Reviewed by Eric Seidel.

        Parse attributes with HTML5 lexer
        https://bugs.webkit.org/show_bug.cgi?id=39520

        This patch lets the HTML5 lexer parse attributes, as in
        <div attr="foo"></div>.  This patch is on the critical path to running
        the html5lib tests.

        * html/HTML5Lexer.cpp:
        (WebCore::HTML5Lexer::nextToken):
        * html/HTML5Lexer.h:
        * html/HTML5Token.h:
        (WebCore::HTML5Token::beginStartTag):
        (WebCore::HTML5Token::beginEndTag):
        (WebCore::HTML5Token::addNewAttribute):
        (WebCore::HTML5Token::appendToAttributeName):
        (WebCore::HTML5Token::appendToAttributeValue):
        (WebCore::HTML5Token::attributes):
        * html/HTML5Tokenizer.cpp:
        (WebCore::convertToOldStyle):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@60001 268f45cc-cd09-0410-ab3c-d52691b4dbfc