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This patch adds a histogram that records whether a site (via autofill):

  1. collects phone number
  2. uses autocomplete="one-time-code"
  3. uses WebOTP

Design doc: https://docs.google.com/document/d/1OPqPNY9l76kvaBPBCS5wbBQv2HNhmNlsDAcUvmYgyNI/edit#heading=h.kua94pd3af6v

Bug: 1107590
Change-Id: Id1d4daf33cb26c43987bcf49dea1f737e7528ead
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2332893
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Sam Goto <goto@chromium.org>
Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798405}