Add number() static methods to AtomicString class

Source/core/html/HTMLProgressElement.cpp

Index: Source/core/html/HTMLProgressElement.cpp
diff --git a/Source/core/html/HTMLProgressElement.cpp b/Source/core/html/HTMLProgressElement.cpp
index ed23025a01191217a732299473644f75c56b6545..a2006c19c8fbe828d71c592e29c2eccb96ec2e82 100644
--- a/Source/core/html/HTMLProgressElement.cpp
+++ b/Source/core/html/HTMLProgressElement.cpp
@@ -104,7 +104,7 @@ void HTMLProgressElement::setValue(double value, ExceptionState& exceptionState)
         exceptionState.throwDOMException(NotSupportedError, ExceptionMessages::failedToSet("value", "HTMLProgressElement", ExceptionMessages::notAFiniteNumber(value)));
         return;
     }
-    setAttribute(valueAttr, String::number(value >= 0 ? value : 0));
+    setAttribute(valueAttr, AtomicString::number(value >= 0 ? value : 0));

[eseidel, 2013/11/24 21:37:44]

std::max(0, value)?

 }
 
 double HTMLProgressElement::max() const
@@ -119,7 +119,7 @@ void HTMLProgressElement::setMax(double max, ExceptionState& exceptionState)
         exceptionState.throwDOMException(NotSupportedError, ExceptionMessages::failedToSet("max", "HTMLProgressElement", ExceptionMessages::notAFiniteNumber(max)));
         return;
     }
-    setAttribute(maxAttr, String::number(max > 0 ? max : 1));
+    setAttribute(maxAttr, AtomicString::number(max > 0 ? max : 1));

[eseidel, 2013/11/24 21:37:44]

std::max(1, value)?

[Inactive, 2013/11/24 22:06:20]

This is not equivalent. 0.5 is a valid input value but would be converted to 1
std::max(1, value).

By the way, this code is not according to specification. The specification says
that if the input value is inferior or equal to 0, it should be ignored.
Currently, we reset the max to 1.0 in this case:
http://www.whatwg.org/specs/web-apps/current-work/#dom-progress-max
http://www.whatwg.org/specs/web-apps/current-work/#limited-to-numbers-greater...

 }
 
 double HTMLProgressElement::position() const