Provide gtest printers for ui/gfx geometry types

ui/gfx/geometry/point3_f.h

 // Copyright (c) 2011 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_POINT3_F_H_
 #define UI_GFX_GEOMETRY_POINT3_F_H_
 
+#include <iosfwd>
 #include <string>
 
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/vector3d_f.h"
 #include "ui/gfx/gfx_export.h"
 
 namespace gfx {
 
 // A point has an x, y and z coordinate.
 class GFX_EXPORT Point3F {
@@ skipping 90 matching lines @@
                           float x_scale,
                           float y_scale,
                           float z_scale) {
   return Point3F(p.x() * x_scale, p.y() * y_scale, p.z() * z_scale);
 }
 
 inline Point3F ScalePoint(const Point3F& p, float scale) {
   return ScalePoint(p, scale, scale, scale);
 }
 
+// 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 Point3F& point, ::std::ostream* os);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_GEOMETRY_POINT3_F_H_