Merge "Fix volume slider not showing when casting in the background" into...

Merge "Fix volume slider not showing when casting in the background" into udc-dev am: f96e49ed am: def3b29e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23726250



Change-Id: I0466b5049a3f6fe57be0ecc41756ab0643c65aac
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>