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Now FuchsiaVideoDecoder uses sysmem to allocate output buffers instead
of creating raw VMOs. The sysmem collection is shared with the GPU
where it's passed to Vulkan. This means that decoded frames are now
passed from mediacodec to Vulkan directly, without being touched by
the renderer or the GPU process.

Bug: 981026
Change-Id: I7dc8b48ceb0621966034e554897efd542af63a6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752918Reviewed-by: enne <enne@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689065}