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This Cl adds autofill metrics based on the security level. The
goal is to see whether the security level impacts the CTR of
autofill suggestions or the card save rate.

Bug: 853347
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I75ce8c6b924d7fd90e80e518af46509bb6bccde2
Reviewed-on: https://chromium-review.googlesource.com/1103218
Commit-Queue: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Christopher Thompson <cthomp@chromium.org>
Reviewed-by: Tao Bai <michaelbai@chromium.org>
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569136}