Introduce ServiceWorker.EventDispatchingDelay UMA

content/browser/service_worker/service_worker_metrics.h

 // 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_METRICS_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_METRICS_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
+#include "base/time/time.h"
 #include "content/browser/service_worker/service_worker_database.h"
 #include "content/common/service_worker/service_worker_types.h"
 #include "third_party/WebKit/public/platform/modules/serviceworker/WebServiceWorkerResponseError.h"
 
 class GURL;
 
 namespace content {
 
 enum class EmbeddedWorkerStatus;
 
@@ skipping 197 matching lines @@
                                             bool frame_fetch_event_fired);
 
   // Records how often a dispatched event times out.
   static void RecordEventTimeout(EventType event);
 
   // Records the amount of time spent handling an event.
   static void RecordEventDuration(EventType event,
                                   base::TimeDelta time,
                                   bool was_handled);
 
+  // Records the time taken between sending an event IPC from the browser
+  // process to a Service Worker and executing the event handler in the Service
+  // Worker.
+  static void RecordEventDispatchingDelay(EventType event,
+                                          base::TimeDelta time,
+                                          Site site_for_metrics);
+
   // Records the result of dispatching a fetch event to a service worker.
   static void RecordFetchEventStatus(bool is_main_resource,
                                      ServiceWorkerStatusCode status);
 
   // Records result of a ServiceWorkerURLRequestJob that was forwarded to
   // the service worker.
   static void RecordURLRequestJobResult(bool is_main_resource,
                                         URLRequestJobResult result);
 
   // Records the error code provided when the renderer returns a response with
@@ skipping 33 matching lines @@
   static void RecordStartStatusAfterFailure(int failure_count,
                                             ServiceWorkerStatusCode status);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ServiceWorkerMetrics);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_METRICS_H_