It's actually coming. If you go to about:flags in chrome, there's a flag called "Enable experimental Encrypted Media Extensions on the video elements.".

* https://dvcs.w3.org/hg/html-media/raw-file/tip/encrypted-med...

* https://lists.webkit.org/pipermail/webkit-dev/2012-April/020...

* http://www.theregister.co.uk/2012/02/23/microsoft_google_net...