Enable screen capture support in getUserMedia()

Open "chrome://flags" in the latest chrome canary.

Scroll to the bottom of the page.

Enable flag "Enable screen capture support in getUserMedia()"

That flag allows web pages to request access to the screen contents via
the getUserMedia() API.

https://googledrive.com/host/0B6GWd_dUUTT8WHpWSzZ5S0RqeUk/Pluginfree-Screen-Sharing.html