@Override
  public @Nullable Map<String, Object> obtainExtrasFromImage(ImageInfo info) {
    if (info == null) return null;
    return info.getExtras();
  }
updateDebugOverlay updates the debug overlay. Subclasses of {@link PipelineDraweeController}
can override this method (and call <code>super</code>) to provide additional debug information.
drawee-backends/drawee-pipeline/src/main/java/com/facebook/drawee/backends/pipeline/PipelineDraweeController.java