[CSS Grid Layout] Add support to place items using named grid lines

Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl

 {% from 'macros.tmpl' import license %}
 {#
     This file is for property handlers which use the templating engine to
     reduce (handwritten) code duplication.
 
     The `properties' dict can be used to access a property's parameters in
     jinja2 templates (i.e. setter, getter, initial, type_name)
 #}
 #include "config.h"
 #include "StyleBuilderFunctions.h"
@@ skipping 428 matching lines @@
     state.style()->setOrderedNamedGrid{{type}}Lines(state.parentStyle()->orderedNamedGrid{{type}}Lines());
 }
 
 {{declare_value_function(property_id)}}
 {
     Vector<GridTrackSize> trackSizes;
     NamedGridLinesMap namedGridLines;
     OrderedNamedGridLines orderedNamedGridLines;
     if (!StyleBuilderConverter::convertGridTrackList(value, trackSizes, namedGridLines, orderedNamedGridLines, state))
         return;
+    const NamedGridAreaMap& namedGridAreas = state.style()->namedGridArea();
+    if (!namedGridAreas.isEmpty())
+        StyleBuilderConverter::createImplicitNamedGridLinesFromGridArea(namedGridAreas, namedGridLines, For{{type}}s);
     state.style()->setGridTemplate{{type}}s(trackSizes);
     state.style()->setNamedGrid{{type}}Lines(namedGridLines);
     state.style()->setOrderedNamedGrid{{type}}Lines(orderedNamedGridLines);
 }
 {% endmacro %}
 {{apply_grid_template('CSSPropertyGridTemplateColumns', 'Column')}}
 {{apply_grid_template('CSSPropertyGridTemplateRows', 'Row')}}
 
 {% macro apply_value_number(property_id, id_for_minus_one) %}
 {{declare_value_function(property_id)}}
@@ skipping 40 matching lines @@
 
         if (shape)
             {{set_value(property)}}(ShapeValue::createShapeValue(shape.release(), cssBox));
         else if (cssBox != BoxMissing)
             {{set_value(property)}}(ShapeValue::createBoxShapeValue(cssBox));
     }
 }
 {% endmacro %}
 {{apply_value_shape('CSSPropertyShapeOutside')}}
 } // namespace WebCore