Merge "Allow ACTIVITY_TYPE_RECENTS to have multiple root tasks" into main am: 7a0fa2c8e8 am: cfd7109247 am: 1743e689b7

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2804293

Change-Id: I4de93c878747f4853d40dc15085eae216a78a0e0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>