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: f1a32c19

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



Change-Id: I0302fe0f9fdc3f09f5b002602aaf03d05c23c4e1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>