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

am: 174e1ace

* commit '174e1ace':
  Tweaking accessibility actions for dock divider.
  Ensure that the drag view is not dimmed.
  Disallowing scrim activity from setting TaskDescription.

Change-Id: I2609ab70154d9d833d090219a3b49ca9f2d80e89