Serialize <number> to round to at most 6 decimals

Source/core/css/CSSPrimitiveValue.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 14 matching lines @@
 #include "core/css/CSSCalculationValue.h"
 #include "core/css/CSSHelper.h"
 #include "core/css/CSSMarkup.h"
 #include "core/css/CSSToLengthConversionData.h"
 #include "core/css/Counter.h"
 #include "core/css/Pair.h"
 #include "core/css/Rect.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/dom/Node.h"
 #include "core/style/ComputedStyle.h"
-#include "platform/Decimal.h"
 #include "platform/LayoutUnit.h"
 #include "platform/fonts/FontMetrics.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/ThreadSpecific.h"
 #include "wtf/Threading.h"
 #include "wtf/text/StringBuffer.h"
 #include "wtf/text/StringBuilder.h"
 
 using namespace WTF;
 
@@ skipping 774 matching lines @@
         return propertyName(m_value.propertyID);
     default:
         break;
     }
 
     return String();
 }
 
 static String formatNumber(double number, const char* suffix, unsigned suffixLength)
 {
-    Decimal decimal = Decimal::fromDouble(number);
-    String result = decimal.toString();
+#if OS(WIN)
+    unsigned oldFormat = _set_output_format(_TWO_DIGIT_EXPONENT);
+#endif
+    String result = String::format("%.6g", number);
+#if OS(WIN)
+    _set_output_format(oldFormat);
+#endif
     result.append(suffix, suffixLength);
     return result;
 }
 
 template <unsigned characterCount>
 ALWAYS_INLINE static String formatNumber(double number, const char (&characters)[characterCount])
 {
     return formatNumber(number, characters, characterCount - 1);
 }
 
@@ skipping 289 matching lines @@
         visitor->trace(m_value.shape);
         break;
     default:
         break;
     }
 #endif
     CSSValue::traceAfterDispatch(visitor);
 }
 
 } // namespace blink