add keyboard control for in editor scene changes from test manager

Assets/TestScenes/MobileDeferredTest/TestSceneScript/MobileTestSceneManager.cs

 public class MobileTestSceneManager : MonoBehaviour {
 
 	static int m_NextSceneIndex = 0;
-
-	// Use this for initialization
 	void Start () {
 		if (Instance != null) {
 			GameObject.Destroy (gameObject);
 		}
 	}
-	
-	// Update is called once per frame
+
+#if UNITY_EDITOR
+		if (Input.GetKeyDown(KeyCode.Space)) {
+#else
+#endif
-	}
+	}		
 }