Re: [w3c/ServiceWorker] ServiceWorkerAutoPreload (PR #1756)

@yoshisatoyanagisawa commented on this pull request.



> +                      1. If |navigationPreloadResponse|'s [=response/type=] is "`error`", reject |preloadResponse| with a `TypeError` and terminate these substeps.
+                      1. Associate |preloadResponseObject| with |navigationPreloadResponse|.
+                      1. Resolve |preloadResponse| with |preloadResponseObject|.
+              1. [=If aborted=], then:
+                  1. Let |deserializedError| be the result of [=deserialize a serialized abort reason=] given null and |workerRealm|.
+                  1. [=fetch controller/Abort=] |preloadFetchController| with |deserializedError|.
+          1. Else if |timingInfo|'s [=service worker timing info/worker matched router source=] is not "{{RouterSourceEnum/fetch-event}}", a user agent may run the following substeps:
+
+              Note: A user agent may speculatively dispatch a network request in parallel with creating a fetch event in order to minimize the bootstrap cost.
+
+              1. Assert: [=service worker timing info/worker matched router source=] is null.
+              1. Let |autoPreloadFetchController| be null.
+              1. Set |responseForAutoPreload| to be a [=race response=] whose [=race response/value=] is "<code>pending</code>".
+              1. Run the following substeps [=in parallel=], but [=abort when=] |fetchController|'s [=fetch controller/state=] is "<code>terminated</code>" or "<code>aborted</code>":
+                  1. Set |autoPreloadFetchController| to the result of calling [=fetch=] given |request|, with [=fetch/processResponse=] set to the following steps given a [=/response=] |autoPreloadRequestResponse|:
+                  1. Set |responseForAutoPreload|'s [=race response/value=] to |autoPreloadRequestResponse|.

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