Unify geometry test printers in a test support target.

Source/platform/geometry/FloatPoint.h

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2005 Nokia.  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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 14 matching lines @@
  */
 
 #ifndef FloatPoint_h
 #define FloatPoint_h
 
 #include "platform/geometry/FloatSize.h"
 #include "platform/geometry/IntPoint.h"
 #include "third_party/skia/include/core/SkPoint.h"
 #include "wtf/MathExtras.h"
 #include <algorithm>
+#include <iosfwd>
 
 #if OS(MACOSX)
 typedef struct CGPoint CGPoint;
 
 #ifdef __OBJC__
 #import <Foundation/Foundation.h>
 #endif
 #endif
 
 namespace blink {
@@ skipping 218 matching lines @@
 }
 
 inline FloatSize toFloatSize(const FloatPoint& a)
 {
     return FloatSize(a.x(), a.y());
 }
 
 // Find point where lines through the two pairs of points intersect. Returns false if the lines don't intersect.
 PLATFORM_EXPORT bool findIntersection(const FloatPoint& p1, const FloatPoint& p2, const FloatPoint& d1, const FloatPoint& d2, FloatPoint& intersection);
 
+// Redeclared here to avoid ODR issues.
+// See platform/testing/GeometryPrinters.h.
+void PrintTo(const FloatPoint&, std::ostream*);
+
 }
 
 #endif