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Currently, there is only a PiP button for the legacy / non-modern
set of media controls. This adds and enables the modern version.

BUG: 726619 823109
Change-Id: Iddb2d8393d5cf519bb6e32639d5f640bc341fc6f
Reviewed-on: https://chromium-review.googlesource.com/966980
Commit-Queue: apacible <apacible@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548358}