Merge "Feature flag for stylus battery notifications." into tm-qpr-dev am: 83af9f92

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20541586



Change-Id: Ic1df7c1e9b4df1f9fedd4609f97e5ebcb26cf00b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>