service worker: Attribute purpose to start worker attempts for UMA

content/browser/service_worker/service_worker_job_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 <stdint.h>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
@@ skipping 625 matching lines @@
   GURL script_url("http://www.example.com/service_worker.js");
   scoped_refptr<ServiceWorkerRegistration> registration =
       RunRegisterJob(GURL("http://www.example.com/"), script_url);
   ASSERT_TRUE(registration.get());
 
   // Manually create the waiting worker since there is no way to become a
   // waiting worker until Update is implemented.
   scoped_refptr<ServiceWorkerVersion> version = new ServiceWorkerVersion(
       registration.get(), script_url, 1L, helper_->context()->AsWeakPtr());
   ServiceWorkerStatusCode status = SERVICE_WORKER_ERROR_FAILED;
-  version->StartWorker(CreateReceiverOnCurrentThread(&status));
+  version->StartWorker(ServiceWorkerMetrics::EventType::UNKNOWN,
+                       CreateReceiverOnCurrentThread(&status));
   base::RunLoop().RunUntilIdle();
   ASSERT_EQ(SERVICE_WORKER_OK, status);
 
   version->SetStatus(ServiceWorkerVersion::INSTALLED);
   registration->SetWaitingVersion(version);
   EXPECT_EQ(ServiceWorkerVersion::RUNNING,
             version->running_status());
   EXPECT_EQ(ServiceWorkerVersion::INSTALLED, version->status());
 
   RunUnregisterJob(GURL("http://www.example.com/"));
@@ skipping 756 matching lines @@
 
   void set_install_callback(const base::Closure& callback) {
     install_callback_ = callback;
   }
   void set_install_event_result(blink::WebServiceWorkerEventResult result) {
     install_event_result_ = result;
   }
   void set_activate_event_result(blink::WebServiceWorkerEventResult result) {
     activate_event_result_ = result;
   }
-private:
+
+ private:
   base::Closure install_callback_;
   blink::WebServiceWorkerEventResult install_event_result_;
   blink::WebServiceWorkerEventResult activate_event_result_;
 };
 
 TEST_F(ServiceWorkerJobTest, RemoveControlleeDuringInstall) {
   EventCallbackHelper* helper = new EventCallbackHelper;
   helper_.reset(helper);
 
   GURL pattern("http://www.example.com/one/");
@@ skipping 133 matching lines @@
     ASSERT_TRUE(start_msg);
     EmbeddedWorkerMsg_StartWorker::Param param;
     EmbeddedWorkerMsg_StartWorker::Read(start_msg, &param);
     EmbeddedWorkerMsg_StartWorker_Params start_params = base::get<0>(param);
     EXPECT_TRUE(start_params.pause_after_download);
     sink->ClearMessages();
   }
 }
 
 }  // namespace content