By initialization, time since backoff is unlimited at startup.
Bug: none
Change-Id: I9693cd09b7201606374a8bf9a0a03e6ee83191d3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/232611
Commit-Queue: Fanny Linderborg <linderborg@webrtc.org>
Reviewed-by: Fanny Linderborg <linderborg@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35076}