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I made a few mistakes at the last moment in the initial
implementation. 1.) CHECK the validness of ref_frame_map is
wrong in keyframe case. 2.) slice_data_offset in
VASliceParameterBufferAV1 is not filled.  This CL fixes them.

Bug: b:172214398
Test: video_decode_accelerator_tests on volteer
Change-Id: I24e9fada30dd56fe10a51fb3e5d8c448ee996666
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2542940
Auto-Submit: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Sreerenj Balachandran <sreerenj.balachandran@intel.com>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828508}