minyuel 22c2729607 Adding unittests to AudioConferenceMixer.
Unit tests around AudioConferenceMixer was severely missing. This CL is to add some tests.

BUG=
R=ajm@chromium.org, andrew@webrtc.org

Review URL: https://codereview.webrtc.org/1257583011 .

Cr-Commit-Position: refs/heads/master@{#9825}
2015-09-01 07:33:37 +00:00
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