recorder: save recorded video as recent item

Often the first thing a user wants to do after making a recording
is post it somewhere.

This commit adds the video to recently used items, so that it shows
up prominently in open file choosers.

https://bugzilla.gnome.org/show_bug.cgi?id=680647

src/test-recorder.c

@@ -3,6 +3,7 @@
 #define GST_USE_UNSTABLE_API
 #include "shell-recorder.h"
 #include <clutter/clutter.h>
+#include <gtk/gtk.h>
 #include <gst/gst.h>
 
 /* Very simple test of the ShellRecorder class; shows some text strings
@@ -57,6 +58,7 @@ int main (int argc, char **argv)
   ClutterAnimation *animation;
   ClutterColor red, green, blue;
 
+  gtk_init (&argc, &argv);
   gst_init (&argc, &argv);
   if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
     return 1;