public void setChromeShadowColor(int color) {
    if (chromeShadowColor != color) {
      viewBorderPaint.setShadowLayer(1, -1, 1, color);
      chromeShadowColor = color;
      invalidate();
    }
  }
Set the view border chrome shadow color.
saklib/src/main/java/com/wanjian/sak/layer/impl/ScalpelFrameLayout.java