Expose codec implementation names in stats.

talk/media/webrtc/webrtcvideoengine2.cc

Index: talk/media/webrtc/webrtcvideoengine2.cc
diff --git a/talk/media/webrtc/webrtcvideoengine2.cc b/talk/media/webrtc/webrtcvideoengine2.cc
index 5ee0119dcf259b925b54037958b472456666e0ec..e586a5dda2f2f94ec402bdd3eaac6bdb84d2a9e3 100644
--- a/talk/media/webrtc/webrtcvideoengine2.cc
+++ b/talk/media/webrtc/webrtcvideoengine2.cc
@@ -2212,6 +2212,7 @@ WebRtcVideoChannel2::WebRtcVideoSendStream::GetVideoSenderInfo() {
       }
     }
   }
+  info.encoder_implementation_name = stats.encoder_implementation_name;
   info.ssrc_groups = ssrc_groups_;
   info.framerate_input = stats.input_frame_rate;
   info.framerate_sent = stats.encode_frame_rate;
@@ -2581,6 +2582,7 @@ WebRtcVideoChannel2::WebRtcVideoReceiveStream::GetVideoReceiverInfo() {
   info.ssrc_groups = ssrc_groups_;
   info.add_ssrc(config_.rtp.remote_ssrc);
   webrtc::VideoReceiveStream::Stats stats = stream_->GetStats();
+  info.decoder_implementation_name = stats.decoder_implementation_name;
   info.bytes_rcvd = stats.rtp_stats.transmitted.payload_bytes +
                     stats.rtp_stats.transmitted.header_bytes +
                     stats.rtp_stats.transmitted.padding_bytes;