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

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



Change-Id: I01dcbfe3a0059d8c723dd3f87177f15c186cb02b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>