code: public T addDelayedEvaluator(@NonNull DelayedEvaluator delayed) {
          if (mDelayed == null) {
              mDelayed = new ArrayList<>(4);
          }
          mDelayed.add(delayed);
          return self();
      }
docs: Adds a DelayedEvaluator whose evaluate(View, BaseTransitionBuilder) method will only be called
  when the transition is about to start.
  
  @param delayed
  @return