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

webrtc/video/video_stream_decoder.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 104 matching lines @@
                                                      int max_decode_ms,
                                                      int current_delay_ms,
                                                      int target_delay_ms,
                                                      int jitter_buffer_ms,
                                                      int min_playout_delay_ms,
                                                      int render_delay_ms) {}
 
 void VideoStreamDecoder::OnTimingFrameInfoUpdated(const TimingFrameInfo& info) {
 }
 
-void VideoStreamDecoder::OnCompleteFrame(bool is_keyframe, size_t size_bytes) {}
+void VideoStreamDecoder::OnCompleteFrame(bool is_keyframe,
+                                         size_t size_bytes,
+                                         VideoContentType content_type) {}
 
 void VideoStreamDecoder::OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms) {
   video_receiver_->SetReceiveChannelParameters(max_rtt_ms);
 
   rtc::CritScope lock(&crit_);
   last_rtt_ms_ = avg_rtt_ms;
 }
 }  // namespace webrtc