GitLab

crrev.com/c/2429236 records SMS receive time and success time. This
patch adds metrics to record the time from the API is called to the time
a user clicks "Deny" to terminate the verification flow.

There's an existing metric called "TimeCancel" which is from the origin
trial. After the trial we changed the backend. Since then it no longer
record "user" cancellation time.

crrev.com/c/2428825 introduced a new catergory "user cancel" and this
patch records the timing of such behavior.

UKM collection review:
https://docs.google.com/document/d/15orQiLx06QSuZr4ShBaozY0dvPzXiTWwJZ9Xk5cgzAA/edit?usp=sharing

Bug: 1127402
Change-Id: I1314bf8e3efb4f2817132bc0ef629124b4b10d69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2502950Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822786}