title: onLayout not being called
body: <p>This is an extract of my code:</p>
  
  <pre class="lang-js prettyprint-override"><code>render() {
      console.log("first log");
      return (
          &lt;View onLayout={e =&gt; console.log("second log")}&gt;
  ...
  </code></pre>
  
  <p>The console displays "first log" but not the second one. The view seems to render correctly. I tried with other views but the result is the same.
  I'm using react-native 0.48.4.</p>