[CSS Grid Layout] Add support for named grid areas

Source/core/rendering/RenderGrid.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 957 matching lines @@
     size_t namedGridLineIndex;
     if (position.isPositive())
         namedGridLineIndex = std::min<size_t>(position.integerPosition(), it->value.size()) - 1;
     else
         namedGridLineIndex = std::max<int>(it->value.size() - abs(position.integerPosition()), 0);
     return adjustGridPositionForSide(it->value[namedGridLineIndex], side);
 }
 
 size_t RenderGrid::resolveGridPositionFromStyle(const GridPosition& position, GridPositionSide side) const
 {
-    // FIXME: Handle other values for grid-{row,column} like ranges or line names.
     switch (position.type()) {
     case ExplicitPosition: {
         ASSERT(position.integerPosition());
 
         if (!position.namedGridLine().isNull())
             return resolveNamedGridLinePositionFromStyle(position, side);
 
         // Handle <integer> explicit position.
         if (position.isPositive())
             return adjustGridPositionForSide(position.integerPosition() - 1, side);
 
         size_t resolvedPosition = abs(position.integerPosition()) - 1;
         const size_t endOfTrack = explicitGridSizeForSide(side);
 
         // Per http://lists.w3.org/Archives/Public/www-style/2013Mar/0589.html, we clamp negative value to the first line.
         if (endOfTrack < resolvedPosition)
             return 0;
 
         return adjustGridPositionForSide(endOfTrack - resolvedPosition, side);
     }
     case NamedGridAreaPosition:
-        // FIXME: Support resolving named grid area (crbug.com/258092).
+    {
+        NamedGridAreaMap::const_iterator it = style()->namedGridArea().find(position.namedGridLine());
+        // Unknown grid area should have been computed to 'auto' by now.
+        ASSERT(it != style()->namedGridArea().end());
+        const GridCoordinate& gridAreaCoordinate = it->value;
+        switch (side) {
+        case ColumnStartSide:
+            return gridAreaCoordinate.columns.initialPositionIndex;
+        case ColumnEndSide:
+            return gridAreaCoordinate.columns.finalPositionIndex;
+        case RowStartSide:
+            return gridAreaCoordinate.rows.initialPositionIndex;
+        case RowEndSide:
+            return gridAreaCoordinate.rows.finalPositionIndex;
+        }
+        ASSERT_NOT_REACHED();
         return 0;
+    }
     case AutoPosition:
     case SpanPosition:
         // 'auto' and span depend on the opposite position for resolution (e.g. grid-row: auto / 1 or grid-column: span 3 / "myHeader").
         ASSERT_NOT_REACHED();
         return 0;
     }
     ASSERT_NOT_REACHED();
     return 0;
 }
 
@@ skipping 109 matching lines @@
     if (isOutOfFlowPositioned())
         return "RenderGrid (positioned)";
     if (isAnonymous())
         return "RenderGrid (generated)";
     if (isRelPositioned())
         return "RenderGrid (relative positioned)";
     return "RenderGrid";
 }
 
 } // namespace WebCore