Tests that console logging dumps proper messages.

console-dirxml.js:19 #document (http://127.0.0.1:8000/devtools/resources/inspected-page.html)#top-layer
console-dirxml.js:20 #document-fragment
console-dirxml.js:21 <p></p>
console-dirxml.js:22 [p]
console-dirxml.js:23 (3) [document, document-fragment, span]