Re: [slightlyoff/ServiceWorker] Install algorithm step 14 should clear waiting worker before updating state to redundant (#851)

> The promises guide is just a placeholder until that language lands in IDL. It's a rather weird setup the way we have it now.

I agree to the direction but think the promises guide is the reference that other promise-using specs should rely on in the mean time.

> It gets hairy when you have to queue a task and resolve the promise from there (does that queue another task?).

If you queued a task to settle a promise, then wouldn't it be running in a main thread already (in which case https://github.com/slightlyoff/ServiceWorker/issues/851#issuecomment-215283809 says it doesn't queue another task)?

Wouldn't it make sense that IDL specifies the following behavior?
> If the algorithm using these shorthands is running in parallel, the shorthands queue a task on p’s relevant settings object’s responsible event loop to call the stored function **using the DOM manipulation task source**.

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