service worker: Attribute purpose to start worker attempts for UMA

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 <stddef.h>
 
 #include "base/macros.h"
@@ skipping 58 matching lines @@
     DETACH_BY_REGISTRY,
     TIMEOUT,
     // Add new types here.
     NUM_TYPES
   };
 
   // Used for UMA. Append-only.
   enum class EventType {
     ACTIVATE,
     INSTALL,
-    FETCH,
+    FETCH,  // Deprecated, use a more specific FETCH_ type.
     SYNC,
     NOTIFICATION_CLICK,
     PUSH,
     GEOFENCING,
     SERVICE_PORT_CONNECT,
     MESSAGE,
     NOTIFICATION_CLOSE,
+    FETCH_MAIN_FRAME,
+    FETCH_SUB_FRAME,
+    FETCH_SHARED_WORKER,
+    FETCH_SUB_RESOURCE,
+    UNKNOWN,  // Used when event type is not known.
     // Add new events to record here.
-
     NUM_TYPES
   };
 
   // Used for UMA. Append only.
   enum class Site { OTHER, NEW_TAB_PAGE, NUM_TYPES };
 
   // Converts an event type to a string. Used for tracing.
   static const char* EventTypeToString(EventType event_type);
 
   // Excludes NTP scope from UMA for now as it tends to dominate the stats and
@@ skipping 16 matching lines @@
   // Used for ServiceWorkerStorage.
   static void RecordPurgeResourceResult(int net_error);
   static void RecordDeleteAndStartOverResult(DeleteAndStartOverResult result);
 
   // Counts the number of page loads controlled by a Service Worker.
   static void CountControlledPageLoad(const GURL& url);
 
   // Records the result of trying to start a worker. |is_installed| indicates
   // whether the version has been installed.
   static void RecordStartWorkerStatus(ServiceWorkerStatusCode status,
+                                      EventType purpose,
                                       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);
 
   // Records the result of trying to stop a worker.
   static void RecordWorkerStopped(StopStatus status);
 
@@ skipping 40 matching lines @@
   // previous event ended).
   static void RecordTimeBetweenEvents(const base::TimeDelta& time);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ServiceWorkerMetrics);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_METRICS_H_