ServiceWorker: Add UMA for Activate and Install event results.

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 "base/macros.h"
 #include "content/browser/service_worker/service_worker_database.h"
 
@@ skipping 44 matching lines @@
   // Records the result of trying to start a worker. |is_installed| indicates
   // whether the version has been installed.
   static void RecordStartWorkerStatus(ServiceWorkerStatusCode status,
                                       bool is_installed);
 
   // Records the time taken to successfully start a worker. |is_installed|
   // indicates whether the version has been installed.
   static void RecordStartWorkerTime(const base::TimeDelta& time,
                                     bool is_installed);
 
+  static void RecordActivateEventStatus(ServiceWorkerStatusCode status);
+  static void RecordInstallEventStatus(ServiceWorkerStatusCode status);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ServiceWorkerMetrics);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_METRICS_H_