Merge "Add a field to BubbleInfo to indicate whether a bubble is important." into udc-dev am: 386848cb am: b505e9e3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23038443



Change-Id: Ia8c7fc03b42633609db1aef373b58986bfcbfa75
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>