[css-cascade] Environment encoding for @import

Hi,


I just added the concept of "environment encoding" to CSS Syntax, and
defined it there for @import:

http://dev.w3.org/csswg/css-syntax/#environment-encoding
http://dev.w3.org/csswg/css-syntax/#environment-encoding-at-import

It would make sense to move this to css-cascade where @import is 
defined, but is it possible without sending css-cascade back to LC from CR?

-- 
Simon Sapin