Merge "Synchronize access to the main looper" into nyc-dev

     * Note that while this can be called several time, the first call to {@link #cleanupThread()}

     * will do the clean-up, and make the thread unable to do further scene actions.

     */

    public static void prepareThread() {

    public synchronized static void prepareThread() {

        // we need to make sure the Looper has been initialized for this thread.

        // this is required for View that creates Handler objects.

        if (Looper.myLooper() == null) {

     * Note that it doesn't matter how many times {@link #prepareThread()} was called, a single

     * call to this will prevent the thread from doing further scene actions

     */

    public static void cleanupThread() {

    public synchronized static void cleanupThread() {

        // clean up the looper

        Looper_Accessor.cleanupThread();

    }