Dump finish time of transitions in transitions trace am: 61aaf12c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21609946



Change-Id: I8f6ee260a6f54ab512e5e5984a317cf780009e36
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>