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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: I2dae82657d4d92876c834c78dd62d53830fbe6cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865264
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707036}