Move third_party/mojo/src/mojo/public to mojo/public

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

 {%- import "validation_macros.tmpl" as validation_macros %}
 {%- set class_name = union.name ~ "_Data" %}
 {%- set enum_name = union.name ~ "_Tag" -%}
 
 // static
 {{class_name}}* {{class_name}}::New(mojo::internal::Buffer* buf) {
   return new (buf->Allocate(sizeof({{class_name}}))) {{class_name}}();
 }
 
 // static
@@ skipping 76 matching lines @@
 {%-   elif field.kind|is_interface_kind %}
       mojo::internal::DecodeHandle(
           reinterpret_cast<mojo::internal::Interface_Data*>(
               &data.f_{{field.name}}), handles);
 {%-   endif %}
       return;
     }
 {%- endfor %}
   }
 }