Ron Dong was only 2 years old when his Chinese American parents moved to Coronado, Calif., a change that had been possible only because of a Black couple who defied anti-Asian segregation to rent a house to his family.More than 80 years later, Ron and his younger brother, Lloyd Dong Jr., 81, are carrying on the legacy of that couple, Gus and Emma Thompson, by donating part of the proceeds from the sale of the Coronado house and an apartment complex next door to support Black college students at San Diego State University.The university said the brothers’ donation, which is expected to be…