Implement all shorthand 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 2835 matching lines @@
         case CSSPropertyBaselineShift:
         case CSSPropertyDominantBaseline:
         case CSSPropertyGlyphOrientationHorizontal:
         case CSSPropertyGlyphOrientationVertical:
         case CSSPropertyKerning:
         case CSSPropertyTextAnchor:
         case CSSPropertyVectorEffect:
         case CSSPropertyPaintOrder:
         case CSSPropertyWritingMode:
             return getSVGPropertyCSSValue(propertyID, DoNotUpdateLayout);
+
+        case CSSPropertyAll:
+        {
+            // FIXME: need to support "unset".
+            bool isInitial = true;
+            bool isInherit = true;
+            for (unsigned i = 0; i < allShorthand().length() && (isInitial || isInherit); ++i) {
+                RefPtrWillBeRawPtr<CSSValue> value = getPropertyCSSValue(allShorthand().properties()[i], DoNotUpdateLayout);
+                isInitial = isInitial && value->isInitialValue();
+                isInherit = isInherit && value->isInheritedValue();
+            }
+            if (isInitial)
+                return cssValuePool().createExplicitInitialValue();
+            if (isInherit)
+                return cssValuePool().createInheritedValue();
+            return nullptr;
+        }
     }
 
     logUnimplementedPropertyID(propertyID);
     return nullptr;
 }
 
 String CSSComputedStyleDeclaration::getPropertyValue(CSSPropertyID propertyID) const
 {
     RefPtrWillBeRawPtr<CSSValue> value = getPropertyCSSValue(propertyID);
     if (value)
@@ skipping 176 matching lines @@
     static const CSSPropertyID propertiesAfterSlashSeperator[3] = { CSSPropertyBackgroundSize, CSSPropertyBackgroundOrigin,
                                                                     CSSPropertyBackgroundClip };
 
     RefPtrWillBeRawPtr<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