Unify geometry test printers in a test support target.

Source/platform/geometry/FloatQuad.h

 /*
  * Copyright (C) 2008 Apple Inc. 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 15 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef FloatQuad_h
 #define FloatQuad_h
 
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/LayoutSize.h"
+#include <iosfwd>
 
 namespace blink {
 
 // A FloatQuad is a collection of 4 points, often representing the result of
 // mapping a rectangle through transforms. When initialized from a rect, the
 // points are in clockwise order from top left.
 class PLATFORM_EXPORT FloatQuad {
 public:
     FloatQuad()
     {
@@ skipping 126 matching lines @@
 }
 
 inline bool operator!=(const FloatQuad& a, const FloatQuad& b)
 {
     return a.p1() != b.p1() ||
            a.p2() != b.p2() ||
            a.p3() != b.p3() ||
            a.p4() != b.p4();
 }
 
-}   // namespace blink
 
+// Redeclared here to avoid ODR issues.
+// See platform/testing/GeometryPrinters.h.
+void PrintTo(const FloatQuad&, std::ostream*);
+
+} // namespace blink
 
 #endif // FloatQuad_h
-