[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..f2fa9acb362125f875b24daa9a542745d930a8b5 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 +29,16 @@ class {{export_attribute}} {{interface.name}}
   using ResponseValidator_ = mojo::PassThroughFilter;
 {%- endif %}
 
+{#--- Metadata #}
+  enum kMethodIndices : uint32_t {

[yzshen1, 2016/12/22 18:53:28]

For Foo.Bar(), we already have "const uint32_t internal::kFoo_Bar_Name" defined.
Can we merge the two?

+{%- for method in interface.methods %}
+    k{{method.name}}MethodIndex,
+{%- endfor %}
+    kMethodMetadataSize
+  };
+
+  static const mojo::MethodMetadata kMethodMetadata[];
+
 {#--- Enums #}
 {%- for enum in interface.enums %}
   using {{enum.name}} = {{enum|get_name_for_kind(flatten_nested_kind=True)}};