Allow counter-reset/increment: none.

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

 {% from "macros.tmpl" import lower_first -%}
 
 {#
     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)
 -#}
 
@@ skipping 294 matching lines @@
     typedef CounterDirectiveMap::iterator Iterator;
     Iterator end = parentMap.end();
     for (Iterator it = parentMap.begin(); it != end; ++it) {
         CounterDirectives& directives = map.add(it->key, CounterDirectives()).iterator->value;
         directives.inherit{{action}}(it->value);
     }
 }
 
 {{ declare_value_function(property_id) }}
 {
-    if (!value->isValueList())
-        return;
-
-    CSSValueList* list = toCSSValueList(value);
-
     CounterDirectiveMap& map = state.style()->accessCounterDirectives();
     typedef CounterDirectiveMap::iterator Iterator;
 
     Iterator end = map.end();
     for (Iterator it = map.begin(); it != end; ++it)
         it->value.clear{{action}}();
 
+    if (!value->isValueList()) {
+        ASSERT(value->isPrimitiveValue() && toCSSPrimitiveValue(value)->getValueID() == CSSValueNone);
+        return;
+    }
+
+    CSSValueList* list = toCSSValueList(value);
+
     int length = list ? list->length() : 0;
     for (int i = 0; i < length; ++i) {
         CSSValue* currValue = list->itemWithoutBoundsCheck(i);
         if (!currValue->isPrimitiveValue())
             continue;
 
         Pair* pair = toCSSPrimitiveValue(currValue)->getPairValue();
         if (!pair || !pair->first() || !pair->second())
             continue;
 
@@ skipping 168 matching lines @@
     } else if (value->isImageValue()) {
         {{ set_value(property) }}(ShapeValue::createImageValue(state.styleImage({{property_id}}, value)));
     }
 }
 {%- endmacro %}
 
 {{ apply_value_shape("CSSPropertyShapeInside") }}
 {{ apply_value_shape("CSSPropertyShapeOutside") }}
 
 } // namespace WebCore