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This one is important to estimate health of secondary account sign-in.
This stats should also be used for estimation of secondary account
sign-in improvements.

BUG=1036943
BUG=b:/146792085
TEST=N/A

Change-Id: I80c2ec4886fcaad79cb1de07899c01e2a9f9b997
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1980897
Commit-Queue: Yury Khmel <khmel@chromium.org>
Auto-Submit: Yury Khmel <khmel@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Kush Sinha <sinhak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734099}