Add a SpinningCube to Mojo's sample_app

mojo/examples/sample_app/spinning_cube.h

Index: mojo/examples/sample_app/spinning_cube.h
diff --git a/mojo/examples/sample_app/spinning_cube.h b/mojo/examples/sample_app/spinning_cube.h
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+++ b/mojo/examples/sample_app/spinning_cube.h
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+// 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 MOJO_EXAMPLES_SAMPLE_APP_SPINNING_CUBE_H_
+#define MOJO_EXAMPLES_SAMPLE_APP_SPINNING_CUBE_H_
+
+#include "base/memory/scoped_ptr.h"
+
+namespace gpu {
+namespace gles2 {
+class GLES2Interface;
+}
+}
+
+namespace mojo {
+namespace examples {
+
+class SpinningCube {
+ public:
+  SpinningCube();
+  ~SpinningCube();
+
+  void BindTo(gpu::gles2::GLES2Interface* gl,
+              int width,
+              int height);
+  void OnGLContextLost();
+
+  void Update(float delta_time);
+  void Draw();
+
+ private:
+  class GLState;
+
+  gpu::gles2::GLES2Interface* gl_;
+  int width_;
+  int height_;
+  scoped_ptr<GLState> state_;
+};
+
+}  // namespace examples
+}  // namespace mojo
+
+#endif  // MOJO_EXAMPLES_SAMPLE_APP_SPINNING_CUBE_H_