Provide gtest printers for ui/gfx geometry types

ui/gfx/geometry/box_f.h

 // Copyright 2013 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_BOX_F_H_
 #define UI_GFX_GEOMETRY_BOX_F_H_
 
+#include <iosfwd>
+#include <string>
+
 #include "ui/gfx/geometry/point3_f.h"
 #include "ui/gfx/geometry/vector3d_f.h"
 
 namespace gfx {
 
 // A 3d version of gfx::RectF, with the positive z-axis pointed towards
 // the camera.
 class GFX_EXPORT BoxF {
  public:
   BoxF()
@@ skipping 130 matching lines @@
 
 inline BoxF operator+(const BoxF& b, const Vector3dF& v) {
   return BoxF(b.x() + v.x(),
               b.y() + v.y(),
               b.z() + v.z(),
               b.width(),
               b.height(),
               b.depth());
 }
 
+// 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 BoxF& box, ::std::ostream* os);

[danakj, 2014/07/07 18:52:27]

can we forward-declare std::ostream instead of including headers?

[jamesr, 2014/07/07 19:37:25]

We are - the <iosfwd> header has forward declarations for std::ostream and
friends.  We can't forward declare things in std "by hand", only the library
implementation knows enough about these types to say how to forward declare them
correctly

[danakj, 2014/07/07 19:40:05]

Ooh, cool. #til

+
 }  // namespace gfx
 
 #endif  // UI_GFX_GEOMETRY_BOX_F_H_