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

mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl

Index: mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl
index 582ecc84dbe57aa0ccc333e0ec167632cc2acbd6..38b203dc5ea29d757da8ed66ca4a8670f418c6f8 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl
@@ -30,6 +30,10 @@
 #include "mojo/public/cpp/bindings/no_interface.h"
 #include "mojo/public/cpp/bindings/string.h"
 #include "mojo/public/cpp/bindings/struct_ptr.h"
+{%- if variant %}
+#include "{{module.path}}.h"
+{%- endif %}
+
 #include "{{module.path}}{{variant_suffix}}-internal.h"
 {%- for import in imports %}
 #include "{{import.module.path}}{{variant_suffix}}.h"