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This PR makes sure the last video frame stays visible in the PiP window
when video ends. This is what <video> elements currently do inline.

Bug: 910433
Change-Id: Id6a2065146ca4c76828f3257cd3ee2af7c2eed1b
Reviewed-on: https://chromium-review.googlesource.com/c/1356707Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613343}