The front windshield is acoustically insulated glass. There is a thin sheet of acoustic laminate somewhere in the glass, though I don't know all the details on it. I have noticed it at certain angles on my car as a slight waviness (if that's a word). The Malibu and Equinox have this as well and looking at them in our showroom I can see the same thing on all three vehicles. My guess is that what you are seeing is normal but you might want to go by a dealership with your car and compare it to another one on the lot.
I just noticed this yesterday for the first time. I thought at first it was a reflection of the dash that might have be giving the illusion of the grainy view but it was not.
I suspect that it is in fact the laminate inside the glass. Hopefully I won't be fixated on it enough for it to bug me.