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

webrtc/logging/rtc_event_log/rtc_event_log2text.cc

 /*
  *  Copyright (c) 2017 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 446 matching lines @@
       std::cout << parsed_stream.GetTimestamp(i) << "\tRTP"
                 << StreamInfo(direction, media_type)
                 << "\tssrc=" << parsed_header.ssrc
                 << "\ttimestamp=" << parsed_header.timestamp;
       if (parsed_header.extension.hasAbsoluteSendTime) {
         std::cout << "\tAbsSendTime="
                   << parsed_header.extension.absoluteSendTime;
       }
       if (parsed_header.extension.hasVideoContentType) {
         std::cout << "\tContentType="
-                  << static_cast<int>(parsed_header.extension.videoContentType);
+                  << static_cast<uint8_t>(

[sprang_webrtc, 2017/07/26 14:13:42]

This is probably not what you want; I think it will be printed as single char
with the ascii value of videoContentType...

[ilnik, 2017/07/26 14:49:48]

Yep, fixed.

+                         parsed_header.extension.videoContentType);
       }
       if (parsed_header.extension.hasVideoRotation) {
         std::cout << "\tRotation="
                   << static_cast<int>(parsed_header.extension.videoRotation);
       }
       if (parsed_header.extension.hasTransportSequenceNumber) {
         std::cout << "\tTransportSeq="
                   << parsed_header.extension.transportSequenceNumber;
       }
       if (parsed_header.extension.hasTransmissionTimeOffset) {
@@ skipping 51 matching lines @@
                             direction);
             break;
           default:
             break;
         }
       }
     }
   }
   return 0;
 }