service worker: Attribute purpose to start worker attempts for UMA

content/browser/service_worker/service_worker_handle_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 <vector>
+
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "content/browser/service_worker/embedded_worker_registry.h"
 #include "content/browser/service_worker/embedded_worker_test_helper.h"
 #include "content/browser/service_worker/service_worker_context_core.h"
 #include "content/browser/service_worker/service_worker_dispatcher_host.h"
 #include "content/browser/service_worker/service_worker_handle.h"
 #include "content/browser/service_worker/service_worker_registration.h"
 #include "content/browser/service_worker/service_worker_test_utils.h"
 #include "content/browser/service_worker/service_worker_version.h"
@@ skipping 120 matching lines @@
 };
 
 TEST_F(ServiceWorkerHandleTest, OnVersionStateChanged) {
   scoped_ptr<ServiceWorkerHandle> handle =
       ServiceWorkerHandle::Create(helper_->context()->AsWeakPtr(),
                                   provider_host_->AsWeakPtr(),
                                   version_.get());
 
   // Start the worker, and then...
   ServiceWorkerStatusCode status = SERVICE_WORKER_ERROR_FAILED;
-  version_->StartWorker(CreateReceiverOnCurrentThread(&status));
+  version_->StartWorker(ServiceWorkerMetrics::EventType::UNKNOWN,
+                        CreateReceiverOnCurrentThread(&status));
   base::RunLoop().RunUntilIdle();
   EXPECT_EQ(SERVICE_WORKER_OK, status);
 
   // ...update state to installing...
   version_->SetStatus(ServiceWorkerVersion::INSTALLING);
 
   // ...and update state to installed.
   version_->SetStatus(ServiceWorkerVersion::INSTALLED);
 
   ASSERT_EQ(3UL, ipc_sink()->message_count());
   ASSERT_EQ(0L, dispatcher_host_->bad_message_received_count_);
 
   // We should be sending 1. StartWorker,
   EXPECT_EQ(EmbeddedWorkerMsg_StartWorker::ID,
             ipc_sink()->GetMessageAt(0)->type());
   // 2. StateChanged (state == Installing),
   VerifyStateChangedMessage(handle->handle_id(),
                             blink::WebServiceWorkerStateInstalling,
                             ipc_sink()->GetMessageAt(1));
   // 3. StateChanged (state == Installed).
   VerifyStateChangedMessage(handle->handle_id(),
                             blink::WebServiceWorkerStateInstalled,
                             ipc_sink()->GetMessageAt(2));
 }
 
 }  // namespace content