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This fixes SurfaceLayer kOnDemand mode to work with
webmediaplayer_ms when the player starts in PIP.

Previously, the player wouldn't use SurfaceLayer, since it would
wait to enter PIP.  Now, it checks if the client is already in PIP,
and switches to SurfaceLayer immediately in kOnDemand mode.

Bug: 891619
Change-Id: I669003b512152cc22c3e0d1f7d69133304669108
Reviewed-on: https://chromium-review.googlesource.com/c/1301958Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603577}