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Reland "[Video Tutorials] Add internal tutorial group."

This is a reland of a96793a7

Original change's description:
> [Video Tutorials] Add internal tutorial group.
>
> Bug: 1115755
> Change-Id: I481a8f6498188681216d13df32ee41436cd1306c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358056
> Reviewed-by: David Trainor <dtrainor@chromium.org>
> Commit-Queue: Hesen Zhang <hesen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#800642}

Bug: 1115755
Change-Id: I0960fef750bba2e37fc0d36574376e9c4de44c7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2372883
Commit-Queue: Hesen Zhang <hesen@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801868}