Add logging for count of shown / hidden apps in Battery Usage page. am: 676bcedb am: 93c0d022

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/19893207



Change-Id: I8014b3155c6f731aa88133c718c986b09893723e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>