Set background system priority for the group scheduler.

Original commit from Philip Van Hoof. I modified it to only include the
headers we absolutely need.

Conflicts:

	tumblerd/tumbler-group-scheduler.c

1 files changed, 2 insertions, 0 deletions

diff --git a/tumblerd/tumbler-scheduler.h b/tumblerd/tumbler-scheduler.h
index 733e5aa..db5445e 100644
--- a/tumblerd/tumbler-scheduler.h
+++ b/tumblerd/tumbler-scheduler.h
@@ -81,6 +81,8 @@ gint                     tumbler_scheduler_request_compare       (gconstpointer
                                                                   gconstpointer            b,
                                                                   gpointer                 user_data);
 
+void                     tumbler_scheduler_thread_use_lower_priority (void);
+
 struct _TumblerSchedulerRequest
 {
   TumblerThumbnailer **thumbnailers;