protected void enqueueEvent(Object event, EventHandler handler) {
    eventsToDispatch.get().offer(new EventWithHandler(event, handler));
  }
Queue the {@code event} for dispatch during {@link #dispatchQueuedEvents()}. Events are queued in-order of
occurrence so they can be dispatched in the same order.
otto/src/main/java/com/squareup/otto/Bus.java