Merge "Use frameTimelinesLength instead of const" into udc-dev am: c5063521 am: 89bde671 am: 2c4f74c7

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



Change-Id: Ice53f9ef89ccb38bf17bd27019c1701319def217
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>