[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..0bd3612ee7bb1d32b684282f8fafc458da4cf8df 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 kMethodMinVersions : uint32_t {

[yzshen1, 2016/12/22 21:52:19]

Does it make sense to use
  static const uint32_t k{{method.name}}MinVersion = xx;
  ...

[Luis Héctor Chávez, 2016/12/22 21:54:03]

I'm following the advice on this thread:
https://groups.google.com/a/chromium.org/forum/#!searchin/chromium-dev/ODR%7C...

[yzshen1, 2016/12/22 22:19:08]

Thanks for pointing me there. Yeah, ODR... :)

Please change the name of the enum to MethodMinVersions (i.e., removing "k").

+{%- 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)}};