Add number() static methods to AtomicString class

Source/core/html/shadow/MediaControlElements.cpp

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 501 matching lines @@
     return inDocument() && document().isActive();
 }
 
 void MediaControlTimelineElement::setPosition(double currentTime)
 {
     setValue(String::number(currentTime));
 }
 
 void MediaControlTimelineElement::setDuration(double duration)
 {
-    setAttribute(maxAttr, String::number(std::isfinite(duration) ? duration : 0));
+    setFloatingPointAttribute(maxAttr, std::isfinite(duration) ? duration : 0);
 }
 
 
 const AtomicString& MediaControlTimelineElement::part() const
 {
     DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-timeline", AtomicString::ConstructFromLiteral));
     return id;
 }
 
 // ----------------------------
@@ skipping 236 matching lines @@
     float fontSize = smallestDimension * 0.05f;
     if (fontSize != m_fontSize) {
         m_fontSize = fontSize;
         setInlineStyleProperty(CSSPropertyFontSize, fontSize, CSSPrimitiveValue::CSS_PX);
     }
 }
 
 // ----------------------------
 
 } // namespace WebCore