Henrik Boström 7804c54b97 [Stats flake] Mark outbound-rtp.framesPerSecond as optional.
It has been reported that sometimes FPS is undefined, causing the test
to be flaky.

Bug: webrtc:11651
Change-Id: Ieea33833724defa46110aad5d103aa16bfbea861
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176516
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31481}
2020-06-10 09:29:00 +00:00
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