GitLab

Adds a banner to the top of the privacy sandbox page.

Bug: 1152336
Change-Id: Ia44f468945fc1a36529185ae82a80aac465246b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593372Reviewed-by: Rainhard Findling <rainhard@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Rainhard Findling <rainhard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837509}