Reviewed by David Hyatt.

        Change the API of nextToken to distinguish between emitting a token and just running out of input
        https://bugs.webkit.org/show_bug.cgi?id=39349

        I'm not sure there's a functional difference with this patch yet, but
        as discussed with Eric, we need this to handle attributes.

        * html/HTML5Lexer.cpp:
        (WebCore::HTML5Lexer::reset):
        (WebCore::HTML5Lexer::nextToken):
        * html/HTML5Lexer.h:
        * html/HTML5Token.h:
        (WebCore::HTML5Token::HTML5Token):
        (WebCore::HTML5Token::clear):
        (WebCore::HTML5Token::beginStartTag):
        (WebCore::HTML5Token::beginEndTag):
        (WebCore::HTML5Token::beginCharacter):
        * html/HTML5Tokenizer.cpp:
        (WebCore::HTML5Tokenizer::write):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@59750 268f45cc-cd09-0410-ab3c-d52691b4dbfc