RTCMediaStreamTrackStats.framesDropped collected by RTCStatsCollector.

webrtc/media/engine/webrtcvideoengine2.cc

 /*
  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 2368 matching lines @@
   info.decode_ms = stats.decode_ms;
   info.max_decode_ms = stats.max_decode_ms;
   info.current_delay_ms = stats.current_delay_ms;
   info.target_delay_ms = stats.target_delay_ms;
   info.jitter_buffer_ms = stats.jitter_buffer_ms;
   info.min_playout_delay_ms = stats.min_playout_delay_ms;
   info.render_delay_ms = stats.render_delay_ms;
   info.frames_received = stats.frame_counts.key_frames +
                          stats.frame_counts.delta_frames;
   info.frames_decoded = stats.frames_decoded;
+  info.frames_rendered = stats.frames_rendered;
 
   info.codec_name = GetCodecNameFromPayloadType(stats.current_payload_type);
 
   info.firs_sent = stats.rtcp_packet_type_counts.fir_packets;
   info.plis_sent = stats.rtcp_packet_type_counts.pli_packets;
   info.nacks_sent = stats.rtcp_packet_type_counts.nack_packets;
 
   if (log_stats)
     LOG(LS_INFO) << stats.ToString(rtc::TimeMillis());
 
@@ skipping 113 matching lines @@
         rtx_mapping[video_codecs[i].codec.id] !=
             ulpfec_config.red_payload_type) {
       video_codecs[i].rtx_payload_type = rtx_mapping[video_codecs[i].codec.id];
     }
   }
 
   return video_codecs;
 }
 
 }  // namespace cricket