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The present CL is similar to [1]. The rationale in the commit message of
[1] does not apply to the current plan for multi-display split view, but
similar code changes seem reasonable anyway.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/1726310

Bug: 970013
Change-Id: I1a1572d89c2d25ac60b9ac25dc37edce7b74fce8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1856890
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706009}