Merge changes Ie3125ec8,Ifa149322,Ifa2ed84a into nyc-dev

am: b77d0bcc

* commit 'b77d0bcc':
  Tweaking accessibility actions for dock divider.
  Ensure that the drag view is not dimmed.
  Disallowing scrim activity from setting TaskDescription.

Change-Id: I535255c12415caf02e30885fb4efc0efd04cdbc6