Fold ScrollingCoordinatorChromium into ScrollingCoordinator and devirtualize

Source/WebCore/page/scrolling/ScrollingStateTree.h

Index: Source/WebCore/page/scrolling/ScrollingStateTree.h
diff --git a/Source/WebCore/page/scrolling/ScrollingStateTree.h b/Source/WebCore/page/scrolling/ScrollingStateTree.h
deleted file mode 100644
index 5d6d82b75bb58d22261cb0179aa4c383f77bbd2c..0000000000000000000000000000000000000000
--- a/Source/WebCore/page/scrolling/ScrollingStateTree.h
+++ /dev/null
@@ -1,84 +0,0 @@
-/*
- * Copyright (C) 2012 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.
- */
-
-#ifndef ScrollingStateTree_h
-#define ScrollingStateTree_h
-
-#if ENABLE(THREADED_SCROLLING)
-
-#include "ScrollingStateScrollingNode.h"
-#include <wtf/OwnPtr.h>
-#include <wtf/PassOwnPtr.h>
-#include <wtf/RefPtr.h>
- 
-namespace WebCore {
- 
-// The ScrollingStateTree is a tree that managed ScrollingStateNodes. The nodes keep track of the current
-// state of scrolling related properties. Whenever any properties change, the scrolling coordinator
-// will be informed and will schedule a timer that will clone the new state tree and send it over to
-// the scrolling thread, avoiding locking. 
-
-class ScrollingStateTree {
-    friend class ScrollingStateNode;
-public:
-    
-    static PassOwnPtr<ScrollingStateTree> create();
-    ~ScrollingStateTree();
-
-    ScrollingStateScrollingNode* rootStateNode() const { return m_rootStateNode.get(); }
-    ScrollingStateNode* stateNodeForID(ScrollingNodeID);
-
-    ScrollingNodeID attachNode(ScrollingNodeType, ScrollingNodeID, ScrollingNodeID parentID);
-    void detachNode(ScrollingNodeID);
-    void clear();
-    
-    const Vector<ScrollingNodeID>& removedNodes() const { return m_nodesRemovedSinceLastCommit; }
-
-    // Copies the current tree state and clears the changed properties mask in the original.
-    PassOwnPtr<ScrollingStateTree> commit();
-
-    void setHasChangedProperties(bool changedProperties) { m_hasChangedProperties = changedProperties; }
-    bool hasChangedProperties() const { return m_hasChangedProperties; }
-
-private:
-    ScrollingStateTree();
-
-    void setRootStateNode(PassOwnPtr<ScrollingStateScrollingNode> rootStateNode) { m_rootStateNode = rootStateNode; }
-    void removeNode(ScrollingStateNode*);
-    void didRemoveNode(ScrollingNodeID);
-
-    PassOwnPtr<ScrollingStateTree> clone();
-
-    HashMap<ScrollingNodeID, ScrollingStateNode*> m_stateNodeMap;
-    OwnPtr<ScrollingStateScrollingNode> m_rootStateNode;
-    Vector<ScrollingNodeID> m_nodesRemovedSinceLastCommit;
-    bool m_hasChangedProperties;
-};
-
-} // namespace WebCore
-
-#endif // ENABLE(THREADED_SCROLLING)
-
-#endif // ScrollingStateTree_h