Re: [w3c/ServiceWorker] Skip executing fetch handlers if it is no-op. (PR #1672)

@yoshisatoyanagisawa commented on this pull request.



>            1. Run the <a>responsible event loop</a> specified by |settingsObject| until it is destroyed.
           1. [=map/Clear=] |workerGlobalScope|'s [=map of active timers=].
       1. Wait for |serviceWorker| to be [=running=], or for |startFailed| to be true.
       1. If |startFailed| is true, then return *failure*.
       1. Return |serviceWorker|'s [=start status=].
   </section>
 
+  <section algorithm>
+    <h3 id="empty-handler-identification-algorithm"><dfn>Empty Handler identification</dfn></h3>
+
+      : Input
+      :: |workerGlobalScope|, a [=service worker/global object=].
+      : Output
+      :: a boolean
+
+      1. If |workerGlobalScope|'s <a>set of event types to handle</a> does not [=set/contain=] <code>fetch</code>, then returns false.
+      1. set |eventListenerList| to [=map/value=] whose [=map/key=] is <code>fetch</code> in |workerGlobalScope|'s <a>set of event types to handle</a>.
+      1. [=list/For each=] |eventListener| of |eventListenerList|:
+          1. If |eventListener|'s [=callback=] is not null:
+              1. Set |callback| to an ECMAScript object coverted from |eventListener|'s [=callback=], which is [=idl-callback-interface=].

done.

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