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stayed upon resizing the window.

Bug: b/112668689
Bug: 841886
Test: Created a PIP window and it had rounded corners. Rounded corners
Change-Id: Ie57223d8c5a2701a0013eee0bce2cf5333d2c304
Reviewed-on: https://chromium-review.googlesource.com/1219426
Commit-Queue: Eliot Courtney <edcourtney@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594962}