Cleans callers having to initialize TimeDeltas. Change-Id: Ib00a59bedf05fb82c9fde1d9fdd1e341e2132cb8 Bug: None Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/256360 Reviewed-by: Philip Eliasson <philipel@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Commit-Queue: Evan Shrubsole <eshr@webrtc.org> Cr-Commit-Position: refs/heads/main@{#36292}