Fix problems with flakes in SVG LayoutTests by reordering arithmetic.

Source/core/svg/SVGLength.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  *
  * 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 51 matching lines @@
     float value(const SVGLengthContext& context) const
     {
         return value(context, IGNORE_EXCEPTION);
     }
     float value(const SVGLengthContext&, ExceptionState&) const;
     void setValue(float, const SVGLengthContext&, ExceptionState&);
 
     float valueInSpecifiedUnits() const { return m_valueInSpecifiedUnits; }
     void setValueInSpecifiedUnits(float value) { m_valueInSpecifiedUnits = value; }
 
+    // Resolves LengthTypePercentage into a normalized floating point number (full value is 1.0).
     float valueAsPercentage() const;
 
+    // Returns a number to be used as percentage (so full value is 100)
+    float valueAsPercentage100() const;
+
+    // Scale the input value by this SVGLength. Higher precision than input * valueAsPercentage().
+    float scaleByPercentage(float) const;
+
     virtual String valueAsString() const override;
     void setValueAsString(const String&, ExceptionState&);
 
     void newValueSpecifiedUnits(SVGLengthType, float valueInSpecifiedUnits);
     void convertToSpecifiedUnits(SVGLengthType, const SVGLengthContext&, ExceptionState&);
 
     // Helper functions
     inline bool isRelative() const
     {
         return m_unitType == LengthTypePercentage
@@ skipping 30 matching lines @@
 inline PassRefPtrWillBeRawPtr<SVGLength> toSVGLength(PassRefPtrWillBeRawPtr<SVGPropertyBase> passBase)
 {
     RefPtrWillBeRawPtr<SVGPropertyBase> base = passBase;
     ASSERT(base->type() == SVGLength::classType());
     return static_pointer_cast<SVGLength>(base.release());
 }
 
 } // namespace blink
 
 #endif // SVGLength_h