Add screenshare perf tests with lossy links

BUG=

Review URL: https://codereview.webrtc.org/1409513005

Cr-Original-Commit-Position: refs/heads/master@{#10290}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 4af0f1a098bc908cfe825981b825687673d5134a
1 file changed