Update ServiceWorker event handled status histogram

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 49 matching lines @@
   // 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);
 
   // Records the ratio of unhandled events to the all events fired during
   // the lifetime of ServiceWorker.
-  static void RecordEventStatus(size_t fired_events, size_t handled_events);
+  static void RecordPerWorkerEventHandledStatus(size_t fired_events,
+                                                size_t handled_events);
+
+  // Records if each ServiceWorker event is handled or not.
+  static void RecordEventHandledStatus(bool handled);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ServiceWorkerMetrics);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_METRICS_H_