@Override
  public void process(Bitmap bitmap) {
    NativeBlurFilter.iterativeBoxBlur(bitmap, mIterations, mBlurRadius);
  }
A fast and memory-efficient post processor performing an iterative box blur. For details see
{@link NativeBlurFilter#iterativeBoxBlur(Bitmap, int, int)}.
native-filters/src/main/java/com/facebook/imagepipeline/postprocessors/IterativeBoxBlurPostProcessor.java