Merge "decouple Bubble from NotificationEntry" into rvc-dev am: 7fc567f7a3 am: 2aab9277e0 am: 9af65ebb9e

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

Change-Id: I511b1695272b8efab951264b4770122bbaa3da73