Merge "Add hidden API getDataSaverViaCmFlag() for CTS" into main am: eb33cf470d am: dbe057c6cf am: 343cb480fc

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2822810

Change-Id: Id08f51bc79410398dcf5103812de4572e902b2fd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>