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This is a reland of 77acb015b6ba886da3e7adb9c2106cf873fa8497 Original change's description: > Introduce ability to test echo in PC level test framework > > Bug: webrtc:10138 > Change-Id: Ie638eaec5a46e37dc0eb52e9432fdebd0e4a1c4d > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/147866 > Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> > Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> > Reviewed-by: Sam Zackrisson <saza@webrtc.org> > Commit-Queue: Artem Titov <titovartem@webrtc.org> > Cr-Commit-Position: refs/heads/master@{#28892} Bug: webrtc:10138 Change-Id: I0358239500ffadbdbae8090bf39535386fbfd40c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/149805 Commit-Queue: Artem Titov <titovartem@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Sam Zackrisson <saza@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28917}