Add platform/geometry pretty printers for logging and testing

third_party/WebKit/Source/platform/geometry/FloatPoint3D.cpp

 /*
     Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <wildfox@kde.org>
                   2004, 2005 Rob Buis <buis@kde.org>
                   2005 Eric Seidel <eric@webkit.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,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Library General Public License for more details.
 
     You should have received a copy of the GNU Library General Public License
     aint with this library; see the file COPYING.LIB.  If not, write to
     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
 */
 
 #include "platform/geometry/FloatPoint3D.h"
 
 #include "wtf/MathExtras.h"
+#include "wtf/text/WTFString.h"
 #include <math.h>
 
 namespace blink {
 
 void FloatPoint3D::normalize()
 {
     float tempLength = length();
 
     if (tempLength) {
         m_x /= tempLength;
         m_y /= tempLength;
         m_z /= tempLength;
     }
 }
 
 float FloatPoint3D::angleBetween(const FloatPoint3D& y) const
 {
     float xLength = this->length();
     float yLength = y.length();
 
     if (xLength && yLength) {
         float cosAngle = this->dot(y) / (xLength * yLength);
         // Due to round-off |cosAngle| can have a magnitude greater than 1.  Clamp the value to [-1,
         // 1] before computing the angle.
         return acos(clampTo(cosAngle, -1.0, 1.0));
     }
     return 0;
 }
 
+String FloatPoint3D::toString() const
+{
+    return String::format("%lg,%lg,%lg", x(), y(), z());
+}
+
 } // namespace blink