Re: [w3c/ServiceWorker] Ensure the addRoutes() to be called within the install event (PR #1744)

@youennf commented on this pull request.



> -        1. Set |serviceWorker|'s [=service worker/list of router rules=] to |routerRules|.
-        1. Return [=a promise resolved with=] undefined.
+            1. If |rule|["{{RouterRule/source}}"] is "{{RouterSourceEnum/fetch-event}}" and |serviceWorker|'s [=set of event types to handle=] does not [=set/contain=] {{ServiceWorkerGlobalScope/fetch!!event}}, return [=a promise rejected with=] a {{TypeError}}.
+        1. Let |lifetimePromise| be a new [=promise=].
+        1. [=ExtendableEvent/Add lifetime promise=] |lifetimePromise| to |event|.
+
+            Note: {{InstallEvent/addRoutes(rules)|event.addRoutes(rules)}} extends the lifetime of the event by default as if {{ExtendableEvent/waitUntil()|event.waitUntil(promise)}} is called.
+
+        1. Let |promise| be a new [=promise=].
+        1. [=In parallel=]:
+            1. Upon [=upon fulfillment|fulfillment=] or [=upon rejection|rejection=] of |promise|, resolve |lifetimePromise| with undefined.
+
+                Note: this step is for making |lifetimePromise| always fullfilled to avoid the install event failure.
+
+        1. Let |serviceWorkerEventLoop| be the [=current global object=]'s [=event loop=].
+        1. [=Queue a task=] to run the following steps on |serviceWorkerEventLoop| using the [=DOM manipulation task source=]:

If using the parallel queue, you need to queue a task on the service worker event loop to resolve the promise. We are not expected to resolve promises from a parallel queue. 

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