Merge "Put activity-start into its own transition when recents collecting"...

Merge "Put activity-start into its own transition when recents collecting" into udc-dev am: 70941199 am: fdc300c7 am: 44c1be08

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22873334



Change-Id: If082e132516a1228baf5a147e98ebf60381f826f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>