Factor out common StepRange construction code.

Source/core/html/forms/InputType.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2009, 2010, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
@@ skipping 975 matching lines @@
 }
 
 Decimal InputType::findStepBase(const Decimal& defaultValue) const
 {
     Decimal stepBase = parseToNumber(element().fastGetAttribute(minAttr), Decimal::nan());
     if (!stepBase.isFinite())
         stepBase = parseToNumber(element().fastGetAttribute(valueAttr), defaultValue);
     return stepBase;
 }
 
+StepRange InputType::createStepRange(AnyStepHandling anyStepHandling, const Decimal& stepBaseDefault, const Decimal& minimumDefault, const Decimal& maximumDefault, const StepRange::StepDescription& stepDescription) const
+{
+    const Decimal stepBase = findStepBase(stepBaseDefault);
+    const Decimal minimum = parseToNumber(element().fastGetAttribute(minAttr), minimumDefault);
+    const Decimal maximum = parseToNumber(element().fastGetAttribute(maxAttr), maximumDefault);
+    const Decimal step = StepRange::parseStep(anyStepHandling, stepDescription, element().fastGetAttribute(stepAttr));
+    return StepRange(stepBase, minimum, maximum, step, stepDescription);
+}
+
 } // namespace WebCore