Track network stack error codes from UMA and UKM

components/metrics/metrics_log_uploader.h

Index: components/metrics/metrics_log_uploader.h
diff --git a/components/metrics/metrics_log_uploader.h b/components/metrics/metrics_log_uploader.h
index 55e6d5aaa451c883b60bbc82e97906ebcfce8b0f..3fe7f5e3f5cdf8be9c487068f03f17725afe3dff 100644
--- a/components/metrics/metrics_log_uploader.h
+++ b/components/metrics/metrics_log_uploader.h
@@ -17,6 +17,10 @@ namespace metrics {
 // of MetricsService.
 class MetricsLogUploader {
  public:
+  // Type for OnUploadComplete callbacks.  These callbacks will receive two
+  // parameters: A response code and an net error code.
+  typedef base::Callback<void(int, int)> UploadCallback;
+
   // Possible service types. This should correspond to a type from
   // DataUseUserData.
   enum MetricServiceType {