gio: Add names to idles and timeouts

This isn't too useful for some of the "return result in idle"
functions, but it's better than nothing.

https://bugzilla.gnome.org/show_bug.cgi?id=726872

gio/gdbusnameowning.c

@@ -197,6 +197,7 @@ schedule_call_in_idle (Client *client, CallType  call_type)
                          call_in_idle_cb,
                          data,
                          (GDestroyNotify) call_handler_data_free);
+  g_source_set_name (idle_source, "[gio] call_in_idle_cb");
   g_source_attach (idle_source, client->main_context);
   g_source_unref (idle_source);
 }