docs: private MediaTracker getTracker() {
          // Opt: Only synchronize if trackerObj comes back null?
          // If null, synchronize, re-check for null, and put new tracker
          synchronized(this) {
              if (tracker == null) {
                  @SuppressWarnings("serial")
                  Component comp = new Component() {};
                  tracker = new MediaTracker(comp);
              }
          }
          return (MediaTracker) tracker;
      }