log: new object logging support

So that we can provide the specific object id in every log associated
to a given object.

src/mm-log-object.h

@@ -0,0 +1,38 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details:
+ *
+ * Copyright (C) 2020 Aleksander Morgado <aleksander@aleksander.es>
+ */
+
+#ifndef MM_LOG_OBJECT_H
+#define MM_LOG_OBJECT_H
+
+#include <glib.h>
+#include <glib-object.h>
+
+#include "mm-log.h"
+
+#define MM_TYPE_LOG_OBJECT mm_log_object_get_type ()
+G_DECLARE_INTERFACE (MMLogObject, mm_log_object, MM, LOG_OBJECT, GObject)
+
+struct _MMLogObjectInterface
+{
+  GTypeInterface g_iface;
+
+  gchar * (* build_id) (MMLogObject *self);
+};
+
+const gchar *mm_log_object_get_id       (MMLogObject *self);
+void         mm_log_object_set_owner_id (MMLogObject *self,
+                                         const gchar *owner_id);
+
+#endif /* MM_LOG_OBJECT_H */