Merge "Return frame period from vsynctracker." into tm-dev am: 4d035493 am: 90f91173

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/17699150



Change-Id: I90ae5a73071592fa194b329c1ad6331921d55d6a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>