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This change enables interactive window cycle list, introducing new ways
to interact with alt-tab.

Fixed: 1067327
Change-Id: Ia93463d86134e22952ade8bc74b10cb4bc55ee66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441257
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812724}