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diff --git a/Source/WebCore/platform/graphics/android/rendering/SurfaceBacking.h b/Source/WebCore/platform/graphics/android/rendering/SurfaceBacking.h
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+++ b/Source/WebCore/platform/graphics/android/rendering/SurfaceBacking.h
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+/*
+ * Copyright 2011, 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 SurfaceBacking_h
+#define SurfaceBacking_h
+
+#include "SkRefCnt.h"
+#include "TileGrid.h"
+
+namespace WebCore {
+
+class LayerAndroid;
+class TexturesResult;
+class TilePainter;
+
+class SurfaceBacking : public SkRefCnt {
+// TODO: investigate webkit threadsafe ref counting
+public:
+    SurfaceBacking(bool isBaseSurface);
+    ~SurfaceBacking();
+    void prepareGL(GLWebViewState* state, bool allowZoom,
+                   const IntRect& prepareArea, const IntRect& unclippedArea,
+                   TilePainter* painter, bool aggressiveRendering);
+    void swapTiles();
+    void drawGL(const IntRect& visibleArea, float opacity,
+                const TransformationMatrix* transform, bool aggressiveRendering,
+                const Color* background);
+    void markAsDirty(const SkRegion& dirtyArea);
+    void computeTexturesAmount(TexturesResult* result, LayerAndroid* layer);
+    void discardTextures()
+    {
+        m_frontTexture->discardTextures();
+        m_backTexture->discardTextures();
+    }
+    bool isReady()
+    {
+        return !m_zooming && m_frontTexture->isReady() && m_scale > 0;
+    }
+
+    int nbTextures(IntRect& area, float scale)
+    {
+        // TODO: consider the zooming case for the backTexture
+        if (!m_frontTexture)
+            return 0;
+        return m_frontTexture->nbTextures(area, scale);
+    }
+
+private:
+    void swapTileGrids();
+
+    // Delay before we schedule a new tile at the new scale factor
+    static const double s_zoomUpdateDelay = 0.2; // 200 ms
+
+    TileGrid* m_frontTexture;
+    TileGrid* m_backTexture;
+    float m_scale;
+    float m_futureScale;
+    double m_zoomUpdateTime;
+    bool m_zooming;
+};
+
+} // namespace WebCore
+
+#endif // SurfaceBacking_h