Google's Android Sensor Hub knows how your Nexus is moving
 

In addition to its new Nexus 5X and 6P handsets, Google also revealed a low-power secondary processor during its September 29th event. This added chip resides in both models. It's called the Android Sensor Hub and acts to monitor the device's movem...

http://www.engadget.com/2015/09/29/g...id-sensor-hub/