Merge "Trigger background memory trim when SystemUI is idle" into udc-dev am:...

Merge "Trigger background memory trim when SystemUI is idle" into udc-dev am: d516a7ca am: b8d53e24

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23130319



Change-Id: I4626343079e3d91e3f520669d2706795121dbf9c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>