Set default frameTimelinesLength to 1 am: 9781fe9e10

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24447498

Change-Id: Ib4f46cbcf998ad39e4718d1417baf0da422ee24c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>