Merge changes I61bfb975,I2cb907c5,I13c60b3b into tm-qpr-dev

* changes:
  [Media TTT] Animate the sender chip out.
  [Chipbar] Define #shouldIgnoreViewRemoval as a specific API on the TemporaryViewDisplayController, instead of having subclasses just override #removeView.
  [Media TTT] Add the background back to the receiver chip.