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

mojo/public/cpp/bindings/lib/associated_interface_ptr_state.h

Index: mojo/public/cpp/bindings/lib/associated_interface_ptr_state.h
diff --git a/mojo/public/cpp/bindings/lib/associated_interface_ptr_state.h b/mojo/public/cpp/bindings/lib/associated_interface_ptr_state.h
index 41fec8981c6bd5ba6875739de4b8b9f6063892d8..2a111eaf190e4e7927b9978c126f5353d2feb930 100644
--- a/mojo/public/cpp/bindings/lib/associated_interface_ptr_state.h
+++ b/mojo/public/cpp/bindings/lib/associated_interface_ptr_state.h
@@ -80,6 +80,7 @@ class AssociatedInterfacePtrState {
         AssociatedInterfacePtrInfoHelper::PassHandle(&info), nullptr,
         make_scoped_ptr(new typename Interface::ResponseValidator_())));
     proxy_.reset(new Proxy(endpoint_client_.get()));
+    proxy_->serialization_context()->router = endpoint_client_->router();
   }
 
   // After this method is called, the object is in an invalid state and