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Prior to this change, VTVDA activated the most recently seen sequence
and picture parameter sets (SPS and PPS) at IDR slices.

With this change it will use the SPS and PPS indicated by the IDR slice
header.

Bug: 988555
Change-Id: Id197545558529abc30fb64c9e638baf0b57f29c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1838688Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704319}