This prepares for adding a logged event for route changes.
Bug: webrtc:10614
Change-Id: Iee989e029530c991da38697a30e0a585316d9a05
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/135951
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27915}