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diff --git a/spinning_cube.h b/spinning_cube.h
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+++ b/spinning_cube.h
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+// Copyright 2014 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 PPAPI_EXAMPLES_GLES2_SPINNING_CUBE_SPINNING_CUBE_H_
+
+#define PPAPI_EXAMPLES_GLES2_SPINNING_CUBE_SPINNING_CUBE_H_
+#include "ppapi/c/pp_stdint.h"
+
+class SpinningCube {
+public:
+    SpinningCube();
+    ~SpinningCube();
+    void Init(uint32_t width, uint32_t height);
+    void set_direction(int direction) { direction_ = direction; }
+    void SetFlingMultiplier(float drag_distance, float drag_time);
+    void UpdateForTimeDelta(float delta_time);
+    void UpdateForDragDistance(float distance);
+    void Draw();
+    void OnGLContextLost();
+
+private:
+    class GLState;
+    // Disallow copy and assign.
+    SpinningCube(const SpinningCube& other);
+    SpinningCube& operator=(const SpinningCube& other);
+    void Update();
+    bool initialized_;
+    uint32_t width_;
+    uint32_t height_;
+    // Owned ptr.
+    GLState* state_;
+    float fling_multiplier_;
+    int direction_;
+};
+
+#endif    // PPAPI_EXAMPLES_GLES2_SPINNING_CUBE_SPINNING_CUBE_H_