Generate getters/setters for some fields on groups in ComputedStyle

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

-{% macro decl_methods(field) -%}
+{% from 'fields/field.tmpl' import encode, decode, getter_expression, setter_expression, return_type %}
+{% macro decl_public_methods(field) -%}
 // Getters and setters not generated
 {%- endmacro %}
+{% macro decl_protected_methods(field) -%}
+{% if field.is_bit_field != 1 %}
+const {{return_type(field)}} {{field.internal_getter_method_name}}() const {
+  return {{decode(field, getter_expression(field))}};
+}
+{{field.type_name}}& {{field.internal_mutable_method_name}}() {
+  return {{decode(field, getter_expression(field))}};
+}
+{% else %}
+{{return_type(field)}} {{field.internal_getter_method_name}}() const {
+  return {{decode(field, getter_expression(field))}};
+}
+{% endif %}
+void {{field.internal_setter_method_name}}(const {{field.type_name}}& v) {
+  {{setter_expression(field)}} = {{encode(field, "v")}};
+}
+{%- endmacro %}
+