Unit tests are updated to test that screen share is not adapted but it does not change the VideoSinkWants in WebRtcVideoEngine2::SendStream due to a switch to screen share. The reason is that it works anyway and sprang is looking into how to do adaptation based on frame rate as well and use the adapter for screen share as well. BUG=webrtc:5688, webrtc:5426 R=nisse@webrtc.org, pbos@webrtc.org, sprang@google.com Review URL: https://codereview.webrtc.org/1836043004 . Cr-Commit-Position: refs/heads/master@{#12240}