This demonstrates the Unity 4 bug as described here: http://forum.unity3d.com/threads/art-runtime-support.223802/
To reproduce, install ArtCrash.apk on any Android device where the runtime has been switched to ART (Developer options -> Select runtime -> Use ART).
This has been verified on a Nexus 5 as well as the Google Tango tablet. On a Nexus 5, it typically crashes after 500 frames (~9 seconds).