Add histogram stats for AV sync stream offset:

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 51d842616b467ff83da460aa46d1e8d60fbc8f59..b37417782e9f61d639a9f160fd4807b680766a61 100644
--- a/webrtc/video_receive_stream.h
+++ b/webrtc/video_receive_stream.h
@@ -11,6 +11,8 @@
 #ifndef WEBRTC_VIDEO_RECEIVE_STREAM_H_
 #define WEBRTC_VIDEO_RECEIVE_STREAM_H_
 
+#include <limits.h>
+
 #include <map>
 #include <string>
 #include <vector>
@@ -66,6 +68,8 @@ class VideoReceiveStream : public ReceiveStream {
     int total_bitrate_bps = 0;
     int discarded_packets = 0;
 
+    int sync_offset_ms = INT_MIN;

[stefan-webrtc, 2016/03/09 15:59:30]

std::numeric_limits<int>::max()

[åsapersson, 2016/03/10 09:08:35]

Done.

[stefan-webrtc, 2016/03/10 14:25:09]

Or min if you wanted that. I didn't see it was MIN before.

+
     uint32_t ssrc = 0;
     std::string c_name;
     StreamDataCounters rtp_stats;