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These histograms can be compared to "AsyncDNS.Rcode" to determine
whether there is an unusual distribution of rcodes relative to normal
DNS lookups (i.e. A/AAAA lookups). I'm interested in particular to see
what rcodes map to DNS_SERVER_FAILED (besides ServFail).

Bug: 506227
Change-Id: I5bbdc6c52ef7b017f0d38c1329f450ed346f6e4a
Reviewed-on: https://chromium-review.googlesource.com/1152972
Commit-Queue: Rob Percival <robpercival@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581419}