Provide gtest printers for ui/gfx geometry types

ui/gfx/geometry/point_f.h

Index: ui/gfx/geometry/point_f.h
diff --git a/ui/gfx/geometry/point_f.h b/ui/gfx/geometry/point_f.h
index 00266d311d0ffad81baaca9d9be55d25fff95f3b..82d00e6eb507b0b86c9f12bd74f8bd393fd7b30a 100644
--- a/ui/gfx/geometry/point_f.h
+++ b/ui/gfx/geometry/point_f.h
@@ -5,6 +5,7 @@
 #ifndef UI_GFX_GEOMETRY_POINT_F_H_
 #define UI_GFX_GEOMETRY_POINT_F_H_
 
+#include <iosfwd>
 #include <string>
 
 #include "ui/gfx/geometry/point_base.h"
@@ -70,6 +71,11 @@ inline PointF ScalePoint(const PointF& p, float scale) {
 extern template class PointBase<PointF, float, Vector2dF>;
 #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 PointF& point, ::std::ostream* os);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_GEOMETRY_POINT_F_H_