Application.runInBackground
static var runInBackground: bool;
static bool runInBackground;
static runInBackground as bool
Description

Should the player be running when the application is in the background?

Default is false (application pauses when it is in background).
	// Make the game run even when in background
	Application.runInBackground = true;
using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Example() {
        Application.runInBackground = true;
    }
}
import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Example() as void:
		Application.runInBackground = true