Generate subgroup StyleSurroundData in ComputedStyle.

third_party/WebKit/Source/build/scripts/templates/fields/field.tmpl

Index: third_party/WebKit/Source/build/scripts/templates/fields/field.tmpl
diff --git a/third_party/WebKit/Source/build/scripts/templates/fields/field.tmpl b/third_party/WebKit/Source/build/scripts/templates/fields/field.tmpl
index 8790c220a74458dfa70c7a5238d35b8e99f6a1ab..e4cc5ed447e9bd66ee8d12bb75b223e0146648ea 100644
--- a/third_party/WebKit/Source/build/scripts/templates/fields/field.tmpl
+++ b/third_party/WebKit/Source/build/scripts/templates/fields/field.tmpl
@@ -14,6 +14,22 @@ static_cast<{{field.type_name}}>({{value}})
 {%- endif %}
 {% endmacro %}
 
+{% macro getter_expression(field) %}
+{% if field.group_member_name -%}
+{{field.group_member_name}}->{{field.name}}
+{%- else -%}
+{{field.name}}
+{%- endif %}
+{% endmacro %}
+
+{% macro setter_expression(field) %}
+{% if field.group_member_name -%}
+{{field.group_member_name}}.Access()->{{field.name}}
+{%- else -%}
+{{field.name}}
+{%- endif %}
+{% endmacro %}
+
 {% macro return_type(field) %}
 {% if field.is_bit_field -%}
 {{field.type_name}}
@@ -21,3 +37,11 @@ static_cast<{{field.type_name}}>({{value}})
 const {{field.type_name}}&
 {%- endif %}
 {% endmacro %}
+
+{% macro declare_storage(field) %}
+{% if field.is_bit_field %}
+unsigned {{field.name}} : {{field.size}}; // {{field.type_name}}
+{%- else %}
+{{field.type_name}} {{field.name}};
+{%- endif %}
+{% endmacro %}