[gtkmm] Pixbuf: Add get_byte_length().

[Murray Cumming <murrayc src gnome org>]

commit 60e0b5c6990342232ddf63766b7063b65b098fd3
Author: Murray Cumming <murrayc murrayc com>
Date:   Sat Apr 5 15:33:11 2014 +0200

    Pixbuf: Add get_byte_length().

 gdk/src/pixbuf.hg |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gdk/src/pixbuf.hg b/gdk/src/pixbuf.hg
index 7637906..6833919 100644
--- a/gdk/src/pixbuf.hg
+++ b/gdk/src/pixbuf.hg
@@ -319,6 +319,8 @@ public:
   _WRAP_METHOD(int get_width() const, gdk_pixbuf_get_width)
   _WRAP_METHOD(int get_height() const, gdk_pixbuf_get_height)
   _WRAP_METHOD(int get_rowstride() const, gdk_pixbuf_get_rowstride)
+  _WRAP_METHOD(gsize get_byte_length() const, gdk_pixbuf_get_byte_length)
+
 
   _WRAP_METHOD(void fill(guint32 pixel), gdk_pixbuf_fill)