refactor the setting of continous borders in the border collapse computation bug 452319 r=fantasia sr=roc

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layout/tables/nsTableFrame.h

@@ -303,6 +303,8 @@ public:
    *  see nsTablePainter about continuous borders
    */
   nscoord GetContinuousLeftBCBorderWidth() const;
+  void SetContinuousLeftBCBorderWidth(nscoord aValue);
+
   friend class nsDelayedCalcBCBorders;
   
   void SetBCDamageArea(const nsRect& aValue);
@@ -978,6 +980,11 @@ nsTableFrame::GetContinuousLeftBCBorderWidth() const
   return BC_BORDER_RIGHT_HALF_COORD(aPixelsToTwips, mBits.mLeftContBCBorder);
 }
 
+inline void nsTableFrame::SetContinuousLeftBCBorderWidth(nscoord aValue)
+{
+  mBits.mLeftContBCBorder = (unsigned) aValue;
+}
+
 class nsTableIterator
 {
 public: