Merge "Make TransitionController's helper handle start and queue" into udc-dev am: d3cfcfdd

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22583708



Change-Id: I848fa67b14936de0f524218c6dce4777195dfcbe
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>