Provide gtest printers for ui/gfx geometry types

ui/gfx/geometry/rect_f.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_GEOMETRY_RECT_F_H_
 #define UI_GFX_GEOMETRY_RECT_F_H_
 
+#include <iosfwd>
 #include <string>
 
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/rect_base.h"
 #include "ui/gfx/geometry/size_f.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
 namespace gfx {
 
 class InsetsF;
@@ skipping 83 matching lines @@
 // This could also be thought of as "the smallest rect that contains both
 // points", except that we consider points on the right/bottom edges of the
 // rect to be outside the rect.  So technically one or both points will not be
 // contained within the rect, because they will appear on one of these edges.
 GFX_EXPORT RectF BoundingRect(const PointF& p1, const PointF& p2);
 
 #if !defined(COMPILER_MSVC)
 extern template class RectBase<RectF, PointF, SizeF, InsetsF, Vector2dF, float>;
 #endif
 
+// This is declared here for use in gtest-based unit tests but is defined in
+// the gfx_test_support target. Depend on that to use this in your unit test.
+// This should not be used in production code - call ToString() instead.
+void PrintTo(const RectF& rect, ::std::ostream* os);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_GEOMETRY_RECT_F_H_