Merge "Change how we set NotificationBackgroundView colors for row transparency" into main

    public void setTint(int tintColor) {

        Drawable baseLayer = getBaseBackgroundLayer();

        if (notificationRowTransparency()) {

            // BG base layer being a drawable, there isn't a method like setColor() to color it.

            // Instead, we set a color filter that essentially replaces every pixel of the drawable.

            baseLayer.setColorFilter(

                    new PorterDuffColorFilter(

                            tintColor,

                            // SRC operator discards the drawable's color+alpha

                            PorterDuff.Mode.SRC));

            ((GradientDrawable) baseLayer.mutate()).setColor(tintColor);

        } else {

            baseLayer.mutate().setTintMode(PorterDuff.Mode.SRC_ATOP);

            baseLayer.setTint(tintColor);