Add image-rendering: pixelated.

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 fce751488b221aaee1781b55aa2cd22fa889a0ea..138f5d15dafa974f98bc7fc781604f53e47df473 100644
--- a/Source/core/css/parser/BisonCSSParser-in.cpp
+++ b/Source/core/css/parser/BisonCSSParser-in.cpp
@@ -403,7 +403,7 @@ bool isValidKeywordPropertyAndValue(CSSPropertyID propertyId, CSSValueID valueID
     case CSSPropertyFontStyle: // normal | italic | oblique
         return valueID == CSSValueNormal || valueID == CSSValueItalic || valueID == CSSValueOblique;
     case CSSPropertyImageRendering: // auto | optimizeContrast
-        return valueID == CSSValueAuto || valueID == CSSValueWebkitOptimizeContrast;
+        return valueID == CSSValueAuto || valueID == CSSValueWebkitOptimizeContrast || (RuntimeEnabledFeatures::imageRenderingPixelatedEnabled() && valueID == CSSValuePixelated);
     case CSSPropertyIsolation: // auto | isolate
         return RuntimeEnabledFeatures::cssCompositingEnabled()
             && (valueID == CSSValueAuto || valueID == CSSValueIsolate);