Unify geometry test printers in a test support target.

Source/platform/geometry/FloatSize.h

 /*
  * Copyright (C) 2003, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2005 Nokia.  All rights reserved.
  *               2008 Eric Seidel <eric@webkit.org>
  *
  * 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.
@@ skipping 13 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef FloatSize_h
 #define FloatSize_h
 
 #include "platform/geometry/IntPoint.h"
 #include "third_party/skia/include/core/SkSize.h"
 #include "wtf/MathExtras.h"
+#include <iosfwd>
 
 #if OS(MACOSX)
 typedef struct CGSize CGSize;
 
 #ifdef __OBJC__
 #import <Foundation/Foundation.h>
 #endif
 #endif
 
 namespace blink {
@@ skipping 153 matching lines @@
 inline IntSize expandedIntSize(const FloatSize& p)
 {
     return IntSize(clampTo<int>(ceilf(p.width())), clampTo<int>(ceilf(p.height())));
 }
 
 inline IntPoint flooredIntPoint(const FloatSize& p)
 {
     return IntPoint(clampTo<int>(floorf(p.width())), clampTo<int>(floorf(p.height())));
 }
 
+// Redeclared here to avoid ODR issues.
+// See platform/testing/GeometryPrinters.h.
+void PrintTo(const FloatSize&, std::ostream*);
+
 } // namespace blink
 
 #endif // FloatSize_h