Re: [w3c/ServiceWorker] Add FetchEvent.handled (#1397) (#1496)

tingshao commented on this pull request.



> -          1. Invoke [=Update Service Worker Extended Events Set=] with |activeWorker| and |e|.
-          1. If |e|'s [=FetchEvent/respond-with entered flag=] is set, set |respondWithEntered| to true.
-          1. If |e|'s [=FetchEvent/wait to respond flag=] is set, then:
-              1. Wait until |e|'s [=FetchEvent/wait to respond flag=] is unset.
-              1. If |e|'s [=FetchEvent/respond-with error flag=] is set, set |handleFetchFailed| to true.
-              1. Else, set |response| to |e|'s [=FetchEvent/potential response=].
-          1. If |e|'s <a>canceled flag</a> is set, set |eventCanceled| to true.
-          1. If |fetchInstance| is [=fetch/terminated=], then [=queue a task=] to [=AbortSignal/signal abort=] on |requestObject|'s {{Request/signal}}.
-
-          If |task| is discarded, set |handleFetchFailed| to true.
-
-          The |task| *must* use |activeWorker|'s <a>event loop</a> and the <a>handle fetch task source</a>.
+      1. Else:
+          1. Let |workerRealm| be the [=relevant realm=] of the |activeWorker|'s [=service worker/global object=].
+          1. Set |eventHandled| to [=a new promise=] in |workerRealm|.
+          1. [=queue a task=] |task| to run the following substeps:

Done

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