code: @Override
      public void draw(Canvas canvas) {
          drawSpacings(canvas);
          drawBaselineGrid(canvas);
          drawKeylines(canvas);
      }
docs: Draws the {@link DesignSpec}. You should call this in your {@link View}'s
  {@link View#onDraw(Canvas)} method if you're not simply enclosing it with a
  {@link DesignSpecFrameLayout}.