[gnome-builder] flatpak: add tracing macro for debugging

[Christian Hergert <chergert src gnome org>]

commit 256ba105014eae214e91316d818110f574a96001
Author: Christian Hergert <chergert redhat com>
Date:   Wed Sep 21 16:51:43 2016 -0700

    flatpak: add tracing macro for debugging

 plugins/flatpak/gbp-flatpak-runtime-provider.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/plugins/flatpak/gbp-flatpak-runtime-provider.c b/plugins/flatpak/gbp-flatpak-runtime-provider.c
index d4c672d..957baff 100644
--- a/plugins/flatpak/gbp-flatpak-runtime-provider.c
+++ b/plugins/flatpak/gbp-flatpak-runtime-provider.c
@@ -92,6 +92,8 @@ gbp_flatpak_runtime_provider_load_worker (GTask        *task,
       IDE_EXIT;
     }
 
+  IDE_TRACE_MSG ("Found %u installation refs", ar->len);
+
   ret = g_ptr_array_new_with_free_func (g_object_unref);
 
   for (i = 0; i < ar->len; i++)