Merge "cameraservice: Add metrics for extension sessions" into udc-dev am: 6ed5a696

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/22984741



Change-Id: Ibd36aa049c3331af46f92ecda9fe0c28c5c66293
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>