Fix table cell background painting

third_party/WebKit/Source/core/layout/LayoutTable.h

Index: third_party/WebKit/Source/core/layout/LayoutTable.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutTable.h b/third_party/WebKit/Source/core/layout/LayoutTable.h
index f34d1286c0e8f7ed02481e5df702d6b0a89314a6..3e2f0de6bc3b2ccf5266e1e5a8afc548134c11ef 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTable.h
+++ b/third_party/WebKit/Source/core/layout/LayoutTable.h
@@ -251,6 +251,7 @@ public:
 
     // This function returns 0 if the table has no non-empty sections.
     LayoutTableSection* topNonEmptySection() const;
+    LayoutTableSection* bottomNonEmptySection() const;
 
     unsigned lastEffectiveColumnIndex() const { return numEffectiveColumns() - 1; }
 
@@ -336,6 +337,10 @@ public:
         return slowColElementAtAbsoluteColumn(absoluteColumnIndex);
     }
 
+    // Maps LayoutTableCol => absoluteColumnIndex,
+    // an inverse of slowColElementAtAbsoluteColumn.
+    unsigned colElementToAbsoluteColumn(const LayoutTableCol*) const;
+
     bool needsSectionRecalc() const { return m_needsSectionRecalc; }
     void setNeedsSectionRecalc()
     {