NetworkLinkRtcpObserver is similar to RtcpBandwidthObserver but pass time variables using unit types instead of raw integers. Bug: webrtc:13757 Change-Id: Iaa0bbe0b108620b3a24013c40e7d9004032e904d Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/305022 Reviewed-by: Jakob Ivarsson <jakobi@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40087}