Add codec name to CodecSpecificInfo and get the codec name stats from there instead.

webrtc/modules/video_coding/include/video_codec_interface.h

Index: webrtc/modules/video_coding/include/video_codec_interface.h
diff --git a/webrtc/modules/video_coding/include/video_codec_interface.h b/webrtc/modules/video_coding/include/video_codec_interface.h
index 19303c0d6783ed47cdd07a7f7461ca059bc59e69..f0a11e7a532316356a2f52bcf4d98f40d376ed84 100644
--- a/webrtc/modules/video_coding/include/video_codec_interface.h
+++ b/webrtc/modules/video_coding/include/video_codec_interface.h
@@ -90,7 +90,9 @@ union CodecSpecificInfoUnion {
 // must be fitted with a copy-constructor. This is because it is copied
 // in the copy-constructor of VCMEncodedFrame.
 struct CodecSpecificInfo {
+  CodecSpecificInfo() : codecType(kVideoCodecUnknown), codec_name(nullptr) {}
   VideoCodecType codecType;
+  const char* codec_name;
   CodecSpecificInfoUnion codecSpecific;
 };