Add image-rendering: pixelated.

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

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 382 matching lines @@
         // table-column-group | table-column | table-cell | table-caption | -webkit-box | -webkit-inline-box | none
         // flex | inline-flex | -webkit-flex | -webkit-inline-flex | grid | inline-grid | lazy-block
         return (valueID >= CSSValueInline && valueID <= CSSValueInlineFlex) || valueID == CSSValueWebkitFlex || valueID == CSSValueWebkitInlineFlex || valueID == CSSValueNone
             || (RuntimeEnabledFeatures::cssGridLayoutEnabled() && (valueID == CSSValueGrid || valueID == CSSValueInlineGrid));
     case CSSPropertyEmptyCells: // show | hide
         return valueID == CSSValueShow || valueID == CSSValueHide;
     case CSSPropertyFloat: // left | right | none | center (for buggy CSS, maps to none)
         return valueID == CSSValueLeft || valueID == CSSValueRight || valueID == CSSValueNone || valueID == CSSValueCenter;
     case CSSPropertyFontStyle: // normal | italic | oblique
         return valueID == CSSValueNormal || valueID == CSSValueItalic || valueID == CSSValueOblique;
-    case CSSPropertyImageRendering: // auto | optimizeContrast
-        return valueID == CSSValueAuto || valueID == CSSValueWebkitOptimizeContrast;
+    case CSSPropertyImageRendering: // auto | optimizeContrast | pixelated
+        return valueID == CSSValueAuto || valueID == CSSValueWebkitOptimizeContrast || (RuntimeEnabledFeatures::imageRenderingPixelatedEnabled() && valueID == CSSValuePixelated);
     case CSSPropertyIsolation: // auto | isolate
         return RuntimeEnabledFeatures::cssCompositingEnabled()
             && (valueID == CSSValueAuto || valueID == CSSValueIsolate);
     case CSSPropertyListStylePosition: // inside | outside
         return valueID == CSSValueInside || valueID == CSSValueOutside;
     case CSSPropertyListStyleType:
         // See section CSS_PROP_LIST_STYLE_TYPE of file CSSValueKeywords.in
         // for the list of supported list-style-types.
         return (valueID >= CSSValueDisc && valueID <= CSSValueKatakanaIroha) || valueID == CSSValueNone;
     case CSSPropertyObjectFit:
@@ skipping 1696 matching lines @@
     rule->setProperties(createStylePropertySet());
     clearProperties();
 
     StyleRuleViewport* result = rule.get();
     m_parsedRules.append(rule.release());
 
     return result;
 }
 
 }