IPhone 5s :: Google Using Motion Detection Without Permission

Simple: If Google Maps is using my motion activity to send me messages using their app, then why doesn't the app appear in Privacy/Motion Activity?Â

Last week I was using Google Maps on my iPhone 5S for voice navigation through Seattle during rush hour. I took a turn too sharply and my phone rolled off it's spot on my dash and it fell to the floor mat in my car. When safe, I picked it up and there was an alert-style message that said something along the lines of "We notice that you shook your phone while using Google Maps. Let us know if you are having difficulty using this app."Â

I subsequently checked Privacy/Motion Activity and Google was not listed as requesting information about my phone's motion.