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This makes sure clicking the native Picture-in-Picture button (after
entering Picture-in-Picture) exits Picture-in-Picture and that video
controls are reflected when entering and exiting Picture-in-Picture.

Screenshot: https://i.imgur.com/081Xbmb.png

Bug: 840516, 806249
Change-Id: I410a4a06cc4eea62dae8e1d368e4d05394f13c86
Reviewed-on: https://chromium-review.googlesource.com/1084833
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: apacible <apacible@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564807}