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This reverts commit 0ea41733.

Reason for revert: In this CL, GetOverlayMailbox() calls BufferQueue::GetCurrentBuffer(). Unfortunately, it turns out there are cases where this causes the GPU to draw to a buffer that's being scanned out (see https://crbug.com/1047030 for an example). It may also cause problems with damage tracking. Reverting this CL to try to fix the issue before the M81 branch point :(

Original change's description:
> Viz/Ozone/DRM: Provide NativePixmap for the primary plane
> 
> Plumb mailbox for the primary plane to OverlayProcessorOzone and use
> SharedImageInterface to obtain the corresponding NativePixmap.
> 
> Bug: 756454
> Change-Id: Ic537d05253bc68c27a8fed961de8547ace359e82
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2016327
> Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
> Commit-Queue: Saman Sami <samans@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#736065}

TBR=rjkroege@chromium.org,samans@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 756454
Change-Id: I6f42b94d1939597f7c34f0d0433d45a02716aa58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031723Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Commit-Queue: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737238}