Reviewed by Eric Seidel.

        Make HTML5 parser parse <script>alert("<hi>");</script>
        https://bugs.webkit.org/show_bug.cgi?id=39525

        More progress towards getting the html5lib test harness running.  We
        need to parse script data in the ScriptDataState.  The spec says the
        parser should set the lexer's state to ScriptDataState, but we want to
        keep using the existing parser for a while so I've added some temporary
        logic to HTML5Tokenizer to set the state in the lexer.

        To get this case running, I needed to flesh out a bunch of the
        ScriptDataState logic.  There's a bunch more to do, but this is a
        start.

        I'm not 100% happy with this patch, but it lets us execute a simplified
        version of the test harness up to the point where it starts running the
        first test.

        * html/HTML5Lexer.cpp:
        (WebCore::HTML5Lexer::nextToken):
        (WebCore::HTML5Lexer::isAppropriateEndTag):
        (WebCore::HTML5Lexer::emitCurrentTagToken):
        * html/HTML5Lexer.h:
        (WebCore::HTML5Lexer::setState):
        * html/HTML5Token.h:
        (WebCore::HTML5Token::beginEndTag):
        (WebCore::HTML5Token::appendToCharacter):
        (WebCore::HTML5Token::name):
        * html/HTML5Tokenizer.cpp:
        (WebCore::HTML5Tokenizer::write):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@60047 268f45cc-cd09-0410-ab3c-d52691b4dbfc