Mojo C++ bindings: support passing associated interface pointers/requests in method parameter lists…

mojo/public/cpp/bindings/associated_binding.h

Index: mojo/public/cpp/bindings/associated_binding.h
diff --git a/mojo/public/cpp/bindings/associated_binding.h b/mojo/public/cpp/bindings/associated_binding.h
index bd6b203b8c8bcd56b6daf519cd2f8737b71ed23b..b6b7cd1098cf55bf19dea7a2ca4fd4648f217443 100644
--- a/mojo/public/cpp/bindings/associated_binding.h
+++ b/mojo/public/cpp/bindings/associated_binding.h
@@ -79,9 +79,10 @@ class AssociatedBinding {
     endpoint_client_.reset(new internal::InterfaceEndpointClient(
         handle.Pass(), &stub_,
         make_scoped_ptr(new typename Interface::RequestValidator_())));
-
     endpoint_client_->set_connection_error_handler(
         [this]() { connection_error_handler_.Run(); });
+
+    stub_.serialization_context()->router = endpoint_client_->router();
   }
 
   // Closes the associated interface. Puts this object into a state where it can