am 360fba54: Update sdk.atree with new ant rules location.
Update fragment samples to show back stacks and layout.

Change-Id: I016f87dc3b7433d0600a9a9308f666a36c5a98ca
Merge commit 'd2d93d0b172770145ab4fa320029ede1d6c846f8' into oxygen_4.3

* commit 'd2d93d0b172770145ab4fa320029ede1d6c846f8':
  Update fragment samples to show back stacks and layout.