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Minimized and non minimized windows have their rounded corners applied
in overview differently, minimized on the mirror view layer, and normal
windows on the actual window layer. Due to the setup of the current
logic, minimized windows do not reset the windows layer rounded corners
on exit.

This was problematic if the window was not minimized when entering, and
then minimized at exit which is a common workflow in tablet mode.

Bug: 1146240
Test: added tests
Change-Id: I9b3f9c465bb1bdfc5bf1acbe727ea9743472edcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2542605Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828045}