Remove CSSCompositing

sky/engine/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 398 matching lines @@
         currChild = currChild->next();
     }
     while (currChild) {
         /* Reset all remaining layers to not have the property set. */
         currChild->clear{{fill_type}}();
         currChild = currChild->next();
     }
 }
 {% endmacro %}
 {{apply_fill_layer('CSSPropertyBackgroundAttachment', 'Attachment')}}
-{{apply_fill_layer('CSSPropertyBackgroundBlendMode', 'BlendMode')}}
 {{apply_fill_layer('CSSPropertyBackgroundClip', 'Clip')}}
 {{apply_fill_layer('CSSPropertyBackgroundImage', 'Image')}}
 {{apply_fill_layer('CSSPropertyBackgroundOrigin', 'Origin')}}
 {{apply_fill_layer('CSSPropertyBackgroundPositionX', 'XPosition')}}
 {{apply_fill_layer('CSSPropertyBackgroundPositionY', 'YPosition')}}
 {{apply_fill_layer('CSSPropertyBackgroundRepeatX', 'RepeatX')}}
 {{apply_fill_layer('CSSPropertyBackgroundRepeatY', 'RepeatY')}}
 {{apply_fill_layer('CSSPropertyBackgroundSize', 'Size')}}
 {{apply_fill_layer('CSSPropertyMaskSourceType', 'MaskSourceType')}}
 {{apply_fill_layer('CSSPropertyWebkitBackgroundComposite', 'Composite')}}
@@ skipping 44 matching lines @@
         state.style()->set{{alignment_type}}OverflowAlignment(*pairValue->second());
     } else {
         state.style()->set{{alignment_type}}(*primitiveValue);
     }
 }
 {% endmacro %}
 {{apply_alignment('CSSPropertyAlignItems', 'AlignItems')}}
 {{apply_alignment('CSSPropertyAlignSelf', 'AlignSelf')}}
 
 } // namespace blink