Mojo C++ bindings: allow StructTraits to return handle or interface types as value.

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

Index: mojo/public/tools/bindings/generators/cpp_templates/struct_macros.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/struct_macros.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/struct_macros.tmpl
index f95b33d4452cbf2de359ab78e1bd89938a87faa6..c59f317880d981a58a00df6e3d2d699d7a3e297e 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/struct_macros.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/struct_macros.tmpl
@@ -66,13 +66,17 @@
 {%-   set name = pf.field.name %}
 {%-   set kind = pf.field.kind %}
 {%-   set serializer_type = kind|unmapped_type_for_serializer %}
-{%-   if kind|is_object_kind %}
+
+{%-   if kind|is_object_kind or kind|is_any_handle_or_interface_kind %}
 {%-     set original_input_field = input_field_pattern|format(name) %}
 {%-     set input_field = "in_%s"|format(name) if input_may_be_temp
                                                else original_input_field %}
 {%-     if input_may_be_temp %}
   decltype({{original_input_field}}) in_{{name}} = {{original_input_field}};
 {%-     endif %}
+{%-   endif %}
+
+{%-   if kind|is_object_kind %}
 {%-     if kind|is_array_kind or kind|is_map_kind %}

[Peng, 2016/07/06 18:05:26]

This code is totally unreadable to me. Maybe ask other to take a look.

[yzshen1, 2016/07/06 18:07:25]

I am the author of most of the code in this folder. :)
If you think it does what you want, would you please LG this CL.

   typename decltype({{output}}->{{name}})::BaseType* {{name}}_ptr;
   const mojo::internal::ContainerValidateParams {{name}}_validate_params(