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This change allows the kOnDemand option to apply for MediaStreams, meaning
that we can switch over to using Surfaces when it is needed for PiP, deferring
to a VideoLayer in the normal non-PiP case.

Bug: 889857
Change-Id: I56019885d24e9d36f74a279d31f8259081edd1d3
Reviewed-on: https://chromium-review.googlesource.com/c/1271591Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: François Beaufort <beaufort.francois@gmail.com>
Commit-Queue: CJ DiMeglio <lethalantidote@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601738}