Merge changes Ie3125ec8,Ifa149322,Ifa2ed84a into nyc-dev am: b77d0bcc

am: e5c29212

* commit 'e5c29212':
  Tweaking accessibility actions for dock divider.
  Ensure that the drag view is not dimmed.
  Disallowing scrim activity from setting TaskDescription.

Change-Id: I71239d975064ec7fd9d03403c367a9267673f6e9