Make the fuchsia mojo/public repo the source of truth.

mojo/public/tools/bindings/generators/java_templates/enum_definition.tmpl

-{%- macro enum_value(enum, field, index) -%}
-{%- if field.value -%}
-(int) ({{field.value|expression_to_text('i32')}})
-{%- elif index == 0 -%}
-0
-{%- else -%}
-{{enum.fields[index - 1]|name}} + 1
-{%- endif -%}
-{%- endmacro -%}
-
-{%- macro enum_def(enum, top_level) -%}
-public {{ 'static ' if not top_level }}final class {{enum|name}} {
-
-{% for field in enum.fields %}
-    public static final int {{field|name}} = {{enum_value(enum, field, loop.index0)}};
-{% endfor %}
-
-    private {{enum|name}}() {}
-
-}
-{%- endmacro -%}