Use tri-state enum for the existence of Fetch Handler in ServiceWorkerVersion.

content/browser/service_worker/service_worker_version_unittest.cc

 // Copyright 2014 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_version.h"
 
 #include <stdint.h>
 #include <tuple>
 
 #include "base/macros.h"
@@ skipping 205 matching lines @@
         helper_->context()->AsWeakPtr());
     version_ = new ServiceWorkerVersion(
         registration_.get(),
         GURL("http://www.example.com/test/service_worker.js"),
         helper_->context()->storage()->NewVersionId(),
         helper_->context()->AsWeakPtr());
     std::vector<ServiceWorkerDatabase::ResourceRecord> records;
     records.push_back(
         ServiceWorkerDatabase::ResourceRecord(10, version_->script_url(), 100));
     version_->script_cache_map()->SetResources(records);
+    version_->set_has_fetch_handler(true);
 
     // Make the registration findable via storage functions.
     ServiceWorkerStatusCode status = SERVICE_WORKER_ERROR_FAILED;
     helper_->context()->storage()->StoreRegistration(
         registration_.get(),
         version_.get(),
         CreateReceiverOnCurrentThread(&status));
     base::RunLoop().RunUntilIdle();
     ASSERT_EQ(SERVICE_WORKER_OK, status);
 
@@ skipping 1481 matching lines @@
   histogram_tester_.ExpectTotalCount(kLinkMouseDown, 1);
   histogram_tester_.ExpectTotalCount(kLinkTapDown, 0);
   EXPECT_EQ(SERVICE_WORKER_OK, status);
   StopWorker();
   // The UMA for kLinkMouseDown must be recorded when the worker stopped.
   histogram_tester_.ExpectTotalCount(kLinkMouseDown, 1);
   histogram_tester_.ExpectTotalCount(kLinkTapDown, 1);
 }
 
 }  // namespace content