Track network stack error codes from UMA and UKM

components/ukm/ukm_reporting_service.cc

 // Copyright 2017 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.
 
 // ReportingService specialized to report UKM metrics.
 
 #include "components/ukm/ukm_reporting_service.h"
 
 #include "base/metrics/field_trial_params.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 74 matching lines @@
 
 void UkmReportingService::LogCellularConstraint(bool upload_canceled) {
   UMA_HISTOGRAM_BOOLEAN("UKM.LogUpload.Canceled.CellularConstraint",
                         upload_canceled);
 }
 
 void UkmReportingService::LogResponseCode(int response_code) {
   UMA_HISTOGRAM_SPARSE_SLOWLY("UKM.Upload.ResponseCode", response_code);
 }
 
+void UkmReportingService::LogErrorCode(int error_code) {
+  UMA_HISTOGRAM_SPARSE_SLOWLY("UKM.FailedUploadErrorCode", -error_code);
+}
+
 void UkmReportingService::LogSuccess(size_t log_size) {
   UMA_HISTOGRAM_COUNTS_10000("UKM.LogSize.OnSuccess", log_size / 1024);
 }
 
 void UkmReportingService::LogLargeRejection(size_t log_size) {}
 
 }  // namespace metrics