GvrRecenterOnlyController
Used to recenter only the controllers, required for scenes that have no clear forward direction.
Summary
Details: https://developers.google.com/vr/distribute/daydream/design-requirements#UX-D6
Works by offsetting the orientation of the transform when a recenter occurs to correct for the orientation change caused by the recenter event.
Usage: Place on the parent of the camera that should have its orientation corrected.