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The contents of DesksBarView is put inside the ScrollView to support the
scrollable desks. And the customized BentoDesksBarLayout is used to
layout the contents.

The follow up work will include new style of new desk button, define
the minimum width of the mini view to make sure the desk's name can
always be seen, etc.

Bug: 1147245
Change-Id: Ic75f21d1b534723a551f3e56ab0edbfac4e07d4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566350Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Min Chen <minch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836219}