message: MINOR: Fix tile key labels created by DebugTile.
  Now text elements get coordinates in world space.
diff: @@ -98,6 +98,7 @@ export class DebugTile extends Tile {
  tileKey.level
  })`;
  + textPosition.add(this.center);
  const textElement = new TextElement(
  text,
  textPosition,
  