Add keyword_subset field template and generate text-decoration-line.

third_party/WebKit/Source/build/scripts/templates/ComputedStyleBase.h.tmpl

 {% from 'macros.tmpl' import license %}
 {% from 'fields/field.tmpl' import encode, getter_expression, setter_expression, declare_storage, fieldwise_compare, fieldwise_copy, fieldwise_diff, fieldwise_pointer_compare_inherited %}
 {% from 'fields/group.tmpl' import declare_field_group_class %}
 {{license()}}
 
 #ifndef ComputedStyleBase_h
 #define ComputedStyleBase_h
 
 #include "core/CoreExport.h"
 #include "core/layout/LayoutTheme.h"
 #include "core/style/ComputedStyleConstants.h"
 #include "core/style/DataRef.h"
 #include "core/style/MemberCopy.h"
 #include "core/style/DataPersistent.h"
 {% for path in include_paths %}
 #include "{{path}}"
 {% endfor %}
 
 {# Each field template has macros that we can call to generate specific
    aspects of the field (e.g. getters, setters).
 #}
 {% import 'fields/keyword.tmpl' as keyword %}
+{% import 'fields/multi_keyword.tmpl' as multi_keyword %}
 {% import 'fields/primitive.tmpl' as primitive %}
 {% import 'fields/monotonic_flag.tmpl' as monotonic_flag %}
 {% import 'fields/storage_only.tmpl' as storage_only %}
 {% import 'fields/external.tmpl' as external %}
 {% import 'fields/pointer.tmpl' as pointer %}
 {% from 'fields/field.tmpl' import encode %}
 {% set field_templates = {
      'keyword': keyword,
+     'multi_keyword': multi_keyword,
      'primitive': primitive,
      'monotonic_flag': monotonic_flag,
      'storage_only': storage_only, 
      'external': external,
      'pointer': pointer
    } %}
 
 namespace blink {
 
 // Forward declaration for diff functions.
@@ skipping 136 matching lines @@
   {% endfor %}
 
   {% for field in computed_style.fields %}
   {{declare_storage(field)}}
   {% endfor %}
 };
 
 } // namespace blink
 
 #endif // ComputedStyleBase_h