message: Add missing #include. tensorflow::FunctionDef only happens to be available in this header because it happens to be forward-declared in one of the other .proto.h headers, but it's not actually used there and will go away.
diff: @@ -20,6 +20,7 @@ limitations under the License.
  #include <vector>
  #include "tensorflow/core/framework/attr_value.pb.h"
  +#include "tensorflow/core/framework/function.pb.h"
  #include "tensorflow/core/framework/graph.pb.h"
  #include "tensorflow/core/framework/node_def.pb.h"
  #include "tensorflow/core/framework/types.pb.h"
  