Merge "Allow linear backoff policy for UI jobs." into udc-dev am: 6aef66c9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22254666



Change-Id: I84e95becc7b08d60279c14b2a08b262fd7605f27
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>