Refactor the code distributing width to columns in auto layout tables.

Source/core/layout/TableLayoutAlgorithmAuto.h

Index: Source/core/layout/TableLayoutAlgorithmAuto.h
diff --git a/Source/core/layout/TableLayoutAlgorithmAuto.h b/Source/core/layout/TableLayoutAlgorithmAuto.h
index 079d80c34dc6294a93c8a319981dfaaa76e46de4..47bbb00a73964a35c741eeda591257581a24aed7 100644
--- a/Source/core/layout/TableLayoutAlgorithmAuto.h
+++ b/Source/core/layout/TableLayoutAlgorithmAuto.h
@@ -31,6 +31,22 @@ namespace blink {
 class LayoutTable;
 class LayoutTableCell;
 
+enum LimitToCells {
+    AllCells,
+    NonEmptyCells
+};
+
+enum DistributionMode {
+    ExtraWidth,
+    InitialWidth,
+    LeftOverWidth
+};
+
+enum DistributionDirection {
+    StartToEnd,
+    EndToStart
+};
+
 class TableLayoutAlgorithmAuto final : public TableLayoutAlgorithm {
 public:
     TableLayoutAlgorithmAuto(LayoutTable*);
@@ -46,7 +62,8 @@ private:
     void recalcColumn(unsigned effCol);
 
     int calcEffectiveLogicalWidth();
-    void shrinkCellWidth(const LengthType&, int& available);
+    void shrinkColumnWidth(const LengthType&, int& available);
+    void distributeWidthToColumns(const LengthType&, int& available, int total, LimitToCells = AllCells, DistributionMode = ExtraWidth, DistributionDirection = StartToEnd);
 
     void insertSpanCell(LayoutTableCell*);