Merge "Check app idle states and inform listeners on power-save-wl change."...

Merge "Check app idle states and inform listeners on power-save-wl change." into rvc-dev am: 91294181 am: 0acff8fd am: 14e1049c am: caeb18b2

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

Change-Id: I77bb7e331dff5d7357b9b1a45537787f8f116a9c