Raster display item lists via a visual rect RTree.

third_party/WebKit/Source/core/layout/LayoutTableCell.cpp

Index: third_party/WebKit/Source/core/layout/LayoutTableCell.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutTableCell.cpp b/third_party/WebKit/Source/core/layout/LayoutTableCell.cpp
index e6fa7438ee5c23834575753fa966a04a9345cd2e..33b681525502d9ed4ab2d2165cb8279af75d899a 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTableCell.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutTableCell.cpp
@@ -360,13 +360,13 @@ LayoutRect LayoutTableCell::localOverflowRectForPaintInvalidation() const
     return LayoutRect(-location.x(), -location.y(), location.x() + std::max(size().width() + right, selfVisualOverflowRect.maxX()), location.y() + std::max(size().height() + bottom, selfVisualOverflowRect.maxY()));
 }
 
-bool LayoutTableCell::mapToVisualRectInAncestorSpace(const LayoutBoxModelObject* ancestor, LayoutRect& r, VisualRectFlags visualRectFlags) const
+bool LayoutTableCell::mapToVisualRectInAncestorSpace(const LayoutBoxModelObject* ancestor, LayoutRect& rect, VisualRectFlags visualRectFlags) const
 {
     if (ancestor == this)
         return true;
     if (parent())
-        r.moveBy(-parentBox()->location()); // Rows are in the same coordinate space, so don't add their offset in.
-    return LayoutBlockFlow::mapToVisualRectInAncestorSpace(ancestor, r, visualRectFlags);
+        rect.moveBy(-parentBox()->topLeftLocation());
+    return LayoutBlockFlow::mapToVisualRectInAncestorSpace(ancestor, rect, visualRectFlags);
 }
 
 int LayoutTableCell::cellBaselinePosition() const