GitLab

This is a reland of a7fc60bd

Original change's description:
> Add three UMA metrics for bookmarks addition.
> 
> First metric collects stats on bookmark addition
> sliced on profile. Second and third metric collects stats
> on the count of open tabs during bookmark all tabs, for
> regular and incognito users.
> 
> Bug: 966747, 1006145
> Change-Id: I29add57c472cf5344951b4a91be465872db45485
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1793184
> Commit-Queue: Rohit Agarwal <roagarwal@chromium.org>
> Reviewed-by: Peter Boström <pbos@chromium.org>
> Reviewed-by: Mark Pearson <mpearson@chromium.org>
> Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
> Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#699859}

Bug: 966747, 1006145
Change-Id: I656d44090fdba00ca794006dd82700c375ea704d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1823855
Commit-Queue: Rohit Agarwal <roagarwal@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701088}