A Miami jury found the makers of Chinese drywall responsible for damaging a Coconut Grove couple’s house, awarding Jeffrey and Elisa Robin $1.1 million for the faulty building material. The verdict, issued Friday night in Miami-Dade Circuit Court, marks the first time a jury has ruled in a case involving all the defendants in the distribution chain behind the drywall that is the subject of litigation across the country, said the Robins’ attorney, Victor Diaz.