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Use the VAAPI frame mapper instead of the linear frame mapper (i.e.
mmap()) to read the correctly synced output frame of MJDA.

Bug: 991136, b:120057531
Test: jpeg_decode_accelerator_unittest
Change-Id: Ibf3bee74176fa879a800bcd893ab9f222e65ebbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1739306Reviewed-by: Ricky Liang <jcliang@chromium.org>
Commit-Queue: Ren-Pei Zeng <kamesan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684317}