[perf-test] Add a benchmark of querySelector() for an element that appears in the...

[perf-test] Add a benchmark of querySelector() for an element that appears in the depths in the document
https://bugs.webkit.org/show_bug.cgi?id=88202

Reviewed by Ryosuke Niwa.

query-selector-first.html tests querySelector() for an element
that appears at the head of the document. query-selector-last.html
tests querySelector() for an element that appears at the tail of
the document. In addition, we want a benchmark of querySelector()
for an element that appears in the depths in the document.

Test results in my Linux desktop:

RESULT Parser: query-selector-deep= 460.776980611 runs/s
median= 460.947503201 runs/s, stdev= 1.72274941942 runs/s, min= 455.696202532 runs/s, max= 463.32046332 runs/s

RESULT Parser: query-selector-deep= 458.925050915 runs/s
median= 459.183673469 runs/s, stdev= 1.47930124139 runs/s, min= 454.545454545 runs/s, max= 460.947503201 runs/s

RESULT Parser: query-selector-deep= 461.866981491 runs/s
median= 461.538461538 runs/s, stdev= 1.14613123359 runs/s, min= 459.183673469 runs/s, max= 463.917525773 runs/s

RESULT Parser: query-selector-deep= 453.922010788 runs/s
median= 454.258855898 runs/s, stdev= 1.77279123317 runs/s, min= 447.204968944 runs/s, max= 455.696202532 runs/s

RESULT Parser: query-selector-deep= 454.666321221 runs/s
median= 454.545454545 runs/s, stdev= 1.65775667417 runs/s, min= 451.127819549 runs/s, max= 456.852791878 runs/s

* Parser/query-selector-deep.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@119368 268f45cc-cd09-0410-ab3c-d52691b4dbfc