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Relands https://crrev.com/c/2016327 but avoids calling
BufferQueue::GetCurrentBuffer() in GLOutputSurfaceBufferQueue due to
issues with empty swaps.

Plumb mailbox for the primary plane to OverlayProcessorOzone and use
SharedImageInterface to obtain the corresponding NativePixmap.

Bug: 756454,1047030
Change-Id: I78466b2225b2d4402b853f9f7cbade485144b18f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036430
Commit-Queue: Saman Sami <samans@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738325}