Provide gtest printers for ui/gfx geometry types

ui/gfx/geometry/quad_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_QUAD_F_H_
 #define UI_GFX_GEOMETRY_QUAD_F_H_
 
 #include <algorithm>
 #include <cmath>
+#include <iosfwd>
 #include <string>
 
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/gfx_export.h"
 
 namespace gfx {
 
 // A Quad is defined by four corners, allowing it to have edges that are not
 // axis-aligned, unlike a Rect.
@@ skipping 77 matching lines @@
 inline bool operator!=(const QuadF& lhs, const QuadF& rhs) {
   return !(lhs == rhs);
 }
 
 // Add a vector to a quad, offseting each point in the quad by the vector.
 GFX_EXPORT QuadF operator+(const QuadF& lhs, const Vector2dF& rhs);
 // Subtract a vector from a quad, offseting each point in the quad by the
 // inverse of the vector.
 GFX_EXPORT QuadF operator-(const QuadF& lhs, const Vector2dF& rhs);
 
+// 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 QuadF& quad, ::std::ostream* os);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_GEOMETRY_QUAD_F_H_