More test coverage for previously fixed bug
https://crbug.com/webrtc/369654168.
Two tests are added:
1. LibvpxVp9Encoder unit test that 4:2:1 720p can be reconfigured to
singlecast (which is what happens for encodings[0] in the bug).
2. Integration test that 4:2:1 720p can change to 180p,360p,540p.
This is the exact same test as was added in [1] but using
requested_resolution instead of scale_resolution_down_by.
[1] https://webrtc-review.googlesource.com/c/src/+/363941
Bug: webrtc:369654168
Change-Id: I83456b9254c1c6f647586d340d0fe5864b5515c6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/364200
Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Auto-Submit: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#43185}
1accaf91b5