[mojo] Expose interface method min_versions

mojo/public/tools/bindings/generators/cpp_templates/interface_declaration.tmpl

Index: mojo/public/tools/bindings/generators/cpp_templates/interface_declaration.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/interface_declaration.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/interface_declaration.tmpl
index c8298d9501f005cd830c1721168d17582f33d429..a90d8ac91572ca82f019e909df44e5a478747079 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/interface_declaration.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/interface_declaration.tmpl
@@ -29,6 +29,13 @@ class {{export_attribute}} {{interface.name}}
   using ResponseValidator_ = mojo::PassThroughFilter;
 {%- endif %}
 
+{#--- Metadata #}
+  enum MethodMinVersions : uint32_t {
+{%- for method in interface.methods %}
+    k{{method.name}}MinVersion = {{method.min_version|default(0, true)}},
+{%- endfor %}
+  };
+
 {#--- Enums #}
 {%- for enum in interface.enums %}
   using {{enum.name}} = {{enum|get_name_for_kind(flatten_nested_kind=True)}};