RTCMediaStreamTrackStats.framesDecoded collected.

webrtc/api/rtcstatscollector.cc

Index: webrtc/api/rtcstatscollector.cc
diff --git a/webrtc/api/rtcstatscollector.cc b/webrtc/api/rtcstatscollector.cc
index 216a5ac29916869530c9674659fbd135678fc0e4..12e81d95e6ecae83bec0e2c78e9d8eb5e4da80f7 100644
--- a/webrtc/api/rtcstatscollector.cc
+++ b/webrtc/api/rtcstatscollector.cc
@@ -436,6 +436,11 @@ ProduceMediaStreamTrackStatsFromVideoReceiverInfo(
     video_track_stats->frame_height = static_cast<uint32_t>(
         video_receiver_info.frame_height);
   }
+  // TODO(hbos): When we support receiving simulcast, this should be the total
+  // number of frames correctly decoded, independent of which SSRC it was
+  // received from. Since we don't support that, this is correct and is the same
+  // value as "RTCInboundRTPStreamStats.framesDecoded". crbug.com/659137
+  video_track_stats->frames_decoded = video_receiver_info.frames_decoded;
   return video_track_stats;
 }