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It's possible to get to this state by scrolling a bit, then rotating a
couple times. Not entirely reproducible (depends on num windows and how
much scrolling and display size), but added a test case which repros
100% without this fix.

Test: Added test
Bug: 1013224
Change-Id: I15a4bcdcda83ccac4346727342108b0c295fd151
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1853130
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706155}