkdisplay-wayland.c
index 15e4cdc..0cc7eaa 100644
--- a/gdk/wayland/gdkdisplay-wayland.c
+++ b/gdk/wayland/gdkdisplay-wayland.c
@@ -177,6 +177,10 @@ gdk_registry_handle_global(void *data, struct wl_registry *registry, uint32_t id
       display_wayland->data_device_manager =
         wl_registry_bind(display_wayland->wl_registry, id,
                                        &wl_data_device_manager_interface, 1);
+  } else if (strcmp (interface, "wl_subcompositor") == 0) {
+    display_wayland->subcompositor =
+      wl_registry_bind (display_wayland->wl_registry, id,
+                        &wl_subcompositor_interface, 1);
   }
 }
 
diff --git a/gdk/wayland/gdkdisplay-wayland.h b/gdk/wayland/gdkdisplay-wayland.h
index 3098e54..8393b23 100644
--- a/gdk/wayland/gdkdisplay-wayland.h
+++ b/gdk/wayland/gdkdisplay-wayland.h
@@ -62,6 +62,7 @@ struct _GdkWaylandDisplay
   struct gtk_shell *gtk_shell;
   struct wl_input_device *input_device;
   struct wl_data_device_manager *data_device_manager;
+  struct wl_subcompositor *subcompositor;
 
   struct wl_cursor_theme *cursor_theme;
   GHashTable *cursor_cache;