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Video overlays on the Cast platform follow a special path handled by the
hardware via a separate API. The Cast overlay strategy was updated in
3737028e to accept the overlay rather
than relying on the Ozone platform to make the decision.

The logging was moved in OverlayStrategyUnderlayCast and
VideoPlaneController.

Bug: None
Test: Compiled cast_shell
Change-Id: Ide14380ad626d7bcd9ba00cb7f74daab292f2f80
Reviewed-on: https://chromium-review.googlesource.com/1134495Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577607}