Avoid duplicating the CSS property mapping for SVG pres. attrs.

third_party/WebKit/Source/core/svg/SVGAnimatedPath.cpp

 /*
  * Copyright (C) 2014 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 12 matching lines @@
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "core/svg/SVGAnimatedPath.h"
 
+#include "core/css/CSSIdentifierValue.h"
+
 namespace blink {
 
 SVGAnimatedPath::SVGAnimatedPath(SVGElement* contextElement,
                                  const QualifiedName& attributeName,
                                  CSSPropertyID cssPropertyId)
     : SVGAnimatedProperty<SVGPath>(contextElement,
                                    attributeName,
                                    SVGPath::create(),
                                    cssPropertyId) {}
 
 SVGAnimatedPath::~SVGAnimatedPath() {}
 
+const CSSValue* SVGAnimatedPath::cssValue() const {
+  const CSSPathValue* pathValue = currentValue()->pathValue();
+  if (pathValue->stylePath()->byteStream().isEmpty())
+    return CSSIdentifierValue::create(CSSValueNone);
+  return pathValue;
+}
+
 }  // namespace blink