Add desynchronized (low latency canvas contexts)

[geek2focus]

Please add desynchronized canvas option to caniuse.

See https://www.chromestatus.com/feature/6360971442388992 and https://developers.google.com/web/updates/2019/05/desynchronized

[Schweinepriester]

Available via MDN now: https://caniuse.com/?search=desynchronized