Merge "Allow linear backoff policy for UI jobs." into udc-dev am: 6aef66c9 am: ff50f733

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



Change-Id: Ib81a5b0baae055f2b8c0cdd72448b1157203d2b9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>