[CSS Shapes] shape-margin in percentage units always computes to 0px

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 1501 matching lines @@
         } else if (value->unit == CSSPrimitiveValue::CSS_URI) {
             parsedValue = CSSPrimitiveValue::create(value->string, CSSPrimitiveValue::CSS_URI);
             addProperty(propId, parsedValue.release(), important);
             return true;
         }
         break;
     case CSSPropertyShapeOutside:
         parsedValue = parseShapeProperty(propId);
         break;
     case CSSPropertyShapeMargin:
-        validPrimitive = (RuntimeEnabledFeatures::cssShapesEnabled() && !id && validUnit(value, FLength | FNonNeg));
+        validPrimitive = (RuntimeEnabledFeatures::cssShapesEnabled() && !id && validUnit(value, FLength | FPercent | FNonNeg));
         break;
     case CSSPropertyShapeImageThreshold:
         validPrimitive = (RuntimeEnabledFeatures::cssShapesEnabled() && !id && validUnit(value, FNumber));
         break;
 
     case CSSPropertyTouchAction:
         // auto | none | [pan-x || pan-y] | manipulation
         return parseTouchAction(important);
 
     case CSSPropertyAlignSelf:
@@ skipping 6990 matching lines @@
         parsedValues->append(CSSPrimitiveValue::createIdentifier(CSSValueFill));
     if (!seenStroke)
         parsedValues->append(CSSPrimitiveValue::createIdentifier(CSSValueStroke));
     if (!seenMarkers)
         parsedValues->append(CSSPrimitiveValue::createIdentifier(CSSValueMarkers));
 
     return parsedValues.release();
 }
 
 } // namespace WebCore