am a8512a71: Always set the scheduling group when starting a new thread.

Merge commit 'a8512a71d3c2e3e67bbccf11251ed594d66f1f25' into gingerbread-plus-aosp

* commit 'a8512a71d3c2e3e67bbccf11251ed594d66f1f25':
  Always set the scheduling group when starting a new thread.