Use Length for the stroke-dashoffset property in SVGLayoutStyle

Source/core/animation/css/CSSAnimatableValueFactory.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 424 matching lines @@
         return createFromLength(style.right(), style);
     case CSSPropertyStrokeWidth:
         return AnimatableSVGLength::create(style.strokeWidth());
     case CSSPropertyStopColor:
         return createFromColor(property, style);
     case CSSPropertyStopOpacity:
         return createFromDouble(style.stopOpacity());
     case CSSPropertyStrokeDasharray:
         return AnimatableStrokeDasharrayList::create(style.strokeDashArray());
     case CSSPropertyStrokeDashoffset:
-        return AnimatableSVGLength::create(style.strokeDashOffset());
+        return createFromLength(style.strokeDashOffset(), style);
     case CSSPropertyStrokeMiterlimit:
         return createFromDouble(style.strokeMiterLimit());
     case CSSPropertyStrokeOpacity:
         return createFromDouble(style.strokeOpacity());
     case CSSPropertyStroke:
         return AnimatableSVGPaint::create(
             normalizeSVGPaintType(style.svgStyle().strokePaintType()), normalizeSVGPaintType(style.svgStyle().visitedLinkStrokePaintType()),
             style.svgStyle().strokePaintColor(), style.svgStyle().visitedLinkStrokePaintColor(),
             style.svgStyle().strokePaintUri(), style.svgStyle().visitedLinkStrokePaintUri());
     case CSSPropertyTextDecorationColor:
@@ skipping 83 matching lines @@
     case CSSPropertyZIndex:
         return createFromDouble(style.zIndex());
     default:
         ASSERT_NOT_REACHED();
         // This return value is to avoid a release crash if possible.
         return AnimatableUnknown::create(nullptr);
     }
 }
 
 } // namespace blink