[svg2] Make 'x' and 'y' presentation attributes

Source/core/css/parser/CSSPropertyParser.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 8178 matching lines @@
         if (id == CSSValueNone)
             validPrimitive = true;
         else
             parsedValue = parseSVGStrokeDasharray();
         break;
 
     case CSSPropertyMaskType: // luminance | alpha | inherit
         if (id == CSSValueLuminance || id == CSSValueAlpha)
             validPrimitive = true;
         break;
+    case CSSPropertyX:
+    case CSSPropertyY:
+        validPrimitive = (!id && validUnit(value, FLength | FPercent, SVGAttributeMode));
+        break;
 
     /* shorthand properties */
     case CSSPropertyMarker: {
         ShorthandScope scope(this, propId);
         CSSPropertyParser::ImplicitScope implicitScope(this);
         if (!parseValue(CSSPropertyMarkerStart, important))
             return false;
         if (m_valueList->current()) {
             rollbackLastProperties(1);
             return false;
@@ skipping 368 matching lines @@
         }
     }
 
     if (!list->length())
         return nullptr;
 
     return list.release();
 }
 
 } // namespace blink