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diff --git a/Source/WebCore/platform/graphics/android/rendering/Surface.h b/Source/WebCore/platform/graphics/android/rendering/Surface.h
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+++ b/Source/WebCore/platform/graphics/android/rendering/Surface.h
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+/*
+ * Copyright 2012, 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 Surface_h
+#define Surface_h
+
+#include "Color.h"
+#include "IntRect.h"
+#include "TilePainter.h"
+#include "Vector.h"
+
+class SkCanvas;
+class SkRegion;
+
+namespace WebCore {
+
+class Tile;
+class SurfaceBacking;
+class LayerAndroid;
+class TexturesResult;
+
+class Surface : public TilePainter {
+public:
+    Surface();
+    virtual ~Surface();
+
+    bool tryUpdateSurface(Surface* oldSurface);
+
+    void addLayer(LayerAndroid* layer, const TransformationMatrix& transform);
+    void prepareGL(bool layerTilesDisabled);
+    bool drawGL(bool layerTilesDisabled);
+    void swapTiles();
+    bool isReady();
+
+    void computeTexturesAmount(TexturesResult* result);
+
+    LayerAndroid* getFirstLayer() { return m_layers[0]; }
+    bool needsTexture() { return m_needsTexture; }
+    bool hasText() { return m_hasText; }
+    bool isBase();
+    void setBackground(Color background) { m_background = background; }
+
+    // TilePainter methods
+    virtual bool paint(Tile* tile, SkCanvas* canvas);
+    virtual float opacity();
+    virtual Color* background();
+
+private:
+    IntRect computePrepareArea();
+    IntRect visibleArea();
+    IntRect unclippedArea();
+    bool singleLayer() { return m_layers.size() == 1; }
+    void updateBackground(const Color& background);
+    bool useAggressiveRendering();
+
+    const TransformationMatrix* drawTransform();
+    IntRect m_unclippedArea;
+    TransformationMatrix m_drawTransform;
+
+    SurfaceBacking* m_surfaceBacking;
+    bool m_needsTexture;
+    bool m_hasText;
+    Vector<LayerAndroid*> m_layers;
+
+    Color m_background;
+};
+
+class LayerMergeState {
+public:
+    LayerMergeState(Vector<Surface*>* const allGroups)
+        : surfaceList(allGroups)
+        , currentSurface(0)
+        , nonMergeNestedLevel(-1) // start at -1 to ignore first LayerAndroid's clipping
+        , depth(0)
+        {}
+
+    // vector storing all generated layer groups
+    Vector<Surface*>* const surfaceList;
+
+    // currently merging group. if cleared, no more layers may join
+    Surface* currentSurface;
+
+    // records depth within non-mergeable parents (clipping, fixed, scrolling)
+    // and disable merging therein.
+    int nonMergeNestedLevel;
+
+    // counts layer tree depth for debugging
+    int depth;
+};
+
+} // namespace WebCore
+
+#endif //#define Surface_h