It is a step in the big refactoring to introduce new network emulation layer for peer connection level e2e test, which will be based on system sockets level injection. Bug: webrtc:10138 Change-Id: Ie3854d22aa3eec289617bc432026ea670646556a Reviewed-on: https://webrtc-review.googlesource.com/c/115943 Reviewed-by: Sebastian Jansson <srte@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26137}