Merge "gd HCI: assign client_handler_ before execute queued callbacks"

    ASSERT(client_callbacks_ == nullptr || queued_callbacks_.empty());

  }

  void RegisterCallbacks(ConnectionManagementCallbacks* callbacks, os::Handler* handler) {

    client_handler_ = handler;

    client_callbacks_ = callbacks;

    while (!queued_callbacks_.empty()) {

      auto iter = queued_callbacks_.begin();

      handler->Post(std::move(*iter));

      queued_callbacks_.erase(iter);

    }

    client_handler_ = handler;

    client_callbacks_ = callbacks;

  }

#define SAVE_OR_CALL(f, ...)                                                                                        \