Sync the proto stats.proto from dns_resolver.proto
(Need to match as aosp/968223) Bug: 119862317 Test: ./out/host/linux-x86/bin/statsd_testdrive 116 Merged-In: I13a40327754600aa57aba41cc9d487f7c9bb036e Merged-In: I7fb3011c206016c3e7b7aab50b03903c0ae894db (cherry picked from commit dc20156c) Change-Id: Iedae482dafa61d6c3401b12f5414855b0633e439
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