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This CL adds media Feature of controlling the availability of the
VAAPI HW AV1 decoder. The feature is enabled by default. Thanks
to this, we can disable the HW AV1 decoder by finch.

Bug: 1029212
Test: None
Change-Id: Ib9b6abb1322262ddaa489647c7dae0bcb1f9d515
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399939
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826622}