[Webkit-unassigned] [Bug 282227] [WebCodec] Test incorrectly assumes that no frame returned should be an error

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=282227

--- Comment #1 from Jean-Yves Avenard [:jya] <jean-yves.avenard at apple.com> ---
The file ./LayoutTests/imported/w3c/web-platform-tests/webcodecs/vp8.webm contains such alternative reference frame

http://blog.webmproject.org/2010/05/inside-webm-technology-vp8-alternate.html
```
VP8 uses three types of reference frames for inter prediction: the last frame, a "golden" frame (one frame worth of decompressed data from the arbitrarily distant past) and an alternate reference frame. Overall, this design has a much smaller memory footprint on both encoders and decoders than designs with many more reference frames. In video compression, it is very rare for more than three reference frames to provide significant quality benefit, but the undesirable increase in memory footprint from the extra frames is substantial.
Unlike other types of reference frames used in video compression, which are displayed to the user by the decoder, the VP8 alternate reference frame is decoded normally but is never shown to the user. 
```

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