Add name of histogram with mismatched params.

Bug: 836238
Change-Id: Ibec5500a6d9348a30009d3d6d97a51c38a8e64ef
Reviewed-on: https://chromium-review.googlesource.com/1026051Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553207}

tools/metrics/histograms/enums.xml

@@ -22260,6 +22260,7 @@ Called by update_gpu_driver_bug_workaround_entries.py.-->
       label="DataUse.MessageSize.AllServices.Downstream.Unknown.NotCellular"/>
   <int value="-1607339868"
       label="DataUse.MessageSize.AllServices.Upstream.Unknown.NotCellular"/>
+  <int value="-1561887015" label="MediaRouter.Cast.Channel.Error"/>
   <int value="-1459119846"
       label="ServiceWorkerCache.Cache.Scheduler.QueueLength"/>
   <int value="-1390672863"