SugarExt: make SugarGrid introspectable

This will be used by a future GTK3 port of the shell.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Simon Schampijer <simon@laptop.org>

src/sugar3/Makefile.am

@@ -132,6 +132,8 @@ SugarExt_1_0_gir_FILES = \
 	gsm-xsmp.h \
 	sugar-key-grabber.c \
 	sugar-key-grabber.h \
+	sugar-grid.c \
+	sugar-grid.h \
 	gdk-wrapper.c \
 	gdk-wrapper.h \
 	rsvg-wrapper.c \