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VABuffers are created for each bitstream in AV1Decoding. This CL
applies the buffer reuse optimization (b/166646505) to av1
decoding though buffers for slice data are not reused due to
b/177028692.

Bug: b:166646505,b:175897723
Test: video.DecodeAccelVD.av1* video.DecodeCompliance.av1_test_vectors
Test: video.Play.av1_hw* video.Seek.av1* video.MemSeek.av1*
Change-Id: Id70b49bf3dd49d098b559286d0f01c2fe3a11ad7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615727Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Commit-Queue: Andres Calderon Jaramillo <andrescj@chromium.org>
Auto-Submit: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843617}