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According to UI review deck, the Picture-in-Picture icon should live at
the very bottom of the list in the overflow menu.

Test page: https://beaufortfrancois.github.io/sandbox/media/overflow-video.html
Screenshots: https://imgur.com/a/lnH1e

Bug: 726621
Change-Id: Id0075ec3524842200eacc315539233a494edc484
Reviewed-on: https://chromium-review.googlesource.com/916381Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536697}