message: Add logging to diagnose device properties parsing problem in Grappler.
diff: @@ -411,6 +411,11 @@ Costs OpLevelCostEstimator::PredictCostOfAnUnknownOp(
  Costs OpLevelCostEstimator::PredictOpCountBasedCost(
  double operations, const OpInfo& op_features) const {
  DeviceInfo device_perf = GetDeviceInfo(op_features.device());
  + if (device_perf.gigaops <= 0 || device_perf.gb_per_sec <= 0) {
  + VLOG(1) << "BAD DEVICE. Op:" << op_features.op()
  + << " device type:" << op_features.device().type()
  + << " device model:" << op_features.device().model();
  + }
  Costs::NanoSeconds compute_cost(std::ceil(operations / device_perf.gigaops));
  VLOG(1) << "Op:" << op_features.op() << " GOps:" << operations / 1e9
  