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diff --git a/Source/WebCore/platform/graphics/android/TileTexture.h b/Source/WebCore/platform/graphics/android/TileTexture.h
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+++ b/Source/WebCore/platform/graphics/android/TileTexture.h
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+/*
+ * Copyright 2010, The Android Open Source Project
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TileTexture_h
+#define TileTexture_h
+
+#include "TextureInfo.h"
+#include "Color.h"
+#include "SkBitmap.h"
+#include "SkRect.h"
+#include "SkSize.h"
+
+#include <GLES2/gl2.h>
+
+class SkCanvas;
+
+namespace WebCore {
+
+class TextureOwner;
+class Tile;
+class TransformationMatrix;
+
+class TileTexture {
+public:
+    // This object is to be constructed on the consumer's thread and must have
+    // a width and height greater than 0.
+    TileTexture(uint32_t w, uint32_t h);
+    virtual ~TileTexture();
+
+    // allows consumer thread to assign ownership of the texture to the tile. It
+    // returns false if ownership cannot be transferred because the tile is busy
+    bool acquire(TextureOwner* owner, bool force = false);
+    bool release(TextureOwner* owner);
+
+    // set the texture owner if not busy. Return false if busy, true otherwise.
+    bool setOwner(TextureOwner* owner, bool force = false);
+
+    // private member accessor functions
+    TextureOwner* owner() { return m_owner; } // only used by the consumer thread
+
+    const SkSize& getSize() const { return m_size; }
+
+    // OpenGL ID of backing texture, 0 when not allocated
+    GLuint m_ownTextureId;
+    // these are used for dynamically (de)allocating backing graphics memory
+    void requireGLTexture();
+    void discardGLTexture();
+
+    void transferComplete();
+
+    TextureInfo* getTextureInfo() { return &m_ownTextureInfo; }
+
+    // Make sure the following pureColor getter/setter are only read/written
+    // in UI thread. Therefore no need for a lock.
+    void setPure(bool pure) { m_isPureColor = pure; }
+    bool isPureColor() {return m_isPureColor; }
+    void setPureColor(const Color& color) { m_pureColor = color; setPure(true); }
+    Color pureColor() { return m_pureColor; }
+
+    void drawGL(bool isLayer, const SkRect& rect, float opacity,
+                const TransformationMatrix* transform);
+private:
+    TextureInfo m_ownTextureInfo;
+    SkSize m_size;
+    SkBitmap::Config m_config;
+
+    // Tile owning the texture, only modified by UI thread
+    TextureOwner* m_owner;
+
+    // When the whole tile is single color, skip the transfer queue and draw
+    // it directly through shader.
+    bool m_isPureColor;
+    Color m_pureColor;
+};
+
+} // namespace WebCore
+
+#endif // TileTexture_h