Dump finish time of transitions in transitions trace am: 61aaf12c am: 4a672625

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



Change-Id: Ib78c5b926b3e14f457f7e2282c9f3b38c4c0af1e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>