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

webrtc/video/video_stream_decoder.cc

Index: webrtc/video/video_stream_decoder.cc
diff --git a/webrtc/video/video_stream_decoder.cc b/webrtc/video/video_stream_decoder.cc
index 915eccf5bd43dfa7fec6b82589e6e419ab3966cc..009a18c8754789f59699c71fd542f0e37f1afe5e 100644
--- a/webrtc/video/video_stream_decoder.cc
+++ b/webrtc/video/video_stream_decoder.cc
@@ -122,7 +122,9 @@ void VideoStreamDecoder::OnFrameBufferTimingsUpdated(int decode_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);