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When decoding a jpeg the generated surface is reused when the video frame size
doesn't change. When encoding a jpeg a new surface is created every time. This
change enables reusing of surfaces for jpeg encoding.

This also fixes a bug that causes the jpeg_encode_accelerator_unittest to always
fail in debug, because surfaces are not properly destroyed before creating new
ones.

TEST=JPEG encode tests on nocturne

BUG=905502

Change-Id: I9a6b0b5703813e518a3e82687b289e94745e1c62
Reviewed-on: https://chromium-review.googlesource.com/c/1337130
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Pawel Osciak <posciak@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608683}