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This change adds the ability to take metadata provided by websites
via the MediaSession API and give it to the System Media Transport
Controls (SMTC), giving users more information about the active media
session on Windows.

Bug: 954009
Change-Id: I637fce4208a5a78138cbdc1bcb93a954b698b7d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1606900
Commit-Queue: Austin Orion <auorion@microsoft.com>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664099}