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Clamshell mode behavior will remain the same, i.e., tapping on the
overview background will return to its previous state, it can either be
in-app or home screen.

Bug: 997885
Change-Id: I82624e44024e273a343c20e3707cb1d97e31d594
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864026Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706548}