CSSValueList
static final int CSS_FILTER_BLUR = 10;
static final int CSS_FILTER_BRIGHTNESS = 8;
static final int CSS_FILTER_CONTRAST = 9;
static final int CSS_FILTER_CUSTOM = 12;
static final int CSS_FILTER_DROP_SHADOW = 11;
static final int CSS_FILTER_GRAYSCALE = 2;
static final int CSS_FILTER_HUE_ROTATE = 5;
static final int CSS_FILTER_INVERT = 6;
static final int CSS_FILTER_OPACITY = 7;
static final int CSS_FILTER_REFERENCE = 1;
static final int CSS_FILTER_SATURATE = 4;
static final int CSS_FILTER_SEPIA = 3;
final int operationType;