Reviewed by Eric Seidel.

        Add the html5lib HTML parser tests
        https://bugs.webkit.org/show_bug.cgi?id=39260

        We currently fail a bunch of these.  Hopefully we'll get better as we
        implement the HTML5 parser.

        Source: http://gsnedders.html5.org/html5lib-tests/runner.html

        * html5lib/resources/dom2string.js: Added.
        (String.prototype.toAsciiLowerCase):
        (indent):
        (dom2string):
        * html5lib/resources/tests1.dat: Added.
        * html5lib/resources/tests10.dat: Added.
        * html5lib/resources/tests11.dat: Added.
        * html5lib/resources/tests12.dat: Added.
        * html5lib/resources/tests13.dat: Added.
        * html5lib/resources/tests14.dat: Added.
        * html5lib/resources/tests15.dat: Added.
        * html5lib/resources/tests16.dat: Added.
        * html5lib/resources/tests2.dat: Added.
        * html5lib/resources/tests3.dat: Added.
        * html5lib/resources/tests4.dat: Added.
        * html5lib/resources/tests5.dat: Added.
        * html5lib/resources/tests6.dat: Added.
        * html5lib/resources/tests7.dat: Added.
        * html5lib/resources/tests8.dat: Added.
        * html5lib/resources/tests9.dat: Added.
        * html5lib/runner-expected.txt: Added.
        * html5lib/runner.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@59638 268f45cc-cd09-0410-ab3c-d52691b4dbfc