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Discovered new bug regarding windows with top insets which affects both
minimized windows and unminimzed windows. The current patch does not
make it perfect in the case of windows with top insets (especially if
they are letterboxed), but its a lot closer than before.

Test: added test, manual
Bug: 1041555
Change-Id: I3503ca4a6760517176607c50d1dc6f1a2b9ca376
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2001753Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734137}