Show the fetch handler existence in chrome://serviceworker-internals

content/browser/service_worker/service_worker_storage.cc

 // Copyright 2013 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/browser/service_worker/service_worker_storage.h"
 
 #include <stddef.h>
 
 #include "base/bind_helpers.h"
 #include "base/files/file_util.h"
@@ skipping 1050 matching lines @@
         info.waiting_version = version->GetInfo();
       infos.push_back(info);
       continue;
     }
 
     if (registration_data.is_active) {
       info.active_version.status = ServiceWorkerVersion::ACTIVATED;
       info.active_version.script_url = registration_data.script;
       info.active_version.version_id = registration_data.version_id;
       info.active_version.registration_id = registration_data.registration_id;
+      info.active_version.fetch_handler_existence =
+          registration_data.has_fetch_handler
+              ? ServiceWorkerVersion::FetchHandlerExistence::EXISTS
+              : ServiceWorkerVersion::FetchHandlerExistence::DOES_NOT_EXIST;
     } else {
       info.waiting_version.status = ServiceWorkerVersion::INSTALLED;
       info.waiting_version.script_url = registration_data.script;
       info.waiting_version.version_id = registration_data.version_id;
       info.waiting_version.registration_id = registration_data.registration_id;
+      info.waiting_version.fetch_handler_existence =
+          registration_data.has_fetch_handler
+              ? ServiceWorkerVersion::FetchHandlerExistence::EXISTS
+              : ServiceWorkerVersion::FetchHandlerExistence::DOES_NOT_EXIST;
     }
     infos.push_back(info);
   }
 
   // Add unstored registrations that are being installed.
   for (const auto& registration : installing_registrations_) {
     if ((!origin_filter.is_valid() ||
          registration.second->pattern().GetOrigin() == origin_filter) &&
         pushed_registrations.insert(registration.first).second) {
       infos.push_back(registration.second->GetInfo());
@@ skipping 691 matching lines @@
     callback.Run(SERVICE_WORKER_ERROR_FAILED);
     return;
   }
   DVLOG(1) << "Deleted ServiceWorkerDiskCache successfully.";
   ServiceWorkerMetrics::RecordDeleteAndStartOverResult(
       ServiceWorkerMetrics::DELETE_OK);
   callback.Run(SERVICE_WORKER_OK);
 }
 
 }  // namespace content