Merge "decouple Bubble from NotificationEntry" into rvc-dev am: 7fc567f7a3 am: 2aab9277e0

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

Change-Id: I891b7ad469957ed4add6cf45bef5a4a054fb4631