Previously there is only two method of getting your domain ownership verification at google webmaster. The website owner can get verified either by uploading HTML file or by META TAG. There is a few changes in google webmaster since this year google webmaster now added new features to verify with DNS record.
The method of DNS verification helps to easy the verification method who feels tedious of uploading HTML file and adding meta tag. For more information about the DNS verification and its procedural you can see google webmaster blog