Dismiss bubbles if shouldBubbleUp returns false (e.g. DND is enabled and...

Dismiss bubbles if shouldBubbleUp returns false (e.g. DND is enabled and configured to hide that bubble).

Bug: 159413312
Test: post a bubble, enable dnd, bubble goes away, disable DND, bubble is back!
Test: change DND settings from 'no sound' to 'no visual', bubble remains if 'no sound' is selected
Test: dismiss bubble, enable DND, disable DND, observe bubble does not re-appear since it was manually disabled
Change-Id: I8cb4b62d2cf272e9ac46f4088112a6dad381d40c