r=sdagley a=chofmann. Add support for GetAttention API to nsIDOMWindow.
r=vidur, a=chofmann. To do, make call to WebShell from nsIDOMWindow,
this will come once travis lands some webshell code.
git-svn-id: svn://10.0.0.236/trunk@56140 18797224-902f-48f8-a5cc-f745e15eee43