Merge "Refactor the buildTransitions into overridable functions" into udc-dev am: cf2e7655 am: 29ca9cb9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23508286



Change-Id: I4d1aa78d526ad9b4dfe85fa6d2f8fab5d26aedd7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>