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As a followup, the dimension "os" need to be updated once crbug.com/966238 is done

Bug: 966616
Change-Id: Ic2da344c93b7f5b656a5002f514cb88a96262659
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637603Reviewed-by: Simon Hatch <simonhatch@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665719}