Merge changes Ie68f7538,I9e8410c6,I79ab3cbe,Iee05e39f into udc-dev

* changes:
  Create BubbleViewCallback for the bubble bar and use it
  Use BubbleBarLayerView & BubbleBarExpandedView
  Introduce BubbleBarLayerView & animation for BubbleBarExpandedView
  Introduce BubbleBarExpandedView