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This CL decouples JPEG decoding and surface-to-image conversion in
VaapiJpegDecoder interface. Caller can obtain the decoded VA surface
from decoder, and get a VA image zero or multiple times.

Bug: b:120057531
Test: Pass jpeg_decode_accelerator_unittest.
Change-Id: I8bde2ec508394b05cf8058432efdb1b598535bf9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1609751
Commit-Queue: Ren-Pei Zeng <kamesan@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660761}