[mojo] Add Mojo bindings support for IPC::ParamTraits

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

Index: mojo/public/tools/bindings/generators/cpp_templates/wrapper_class_definition.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/wrapper_class_definition.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/wrapper_class_definition.tmpl
index 8c61c86ab18527ffdcb80e789d8aee1a44c4e6a2..0b7823a7d505353295747159d13b4c07911efd2b 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/wrapper_class_definition.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/wrapper_class_definition.tmpl
@@ -25,7 +25,9 @@
 {{struct.name}}Ptr {{struct.name}}::Clone() const {
   {{struct.name}}Ptr rv(New());
 {%-   for field in struct.fields %}
-{%-     if field.kind|is_object_kind and not field.kind|is_string_kind %}
+{%-     if field.kind|is_native_kind %}
+  NOTREACHED() << "Cloning not supported when using native types.";
+{%-     elif field.kind|is_object_kind and not field.kind|is_string_kind %}
   rv->{{field.name}} = {{field.name}}.Clone();
 {%-     else %}
   rv->{{field.name}} = {{field.name}};
@@ -37,8 +39,12 @@
 
 bool {{struct.name}}::Equals(const {{struct.name}}& other) const {
 {%-  for field in struct.fields %}
+{%-    if field.kind|is_native_kind %}
+  NOTREACHED() << "Equality testing not supported when using native types.";
+{%-    else %}
   if (!mojo::internal::ValueTraits<{{field.kind|cpp_wrapper_type}}>::Equals(this->{{field.name}}, other.{{field.name}}))
     return false;
+{%-    endif %}
 {%-  endfor %}
   return true;
 }