ServiceWorker: Add UMA to measure execution times of oninstall/onfetch

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 "base/time/time.h"
 #include "content/browser/service_worker/service_worker_database.h"
 
 namespace content {
 
 class ServiceWorkerMetrics {
  public:
   enum ReadResponseResult {
     READ_OK,
     READ_HEADERS_ERROR,
     READ_DATA_ERROR,
@@ skipping 13 matching lines @@
   static void CountWriteResponseResult(WriteResponseResult result);
 
   // Used for ServiceWorkerDatabase.
   static void CountOpenDatabaseResult(ServiceWorkerDatabase::Status status);
   static void CountReadDatabaseResult(ServiceWorkerDatabase::Status status);
   static void CountWriteDatabaseResult(ServiceWorkerDatabase::Status status);
 
   // Counts the number of page loads controlled by a Service Worker.
   static void CountControlledPageLoad();
 
+  // Measure the execution time of onfetch/oninstall event
+  static void MeasureFetchEventExecutionTime(base::TimeDelta delta);
+  static void MeasureRegistrationTime(base::TimeDelta delta);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ServiceWorkerMetrics);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_METRICS_H_