am ef16a545: Merge change I2867746d into eclair

Merge commit 'ef16a545dca8deacdcdd89cb493d556adf7a8be8' into eclair-mr2

* commit 'ef16a545dca8deacdcdd89cb493d556adf7a8be8':
  When a thread is about to be put back onto the thread pool ensure that it is in the foreground cgroup.