Add decoder-specific settings with proper lifetime.

webrtc/video_receive_stream.h

Index: webrtc/video_receive_stream.h
diff --git a/webrtc/video_receive_stream.h b/webrtc/video_receive_stream.h
index 410d5aff7f62adcec88ab455b79de43cd9b64303..49466ffcbd6c412727022618868c2b6f753234ab 100644
--- a/webrtc/video_receive_stream.h
+++ b/webrtc/video_receive_stream.h
@@ -43,6 +43,8 @@ class VideoReceiveStream {
     // Name of the decoded payload (such as VP8). Maps back to the depacketizer
     // used to unpack incoming packets.
     std::string payload_name;
+
+    DecoderSpecificSettings decoder_specific;
   };
 
   struct Stats {