Re: [whatwg/dom] Define a 'CancelationController' and 'CancelationSignal' interface. (#434)

@jyasskin: The semantics are a bit more complex, as it also handles registration of parts of the graph when the source is closed (reduces memory costs as callbacks can be garbage collected). It greatly simplifies a common pattern for moderate to advanced scenarios, but is only really useful if you have a shared and consistent cancellation API across many scenarios in an application.

It is also more consistent to have the API support linked tokens if `cancel` runs in a different turn and reports exceptions via a Promise as 'prex' does, as that adds additional complexity to have to write manually.

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