ServiceWorker: Store the existence of fetch event handler

content/renderer/service_worker/service_worker_context_client.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/service_worker/service_worker_context_client.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/lazy_instance.h"
@@ skipping 478 matching lines @@
     int request_id,
     blink::WebServiceWorkerEventResult result) {
   Send(new ServiceWorkerHostMsg_ExtendableMessageEventFinished(
       GetRoutingID(), request_id, result));
 }
 
 void ServiceWorkerContextClient::didHandleInstallEvent(
     int request_id,
     blink::WebServiceWorkerEventResult result) {
   Send(new ServiceWorkerHostMsg_InstallEventFinished(
-      GetRoutingID(), request_id, result));
+      GetRoutingID(), request_id, result, proxy_->hasFetchEventHandler()));
 }
 
 void ServiceWorkerContextClient::didHandleFetchEvent(int request_id) {
   Send(new ServiceWorkerHostMsg_FetchEventFinished(
       GetRoutingID(), request_id,
       SERVICE_WORKER_FETCH_EVENT_RESULT_FALLBACK,
       ServiceWorkerResponse()));
 }
 
 void ServiceWorkerContextClient::didHandleFetchEvent(
@@ skipping 503 matching lines @@
 }
 
 base::WeakPtr<ServiceWorkerContextClient>
 ServiceWorkerContextClient::GetWeakPtr() {
   DCHECK(worker_task_runner_->RunsTasksOnCurrentThread());
   DCHECK(context_);
   return context_->weak_factory.GetWeakPtr();
 }
 
 }  // namespace content