This is only the basic outline.
It doesn't do anything yet, but compile.
As there are no metrics generated for it it can't look up anything.
To note: Actual metric types are implemented in XPIDL later.
The following (priviliged) JavaScript code will soon work (if the
corresponding metrics would be defined):
const { Glean } = ChromeUtils.import("resource://gre/modules/Glean.jsm");
Glean.shared.test_only.count_things.add(1);
Differential Revision: https://phabricator.services.mozilla.com/D92211
Chris H-C
Jan-Erik Rediger