Add support for the object-position CSS property.

Source/core/css/CSSComputedStyleDeclaration.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ skipping 139 matching lines @@
     CSSPropertyListStyleType,
     CSSPropertyMarginBottom,
     CSSPropertyMarginLeft,
     CSSPropertyMarginRight,
     CSSPropertyMarginTop,
     CSSPropertyMaxHeight,
     CSSPropertyMaxWidth,
     CSSPropertyMinHeight,
     CSSPropertyMinWidth,
     CSSPropertyMixBlendMode,
+    CSSPropertyObjectFit,
+    CSSPropertyObjectPosition,
     CSSPropertyOpacity,
     CSSPropertyOrphans,
     CSSPropertyOutlineColor,
     CSSPropertyOutlineOffset,
     CSSPropertyOutlineStyle,
     CSSPropertyOutlineWidth,
     CSSPropertyOverflowWrap,
     CSSPropertyOverflowX,
     CSSPropertyOverflowY,
     CSSPropertyPaddingBottom,
@@ skipping 342 matching lines @@
 static PassRefPtr<CSSValue> valueForNinePieceImageRepeat(const NinePieceImage& image)
 {
     RefPtr<CSSPrimitiveValue> horizontalRepeat;
     RefPtr<CSSPrimitiveValue> verticalRepeat;
 
     horizontalRepeat = cssValuePool().createIdentifierValue(valueForRepeatRule(image.horizontalRule()));
     if (image.horizontalRule() == image.verticalRule())
         verticalRepeat = horizontalRepeat;
     else
         verticalRepeat = cssValuePool().createIdentifierValue(valueForRepeatRule(image.verticalRule()));
-    return cssValuePool().createValue(Pair::create(horizontalRepeat.release(), verticalRepeat.release()));
+    return cssValuePool().createValue(Pair::create(horizontalRepeat.release(), verticalRepeat.release(), Pair::DropIdenticalValues));
 }
 
 static PassRefPtr<CSSValue> valueForNinePieceImage(const NinePieceImage& image, const RenderStyle* style)
 {
     if (!image.hasImage())
         return cssValuePool().createIdentifierValue(CSSValueNone);
 
     // Image first.
     RefPtr<CSSValue> imageValue;
     if (image.image())
@@ skipping 1633 matching lines @@
             if (style->minHeight().isAuto())
                 return zoomAdjustedPixelValue(0, style.get());
             return zoomAdjustedPixelValueForLength(style->minHeight(), style.get());
         case CSSPropertyMinWidth:
             // FIXME: For flex-items, min-width:auto should compute to min-content.
             if (style->minWidth().isAuto())
                 return zoomAdjustedPixelValue(0, style.get());
             return zoomAdjustedPixelValueForLength(style->minWidth(), style.get());
         case CSSPropertyObjectFit:
             return cssValuePool().createValue(style->objectFit());
+        case CSSPropertyObjectPosition:
+            return cssValuePool().createValue(
+                Pair::create(
+                    cssValuePool().createValue(style->objectPosition().x()),
+                    cssValuePool().createValue(style->objectPosition().y()),
+                    Pair::KeepIdenticalValues));
         case CSSPropertyOpacity:
             return cssValuePool().createValue(style->opacity(), CSSPrimitiveValue::CSS_NUMBER);
         case CSSPropertyOrphans:
             if (style->hasAutoOrphans())
                 return cssValuePool().createIdentifierValue(CSSValueAuto);
             return cssValuePool().createValue(style->orphans(), CSSPrimitiveValue::CSS_NUMBER);
         case CSSPropertyOutlineColor:
             return m_allowVisitedStyle ? cssValuePool().createColorValue(style->visitedDependentColor(CSSPropertyOutlineColor).rgb()) : currentColorOrValidColor(style.get(), style->outlineColor());
         case CSSPropertyOutlineOffset:
             return zoomAdjustedPixelValue(style->outlineOffset(), style.get());
@@ skipping 1001 matching lines @@
     static const CSSPropertyID propertiesAfterSlashSeperator[3] = { CSSPropertyBackgroundSize, CSSPropertyBackgroundOrigin,
                                                                     CSSPropertyBackgroundClip };
 
     RefPtr<CSSValueList> list = CSSValueList::createSlashSeparated();
     list->append(valuesForShorthandProperty(StylePropertyShorthand(CSSPropertyBackground, propertiesBeforeSlashSeperator, WTF_ARRAY_LENGTH(propertiesBeforeSlashSeperator))));
     list->append(valuesForShorthandProperty(StylePropertyShorthand(CSSPropertyBackground, propertiesAfterSlashSeperator, WTF_ARRAY_LENGTH(propertiesAfterSlashSeperator))));
     return list.release();
 }
 
 } // namespace WebCore