Add number() static methods to AtomicString class

Source/core/html/parser/HTMLParserIdioms.h

 /*
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 #ifndef HTMLParserIdioms_h
 #define HTMLParserIdioms_h
 
 #include "core/dom/QualifiedName.h"
 #include "core/html/parser/HTMLIdentifier.h"
+#include "platform/Decimal.h"
 #include "wtf/Forward.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-class Decimal;
-
 // Space characters as defined by the HTML specification.
 bool isHTMLSpace(UChar);
 bool isHTMLLineBreak(UChar);
 bool isNotHTMLSpace(UChar);
 
 // Strip leading and trailing whitespace as defined by the HTML specification.
 String stripLeadingAndTrailingHTMLSpaces(const String&);
 template<size_t inlineCapacity>
 String stripLeadingAndTrailingHTMLSpaces(const Vector<UChar, inlineCapacity>& vector)
 {
     return stripLeadingAndTrailingHTMLSpaces(StringImpl::create8BitIfPossible(vector));
 }
 
 // An implementation of the HTML specification's algorithm to convert a number to a string for number and range types.
 String serializeForNumberType(const Decimal&);
 String serializeForNumberType(double);
 
 // Convert the specified string to a decimal/double. If the conversion fails, the return value is fallback value or NaN if not specified.
 // Leading or trailing illegal characters cause failure, as does passing an empty string.
 // The double* parameter may be 0 to check if the string can be parsed without getting the result.
-Decimal parseToDecimalForNumberType(const String&);
-Decimal parseToDecimalForNumberType(const String&, const Decimal& fallbackValue);
-double parseToDoubleForNumberType(const String&);
-double parseToDoubleForNumberType(const String&, double fallbackValue);
+Decimal parseToDecimalForNumberType(const String&, const Decimal& fallbackValue = Decimal::nan());
+double parseToDoubleForNumberType(const String&, double fallbackValue = std::numeric_limits<double>::quiet_NaN());
 
 // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-integers
 bool parseHTMLInteger(const String&, int&);
 
 // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-non-negative-integers
 bool parseHTMLNonNegativeInteger(const String&, unsigned int&);
 
 // Inline implementations of some of the functions declared above.
 
 template<typename CharType>
@@ skipping 35 matching lines @@
 {
     // When the QualifiedName is known to HTMLIdentifier,
     // all we have to do is a pointer compare.
     ASSERT(HTMLIdentifier::isKnown(qName.localName().impl()));
     return tagName.asStringImpl() == qName.localName().impl();
 }
 
 }
 
 #endif