code: private void processInheritsCall(Node n) {
      if (n.getChildCount() == 3) {
        Node subClass = n.getSecondChild();
        Node superClass = subClass.getNext();
        if (subClass.isUnscopedQualifiedName() && superClass.isUnscopedQualifiedName()) {
          knownClosureSubclasses.add(subClass.getQualifiedName());
        }
      }
    }
docs: Processes the goog.inherits call.