Add an entry in histograms.xml for WebRtcEventLogging.NetError

Bug: None
Change-Id: I4a9274b4c53b0925d2a51b610313fbaf4613ad2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1570173Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Elad Alon <eladalon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652832}

tools/metrics/histograms/histograms.xml

@@ -140961,6 +140961,17 @@ should be kept until we use this API.  -->
   </summary>
 </histogram>
 
+<histogram name="WebRtcEventLogging.NetError" expires_after="2019-12-31">
+  <owner>eladalon@chromium.org</owner>
+  <owner>saeedj@google.com</owner>
+  <owner>manj@google.com</owner>
+  <owner>dmitriyg@google.com</owner>
+  <summary>
+    NetError returned by the SimpleURLLoader object in charge of uploading a
+    WebRTC event log file.
+  </summary>
+</histogram>
+
 <histogram name="WebRtcEventLogging.Upload" enum="WebRtcEventLoggingUploadEnum"
     expires_after="2019-12-31">
   <owner>eladalon@chromium.org</owner>