Fold ScrollingCoordinatorChromium into ScrollingCoordinator and devirtualize

Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.mm

Index: Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.mm
diff --git a/Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.mm b/Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.mm
deleted file mode 100644
index 9678ec8e47a26456ef43c4b6553cb77fc5cc9b0b..0000000000000000000000000000000000000000
--- a/Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.mm
+++ /dev/null
@@ -1,92 +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.
- */
-
-#include "config.h"
-#include "ScrollingTreeStickyNode.h"
-
-#if ENABLE(THREADED_SCROLLING)
-
-#include "ScrollingStateStickyNode.h"
-#include "ScrollingTree.h"
-
-namespace WebCore {
-
-PassOwnPtr<ScrollingTreeStickyNode> ScrollingTreeStickyNode::create(ScrollingTree* scrollingTree, ScrollingNodeID nodeID)
-{
-    return adoptPtr(new ScrollingTreeStickyNode(scrollingTree, nodeID));
-}
-
-ScrollingTreeStickyNode::ScrollingTreeStickyNode(ScrollingTree* scrollingTree, ScrollingNodeID nodeID)
-    : ScrollingTreeNode(scrollingTree, nodeID)
-{
-}
-
-ScrollingTreeStickyNode::~ScrollingTreeStickyNode()
-{
-}
-
-void ScrollingTreeStickyNode::updateBeforeChildren(ScrollingStateNode* stateNode)
-{
-    ScrollingStateStickyNode* stickyStateNode = toScrollingStateStickyNode(stateNode);
-
-    if (stickyStateNode->hasChangedProperty(ScrollingStateNode::ScrollLayer))
-        m_layer = stickyStateNode->platformScrollLayer();
-
-    if (stateNode->hasChangedProperty(ScrollingStateStickyNode::ViewportConstraints))
-        m_constraints = stickyStateNode->viewportConstraints();
-}
-
-static inline CGPoint operator*(CGPoint& a, const CGSize& b)
-{
-    return CGPointMake(a.x * b.width, a.y * b.height);
-}
-
-void ScrollingTreeStickyNode::parentScrollPositionDidChange(const IntRect& viewportRect, const FloatSize& cumulativeDelta)
-{
-    FloatPoint layerPosition = m_constraints.layerPositionForViewportRect(viewportRect);
-
-    // FIXME: Subtracting the cumulativeDelta is not totally sufficient to get the new position right for nested
-    // sticky objects. We probably need a way to modify the absoluteContainingBlockRect in the ViewportContraints
-    // to get this right in all cases.
-    layerPosition -= cumulativeDelta;
-
-    CGRect layerBounds = [m_layer.get() bounds];
-    CGPoint anchorPoint = [m_layer.get() anchorPoint];
-    CGPoint newPosition = layerPosition - m_constraints.alignmentOffset() + anchorPoint * layerBounds.size;
-    [m_layer.get() setPosition:newPosition];
-
-    if (!m_children)
-        return;
-
-    FloatSize newDelta = layerPosition - m_constraints.layerPositionAtLastLayout() + cumulativeDelta;
-
-    size_t size = m_children->size();
-    for (size_t i = 0; i < size; ++i)
-        m_children->at(i)->parentScrollPositionDidChange(viewportRect, newDelta);
-}
-
-} // namespace WebCore
-
-#endif // ENABLE(THREADED_SCROLLING)