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The spec is at https://guidelines.googleplex.com/crosux-spec/feature-specs/shelf-tablet.html#shelf-tablet-home
(in-app shelf) but should only apply when the hotseat flag is on.

Bug: 1009367
Change-Id: If176d7f14a8573f06a5c37c0cb2b5ae95179a761
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832654
Auto-Submit: Manu Cornet <manucornet@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701402}