Utility methods used for dartium debugger integration.
In addition, added back two DOM methods required by the chrome dev tools that had been removed from dart:html
I'm not thrilled about adding back className but the devtools use className in 495 places so figuring out which places are actually talking about classNames of inspected objects and which ones are just internal uses of className inside the devtools would be a pain.
As the browser has a String "class" attribute I do think it is natural to provide at least a read only className in addition to classes.

This changes goes along with the larger CL
https://codereview.chromium.org/18169002/
which I will be sending out for general review in a little bit.

BUG=
R=blois@google.com

Committed: https://code.google.com/p/dart/source/detail?r=25032

Review URL: https://codereview.chromium.org//18125007

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28904 260f80e4-7a28-3924-810f-c04153c831b5
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