[css-grid] Store lines instead of tracks in GridResolvedPosition

third_party/WebKit/Source/core/style/GridResolvedPosition.h

Index: third_party/WebKit/Source/core/style/GridResolvedPosition.h
diff --git a/third_party/WebKit/Source/core/style/GridResolvedPosition.h b/third_party/WebKit/Source/core/style/GridResolvedPosition.h
index 184d312ccdbe60f2a31f8dec2b3a2933f63f14c0..4ac11e70dcb3918d2610412d7ab89548c94fe420 100644
--- a/third_party/WebKit/Source/core/style/GridResolvedPosition.h
+++ b/third_party/WebKit/Source/core/style/GridResolvedPosition.h
@@ -26,24 +26,11 @@ enum GridTrackSizingDirection {
     ForRows
 };
 
-// This class represents an index into one of the dimensions of the grid array.
+// This class represents a line index into one of the dimensions of the grid array.
 // Wraps a size_t integer just for the purpose of knowing what we manipulate in the grid code.
 class GridResolvedPosition {
     DISALLOW_NEW();
 public:
-    static GridResolvedPosition adjustGridPositionForAfterEndSide(size_t resolvedPosition)
-    {
-        return resolvedPosition ? GridResolvedPosition(resolvedPosition - 1) : GridResolvedPosition(0);
-    }
-
-    static GridResolvedPosition adjustGridPositionForSide(size_t resolvedPosition, GridPositionSide side)
-    {
-        // An item finishing on the N-th line belongs to the N-1-th cell.
-        if (side == ColumnEndSide || side == RowEndSide)
-            return adjustGridPositionForAfterEndSide(resolvedPosition);
-
-        return GridResolvedPosition(resolvedPosition);
-    }
 
     static bool isValidNamedLineOrArea(const String& lineName, const ComputedStyle&, GridPositionSide);
     static GridPositionSide initialPositionSide(GridTrackSizingDirection);
@@ -61,14 +48,6 @@ public:
     {
     }
 
-    GridResolvedPosition(const GridPosition& position, GridPositionSide side)
-    {
-        ASSERT(position.integerPosition());
-        size_t integerPosition = position.integerPosition() - 1;
-
-        m_integerPosition = adjustGridPositionForSide(integerPosition, side).toInt();
-    }
-
     GridResolvedPosition& operator*()
     {
         return *this;
@@ -120,6 +99,11 @@ public:
         return GridResolvedPosition(m_integerPosition + 1);
     }
 
+    GridResolvedPosition prev() const
+    {
+        return GridResolvedPosition(m_integerPosition > 0 ? m_integerPosition - 1 : 0);
+    }
+
     static size_t explicitGridColumnCount(const ComputedStyle&);
     static size_t explicitGridRowCount(const ComputedStyle&);