Author: Zig Tan
MDL-61881 report_performance: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6bc3ca7a4cb3353d23e34623a23ed14ddf623a5c
http://github.com/moodle/moodle/commit/6bc3ca7a4cb3353d23e34623a23ed14ddf623a5c
+ 3.3 en [privacy:metadata,report_performance]