Re: [w3c/ServiceWorker] Improve handling of extend lifetime promises (#1049)

@jakearchibald, @annevk, this is about (1) introducing reference count for checking extend lifetime promises and (2) allowing `e.waitUntil()` in the given promise's promise.then callbacks. Your review would be appreciated.

@domenic, it'd be great if you had time to review these particular steps where I referenced ECMAScript internal slots:
 - https://github.com/w3c/ServiceWorker/pull/1049/commits/3210c4d08619341accee4d4a84eb161273297afd#diff-27b79860afe28f01aed4f1f6228367faR2878
 - https://github.com/w3c/ServiceWorker/pull/1049/commits/3210c4d08619341accee4d4a84eb161273297afd#diff-27b79860afe28f01aed4f1f6228367faR2880

/cc @wanderview 

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