Merge "Camera: Use a single handler thread for device state callbacks" into...

Merge "Camera: Use a single handler thread for device state callbacks" into udc-dev am: 5f614202 am: 0f60f166

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21563739



Change-Id: I4b85f40cac7688061ea0f0aa09f2762c4fdf56f3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>