Merge "Add a callback for rendernode parentcount=0" into nyc-dev
am: bbb4c2e

* commit 'bbb4c2eb2e871977289a9c48f414962e46b56ddc':
  Add a callback for rendernode parentcount=0

Change-Id: I8168b028ce61413da8ecea76e6531c5dde9ddb46