Merge "decouple Bubble from NotificationEntry" into rvc-dev am: 7fc567f7 am: 71bfeb52 am: 6f91c2ce

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

Change-Id: If3df1f8aebf012a10d5e9ac6e5639a04a7706d60