Piggybacking simulcast id and ALR experiment id into video content type extension.

webrtc/common_types.cc

 /*
  *  Copyright (c) 2012 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 36 matching lines @@
       hasAbsoluteSendTime(false),
       absoluteSendTime(0),
       hasTransportSequenceNumber(false),
       transportSequenceNumber(0),
       hasAudioLevel(false),
       voiceActivity(false),
       audioLevel(0),
       hasVideoRotation(false),
       videoRotation(kVideoRotation_0),
       hasVideoContentType(false),
-      videoContentType(VideoContentType::UNSPECIFIED),
+      videoContentType(VideoContentType::Unspecified()),
       has_video_timing(false) {}
 
 RTPHeader::RTPHeader()
     : markerBit(false),
       payloadType(0),
       sequenceNumber(0),
       timestamp(0),
       ssrc(0),
       numCSRCs(0),
       arrOfCSRCs(),
@@ skipping 191 matching lines @@
   oss << " ]";
   return oss.str();
 }
 
 std::ostream& BitrateAllocation::operator<<(std::ostream& os) const {
   os << ToString();
   return os;
 }
 
 }  // namespace webrtc