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