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This adds support code for collecting user behavior metrics for the
legacy TLS deprecation UI.

Bug: 1016105
Change-Id: Ia8ebde562fbd882055b285866d6351c4d30860c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872296
Commit-Queue: Christopher Thompson <cthomp@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708099}