Google is pushing into a new world of smartphone hardware, with a new prototype phone that can create a 3D-map of a room. The prototype phone , a 5-inch device codenamed Project Tango, was revealed on Thursday. Its sensors can read a room by tracking the motion of the device itself and simultaneously mapping the environment around it with “a quarter million 3D measurements every second.” The company has added indoor maps to its mapping products before, but this project comes from the firm’s Advanced Technology and Projects group and takes that concept to an all-new level.