And inform listeners when the bucket changes, not just when going in and out of RARE bucket. Avoid redundant callbacks when informing listeners. Bug: 63527785 Test: runtest -x frameworks/base/services/tests/servicestests/src/com/android/server/usage/AppStandbyControllerTests.java Change-Id: Icd98d59f597147fbf8ea4bf44edf4b3b3d5c8e14