Merge "Check app idle states and inform listeners on power-save-wl change." into rvc-dev am: 9129418140 am: 0acff8fd77 am: 55727b13c9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12166806

Change-Id: I57986a43d158dfca1bf4e2eadee27b1a08a68ca8