Unify geometry test printers in a test support target.

Source/platform/geometry/FloatRect.h

 /*
  * Copyright (C) 2003, 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 13 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef FloatRect_h
 #define FloatRect_h
 
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/FloatRectOutsets.h"
 #include "third_party/skia/include/core/SkRect.h"
 #include "wtf/Vector.h"
+#include <iosfwd>
 
 #if OS(MACOSX)
 typedef struct CGRect CGRect;
 
 #ifdef __OBJC__
 #import <Foundation/Foundation.h>
 #endif
 #endif
 
 namespace blink {
@@ skipping 194 matching lines @@
 PLATFORM_EXPORT IntRect enclosingIntRect(const FloatRect&);
 
 // Returns a valid IntRect contained within the given FloatRect.
 PLATFORM_EXPORT IntRect enclosedIntRect(const FloatRect&);
 
 PLATFORM_EXPORT IntRect roundedIntRect(const FloatRect&);
 
 // Map supplied rect from srcRect to an equivalent rect in destRect.
 PLATFORM_EXPORT FloatRect mapRect(const FloatRect&, const FloatRect& srcRect, const FloatRect& destRect);
 
-}
+// Redeclared here to avoid ODR issues.
+// See platform/testing/GeometryPrinters.h.
+void PrintTo(const FloatRect&, std::ostream*);
+
+} // namespace blink
 
 #endif