[CSS Shapes] Add parsing support for gradients

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 460 matching lines @@
 {{apply_value_number('CSSPropertyInternalMarqueeRepetition', 'CSSValueInfinite')}}
 
 {% macro apply_value_shape(property_id) %}
 {{declare_value_function(property_id)}}
 {
     {% set property = properties[property_id] %}
     if (value->isPrimitiveValue()) {
         CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
         if (primitiveValue->getValueID() == CSSValueAuto)
             {{set_value(property)}}(nullptr);
-    } else if (value->isImageValue() || value->isImageSetValue()) {
+    } else if (value->isImageValue() || value->isImageGeneratorValue() || value->isImageSetValue()) {
         {{set_value(property)}}(ShapeValue::createImageValue(state.styleImage({{property_id}}, value)));
     } else if (value->isValueList()) {
         RefPtr<BasicShape> shape;
         CSSBoxType cssBox = BoxMissing;
         CSSValueList* valueList = toCSSValueList(value);
         for (unsigned i = 0; i < valueList->length(); ++i) {
             CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(valueList->itemWithoutBoundsCheck(i));
             if (primitiveValue->isShape())
                 shape = basicShapeForValue(state, primitiveValue->getShapeValue());
             else if (primitiveValue->getValueID() == CSSValueContentBox
                 || primitiveValue->getValueID() == CSSValueBorderBox
                 || primitiveValue->getValueID() == CSSValuePaddingBox
                 || primitiveValue->getValueID() == CSSValueMarginBox)
                 cssBox = CSSBoxType(*primitiveValue);
             else
                 return;
         }
 
         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