Get VideoCapturer stats via VideoTrackSourceInterface in StatsCollector,

webrtc/media/base/mediachannel.h

 /*
  *  Copyright (c) 2004 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 638 matching lines @@
   // Estimated capture start time in NTP time in ms.
   int64_t capture_start_ntp_time_ms;
 };
 
 struct VideoSenderInfo : public MediaSenderInfo {
   VideoSenderInfo()
       : packets_cached(0),
         firs_rcvd(0),
         plis_rcvd(0),
         nacks_rcvd(0),
-        input_frame_width(0),
-        input_frame_height(0),
         send_frame_width(0),
         send_frame_height(0),
         framerate_input(0),
         framerate_sent(0),
         nominal_bitrate(0),
         preferred_bitrate(0),
         adapt_reason(0),
         adapt_changes(0),
         avg_encode_ms(0),
         encode_usage_percent(0) {
   }
 
   std::vector<SsrcGroup> ssrc_groups;
   std::string encoder_implementation_name;
   int packets_cached;
   int firs_rcvd;
   int plis_rcvd;
   int nacks_rcvd;
-  int input_frame_width;
-  int input_frame_height;
   int send_frame_width;
   int send_frame_height;
   int framerate_input;
   int framerate_sent;
   int nominal_bitrate;
   int preferred_bitrate;
   int adapt_reason;
   int adapt_changes;
   int avg_encode_ms;
   int encode_usage_percent;
@@ skipping 424 matching lines @@
   // Signal when the media channel is ready to send the stream. Arguments are:
   //     writable(bool)
   sigslot::signal1<bool> SignalReadyToSend;
   // Signal for notifying that the remote side has closed the DataChannel.
   sigslot::signal1<uint32_t> SignalStreamClosedRemotely;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_MEDIACHANNEL_H_