This is a reland of 76d3e7a8d1539483a8465d6502cc8259e74ccebf
I have run the WPT tests and ensured they are now passing with this
change. I have changed the following,
- The old CL was assuming that ToI420 frames had type I420, but they
could be I420A which was causing a crash.
- I fixed a copy-paste error in the offset of the V stride.
Original change's description:
> NV12 support for VP8 simulcast
>
> Tested using video_loopback with generated NV12 frames.
>
> Bug: webrtc:11635, webrtc:11975
> Change-Id: I14b2d663c55a83d80e48e226fcf706cb18903193
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/186722
> Commit-Queue: Evan Shrubsole <eshr@google.com>
> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#32325}
Bug: webrtc:11635
Bug: webrtc:11975
Change-Id: Ifa790af97cd7ab30c6cb4648ebd140abc1593b0b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/187490
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Evan Shrubsole <eshr@google.com>
Cr-Commit-Position: refs/heads/master@{#32381}
602b13ac87