JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"></script>
<div class="container">
    <div class="well col-xs-4">texto</div>
    <div class="well col-xs-4">mais texto que o texto</div>
    <div class="well col-xs-4">3</div>
    <div class="well col-xs-4">texto</div>
    <div class="well col-xs-4">bué da mais texto que o texto do texto</div>
    <div class="well col-xs-4">6</div>
    <div class="well col-xs-4">7</div>
    <div class="well col-xs-4">8</div>
</div>

JavaScript

var divs = $(".container > div");
for (var i = 0; i < divs.length; i += 3) {
    divs.slice(i, i + 3).wrapAll("<div class='row'></div>");
}