Merge "[Output Switcher] Use Thread-safe list to store mediaDevices in...

Merge "[Output Switcher] Use Thread-safe list to store mediaDevices in MediaManager" into tm-dev am: 82c3268c am: 84612594

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18911999



Change-Id: I379bfaf61110d831a031eb98e88fff2ebb0a87e9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>