Merge "Guard regionSampler registering/deregistering code behind the flag." into tm-qpr-dev am: b46daaa705

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20599863

Change-Id: I4a78f3db753a76a7cafed6dc118ea6a843b40b20
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>