Track network stack error codes from UMA and UKM

components/ukm/ukm_reporting_service.cc

Index: components/ukm/ukm_reporting_service.cc
diff --git a/components/ukm/ukm_reporting_service.cc b/components/ukm/ukm_reporting_service.cc
index 2802b1362ab302907424248c4d1bafc11237db31..be8affbc0cb728ff4c6d71962143fb3ab8f7d7de 100644
--- a/components/ukm/ukm_reporting_service.cc
+++ b/components/ukm/ukm_reporting_service.cc
@@ -92,6 +92,10 @@ 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);
 }