* glib/dbus-binding-tool-glib.h (DBUS_GLIB_ANNOTATION_CONST):
	Define.

	* glib/dbus-binding-tool-glib.c (generate_glue): Handle Const
	annotation.

	* glib/dbus-gobject.c (arg_iterate): Update to parse constval too.
	(method_dir_signature_from_object_info): Handle arg_iterate change.
	(write_interface): Ditto.
	(lookup_object_info): Don't barf if format_version is > 0.
	(invoke_object_method): Handle arg constness.

	* glib/dbus-gidl.c (struct ArgInfo): Add annotations.
	(arg_info_new): Create.
	(arg_info_unref): Destroy.
	(arg_info_get_annotations, arg_info_get_annotation)
	(arg_info_add_annotation): New functions.

	* glib/dbus-gidl.h: Prototype them.

	* glib/dbus-gparser.c (parse_annotation): Allow annotations in
	args, disallow them in properties.
	(parse_annotation): Handle arg annotations.

	* test/glib/test-service-glib.xml:
	* test/glib/test-service-glib.c: Update to make some methods
	const.