afef4bfd1c66b427aae531d8db98d5fb43390c0c

"Adding a test framework for conference mode application in VoE." was wrongly committed and therefore was temporarily reverted. This is to reland. The CL is indifferent from its original version https://review.webrtc.org/46249004/ TBR=phoglund@webrtc.org BUG= Review URL: https://webrtc-codereview.appspot.com/50109005 Cr-Commit-Position: refs/heads/master@{#9290}
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