Report interframe delay sum in old GetStats

webrtc/media/engine/webrtcvideoengine.cc

Index: webrtc/media/engine/webrtcvideoengine.cc
diff --git a/webrtc/media/engine/webrtcvideoengine.cc b/webrtc/media/engine/webrtcvideoengine.cc
index 428353d7935c0120847b068f9a72ffeaddc322ec..55de5ae335b622fdd46167da24526e1721f81100 100644
--- a/webrtc/media/engine/webrtcvideoengine.cc
+++ b/webrtc/media/engine/webrtcvideoengine.cc
@@ -2477,6 +2477,8 @@ WebRtcVideoChannel::WebRtcVideoReceiveStream::GetVideoReceiverInfo(
   info.frames_rendered = stats.frames_rendered;
   info.qp_sum = stats.qp_sum;
 
+  info.interframe_delay_sum_ms = stats.interframe_delay_sum_ms;
+
   info.codec_name = GetCodecNameFromPayloadType(stats.current_payload_type);
 
   info.firs_sent = stats.rtcp_packet_type_counts.fir_packets;