add window.queueMicrotask

[karlseguin]

No description provided.

[sjorsdonkers]

LGTM

[krichprollsch]

I don't think it changes anything but maybe we should use EnqueueMicrotask ?

[karlseguin]

I'd like to keep it as is. It makes setTimeout, setInterval, requestAnimationFrame, requestIdleCallback (TBD) and queueMicrotask all have the same implementation. It's also 1 less layer of indirection and keeps control of it in our code, rather than passing it to v8.

Practically, there isn't much difference, since the v8 microtask is itself run from a IO loop timeout and both will run on the next run call.