Extend the geometry APIs.

mojo/services/geometry/cpp/formatting.h

+// Copyright 2015 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 MOJO_SERVICES_GEOMETRY_CPP_FORMATTING_H_
+#define MOJO_SERVICES_GEOMETRY_CPP_FORMATTING_H_
+
+#include "mojo/public/cpp/bindings/formatting.h"
+#include "mojo/services/geometry/interfaces/geometry.mojom.h"
+
+namespace mojo {
+
+std::ostream& operator<<(std::ostream& os, const mojo::Point& value);
+std::ostream& operator<<(std::ostream& os, const mojo::Size& value);
+std::ostream& operator<<(std::ostream& os, const mojo::Rect& value);
+std::ostream& operator<<(std::ostream& os, const mojo::RRect& value);
+std::ostream& operator<<(std::ostream& os, const mojo::Transform& value);
+
+}  // namespace mojo
+
+#endif  // MOJO_SERVICES_GEOMETRY_CPP_FORMATTING_H_