service worker: Attribute purpose to start worker attempts for UMA

content/browser/service_worker/service_worker_registration.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_registration.h"
 
 #include <vector>
 
 #include "content/browser/service_worker/service_worker_context_core.h"
 #include "content/browser/service_worker/service_worker_info.h"
@@ skipping 269 matching lines @@
 
   // "8. Run the [[UpdateState]] algorithm passing registration.activeWorker and
   // "activating" as arguments."
   activating_version->SetStatus(ServiceWorkerVersion::ACTIVATING);
   // "9. Fire a simple event named controllerchange..."
   if (activating_version->skip_waiting())
     FOR_EACH_OBSERVER(Listener, listeners_, OnSkippedWaiting(this));
 
   // "10. Queue a task to fire an event named activate..."
   activating_version->RunAfterStartWorker(
+      ServiceWorkerMetrics::EventType::ACTIVATE,
       base::Bind(&ServiceWorkerRegistration::DispatchActivateEvent, this,
                  activating_version),
       base::Bind(&ServiceWorkerRegistration::OnActivateEventFinished, this,
                  activating_version));
 }
 
 void ServiceWorkerRegistration::DeleteVersion(
     const scoped_refptr<ServiceWorkerVersion>& version) {
   DCHECK_EQ(id(), version->registration_id());
 
@@ skipping 130 matching lines @@
   if (!context_) {
     callback.Run(SERVICE_WORKER_ERROR_ABORT);
     return;
   }
   context_->storage()->NotifyDoneInstallingRegistration(
       this, version.get(), status);
   callback.Run(status);
 }
 
 }  // namespace content