Merge "[Output Switcher] Add unmute function on volume icon" into udc-dev am:...

Merge "[Output Switcher] Add unmute function on volume icon" into udc-dev am: 528dfcfe am: 0a0f3eb1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22290782



Change-Id: Iab496748733bd6086538f4c478796bde0092019f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>