Due to a security vulnerability just reported to the Chrome team, it's urgently necessary to do the following:
1) Disable WebGL's EXT_disjoint_timer_query and EXT_disjoint_timer_query_webgl2 extensions.
2) Change the semantics of sync objects in the WebGL 2.0 specification so that they don't become signaled in the same frame they were issued. A similar restriction was added to query objects some time ago.
More information forthcoming.
Comment 1 by kbr@chromium.org
, Feb 5 2018