Google users with Roku boxes may be pleased to learn that the streaming TV set-top now offers a Google Play Movies & TV app.Google Play Movies & TV is a competitor to Apple’s iTunes and Amazon Instant Video. It allows people to buy or rent online videos and stream them to Android gadgets, iPhones and iPads, and Google's Chromecast TV stick.Now Roku TV products have joined the fold, giving the service a stronger footing in the living room—a key area of interest for Google.