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 47 matching lines @@
     REQUEST_JOB_ERROR_STREAM_ABORTED,
     REQUEST_JOB_ERROR_KILLED,
     REQUEST_JOB_ERROR_KILLED_WITH_BLOB,
     REQUEST_JOB_ERROR_KILLED_WITH_STREAM,
     REQUEST_JOB_ERROR_DESTROYED,
     REQUEST_JOB_ERROR_DESTROYED_WITH_BLOB,
     REQUEST_JOB_ERROR_DESTROYED_WITH_STREAM,
     NUM_REQUEST_JOB_RESULT_TYPES,
   };
 
+  enum EventType {
+    EVENT_TYPE_FETCH,
+    // Add new event to record here.
+    EVENT_TYPE_MAX,

[falken, 2015/06/25 09:31:39]

the histogram people encouraged us to use NUM_EVENT_TYPES instead of MAX

[kinuko, 2015/07/02 14:27:26]

Done.

+  };
+
   // Used for ServiceWorkerDiskCache.
   static void CountInitDiskCacheResult(bool result);
   static void CountReadResponseResult(ReadResponseResult result);
   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);
   static void RecordDestroyDatabaseResult(ServiceWorkerDatabase::Status status);
@@ skipping 13 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(const GURL& scope,
+                                                EventType event,
+                                                size_t handled_events,
+                                                size_t fired_events);
+
+  // Records if each ServiceWorker event is handled or not.
+  static void RecordEventHandledStatus(const GURL& scope,
+                                       EventType event,
+                                       bool handled);
 
   // Records result of a ServiceWorkerURLRequestJob that was forwarded to
   // the service worker.
   static void RecordURLRequestJobResult(bool is_main_resource,
                                         URLRequestJobResult result);
 
   // Records the result of dispatching a fetch event to a service worker.
   static void RecordFetchEventStatus(bool is_main_resource,
                                      ServiceWorkerStatusCode status);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ServiceWorkerMetrics);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_METRICS_H_