message: Add missing command to SESSION_INDEPENDENT_COMMAND_TYPE_SET.
  This CL also adds LINT.IfChange / ThenChange.
diff: @@ -87,6 +87,7 @@ uint32_t GetDuration(uint64_t base_value) {
  bool IsSessionIndependentCommand(commands::Input::CommandType type) {
  switch (type) {
  + // LINT.IfChange(session_independent_command)
  case commands::Input::NO_OPERATION:
  case commands::Input::SET_CONFIG:
  case commands::Input::GET_CONFIG:
  @@ -96,6 +97,10 @@ bool IsSessionIndependentCommand(commands::Input::CommandType type) {
  case commands::Input::CLEAR_UNUSED_USER_PREDICTION:
  case commands::Input::RELOAD:
  case commands::Input::SEND_USER_DICTIONARY_COMMAND:
  + case commands::Input::SYNC_DATA:
  + case commands::Input::CHECK_SPELLING:
  + case commands::Input::SET_REQUEST:
  + // LINT.ThenChange()
  return true;
  default:
  return false;
  