function ruleResultReadyCallback(categoryResult, ruleResult)
        {
            if (ruleResult && ruleResult.children)
                categoryResult.addRuleResult(ruleResult);

            if (this._progress.isCanceled())
                this._progress.done();
        }
@param {!WebInspector.AuditCategoryResult} categoryResult
@param {!WebInspector.AuditRuleResult} ruleResult
@this {WebInspector.AuditController}