Merge "Add new api for showing media output switcher dialog." into tm-qpr-dev am: a2896db8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20911786



Change-Id: Icf0a6dad30cfc782565b1ef70eac1be232492fc5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>