code: public GenericDraweeHierarchyBuilder setProgressBarImage(
        Drawable progressBarDrawable, @Nullable ScalingUtils.ScaleType progressBarImageScaleType) {
      mProgressBarImage = progressBarDrawable;
      mProgressBarImageScaleType = progressBarImageScaleType;
      return this;
    }
docs: Sets the progress bar image and its scale type.
  
  @param progressBarDrawable drawable to be used as progress bar image
  @param progressBarImageScaleType scale type for the progress bar image
  @return modified instance of this builder