Merge "decouple Bubble from NotificationEntry" into rvc-dev am: 7fc567f7a3 am: 71bfeb52c3 am: 6f91c2cea5 am: 8ec7efabfe

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11668704

Change-Id: I721447261bc2ad31ac89ebe31f51f1a75fc9bb89