Keep the screen on while the test activity is on top. am: d1affb65da

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2103744

Change-Id: I99847c43a08d91cfef083c899a2914967ec9d09e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>