wayland: Process the keymap that is sent over from the compositor

Load the keymap from the file descriptor that the compositor has sent us and
then save that into our internal object for future use.

gdk/wayland/gdkprivate-wayland.h

@@ -33,6 +33,8 @@
 #include <gdk/gdkprivate.h>
 #include <gdk/wayland/gdkdisplay-wayland.h>
 
+#include <xkbcommon/xkbcommon.h>
+
 #include "gdkinternals.h"
 
 #include "config.h"
@@ -89,6 +91,8 @@ void _gdk_wayland_display_create_window_impl (GdkDisplay    *display,
 					      gint           attributes_mask);
 
 GdkKeymap *_gdk_wayland_display_get_keymap (GdkDisplay *display);
+void       _gdk_wayland_keymap_update_keymap (GdkKeymap  *gdk_keymap,
+                                              struct xkb_keymap *xkb_keymap);
 
 GdkWindow *_gdk_wayland_display_get_selection_owner (GdkDisplay *display,
 						 GdkAtom     selection);