Merge "Skip legacy BackgroundDexOptService unit tests when ART Service is in use." into udc-dev am: b234b657a1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22163313

Change-Id: I83eb4b7462c7f864bc6a62b7afb3f3ae62b5d011
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>