- dart2js version uses Element.classList (DomTokenList) for 4x speedup.
- Fix bug where document.querySelectorAll(...).classes.add('x') fails for SVG elements.
- Add test for above.
For later:
- Identify a polyfill for IE SVGElements (they don't have classList)
- Simplify CssClassSet further to exploit uniform availability of classList. This should give another performance boost by enabling inlining.
R=alanknight@google.com
Review URL: https://codereview.chromium.org//1054863002
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44888 260f80e4-7a28-3924-810f-c04153c831b5