If you run the “launch” page (when you play from the Editor) on the Nexus 6 then you will get the un-concatenated source files which will be easier to debug.
Looks like we’re not printing the error message from vr_camera.js, you could try changing this line:
if (err) {
console.warn("Failed to initialize HMD");
return;
}
to print out err as well. Though I’m not sure it will tell us much.
On a side note, I got what I needed in terms of my AR project by deleting the input_hmd and vr_camera references, and just handling device orientation events myself.