am de9848c6: Merge "Initial changes to add callback on task stack changes. (Bug 17672056, Bug 18291345)" into lmp-mr1-dev

* commit 'de9848c641e1b1e0f73e5655c3f8c0c3b34a011c':
  Initial changes to add callback on task stack changes. (Bug 17672056, Bug 18291345)