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/gnetworkmonitorbase.c

@@ -379,6 +379,7 @@ queue_network_changed (GNetworkMonitorBase *monitor)
        */
       g_source_set_priority (source, G_PRIORITY_HIGH_IDLE);
       g_source_set_callback (source, emit_network_changed, monitor, NULL);
+      g_source_set_name (source, "[gio] emit_network_changed");
       g_source_attach (source, monitor->priv->context);
       monitor->priv->network_changed_source = source;
     }