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

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



Change-Id: I3fc78eaaf2a4b83e4e8818b1302fdac5422a052b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>