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This change hides the controls on the Picture-in-Picture window on all
platforms while moving the window or when the size updates. Previously,
this was handled on Windows.

The controls cannot be interacted with during the resize and dragging
actions. They also slightly obscure the video, especially the play/pause
icon. Removing the controls will allow the user to view the final video
size and position.

Bug: 877987
Change-Id: I788d8cb5690e3c587f93b21ad7eb7d0a2c69ecef
Reviewed-on: https://chromium-review.googlesource.com/1197722Reviewed-by: CJ DiMeglio <lethalantidote@chromium.org>
Commit-Queue: apacible <apacible@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587832}