Expose the CSS background-blend-mode property,

Source/core/css/parser/BisonCSSParser-in.cpp

Index: Source/core/css/parser/BisonCSSParser-in.cpp
diff --git a/Source/core/css/parser/BisonCSSParser-in.cpp b/Source/core/css/parser/BisonCSSParser-in.cpp
index 695cd2aea2f724ad5f419ea35cd5ba47880dac33..0ef300f080d2495ec6cce12d26cd60a0b6c7cca9 100644
--- a/Source/core/css/parser/BisonCSSParser-in.cpp
+++ b/Source/core/css/parser/BisonCSSParser-in.cpp
@@ -4102,12 +4102,12 @@ bool CSSPropertyParser::parseFillProperty(CSSPropertyID propId, CSSPropertyID& p
                     }
                     break;
                 case CSSPropertyBackgroundBlendMode:
-                    if (RuntimeEnabledFeatures::cssCompositingEnabled() && (val->id == CSSValueNormal || val->id == CSSValueMultiply
+                    if (val->id == CSSValueNormal || val->id == CSSValueMultiply
                         || val->id == CSSValueScreen || val->id == CSSValueOverlay || val->id == CSSValueDarken
                         || val->id == CSSValueLighten ||  val->id == CSSValueColorDodge || val->id == CSSValueColorBurn
                         || val->id == CSSValueHardLight || val->id == CSSValueSoftLight || val->id == CSSValueDifference
                         || val->id == CSSValueExclusion || val->id == CSSValueHue || val->id == CSSValueSaturation
-                        || val->id == CSSValueColor || val->id == CSSValueLuminosity)) {
+                        || val->id == CSSValueColor || val->id == CSSValueLuminosity) {
                         currValue = cssValuePool().createIdentifierValue(val->id);
                         m_valueList->next();
                     }