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No existing ChromeOS arm device supports non 8 bit stream
decoding. VaapiVideoDecodeAccelerator implementation doesn't
support non 8 bit stream decoding. We have relied on underlying
implementations (e.g. drivers and firmware) to filter non 8 bit
streams. AcceleratedVideoDecoder has a getter function for the
bit depth of an input stream. This CL filters out non 8
bit streams in chrome by calling the getter function.

Bug: b:174798524
Test: video_decode_accelerator_tests test-25fps.vp9_2 on scarlet and atlas
Change-Id: I9071649740cd0ddab889887f09cabf598d38ec09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576298
Auto-Submit: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836028}