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diff --git a/Source/WebCore/platform/graphics/android/layers/Layer.h b/Source/WebCore/platform/graphics/android/layers/Layer.h
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+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef Layer_DEFINED
+#define Layer_DEFINED
+
+#include "DrawExtra.h"
+#include "TestExport.h"
+#include "SkRefCnt.h"
+#include "SkTDArray.h"
+#include "SkColor.h"
+#include "SkMatrix.h"
+#include "SkPoint.h"
+#include "SkRect.h"
+#include "SkRegion.h"
+#include "SkSize.h"
+
+namespace WebCore {
+class IntRect;
+class GLWebViewState;
+};
+
+class SkCanvas;
+
+class TEST_EXPORT Layer : public SkRefCnt {
+
+public:
+    Layer();
+    Layer(const Layer&);
+    virtual ~Layer();
+
+    // Whether the layer should apply its tranform directly onto the root
+    // layer, rather than using the transforms of all ancestor layers. This is
+    // used for fixed position layers.
+    bool shouldInheritFromRootTransform() const { return m_shouldInheritFromRootTransform; }
+    SkScalar getOpacity() const { return m_opacity; }
+    const SkSize& getSize() const { return m_size; }
+    const SkPoint& getPosition() const { return m_position; }
+    const SkPoint& getAnchorPoint() const { return m_anchorPoint; }
+    const SkMatrix& getMatrix() const { return m_matrix; }
+    const SkMatrix& getChildrenMatrix() const { return m_childrenMatrix; }
+
+    SkScalar getWidth() const { return m_size.width(); }
+    SkScalar getHeight() const { return m_size.height(); }
+
+    void setShouldInheritFromRootTransform(bool inherit) { m_shouldInheritFromRootTransform = inherit; }
+    void setOpacity(SkScalar opacity) { m_opacity = opacity; }
+    void setSize(SkScalar w, SkScalar h) { m_size.set(w, h); }
+    void setPosition(SkScalar x, SkScalar y) { m_position.set(x, y); }
+    void setAnchorPoint(SkScalar x, SkScalar y) { m_anchorPoint.set(x, y); }
+    void setMatrix(const SkMatrix& matrix) { m_matrix = matrix; }
+    void setChildrenMatrix(const SkMatrix& matrix) { m_childrenMatrix = matrix; }
+
+// rendering asset management
+    void markAsDirty(const SkRegion& invalRegion) {
+        m_dirtyRegion.op(invalRegion, SkRegion::kUnion_Op);
+    }
+
+    bool isDirty() {
+        return !m_dirtyRegion.isEmpty();
+    }
+
+// drawing
+
+    WebCore::GLWebViewState* state() { return m_state; }
+    void setState(WebCore::GLWebViewState* state);
+
+// children
+
+    /** Return the number of layers in our child list.
+     */
+    int countChildren() const;
+
+    /** Return the child at the specified index (starting at 0). This does not
+        affect the reference count of the child.
+     */
+    Layer* getChild(int index) const;
+
+    /** Add this layer to our child list at the end (top-most), and ref() it.
+        If it was already in another hierarchy, remove it from that list.
+        Return the new child.
+     */
+    Layer* addChild(Layer* child);
+
+    /** Remove this layer from its parent's list (or do nothing if it has no
+        parent.) If it had a parent, then unref() is called.
+     */
+    void detachFromParent();
+
+    /** Remove, and unref(), all of the layers in our child list.
+     */
+    void removeChildren();
+
+    /** Return our parent layer, or NULL if we have none.
+     */
+    Layer* getParent() const { return fParent; }
+
+    /** Return the root layer in this hiearchy. If this layer is the root
+        (i.e. has no parent), then this returns itself.
+     */
+    Layer* getRootLayer() const;
+
+    // coordinate system transformations
+
+    /** Return, in matrix, the matix transfomations that are applied locally
+        when this layer draws (i.e. its position and matrix/anchorPoint).
+        This does not include the childrenMatrix, since that is only applied
+        after this layer draws (but before its children draw).
+     */
+    virtual void getLocalTransform(SkMatrix* matrix) const;
+
+    /** Return, in matrix, the concatenation of transforms that are applied
+        from this layer's root parent to the layer itself.
+        This is the matrix that is applied to the layer during drawing.
+     */
+    void localToGlobal(SkMatrix* matrix) const { localToAncestor(0, matrix); }
+
+    /** Return, as a matrix, the transform that converts from this layer's local
+        space to the space of the given ancestor layer. Use NULL for ancestor to
+        represent the root layer. Note that this method must not be called on a
+        fixed position layer with ancestor != NULL.
+
+        For non-fixed position layers, the following holds (in pseudo-code for
+        brevity) ...
+        SkMatrix localToAncestor = layer->localToAncestor(ancestor);
+        SkMatrix ancestorToGlobal = ancestor->localToAncestor(NULL);
+        SkMatrix localToGlobal = layer->localToGlobal();
+        ASSERT(localToAncestor * ancestorToGlobal == localToGlobal);
+     */
+    void localToAncestor(const Layer* ancestor, SkMatrix* matrix) const;
+
+    // paint method
+
+    virtual bool drawCanvas(SkCanvas*) { return false; }
+    void draw(SkCanvas*, android::DrawExtra* extra, SkScalar opacity = SK_Scalar1);
+
+    void setHasOverflowChildren(bool value) { m_hasOverflowChildren = value; }
+
+    virtual bool contentIsScrollable() const { return false; }
+
+    typedef enum { MergedLayers, UnmergedLayers, FlattenedLayers } PaintStyle;
+protected:
+    virtual void onDraw(SkCanvas*, SkScalar opacity, android::DrawExtra* extra, PaintStyle style) {}
+
+    bool m_hasOverflowChildren;
+
+    bool isAncestor(const Layer*) const;
+
+    Layer* fParent;
+    SkScalar m_opacity;
+    SkSize m_size;
+    // The position of the origin of the layer, relative to the parent layer.
+    SkPoint m_position;
+    // The point in the layer used as the origin for local transformations,
+    // expressed as a fraction of the layer size.
+    SkPoint m_anchorPoint;
+    SkMatrix m_matrix;
+    SkMatrix m_childrenMatrix;
+    bool m_shouldInheritFromRootTransform;
+
+    SkTDArray<Layer*> m_children;
+
+    // invalidation region
+    SkRegion m_dirtyRegion;
+
+    WebCore::GLWebViewState* m_state;
+
+    typedef SkRefCnt INHERITED;
+};
+
+#endif