service worker: Attribute purpose to start worker attempts for UMA

content/browser/push_messaging/push_messaging_router.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/push_messaging/push_messaging_router.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "content/browser/service_worker/service_worker_context_wrapper.h"
@@ skipping 73 matching lines @@
   }
 
   ServiceWorkerVersion* version = service_worker_registration->active_version();
   DCHECK(version);
 
   // Hold on to the service worker registration in the callback to keep it
   // alive until the callback dies. Otherwise the registration could be
   // released when this method returns - before the event is delivered to the
   // service worker.
   version->RunAfterStartWorker(
+      ServiceWorkerMetrics::EventType::PUSH,
       base::Bind(&PushMessagingRouter::DeliverMessageToWorker,
                  make_scoped_refptr(version), service_worker_registration,
                  payload, deliver_message_callback),
       base::Bind(&PushMessagingRouter::DeliverMessageEnd,
                  deliver_message_callback, service_worker_registration));
 }
 
 // static
 void PushMessagingRouter::DeliverMessageToWorker(
     const scoped_refptr<ServiceWorkerVersion>& service_worker,
@@ skipping 48 matching lines @@
     case SERVICE_WORKER_ERROR_MAX_VALUE:
       NOTREACHED() << "Got unexpected error code: " << service_worker_status
                    << " " << ServiceWorkerStatusToString(service_worker_status);
       delivery_status = PUSH_DELIVERY_STATUS_SERVICE_WORKER_ERROR;
       break;
   }
   RunDeliverCallback(deliver_message_callback, delivery_status);
 }
 
 }  // namespace content