am fee5e3d3: am 50511096: am de9848c6: Merge "Initial changes to add callback on task stack changes. (Bug 17672056, Bug 18291345)" into lmp-mr1-dev

* commit 'fee5e3d32a26c3ac2136e37cad15fd9cc41066db':
  Initial changes to add callback on task stack changes. (Bug 17672056, Bug 18291345)