Introduce ServiceWorker.ActivatedWorkerPreparationForMainFrame.Time 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 "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;
+
 class ServiceWorkerMetrics {
  public:
   // Used for UMA. Append-only.
   enum ReadResponseResult {
     READ_OK,
     READ_HEADERS_ERROR,
     READ_DATA_ERROR,
     NUM_READ_RESPONSE_RESULT_TYPES,
   };
 
@@ skipping 125 matching lines @@
                                       EventType purpose,
                                       bool is_installed);
 
   // Records the time taken to successfully start a worker. |is_installed|
   // indicates whether the version has been installed.
   static void RecordStartWorkerTime(base::TimeDelta time,
                                     bool is_installed,
                                     StartSituation start_situation,
                                     EventType purpose);
 
+  // Records the time taken to prepare an activated Service Worker for a main
+  // frame fetch.
+  static void RecordActivatedWorkerPreparationTimeForMainFrame(
+      base::TimeDelta time,
+      EmbeddedWorkerStatus initial_worker_status,
+      StartSituation start_situation);
+
   // Records the result of trying to stop a worker.
   static void RecordWorkerStopped(StopStatus status);
 
   // Records the time taken to successfully stop a worker.
   static void RecordStopWorkerTime(base::TimeDelta time);
 
   static void RecordActivateEventStatus(ServiceWorkerStatusCode status,
                                         bool is_shutdown);
   static void RecordInstallEventStatus(ServiceWorkerStatusCode status);
 
@@ skipping 57 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_