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This CL enables DMA-buf encoding on VAAPI JEA to optimize the
performance and reduce the CPU consumption.

Bug: 944705, b/123057886
Test: Manually
Test: ./jpeg_encode_accelerator_unittest

Change-Id: I05d80c8bb649b0c09ad26d3545377c77e3d385bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1532135
Commit-Queue: Wei Lee <wtlee@chromium.org>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: Sheng-hao Tsao <shenghao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662964}