Mojo C++ bindings: add a new mode to generator to use native STL/WTF types

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

 {%- import "interface_macros.tmpl" as interface_macros %}
 {%- import "struct_macros.tmpl" as struct_macros %}
 
 {%- set class_name = interface.name %}
 {%- set proxy_name = interface.name ~ "Proxy" %}
 {%- set namespace_as_string = "%s"|format(namespace|replace(".","::")) %}
 
 {%- macro alloc_params(struct, params, message, serialization_context,
                        description) %}
   ({{serialization_context}})->handles.Swap(({{message}})->mutable_handles());
@@ skipping 247 matching lines @@
           "{{class_name}}::{{method.name}}() was never run.");
     }
 #endif
     // If the Callback was dropped then deleting the responder will close
     // the pipe so the calling application knows to stop waiting for a reply.
     delete responder_;
   }
 
   void Run(
       {{interface_macros.declare_responder_params(
-          "in_", method.response_parameters, for_blink)}});
+          "in_", method.response_parameters, for_blink,
+          use_new_wrapper_types)}});
 
   uint64_t request_id_;
   bool is_sync_;
   mojo::MessageReceiverWithStatus* responder_;
   // TODO(yzshen): maybe I should use a ref to the original one?
   mojo::internal::SerializationContext serialization_context_;
 
   DISALLOW_COPY_AND_ASSIGN({{class_name}}_{{method.name}}_ProxyToResponder);
 };
 
 void {{class_name}}_{{method.name}}_ProxyToResponder::Run(
     {{interface_macros.declare_responder_params(
-        "in_", method.response_parameters, for_blink)}}) {
+        "in_", method.response_parameters, for_blink,
+        use_new_wrapper_types)}}) {
   {{struct_macros.get_serialized_size(response_params_struct, "in_%s",
                                       "&serialization_context_")}}
   mojo::internal::ResponseMessageBuilder builder(
       {{message_name}}, size, request_id_,
       is_sync_ ? mojo::Message::kFlagIsSync : 0);
   {{build_message(response_params_struct, "in_%s", params_description,
                   "&serialization_context_")}}
   bool ok = responder_->Accept(builder.message());
   ALLOW_UNUSED_LOCAL(ok);
   // TODO(darin): !ok returned here indicates a malformed message, and that may
@@ skipping 170 matching lines @@
       break;
   }
 
   // Unrecognized message.
   ReportValidationError(
       &validation_context,
       mojo::internal::VALIDATION_ERROR_MESSAGE_HEADER_UNKNOWN_METHOD);
   return false;
 }
 {%- endif -%}