A simple copy of the old mixer to a new directory. I also plan to run 'git cl format'. In another C…

webrtc/modules/audio_mixer/source/time_scheduler.cc

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 82 matching lines @@
     int64_t tickNow = rtc::TimeNanos();
     int64_t ticksSinceLastUpdate = tickNow - _lastPeriodMark;
     const int64_t millisecondsSinceLastUpdate =
       ticksSinceLastUpdate / rtc::kNumNanosecsPerMillisec;
 
     updateTimeInMS = _periodicityInMs - millisecondsSinceLastUpdate;
     updateTimeInMS =  (updateTimeInMS < 0) ? 0 : updateTimeInMS;
     return 0;
 }
 }  // namespace webrtc