Encoder API accepts non-integer frame rate since https://webrtc-review.googlesource.com/c/src/+/131949. Bug: webrtc:10812 Change-Id: I5fc9c5dfac4b182b84a735218a2946a95cc2b93c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/143483 Reviewed-by: Seth Hampson <shampson@webrtc.org> Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Commit-Queue: Sergey Silkin <ssilkin@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28548}