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The output buffer of ImageProcessor is created by minigbm. The
minigbm's buffer alignment can be different from the encoder's
one. It is necessary to execute S_FMT with the buffer allocated
by minigbm.

Bug: 1033799
Test: appr.tc on kukui
Test: vea_test on kukui
Change-Id: I45659393c84a1bb629afa895349d9c438251810f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2104572
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754825}