Merge "Add Fragment#onAttachFragment for parent fragments" into nyc-dev
am: a6c0cc0992

* commit 'a6c0cc099221a5321505b1343f623e76f52b2ad5':
  Add Fragment#onAttachFragment for parent fragments

Change-Id: I9138e3ee5706cbd35a119843f0007f548021e2f9