Why? Most old-school international airlines, and Air China qualifies, do provide STPC. However, a casual search of the website only pulls up this page about free transit hotels in Beijing, so you might need to call them up and ask about Shanghai:

http://www.airchina.co.uk/en/STPC.html

Even for PEK though, the conditions do say that the stop must be "overnight", so an 11-hour layover may be pushing it.