SerializePartialToString  253 third_party/protobuf/python/google/protobuf/pyext/python-proto2.cc   CMETHOD(SerializePartialToString, METH_VARARGS,
SerializePartialToString 1304 third_party/protobuf/python/google/protobuf/pyext/python-proto2.cc   self->message->SerializePartialToString(&contents);
SerializePartialToString  187 third_party/protobuf/src/google/protobuf/message_lite.h   bool SerializePartialToString(string* output) const;