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This CL adds the new flag for the refactoring of the the TabStrip.

Bug: 1128251, 1128249.
Change-Id: I13a5b6fef21ef5bc414848fcb3ab4bbc3099c5e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410068
Commit-Queue: Nazerke Kalidolda <nazerke@google.com>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808840}