service worker: Attribute purpose to start worker attempts for UMA

content/browser/notifications/notification_event_dispatcher_impl.cc

Index: content/browser/notifications/notification_event_dispatcher_impl.cc
diff --git a/content/browser/notifications/notification_event_dispatcher_impl.cc b/content/browser/notifications/notification_event_dispatcher_impl.cc
index ca125fa584f72a2b69200f8bb06381d684351903..15d9a111170b8d11c8b051257a68d79cb6576625 100644
--- a/content/browser/notifications/notification_event_dispatcher_impl.cc
+++ b/content/browser/notifications/notification_event_dispatcher_impl.cc
@@ -232,7 +232,7 @@ void DoDispatchNotificationClickEvent(
           &DispatchNotificationClickEventOnWorker,
           make_scoped_refptr(service_worker_registration->active_version()),
           notification_database_data, action_index, status_callback),
-      status_callback);
+      status_callback, ServiceWorkerMetrics::EventType::NOTIFICATION_CLICK);
 }
 
 // -----------------------------------------------------------------------------
@@ -303,7 +303,8 @@ void DoDispatchNotificationCloseEvent(
             &DispatchNotificationCloseEventOnWorker,
             make_scoped_refptr(service_worker_registration->active_version()),
             notification_database_data, dispatch_event_callback),
-        dispatch_event_callback);
+        dispatch_event_callback,
+        ServiceWorkerMetrics::EventType::NOTIFICATION_CLOSE);
   } else {
     dispatch_event_callback.Run(ServiceWorkerStatusCode::SERVICE_WORKER_OK);
   }