Bug 990812 - Allow a deeper frame message manager hierarchy than only global > window > tab r=smaug
Bug 990812 - Add nsIDOMChromeWindow.getGroupMessageManager() API r=smaug
Bug 990812 - Let the frame loader use a group message manager as the parent when it detects that a frame belongs to a certain group r=smaug
Bug 990812 - Tests for group message managers r=smaug
Bug 990812 - Make a11y jsat utils handle group message managers r=yzen