Implement googContentType GetStats metric reported on receive side.

webrtc/media/engine/webrtcvideoengine.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 2446 matching lines @@
   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.qp_sum = stats.qp_sum;
 
   info.interframe_delay_max_ms = stats.interframe_delay_max_ms;
 
+  info.content_type = stats.content_type;
+
   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;
 
   info.timing_frame_info = stream_->GetAndResetTimingFrameInfo();
 
   if (log_stats)
     LOG(LS_INFO) << stats.ToString(rtc::TimeMillis());
@@ skipping 172 matching lines @@
     stream.temporal_layer_thresholds_bps.resize(GetDefaultVp9TemporalLayers() -
                                                 1);
   }
 
   std::vector<webrtc::VideoStream> streams;
   streams.push_back(stream);
   return streams;
 }
 
 }  // namespace cricket