Google VR Services Emulator for non Android N to get working Daydream Development Kit
Watch it in action on youtube:
According to official guide Nexus 6P is the only phone supported as a headset phone for a Daydream development kit at this time.
Please watch Designing & Developing for the Daydream Controller - Google I/O 2016
Google VR Services was not available prior to version N of Android.
This project adds the package com.google.vr.vrcore to fill the gap between SDK and controller.