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This CL adds a new Decode() interface in MjpegDecodeAccelerator to use
DMA buffer FD, size and offset as input, and enables it in VAAPI and
V4L2 implementations.

Bug: b:120057531
Test: jpeg_decode_accelerator_unittest
Test: media_unittests --gtest_filter=MojoMjpeg*
Change-Id: I5b53e599cb887d9e8fa8f85cd7f5d83ddfc3aa94
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730891
Commit-Queue: Ren-Pei Zeng <kamesan@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693014}