[gnome-themes-standard/gnome-3-6] build: add some missing assets to EXTRA_DIST

[Cosimo Cecchi <cosimoc src gnome org>]

commit 2f86bdb6258169d6b71d4da2010de5aa1b3e922d
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Wed Feb 13 08:20:31 2013 -0500

    build: add some missing assets to EXTRA_DIST

 themes/Adwaita/gtk-2.0/Makefile.am |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/themes/Adwaita/gtk-2.0/Makefile.am b/themes/Adwaita/gtk-2.0/Makefile.am
index 41c13f2..4f6ca5d 100644
--- a/themes/Adwaita/gtk-2.0/Makefile.am
+++ b/themes/Adwaita/gtk-2.0/Makefile.am
@@ -113,6 +113,8 @@ asset_data = \
         Scrollbars/trough-scrollbar-horiz.png \
        Scrollbars/trough-scrollbar-vert.png \
        Shadows/frame.png \
+       Shadows/frame-gap-start.png \
+       Shadows/frame-gap-end.png \
        Spin/down-background.png \
        Spin/up-background.png \
        Spin/down-background-disable.png \