Mojo C++ bindings: support enum validation.

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

Index: mojo/public/tools/bindings/generators/cpp_templates/struct_definition.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/struct_definition.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/struct_definition.tmpl
index 6a8254949795698009140db45bd03393bedcc70c..ecb64800289dcf1521b8e9b83f028657faea74b9 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/struct_definition.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/struct_definition.tmpl
@@ -91,6 +91,15 @@
     return false;
 {%- endmacro %}
 
+{#- Validates the specified struct field, which is supposed to be an enum.
+    This macro is expanded by the Validate() method. #}
+{%- macro _validate_enum(struct, packed_field) %}
+{%-   set name = packed_field.field.name %}
+{%-   set kind = packed_field.field.kind %}
+  if (!mojo::internal::ValidateEnum(object->{{name}}))
+    return false;
+{%- endmacro %}
+
 // static
 {{class_name}}* {{class_name}}::New(mojo::internal::Buffer* buf) {
   return new (buf->Allocate(sizeof({{class_name}}))) {{class_name}}();
@@ -146,7 +155,8 @@ bool {{class_name}}::Validate(const void* data,
 {%- for packed_field in struct.packed.packed_fields_in_ordinal_order %}
 {%-   set kind = packed_field.field.kind %}
 {%-   if kind|is_object_kind or kind|is_any_handle_kind or
-         kind|is_interface_kind or kind|is_associated_kind %}
+         kind|is_interface_kind or kind|is_associated_kind or
+         kind|is_enum_kind %}
 {%-     if packed_field.min_version > last_checked_version %}
 {%-       set last_checked_version = packed_field.min_version %}
   if (object->header_.version < {{packed_field.min_version}})
@@ -156,8 +166,10 @@ bool {{class_name}}::Validate(const void* data,
 {{_validate_object(struct, packed_field)}}
 {%-     elif kind|is_any_handle_kind or kind|is_interface_kind %}
 {{_validate_handle(struct, packed_field)}}
-{%-     else %}
+{%-     elif kind|is_associated_kind %}
 {{_validate_associated(struct, packed_field)}}
+{%-     else %}
+{{_validate_enum(struct, packed_field)}}
 {%-     endif %}
 {%-   endif %}
 {%- endfor %}