Merge "Clear main looper before VolumeDialogImplTest" into udc-qpr-dev am: 0bfdd749 am: 92d84b20

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24815627



Change-Id: I265bde8683100a92283ae845aca271b39ad83bec
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>