Here ion Maryland they have a catch-all that could have been used. They charge you for not paying full time and attention to your driving.
They use it once in a while when people are seen eating their hamburgers or eating ice cream while driving.
I believe in this case it not only was legal ,but is good. No one should be reading Google while driving.
no one should text or read texts while driving.
phones are another thing. I can chew gum and walk....and I can drive and talk. I do it with passengers, and to me it is no more a distraction to drive and talk on the phone. Hands free is better still.