Merge "Allow DiskRead ThreadPolicy in LetterboxConfigurationPersister" into udc-dev am: 99eba6f0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23750905



Change-Id: I1f42a83bbaddbf396dc858aac833eac1e1331bea
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>