Wire up H264 fmtp sprop-parameter-sets with H264SpsPpsTracker.

webrtc/video/video_receive_stream.cc

Index: webrtc/video/video_receive_stream.cc
diff --git a/webrtc/video/video_receive_stream.cc b/webrtc/video/video_receive_stream.cc
index 0d3365810cc4c52462b65b47d7148a1f31aa992b..183f72b537fcf9e6f75afb6bfebe44eaf648275a 100644
--- a/webrtc/video/video_receive_stream.cc
+++ b/webrtc/video/video_receive_stream.cc
@@ -315,7 +315,8 @@ void VideoReceiveStream::Start() {
   for (const Decoder& decoder : config_.decoders) {
     video_receiver_.RegisterExternalDecoder(decoder.decoder,
                                             decoder.payload_type);
-
+    // TODO(johan): make Decoder.codec_params accessible for RtpStreamReceiver
+    // which holds H264SpsPpsTracker
     VideoCodec codec = CreateDecoderVideoCodec(decoder);
     RTC_CHECK(rtp_stream_receiver_.AddReceiveCodec(codec));
     RTC_CHECK_EQ(VCM_OK, video_receiver_.RegisterReceiveCodec(