1 files changed, 63 insertions, 0 deletions
diff --git a/Source/WebCore/page/scrolling/ScrollingStateOverflowScrollingNode.h b/Source/WebCore/page/scrolling/ScrollingStateOverflowScrollingNode.h
new file mode 100644
index 000000000..042bcf87d
--- /dev/null
+++ b/Source/WebCore/page/scrolling/ScrollingStateOverflowScrollingNode.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2014 Apple 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.
+ */
+
+#pragma once
+
+#if ENABLE(ASYNC_SCROLLING) || USE(COORDINATED_GRAPHICS)
+
+#include "ScrollingStateScrollingNode.h"
+
+namespace WebCore {
+
+class ScrollingStateOverflowScrollingNode : public ScrollingStateScrollingNode {
+public:
+    static Ref<ScrollingStateOverflowScrollingNode> create(ScrollingStateTree&, ScrollingNodeID);
+
+    Ref<ScrollingStateNode> clone(ScrollingStateTree&) override;
+
+    virtual ~ScrollingStateOverflowScrollingNode();
+
+    enum ChangedProperty {
+        ScrolledContentsLayer = NumScrollingStateNodeBits
+    };
+
+    // This is a layer with the contents that move.
+    const LayerRepresentation& scrolledContentsLayer() const { return m_scrolledContentsLayer; }
+    WEBCORE_EXPORT void setScrolledContentsLayer(const LayerRepresentation&);
+    
+    void dumpProperties(TextStream&, int indent, ScrollingStateTreeAsTextBehavior) const override;
+
+private:
+    ScrollingStateOverflowScrollingNode(ScrollingStateTree&, ScrollingNodeID);
+    ScrollingStateOverflowScrollingNode(const ScrollingStateOverflowScrollingNode&, ScrollingStateTree&);
+    
+    LayerRepresentation m_scrolledContentsLayer;    
+};
+
+} // namespace WebCore
+
+SPECIALIZE_TYPE_TRAITS_SCROLLING_STATE_NODE(ScrollingStateOverflowScrollingNode, isOverflowScrollingNode())
+
+#endif // ENABLE(ASYNC_SCROLLING) || USE(COORDINATED_GRAPHICS)