infinite() {
        this.bit.style.width = '2%';
        this.bit.style.opacity = '1';
        this.element.classList.remove(CSS_DISCRETE, CSS_DONE, CSS_INFINITE_LONG_RUNNING);
        this.element.classList.add(CSS_ACTIVE, CSS_INFINITE);
        this.longRunningScheduler.schedule();
        return this;
    }
Use this mode to indicate progress that has no total number of work units.