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

ui/cc/cc/CCLayerTreeHostCommon.h

Index: ui/cc/cc/CCLayerTreeHostCommon.h
diff --git a/ui/cc/cc/CCLayerTreeHostCommon.h b/ui/cc/cc/CCLayerTreeHostCommon.h
new file mode 100644
index 0000000000000000000000000000000000000000..e5a4fec9c156e4f51019e6f66bf6a18c86063b2c
--- /dev/null
+++ b/ui/cc/cc/CCLayerTreeHostCommon.h
@@ -0,0 +1,105 @@
+/*
+ * 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 CCLayerTreeHostCommon_h
+#define CCLayerTreeHostCommon_h
+
+#include "IntRect.h"
+#include "IntSize.h"
+#include <public/WebTransformationMatrix.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class CCLayerImpl;
+class CCLayerSorter;
+class LayerChromium;
+
+class CCLayerTreeHostCommon {
+public:
+    static IntRect calculateVisibleRect(const IntRect& targetSurfaceRect, const IntRect& layerBoundRect, const WebKit::WebTransformationMatrix&);
+
+    static void calculateDrawTransforms(LayerChromium*, LayerChromium* rootLayer, const WebKit::WebTransformationMatrix& parentMatrix, const WebKit::WebTransformationMatrix& fullHierarchyMatrix, Vector<RefPtr<LayerChromium> >& renderSurfaceLayerList, Vector<RefPtr<LayerChromium> >& layerList, int maxTextureSize);
+    static void calculateDrawTransforms(CCLayerImpl*, CCLayerImpl* rootLayer, const WebKit::WebTransformationMatrix& parentMatrix, const WebKit::WebTransformationMatrix& fullHierarchyMatrix, Vector<CCLayerImpl*>& renderSurfaceLayerList, Vector<CCLayerImpl*>& layerList, CCLayerSorter*, int maxTextureSize);
+
+    static void calculateVisibleAndScissorRects(Vector<CCLayerImpl*>& renderSurfaceLayerList, const FloatRect& rootScissorRect);
+    static void calculateVisibleAndScissorRects(Vector<RefPtr<LayerChromium> >& renderSurfaceLayerList, const FloatRect& rootScissorRect);
+
+    // Performs hit testing for a given renderSurfaceLayerList.
+    static CCLayerImpl* findLayerThatIsHitByPoint(const IntPoint& viewportPoint, Vector<CCLayerImpl*>& renderSurfaceLayerList);
+
+    template<typename LayerType> static bool renderSurfaceContributesToTarget(LayerType*, int targetSurfaceLayerID);
+
+    // Returns a layer with the given id if one exists in the subtree starting
+    // from the given root layer (including mask and replica layers).
+    template<typename LayerType> static LayerType* findLayerInSubtree(LayerType* rootLayer, int layerId);
+
+    struct ScrollUpdateInfo {
+        int layerId;
+        IntSize scrollDelta;
+    };
+};
+
+struct CCScrollAndScaleSet {
+    Vector<CCLayerTreeHostCommon::ScrollUpdateInfo> scrolls;
+    float pageScaleDelta;
+};
+
+template<typename LayerType>
+bool CCLayerTreeHostCommon::renderSurfaceContributesToTarget(LayerType* layer, int targetSurfaceLayerID)
+{
+    // A layer will either contribute its own content, or its render surface's content, to
+    // the target surface. The layer contributes its surface's content when both the
+    // following are true:
+    //  (1) The layer actually has a renderSurface, and
+    //  (2) The layer's renderSurface is not the same as the targetSurface.
+    //
+    // Otherwise, the layer just contributes itself to the target surface.
+
+    return layer->renderSurface() && layer->id() != targetSurfaceLayerID;
+}
+
+template<typename LayerType>
+LayerType* CCLayerTreeHostCommon::findLayerInSubtree(LayerType* rootLayer, int layerId)
+{
+    if (rootLayer->id() == layerId)
+        return rootLayer;
+
+    if (rootLayer->maskLayer() && rootLayer->maskLayer()->id() == layerId)
+        return rootLayer->maskLayer();
+
+    if (rootLayer->replicaLayer() && rootLayer->replicaLayer()->id() == layerId)
+        return rootLayer->replicaLayer();
+
+    for (size_t i = 0; i < rootLayer->children().size(); ++i) {
+        if (LayerType* found = findLayerInSubtree(rootLayer->children()[i].get(), layerId))
+            return found;
+    }
+    return 0;
+}
+
+} // namespace WebCore
+
+#endif