Merge "Use frameTimelinesLength instead of const" into udc-dev am: c5063521 am: 8ddd3c19 am: e92588ab

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/22869417



Change-Id: Ib2db2e22dd8a14ddad72c828ba09aa6d65074ce9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>