A friend and I made a bet..

A friend and I made a bet at the start of the year that Zac wouldn't get a skin this year (2015), if Zac did get a new skin, my friend would buy me a legendary skin, and if Zac didn't get a skin, I would buy my friend a legendary skin. With the release of the new Chroma's (Which we had no idea would be available in the future.) We've found the need to re-evaluate our bet, he would like to not count the Chroma's in, and I would like to do the opposite. With that being said, are Chroma's considered skins? And if they are, should we count those as part of the bet?