Re: [whatwg/dom] Add AbortSignal.timeout(ms) (#951)

One thing that's very useful in Golang is the context objects concept of deadlines - and importantly the nesting. One can create a context with a deadline of, say, 10s from now, then a context can be created from that context but the deadline can only be created to have a window as large as the remaining time of the parent deadline. 

The reason nested deadlines are useful is because you can dictate nested windows of time at a granular level; for example a server framework might set a deadline for the whole request to be 10s while the logic that makes a db request has a deadline for 2s. Rather than extending the total request time to 12s the child deadline will only be given the total remaining time of the parent, meaning the top most deadlines time window is always honoured. 

This could be realised in AbortControllers with timeouts if they exposed the remaining time before a timeout was triggered, perhaps as a getter. 

I'm not specifically advocating for this feature as a bandwagon to this issue, but I'd be interested to know if the setTimeout avenue prevents this as a possible future? 

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