code: public com.google.iam.v1.BindingDelta.Action getAction() {
      com.google.iam.v1.BindingDelta.Action result = com.google.iam.v1.BindingDelta.Action.valueOf(action_);
      return result == null ? com.google.iam.v1.BindingDelta.Action.UNRECOGNIZED : result;
    }
docs: <pre>
  The action that was performed on a Binding.
  Required
  </pre>
  
  <code>.google.iam.v1.BindingDelta.Action action = 1;</code>