Add platform/geometry pretty printers for logging and testing

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

Index: third_party/WebKit/Source/platform/geometry/FloatPoint3D.cpp
diff --git a/third_party/WebKit/Source/platform/geometry/FloatPoint3D.cpp b/third_party/WebKit/Source/platform/geometry/FloatPoint3D.cpp
index 19dd85be19b5f27fa7318dc0135cb0fdf76a6ef6..6d821db5ad18259225ca8a91290242d7d4513fa0 100644
--- a/third_party/WebKit/Source/platform/geometry/FloatPoint3D.cpp
+++ b/third_party/WebKit/Source/platform/geometry/FloatPoint3D.cpp
@@ -23,6 +23,7 @@
 
 #include "wtf/MathExtras.h"
 #include <math.h>
+#include <ostream> // NOLINT
 
 namespace blink {
 
@@ -51,5 +52,14 @@ float FloatPoint3D::angleBetween(const FloatPoint3D& y) const
     return 0;
 }
 
+std::ostream& operator<<(std::ostream& os, const FloatPoint3D& point)
+{
+    os << "FloatPoint3D("
+        << "x=" << point.x() << ", "
+        << "y=" << point.y() << ", "
+        << "z=" << point.z() << ")";
+    return os;
+}
+
 } // namespace blink