Bug 937960, part 1 - Add ICC pref to nsJSEnv. r=smaug
Bug 937960, part 2 - Add ICC slice timer and scheduling. r=smaug
Bug 937960, part 3 - Pass in a small time budget with ICC. r=smaug
Bug 937960, part 4 - Reduce time until CC when it is incremental. r=smaug