Split populateGlyphLines function from computeLineOffset.

Runtime/ui/txt/paragraph.cs

                 maxWordWidth = tMaxWordWidth;
             }
 
+            this._computeLineOffset(lineNumber, paintRecords, ref yOffset, ref preMaxDescent);
-            this._computeLineOffset(lineNumber, lineGlyphPositions, paintRecords, ref yOffset, ref preMaxDescent);
+            this._populateGlyphLines(lineNumber, lineGlyphPositions);
             this._addPaintRecordsWithOffset(paintRecords, lineXOffset, yOffset);
         }
 
             }
         }
 
-        void _computeLineOffset(int lineNumber,
-            GlyphPosition[] lineGlyphPositions,
-            PaintRecord[] paintRecords,
-            ref float yOffset, ref float preMaxDescent) {
+        void _populateGlyphLines(int lineNumber, GlyphPosition[] lineGlyphPositions) {
+        }
+
+        void _computeLineOffset(int lineNumber, PaintRecord[] paintRecords, ref float yOffset, ref float preMaxDescent) {
 
             float maxLineSpacing = 0;
             float maxDescent = 0;