code: public java.lang.String getRole() {
      java.lang.Object ref = role_;
      if (ref instanceof java.lang.String) {
        return (java.lang.String) ref;
      } else {
        com.google.protobuf.ByteString bs = 
            (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        role_ = s;
        return s;
      }
    }
docs: <pre>
  Role that is assigned to `members`.
  For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
  Required
  </pre>
  
  <code>string role = 1;</code>