Improve default value handling for SVGSVGElement.width/height

third_party/WebKit/Source/core/svg/SVGAnimatedLength.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 16 matching lines @@
  * (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/SVGAnimatedLength.h"
 
 #include "core/svg/SVGLength.h"
 
 namespace blink {
 
+void SVGAnimatedLength::setDefaultValue()
+{
+    setDefaultValueAsString(m_defaultValue);
+}
+
 void SVGAnimatedLength::setDefaultValueAsString(const String& value)
 {
     baseValue()->setValueAsString(value);
 }
 
 SVGParsingError SVGAnimatedLength::setBaseValueAsString(const String& value)
 {
+    if (value.isNull()) {
+        setDefaultValue();
+        return SVGParseStatus::NoError;
+    }
+
     SVGParsingError parseStatus = baseValue()->setValueAsString(value);
 
     if (parseStatus != SVGParseStatus::NoError)
-        baseValue()->newValueSpecifiedUnits(CSSPrimitiveValue::UnitType::UserUnits, 0);
+        setDefaultValue();
     else if (SVGLength::negativeValuesForbiddenForAnimatedLengthAttribute(attributeName()) && baseValue()->valueInSpecifiedUnits() < 0)
         parseStatus = SVGParseStatus::NegativeValue;
 
     return parseStatus;
 }
 
 } // namespace blink