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diff --git a/Source/WebCore/platform/graphics/android/BaseTileTexture.h b/Source/WebCore/platform/graphics/android/BaseTileTexture.h
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+++ b/Source/WebCore/platform/graphics/android/BaseTileTexture.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 BaseTileTexture_h
+#define BaseTileTexture_h
+
+#include "DoubleBufferedTexture.h"
+#include "GLWebViewState.h"
+#include "TextureOwner.h"
+#include <SkBitmap.h>
+
+class SkCanvas;
+
+namespace WebCore {
+
+class BaseTile;
+
+class TextureTileInfo {
+ public:
+  TextureTileInfo()
+      : m_x(-1)
+      , m_y(-1)
+      , m_layerId(-1)
+      , m_scale(0)
+      , m_texture(0)
+      , m_picture(0)
+  {
+  }
+  int m_x;
+  int m_y;
+  int m_layerId;
+  float m_scale;
+  TextureInfo* m_texture;
+  unsigned int m_picture;
+};
+
+// DoubleBufferedTexture using a SkBitmap as backing mechanism
+class BaseTileTexture : public DoubleBufferedTexture {
+public:
+    // This object is to be constructed on the consumer's thread and must have
+    // a width and height greater than 0.
+    BaseTileTexture(uint32_t w, uint32_t h);
+    virtual ~BaseTileTexture();
+
+    // these functions override their parent
+    virtual TextureInfo* producerLock();
+    virtual void producerRelease();
+    virtual void producerReleaseAndSwap();
+
+    // updates the texture with current bitmap and releases (and if needed also
+    // swaps) the texture.
+    virtual void producerUpdate(TextureInfo* textureInfo, const SkBitmap& bitmap);
+
+    // The level can be one of the following values:
+    //  * -1 for an unused texture.
+    //  *  0 for the tiles intersecting with the viewport.
+    //  *  n where n > 0 for the distance between the viewport and the tile.
+    // We use this to prioritize the order in which we reclaim textures, see
+    // TilesManager::getAvailableTexture() for more information.
+    int usedLevel() { return m_usedLevel; }
+    void setUsedLevel(int used) { m_usedLevel = used; }
+
+    // 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);
+    bool tryAcquire(TextureOwner* owner, TiledPage* currentPage, TiledPage* nextPage);
+
+    // 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
+    TextureOwner* delayedReleaseOwner() { return m_delayedReleaseOwner; }
+
+    bool busy();
+    void setNotBusy();
+
+    const SkSize& getSize() const { return m_size; }
+
+    void setTile(TextureInfo* info, int x, int y, float scale, unsigned int pictureCount);
+    bool readyFor(BaseTile* baseTile);
+
+protected:
+    HashMap<SharedTexture*, TextureTileInfo*> m_texturesInfo;
+
+private:
+    void destroyTextures(SharedTexture** textures);
+
+    SkSize m_size;
+    int m_usedLevel;
+    SkBitmap::Config m_config;
+    TextureOwner* m_owner;
+
+    // When trying to release a texture, we may delay this if the texture is
+    // currently used (busy being painted). We use the following two variables
+    // to do so in setNotBusy()
+    TextureOwner* m_delayedReleaseOwner;
+    bool m_delayedRelease;
+
+    // This values signals that the texture is currently in use by the consumer.
+    // This allows us to prevent the owner of the texture from changing while the
+    // consumer is holding a lock on the texture.
+    bool m_busy;
+    // We mutex protect the reads/writes of m_busy to ensure that we are reading
+    // the most up-to-date value even across processors in an SMP system.
+    android::Mutex m_busyLock;
+    // We use this condition variable to signal that the texture
+    // is not busy anymore
+    android::Condition m_busyCond;
+};
+
+} // namespace WebCore
+
+#endif // BaseTileTexture_h