Negative row height when cell has percentage height.

Source/core/layout/LayoutTableSection.cpp

Index: Source/core/layout/LayoutTableSection.cpp
diff --git a/Source/core/layout/LayoutTableSection.cpp b/Source/core/layout/LayoutTableSection.cpp
index 63e6a0815f5e165059929d22ba614ee60cbeb0a4..13715dbd10623afcc0edecbfdecc50b7cad9f90b 100644
--- a/Source/core/layout/LayoutTableSection.cpp
+++ b/Source/core/layout/LayoutTableSection.cpp
@@ -322,7 +322,7 @@ void LayoutTableSection::distributeExtraRowSpanHeightToPercentRows(LayoutTableCe
                 // FIXME: Note that this is wrong if we have a percentage above 100% and may make us grow
                 // above the available space.
 
-                toAdd = std::min(toAdd, extraRowSpanningHeight);
+                toAdd = std::max(std::min(toAdd, extraRowSpanningHeight), 0);
                 accumulatedPositionIncrease += toAdd;
                 extraRowSpanningHeight -= toAdd;
                 percent -= m_grid[row].logicalHeight.percent();