ServiceWorker: Record result of purging stale resources

content/browser/service_worker/service_worker_metrics.cc

 // 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.
 
 #include "content/browser/service_worker/service_worker_metrics.h"
 
 #include "base/metrics/histogram_macros.h"
+#include "base/metrics/sparse_histogram.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/strings/string_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/common/content_client.h"
 
 namespace content {
 
 namespace {
@@ skipping 58 matching lines @@
   UMA_HISTOGRAM_ENUMERATION("ServiceWorker.Database.WriteResult",
                             status, ServiceWorkerDatabase::STATUS_ERROR_MAX);
 }
 
 void ServiceWorkerMetrics::RecordDestroyDatabaseResult(
     ServiceWorkerDatabase::Status status) {
   UMA_HISTOGRAM_ENUMERATION("ServiceWorker.Database.DestroyDatabaseResult",
                             status, ServiceWorkerDatabase::STATUS_ERROR_MAX);
 }
 
+void ServiceWorkerMetrics::RecordPurgeResourceResult(int net_error) {
+  UMA_HISTOGRAM_SPARSE_SLOWLY("ServiceWorker.Storage.PurgeResourceResult",
+                              std::abs(net_error));
+}
+
 void ServiceWorkerMetrics::RecordDiskCacheMigrationResult(
     DiskCacheMigrationResult result) {
   UMA_HISTOGRAM_ENUMERATION("ServiceWorker.Storage.DiskCacheMigrationResult",
                             result, NUM_MIGRATION_RESULT_TYPES);
 }
 
 void ServiceWorkerMetrics::RecordDeleteAndStartOverResult(
     DeleteAndStartOverResult result) {
   UMA_HISTOGRAM_ENUMERATION("ServiceWorker.Storage.DeleteAndStartOverResult",
                             result, NUM_DELETE_AND_START_OVER_RESULT_TYPES);
@@ skipping 112 matching lines @@
         "ServiceWorker.URLRequestJob.MainResource.StatusZeroError", error,
         blink::WebServiceWorkerResponseErrorLast + 1);
   } else {
     UMA_HISTOGRAM_ENUMERATION(
         "ServiceWorker.URLRequestJob.Subresource.StatusZeroError", error,
         blink::WebServiceWorkerResponseErrorLast + 1);
   }
 }
 
 }  // namespace content