function resultCallback(error, payloads)
        {
            if (error) {
                userCallback(null);
                return;
            }
            userCallback(payloads.map(WebInspector.AnimationModel.AnimationPlayer.parsePayload.bind(null, this.target())));
        }
@param {?Protocol.Error} error
@param {!Array.<!AnimationAgent.AnimationPlayer>} payloads
@this {WebInspector.AnimationModel}