[automerger skipped] Add one field (sampling_rate_denom) in NetworkDnsEventReported
am: 9768ae29d1 -s ours
am skip reason: change_id Ifd496f01ceaeb48de0361280c2315c3733c24f66 with SHA1 71b457e4e1 is in history

Change-Id: I814d56e4720a0da18f3096920d82886bcc5ff952