Wire up currently-received video codec to stats.

BUG=webrtc:1844, webrtc:4808
R=mflodman@webrtc.org, pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1315413002

Cr-Original-Commit-Position: refs/heads/master@{#9810}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: f42376c60111edba6f29060bf3dd79e75d8dbb97
diff --git a/video_receive_stream.h b/video_receive_stream.h
index e613006..955d875 100644
--- a/video_receive_stream.h
+++ b/video_receive_stream.h
@@ -75,6 +75,8 @@
     int min_playout_delay_ms = 0;
     int render_delay_ms = 10;
 
+    int current_payload_type = -1;
+
     int total_bitrate_bps = 0;
     int discarded_packets = 0;