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

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



Change-Id: Iaf65dfd933ddc922a4a8174cd31a6c6825472691
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>