Initial import attempt, just to play with. Many things disabled/removed

ui/cc/cc/CCLayerSorter.h

Index: ui/cc/cc/CCLayerSorter.h
diff --git a/ui/cc/cc/CCLayerSorter.h b/ui/cc/cc/CCLayerSorter.h
new file mode 100644
index 0000000000000000000000000000000000000000..cb88e85db54b2997da3dcefb845c5fcca40982ca
--- /dev/null
+++ b/ui/cc/cc/CCLayerSorter.h
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2011 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  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 APPLE INC. AND ITS CONTRIBUTORS ``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 APPLE INC. OR ITS 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 CCLayerSorter_h
+#define CCLayerSorter_h
+
+#include "FloatPoint3D.h"
+#include "FloatQuad.h"
+#include "FloatRect.h"
+#include "cc/CCLayerImpl.h"
+#include <wtf/HashMap.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/Vector.h>
+
+namespace WebKit {
+class WebTransformationMatrix;
+}
+
+namespace WebCore {
+
+class CCLayerSorter {
+    WTF_MAKE_NONCOPYABLE(CCLayerSorter);
+public:
+    CCLayerSorter() : m_zRange(0) { }
+
+    typedef Vector<CCLayerImpl*> LayerList;
+
+    void sort(LayerList::iterator first, LayerList::iterator last);
+
+    // Holds various useful properties derived from a layer's 3D outline.
+    struct LayerShape {
+        LayerShape() { }
+        LayerShape(float width, float height, const WebKit::WebTransformationMatrix& drawTransform);
+
+        float layerZFromProjectedPoint(const FloatPoint&) const;
+
+        FloatPoint3D layerNormal;
+        FloatPoint3D transformOrigin;
+        FloatQuad projectedQuad;
+        FloatRect projectedBounds;
+    };
+
+    enum ABCompareResult {
+        ABeforeB,
+        BBeforeA,
+        None
+    };
+
+    static ABCompareResult checkOverlap(LayerShape*, LayerShape*, float zThreshold, float& weight);
+
+private:
+    struct GraphEdge;
+
+    struct GraphNode {
+        explicit GraphNode(CCLayerImpl* cclayer) : layer(cclayer), incomingEdgeWeight(0) { }
+
+        CCLayerImpl* layer;
+        LayerShape shape;
+        Vector<GraphEdge*> incoming;
+        Vector<GraphEdge*> outgoing;
+        float incomingEdgeWeight;
+    };
+
+    struct GraphEdge {
+        GraphEdge(GraphNode* fromNode, GraphNode* toNode, float weight) : from(fromNode), to(toNode), weight(weight) { };
+
+        GraphNode* from;
+        GraphNode* to;
+        float weight;
+    };
+
+    typedef Vector<GraphNode> NodeList;
+    typedef Vector<GraphEdge> EdgeList;
+    NodeList m_nodes;
+    EdgeList m_edges;
+    float m_zRange;
+
+    typedef HashMap<GraphEdge*, GraphEdge*> EdgeMap;
+    EdgeMap m_activeEdges;
+
+    void createGraphNodes(LayerList::iterator first, LayerList::iterator last);
+    void createGraphEdges();
+    void removeEdgeFromList(GraphEdge*, Vector<GraphEdge*>&);
+};
+
+}
+#endif