There are over 200 tests in the top level of LayoutTests/animations/ and most of them do not use testharness.js. It could be useful to organize the tests into more subdirectories (e.g. tests for regressions, crash regressions, deprecation warnings, API tests that could be upstreamed to the W3C suite, ...) and to rewrite some (all?) to use testharness.js.
Comment 1 by suzyh@chromium.org
, Jul 20 2016