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When a split view window is reinserted to overview, it shall go to the
correct position to maintain the MRU ordering of the overview grid.

Fixed: 1038396
Change-Id: I4cac7963610eb6a4b7022d2bc0e983e1f587a8cc
Bug: 1038396
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1984723Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728314}