message: rebased and updated TF_SetTracingImplementation for grad_check_test
diff: @@ -40,7 +40,10 @@ class GradientCheckerTest
  : public ::testing::TestWithParam<std::tuple<const char*, bool, bool>> {
  protected:
  void SetUp() override {
  - TF_SetTracingImplementation(std::get<0>(GetParam()));
  + TF_StatusPtr status(TF_NewStatus());
  + TF_SetTracingImplementation(std::get<0>(GetParam()), status.get());
  + Status s = StatusFromTF_Status(status.get());
  + CHECK_EQ(errors::OK, s.code()) << s.error_message();
  }
  };
  