7f6a6fc0b23795cd4f0aacbf707618c1f3d0a878

Handling the case when encoder drops only the higher layer. Added options to screenshare loopback test to discard high temporal or spatial layers (to view the lower layers). Review URL: https://codereview.webrtc.org/1287643002 Cr-Commit-Position: refs/heads/master@{#9883}
Revert of Excluding two troublesome trybots from the CQ config. (patchset #1 id:1 of https://codereview.webrtc.org/1310953006/ )
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