What is RCS API Manager.java on my android

[AC Question]

I have logs in my phone that show the below... I am not tech savy so I am not sure if this is spyware?

2016-10-16 10:03:24.346 RCS_Service_API [DEBUG] com.android.mms.rcs.ComposeMessageFileTransferReceiver.onReceive() Line:64 (ComposeMessageFileTransferReceiver.java)->messageId =nullstart =-1;end =-1;total =-1
2016-10-16 10:03:28.425 RCS_Service_API [DEBUG] com.android.mms.rcs.ComposeMessageFileTransferReceiver.onReceive() Line:64 (ComposeMessageFileTransferReceiver.java)->messageId =nullstart =-1;end =-1;total =-1
2016-10-16 10:04:50.959