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This happens for mirrors because we only scale by x for both x and y
dimensions, so some windows (ones with insets) that don't scale the same
way on the two axes end up having a transparent zone underneath.

Also, for WindowPreviewView the view is shifted after the above is fixed.
It's because the top inset is used in calculations, but is already taken
care of in WindowMirrorView.

Test: manual
Bug: 962893
Change-Id: Idd2e4676be10de0306aefc7fb112db3a01d9bf1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1647138
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666593}