Unify geometry test printers in a test support target.

Source/platform/geometry/LayoutRect.h

 /*
  * Copyright (c) 2012, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef LayoutRect_h
 #define LayoutRect_h
 
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/LayoutPoint.h"
 #include "platform/geometry/LayoutRectOutsets.h"
 #include "wtf/Vector.h"
+#include <iosfwd>
 
 namespace blink {
 
 class FloatRect;
 class DoubleRect;
 
 class PLATFORM_EXPORT LayoutRect {
 public:
     LayoutRect() { }
     LayoutRect(const LayoutPoint& location, const LayoutSize& size)
@@ skipping 196 matching lines @@
 inline IntRect pixelSnappedIntRectFromEdges(LayoutUnit left, LayoutUnit top, LayoutUnit right, LayoutUnit bottom)
 {
     return IntRect(left.round(), top.round(), snapSizeToPixel(right - left, left), snapSizeToPixel(bottom - top, top));
 }
 
 inline IntRect pixelSnappedIntRect(LayoutPoint location, LayoutSize size)
 {
     return IntRect(roundedIntPoint(location), pixelSnappedIntSize(size, location));
 }
 
+// Redeclared here to avoid ODR issues.
+// See platform/testing/GeometryPrinters.h.
+void PrintTo(const LayoutRect&, std::ostream*);
+
 } // namespace blink
 
 #endif // LayoutRect_h