Merge "[Panlingual] Add a flag to control opt-in/out" into tm-dev am: aaf91230

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18161842



Change-Id: I0a951bc0b4cf77d490e18999232a5677db38c180
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>