Track network stack error codes from UMA and UKM

components/metrics/net/net_metrics_log_uploader.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 "components/metrics/net/net_metrics_log_uploader.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "components/data_use_measurement/core/data_use_user_data.h"
 #include "components/metrics/metrics_log_uploader.h"
 #include "net/base/load_flags.h"
@@ skipping 84 matching lines @@
 
 }  // namespace
 
 namespace metrics {
 
 NetMetricsLogUploader::NetMetricsLogUploader(
     net::URLRequestContextGetter* request_context_getter,
     base::StringPiece server_url,
     base::StringPiece mime_type,
     MetricsLogUploader::MetricServiceType service_type,
-    const base::Callback<void(int)>& on_upload_complete)
+    const MetricsLogUploader::UploadCallback& on_upload_complete)
     : request_context_getter_(request_context_getter),
       server_url_(server_url),
       mime_type_(mime_type.data(), mime_type.size()),
       service_type_(service_type),
       on_upload_complete_(on_upload_complete) {}
 
 NetMetricsLogUploader::~NetMetricsLogUploader() {
 }
 
 void NetMetricsLogUploader::UploadLog(const std::string& compressed_log_data,
@@ skipping 32 matching lines @@
 
 void NetMetricsLogUploader::OnURLFetchComplete(const net::URLFetcher* source) {
   // We're not allowed to re-use the existing |URLFetcher|s, so free them here.
   // Note however that |source| is aliased to the fetcher, so we should be
   // careful not to delete it too early.
   DCHECK_EQ(current_fetch_.get(), source);
 
   int response_code = source->GetResponseCode();
   if (response_code == net::URLFetcher::RESPONSE_CODE_INVALID)
     response_code = -1;
+  int error_code = 0;
+  const net::URLRequestStatus& request_status = source->GetStatus();
+  if (request_status.status() != net::URLRequestStatus::SUCCESS) {
+    error_code = request_status.error();
+  }
   current_fetch_.reset();
-  on_upload_complete_.Run(response_code);
+  on_upload_complete_.Run(response_code, error_code);
 }
 
 }  // namespace metrics