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: 962b2744 am: 6b29a0bd

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



Change-Id: Ie25cddb1f0e219b3e5e6b4ec3613fdecf6b5ee2c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>