_HeadTracking Script for Unity Gvr Cardboard (Advice needed to upgrade to Unity 5.6 GvrEditorEmulator or other new component)

_HeadTracking.cs

//HeadTracking and UI for Gvr Cardboard
//Need to modify for Unity 5.6 new Release (for example, GvrViewerMain replaced by GvrEditorEmulator in new release)
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class _HeadTracking : MonoBehaviour {
	private Vector3[] anlges;
	private int index;
	private Vector3 centerAngle;

	// Use this for initialization
	void Start () {
		angles = new Vector3[80];
		index = 0;
		centerAngle = GvrViewer.Instance.HeadPose.Orientation.eulerAngles;//There is no longer a GvrViewer - Advice Appreciated
	}

	// Update is called once per frame
	void Update () {
		angles [index] = GvrViewer.Instance.HeadPose.Orientation.eulerAngles;//No longer a GvrViewer - Advice Appreciated
		index++; 
		if (index == 80) {
		}
	}
			void CheckMovement(){ //I would like to obtain a data file with Head Tracking coordinates re rather than up or down 
				bool right = false, left = false, up = false, down = false;
				for (int i = 8; i < 80; i++); 
				if(anlges[i].x < centerAngle.x - 20.0f && !left);
				left = true;
			}
		}

[Help] Old C# Unity script used for Gvr Cardboard set to GvrViewerMain will not compile as Unity 5.6 now has new components such as GvrEditorEmulator - Advice Appreciated