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This CL adds the corresponding Scenic commands for the received
gfx::OverlayTransform for Fuchsia. This allows us to flip or rotate
the overlay video content.

Bug: 1169182
Change-Id: I9a5689251f3a363cd88db0d9b0bcc1b550cf2133
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2644565
Commit-Queue: Emircan Uysaler <emircan@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846369}