Add missing proto import.
@@ -18,6 +18,7 @@ limitations under the License
#include <future> // NOLINT
#include <memory>
+#include "google/protobuf/repeated_field.h"
#include "absl/status/status.h"
#include "absl/synchronization/mutex.h"
#include "tensorflow_federated/cc/core/impl/executors/cardinalities.h"
