Update ServiceWorker event handled status histogram

content/browser/service_worker/service_worker_metrics.h

Index: content/browser/service_worker/service_worker_metrics.h
diff --git a/content/browser/service_worker/service_worker_metrics.h b/content/browser/service_worker/service_worker_metrics.h
index 400cd7eb7d46e5be81d6d77d3dd77815cb63aab5..a12542905f6ad3720c5f9f4124e4a4aa0aa46c66 100644
--- a/content/browser/service_worker/service_worker_metrics.h
+++ b/content/browser/service_worker/service_worker_metrics.h
@@ -67,7 +67,11 @@ class ServiceWorkerMetrics {
 
   // 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);