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This CL makes sure video track disabled by video background track
optimization is re-enabled when entering Picture-in-Picture.

Bug: 949265
Change-Id: Id0cca141f262537672f49f8cdc8bc6db5c10e3dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1556837Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721018}