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 2f0768771154eb182565bffc583eecf06faaa5c6..06f7d14adf4974eb098090a91827360f78e7f65a 100644
--- a/talk/media/webrtc/webrtcvideoengine2.cc
+++ b/talk/media/webrtc/webrtcvideoengine2.cc
@@ -2229,6 +2229,7 @@ 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;
@@ -2612,6 +2613,7 @@ 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;